1 /*
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24 */
25
26 #if 0
27 CHANGES - changes for libpng
28
29 version 0.1 [March 29, 1995]
30 initial work-in-progress release
31
32 version 0.2 [April 1, 1995]
33 added reader into png.h
34 fixed small problems in stub file
35
36 version 0.3 [April 8, 1995]
37 added pull reader
38 split up pngwrite.c to several files
39 added pnglib.txt
40 added example.c
41 cleaned up writer, adding a few new transformations
42 fixed some bugs in writer
43 interfaced with zlib 0.5
44 added K&R support
45 added check for 64 KB blocks for 16 bit machines
46
47 version 0.4 [April 26, 1995]
48 cleaned up code and commented code
49 simplified time handling into png_time
50 created png_color_16 and png_color_8 to handle color needs
51 cleaned up color type defines
52 fixed various bugs
53 made various names more consistent
54 interfaced with zlib 0.71
55 cleaned up zTXt reader and writer (using zlib's Reset functions)
56 split transformations into pngrtran.c and pngwtran.c
57
58 version 0.5 [April 30, 1995]
59 interfaced with zlib 0.8
60 fixed many reading and writing bugs
61 saved using 3 spaces instead of tabs
62
63 version 0.6 [May 1, 1995]
64 first beta release
65 added png_large_malloc() and png_large_free()
66 added png_size_t
67 cleaned up some compiler warnings
68 added png_start_read_image()
69
70 version 0.7 [June 24, 1995]
71 cleaned up lots of bugs
72 finished dithering and other stuff
73 added test program
74 changed name from pnglib to libpng
75
76 version 0.71 [June 26, 1995]
77 changed pngtest.png for zlib 0.93
78 fixed error in libpng.txt and example.c
79
80 version 0.8 [August 20, 1995]
81 cleaned up some bugs
82 added png_set_filler()
83 split up pngstub.c into pngmem.c, pngio.c, and pngerror.c
84 added #define's to remove unwanted code
85 moved png_info_init() to png.c
86 added old_size into png_realloc()
87 added functions to manually set filtering and compression info
88 changed compression parameters based on image type
89 optimized filter selection code
90 added version info
91 changed external functions passing floats to doubles (k&r problems?)
92 put all the configurable stuff in pngconf.h
93 enabled png_set_shift to work with paletted images on read
94 added png_read_update_info() - updates info structure with transformations
95
96 Version 0.81 [August, 1995]
97 incorporated Tim Wegner's medium model code (thanks, Tim)
98
99 Version 0.82 [September, 1995]
100 [unspecified changes]
101
102 Version 0.85 [December, 1995]
103 added more medium model code (almost everything's a far)
104 added i/o, error, and memory callback functions
105 fixed some bugs (16-bit, 4-bit interlaced, etc.)
106 added first run progressive reader (barely tested)
107
108 Version 0.86 [January, 1996]
109 fixed bugs
110 improved documentation
111
112 Version 0.87 [January, 1996]
113 fixed medium model bugs
114 fixed other bugs introduced in 0.85 and 0.86
115 added some minor documentation
116
117 Version 0.88 [January, 1996]
118 fixed progressive bugs
119 replaced tabs with spaces
120 cleaned up documentation
121 added callbacks for read/write and warning/error functions
122
123 Version 0.89 [June 5, 1996]
124 Added new initialization API to make libpng work better with shared libs
125 we now have png_create_read_struct(), png_create_write_struct(),
126 png_create_info_struct(), png_destroy_read_struct(), and
127 png_destroy_write_struct() instead of the separate calls to
128 malloc and png_read_init(), png_info_init(), and png_write_init()
129 Changed warning/error callback functions to fix bug - this means you
130 should use the new initialization API if you were using the old
131 png_set_message_fn() calls, and that the old API no longer exists
132 so that people are aware that they need to change their code
133 Changed filter selection API to allow selection of multiple filters
134 since it didn't work in previous versions of libpng anyways
135 Optimized filter selection code
136 Fixed png_set_background() to allow using an arbitrary RGB color for
137 paletted images
138 Fixed gamma and background correction for paletted images, so
139 png_correct_palette is not needed unless you are correcting an
140 external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED
141 in pngconf.h) - if nobody uses this, it may disappear in the future.
142 Fixed bug with Borland 64K memory allocation (Alexander Lehmann)
143 Fixed bug in interlace handling (Smarasderagd, I think)
144 Added more error checking for writing and image to reduce invalid files
145 Separated read and write functions so that they won't both be linked
146 into a binary when only reading or writing functionality is used
147 New pngtest image also has interlacing and zTXt
148 Updated documentation to reflect new API
149
150 Version 0.89c [June 17, 1996]
151 Bug fixes.
152
153 Version 0.90 [January, 1997]
154 Made CRC errors/warnings on critical and ancillary chunks configurable
155 libpng will use the zlib CRC routines by (compile-time) default
156 Changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)
157 Added external C++ wrapper statements to png.h (Gilles Dauphin)
158 Allow PNG file to be read when some or all of file signature has already
159 been read from the beginning of the stream. ****This affects the size
160 of info_struct and invalidates all programs that use a shared libpng****
161 Fixed png_filler() declarations
162 Fixed? background color conversions
163 Fixed order of error function pointers to match documentation
164 Current chunk name is now available in png_struct to reduce the number
165 of nearly identical error messages (will simplify multi-lingual
166 support when available)
167 Try to get ready for unknown-chunk callback functions:
168 - previously read critical chunks are flagged, so the chunk handling
169 routines can determine if the chunk is in the right place
170 - all chunk handling routines have the same prototypes, so we will
171 be able to handle all chunks via a callback mechanism
172 Try to fix Linux "setjmp" buffer size problems
173 Removed png_large_malloc, png_large_free, and png_realloc functions.
174
175 Version 0.95 [March, 1997]
176 Fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
177 Fixed bug in PNG file signature compares when start != 0
178 Changed parameter type of png_set_filler(...filler...) from png_byte
179 to png_uint_32
180 Added test for MACOS to ensure that both math.h and fp.h are not #included
181 Added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)
182 Added "packswap" transformation, which changes the endianness of
183 packed-pixel bytes (Kevin Bracey)
184 Added "strip_alpha" transformation, which removes the alpha channel of
185 input images without using it (not necessarily a good idea)
186 Added "swap_alpha" transformation, which puts the alpha channel in front
187 of the color bytes instead of after
188 Removed all implicit variable tests which assume NULL == 0 (I think)
189 Changed several variables to "png_size_t" to show 16/32-bit limitations
190 Added new pCAL chunk read/write support
191 Added experimental filter selection weighting (Greg Roelofs)
192 Removed old png_set_rgbx() and png_set_xrgb() functions that have been
193 obsolete for about 2 years now (use png_set_filler() instead)
194 Added macros to read 16- and 32-bit ints directly from buffer, to be
195 used only on those systems that support it (namely PowerPC and 680x0)
196 With some testing, this may become the default for MACOS/PPC systems.
197 Only calculate CRC on data if we are going to use it
198 Added macros for zTXt compression type PNG_zTXt_COMPRESSION_???
199 Added macros for simple libpng debugging output selectable at compile time
200 Removed PNG_READ_END_MODE in progressive reader (Smarasderagd)
201 More description of info_struct in libpng.txt and png.h
202 More instructions in example.c
203 More chunk types tested in pngtest.c
204 Renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
205 png_set_<chunk>. We now have corresponding png_get_<chunk>
206 functions in pngget.c to get information in info_ptr. This isolates
207 the application from the internal organization of png_info_struct
208 (good for shared library implementations).
209
210 Version 0.96 [May, 1997]
211 Fixed serious bug with < 8bpp images introduced in 0.95
212 Fixed 256-color transparency bug (Greg Roelofs)
213 Fixed up documentation (Greg Roelofs, Laszlo Nyul)
214 Fixed "error" in pngconf.h for Linux setjmp() behavior
215 Fixed DOS medium model support (Tim Wegner)
216 Fixed png_check_keyword() for case with error in static string text
217 Added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
218 Added typecasts to quiet compiler errors
219 Added more debugging info
220
221 Version 0.97 [January, 1998]
222 Removed PNG_USE_OWN_CRC capability
223 Relocated png_set_crc_action from pngrutil.c to pngrtran.c
224 Fixed typecasts of "new_key", etc. (Andreas Dilger)
225 Added RFC 1152 [sic] date support
226 Fixed bug in gamma handling of 4-bit grayscale
227 Added 2-bit grayscale gamma handling (Glenn R-P)
228 Added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P)
229 Minor corrections in libpng.txt
230 Added simple sRGB support (Glenn R-P)
231 Easier conditional compiling, e.g.,
232 define PNG_READ/WRITE_NOT_FULLY_SUPPORTED;
233 all configurable options can be selected from command-line instead
234 of having to edit pngconf.h (Glenn R-P)
235 Fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P)
236 Added more conditions for png_do_background, to avoid changing
237 black pixels to background when a background is supplied and
238 no pixels are transparent
239 Repaired PNG_NO_STDIO behavior
240 Tested NODIV support and made it default behavior (Greg Roelofs)
241 Added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler)
242 Regularized version numbering scheme and bumped shared-library major
243 version number to 2 to avoid problems with libpng 0.89 apps
244 (Greg Roelofs)
245
246 Version 0.98 [January, 1998]
247 Cleaned up some typos in libpng.txt and in code documentation
248 Fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler)
249 Cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c
250 Changed recommendation about file_gamma for PC images to .51 from .45,
251 in example.c and libpng.txt, added comments to distinguish between
252 screen_gamma, viewing_gamma, and display_gamma.
253 Changed all references to RFC1152 to read RFC1123 and changed the
254 PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED
255 Added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)
256 Changed srgb_intent from png_byte to int to avoid compiler bugs
257
258 Version 0.99 [January 30, 1998]
259 Free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)
260 Fixed a longstanding "packswap" bug in pngtrans.c
261 Fixed some inconsistencies in pngconf.h that prevented compiling with
262 PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined
263 Fixed some typos and made other minor rearrangement of libpng.txt (Andreas)
264 Changed recommendation about file_gamma for PC images to .50 from .51 in
265 example.c and libpng.txt, and changed file_gamma for sRGB images to .45
266 Added a number of functions to access information from the png structure
267 png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)
268 Added TARGET_MACOS similar to zlib-1.0.8
269 Define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
270 Added type casting to all png_malloc() function calls
271
272 Version 0.99a [January 31, 1998]
273 Added type casts and parentheses to all returns that return a value.(Tim W.)
274
275 Version 0.99b [February 4, 1998]
276 Added type cast png_uint_32 on malloc function calls where needed.
277 Changed type of num_hist from png_uint_32 to int (same as num_palette).
278 Added checks for rowbytes overflow, in case png_size_t is less than 32 bits.
279 Renamed makefile.elf to makefile.lnx.
280
281 Version 0.99c [February 7, 1998]
282 More type casting. Removed erroneous overflow test in pngmem.c.
283 Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes.
284 Added UNIX manual pages libpng.3 (incorporating libpng.txt) and png.5.
285
286 Version 0.99d [February 11, 1998]
287 Renamed "far_to_near()" "png_far_to_near()"
288 Revised libpng.3
289 Version 99c "buffered" operations didn't work as intended. Replaced them
290 with png_memcpy_check() and png_memset_check().
291 Added many "if (png_ptr == NULL) return" to quell compiler warnings about
292 unused png_ptr, mostly in pngget.c and pngset.c.
293 Check for overlength tRNS chunk present when indexed-color PLTE is read.
294 Cleaned up spelling errors in libpng.3/libpng.txt
295 Corrected a problem with png_get_tRNS() which returned undefined trans array
296
297 Version 0.99e [February 28, 1998]
298 Corrected png_get_tRNS() again.
299 Add parentheses for easier reading of pngget.c, fixed "||" should be "&&".
300 Touched up example.c to make more of it compileable, although the entire
301 file still can't be compiled (Willem van Schaik)
302 Fixed a bug in png_do_shift() (Bryan Tsai)
303 Added a space in png.h prototype for png_write_chunk_start()
304 Replaced pngtest.png with one created with zlib 1.1.1
305 Changed pngtest to report PASS even when file size is different (Jean-loup G.)
306 Corrected some logic errors in png_do_invert_alpha() (Chris Patterson)
307
308 Version 0.99f [March 5, 1998]
309 Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey)
310 Moved makefiles into a "scripts" directory, and added INSTALL instruction file
311 Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok)
312 Added pointers to "note on libpng versions" in makefile.lnx and README
313 Added row callback feature when reading and writing nonprogressive rows
314 and added a test of this feature in pngtest.c
315 Added user transform callbacks, with test of the feature in pngtest.c
316
317 Version 0.99g [March 6, 1998, morning]
318 Minor changes to pngtest.c to suppress compiler warnings.
319 Removed "beta" language from documentation.
320
321 Version 0.99h [March 6, 1998, evening]
322 Minor changes to previous minor changes to pngtest.c
323 Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
324 and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
325 Added user transform capability
326
327 Version 1.00 [March 7, 1998]
328 Changed several typedefs in pngrutil.c
329 Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
330 Replaced "while(1)" with "for(;;)"
331 Added PNGARG() to prototypes in pngtest.c and removed some prototypes
332 Updated some of the makefiles (Tom Lane)
333 Changed some typedefs (s_start, etc.) in pngrutil.c
334 Fixed dimensions of "short_months" array in pngwrite.c
335 Replaced ansi2knr.c with the one from jpeg-v6
336
337 Version 1.0.0 [March 8, 1998]
338 Changed name from 1.00 to 1.0.0 (Adam Costello)
339 Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert)
340
341 Version 1.0.0a [March 9, 1998]
342 Fixed three bugs in pngrtran.c to make gamma+background handling consistent
343 (Greg Roelofs)
344 Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz
345 for major, minor, and bugfix releases. This is 10001. (Adam Costello,
346 Tom Lane)
347 Make months range from 1-12 in png_convert_to_rfc1123
348
349 Version 1.0.0b [March 13, 1998]
350 Quieted compiler complaints about two empty "for" loops in pngrutil.c
351 Minor changes to makefile.s2x
352 Removed #ifdef/#endif around a png_free() in pngread.c
353
354 Version 1.0.1 [March 14, 1998]
355 Changed makefile.s2x to reduce security risk of using a relative pathname
356 Fixed some typos in the documentation (Greg).
357 Fixed a problem with value of "channels" returned by png_read_update_info()
358
359 Version 1.0.1a [April 21, 1998]
360 Optimized Paeth calculations by replacing abs() function calls with intrinsics
361 plus other loop optimizations. Improves avg decoding speed by about 20%.
362 Commented out i386istic "align" compiler flags in makefile.lnx.
363 Reduced the default warning level in some makefiles, to make them consistent.
364 Removed references to IJG and JPEG in the ansi2knr.c copyright statement.
365 Fixed a bug in png_do_strip_filler with XXRRGGBB => RRGGBB transformation.
366 Added grayscale and 16-bit capability to png_do_read_filler().
367 Fixed a bug in pngset.c, introduced in version 0.99c, that sets rowbytes
368 too large when writing an image with bit_depth < 8 (Bob Dellaca).
369 Corrected some bugs in the experimental weighted filtering heuristics.
370 Moved a misplaced pngrutil code block that truncates tRNS if it has more
371 than num_palette entries -- test was done before num_palette was defined.
372 Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).
373 Changed compiler flags in makefile.wat for better optimization
374 (Pawel Mrochen).
375
376 Version 1.0.1b [May 2, 1998]
377 Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).
378 Relocated the png_composite macros from pngrtran.c to png.h (Greg).
379 Added makefile.sco (contributed by Mike Hopkirk).
380 Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a.
381 Fixed a bug in pngrtran.c that would set channels=5 under some circumstances.
382 More work on the Paeth-filtering, achieving imperceptible speedup
383 (A Kleinert).
384 More work on loop optimization which may help when compiled with C++
385 compilers.
386 Added warnings when people try to use transforms they've defined out.
387 Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.
388 Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)
389
390 Version 1.0.1c [May 11, 1998]
391 Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for
392 filler bytes should have been 0xff instead of 0xf.
393 Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.
394 Moved PNG_WRITE_WEIGHTED_FILTER_SUPPORTED and PNG_WRITE_FLUSH_SUPPORTED
395 out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h
396 Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED,
397 for consistency, in pngconf.h
398 Added individual "ifndef PNG_NO_[CAPABILITY]" in pngconf.h to make it easier
399 to remove unwanted capabilities via the compile line
400 Made some corrections to grammar (which, it's) in documentation (Greg).
401 Corrected example.c, use of row_pointers in png_write_image().
402
403 Version 1.0.1d [May 24, 1998]
404 Corrected several statements that used side effects illegally in pngrutil.c
405 and pngtrans.c, that were introduced in version 1.0.1b
406 Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert)
407 More corrections to example.c, use of row_pointers in png_write_image()
408 and png_read_rows().
409 Added pngdll.mak and pngdef.pas to scripts directory, contributed by
410 Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5
411 Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)
412 Changed several loops from count-down to count-up, for consistency.
413
414 Version 1.0.1e [June 6, 1998]
415 Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and
416 added warnings when people try to set png_read_fn and png_write_fn in
417 the same structure.
418 Added a test such that png_do_gamma will be done when num_trans==0
419 for truecolor images that have defined a background. This corrects an
420 error that was introduced in libpng-0.90 that can cause gamma processing
421 to be skipped.
422 Added tests in png.h to include "trans" and "trans_values" in structures
423 when PNG_READ_BACKGROUND_SUPPORTED or PNG_READ_EXPAND_SUPPORTED is defined.
424 Add png_free(png_ptr->time_buffer) in png_destroy_read_struct()
425 Moved png_convert_to_rfc_1123() from pngwrite.c to png.c
426 Added capability for user-provided malloc_fn() and free_fn() functions,
427 and revised pngtest.c to demonstrate their use, replacing the
428 PNGTEST_DEBUG_MEM feature.
429 Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
430
431 Version 1.0.2 [June 14, 1998]
432 Fixed two bugs in makefile.bor .
433
434 Version 1.0.2a [December 30, 1998]
435 Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
436 Fixed a bug in png_do_filler() that made it fail to write filler bytes in
437 the left-most pixel of each row (Kevin Bracey).
438 Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
439 in pngtest.c (Duncan Simpson).
440 Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
441 even when no tIME chunk was present in the source file.
442 Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
443 Fixed a problem in png_read_push_finish_row(), which would not skip some
444 passes that it should skip, for images that are less than 3 pixels high.
445 Interchanged the order of calls to png_do_swap() and png_do_shift()
446 in pngwtran.c (John Cromer).
447 Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
448 Changed "bad adaptive filter type" from error to warning in pngrutil.c .
449 Fixed a documentation error about default filtering with 8-bit indexed-color.
450 Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
451 (L. Peter Deutsch).
452 Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
453 Added png_get_copyright() and png_get_header_version() functions.
454 Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
455 Added information about debugging in libpng.txt and libpng.3 .
456 Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and
457 makefile.sco.
458 Removed lines after Dynamic Dependencies" in makefile.aco .
459 Revised makefile.dec to make a shared library (Jeremie Petit).
460 Removed trailing blanks from all files.
461
462 Version 1.0.2a [January 6, 1999]
463 Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
464 Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
465 Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
466 Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
467 which is obsolete.
468
469 Version 1.0.3 [January 14, 1999]
470 Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
471 Added a statement of Y2K compliance in png.h, libpng.3, and Y2KINFO.
472
473 Version 1.0.3a [August 12, 1999]
474 Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning
475 if an attempt is made to read an interlaced image when it's not supported.
476 Added check if png_ptr->trans is defined before freeing it in pngread.c
477 Modified the Y2K statement to include versions back to version 0.71
478 Fixed a bug in the check for valid IHDR bit_depth/color_types in pngrutil.c
479 Modified makefile.wat (added -zp8 flag, ".symbolic", changed some comments)
480 Replaced leading blanks with tab characters in makefile.hux
481 Changed "dworkin.wustl.edu" to "ccrc.wustl.edu" in various documents.
482 Changed (float)red and (float)green to (double)red, (double)green
483 in png_set_rgb_to_gray() to avoid "promotion" problems in AIX.
484 Fixed a bug in pngconf.h that omitted <stdio.h> when PNG_DEBUG==0 (K Bracey).
485 Reformatted libpng.3 and libpngpf.3 with proper fonts (script by J. vanZandt).
486 Updated documentation to refer to the PNG-1.2 specification.
487 Removed ansi2knr.c and left pointers to the latest source for ansi2knr.c
488 in makefile.knr, INSTALL, and README (L. Peter Deutsch)
489 Fixed bugs in calculation of the length of rowbytes when adding alpha
490 channels to 16-bit images, in pngrtran.c (Chris Nokleberg)
491 Added function png_set_user_transform_info() to store user_transform_ptr,
492 user_depth, and user_channels into the png_struct, and a function
493 png_get_user_transform_ptr() to retrieve the pointer (Chris Nokleberg)
494 Added function png_set_empty_plte_permitted() to make libpng useable
495 in MNG applications.
496 Corrected the typedef for png_free_ptr in png.h (Jesse Jones).
497 Correct gamma with srgb is 45455 instead of 45000 in pngrutil.c, to be
498 consistent with PNG-1.2, and allow variance of 500 before complaining.
499 Added assembler code contributed by Intel in file pngvcrd.c and modified
500 makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation,
501 Gilles Vollant)
502 Changed "ln -s -f" to "ln -f -s" in the makefiles to make Solaris happy.
503 Added some aliases for png_set_expand() in pngrtran.c, namely
504 png_set_expand_PLTE(), png_set_expand_depth(), and png_set_expand_tRNS()
505 (Greg Roelofs, in "PNG: The Definitive Guide").
506 Added makefile.beo for BEOS on X86, contributed by Sander Stok.
507
508 Version 1.0.3b [August 26, 1999]
509 Replaced 2147483647L several places with PNG_MAX_UINT macro, defined in png.h
510 Changed leading blanks to tabs in all makefiles.
511 Define PNG_USE_PNGVCRD in makefile.w32, to get MMX assembler code.
512 Made alternate versions of png_set_expand() in pngrtran.c, namely
513 png_set_gray_1_2_4_to_8, png_set_palette_to_rgb, and png_set_tRNS_to_alpha
514 (Greg Roelofs, in "PNG: The Definitive Guide"). Deleted the 1.0.3a aliases.
515 Relocated start of 'extern "C"' block in png.h so it doesn't include pngconf.h
516 Revised calculation of num_blocks in pngmem.c to avoid a potentially
517 negative shift distance, whose results are undefined in the C language.
518 Added a check in pngset.c to prevent writing multiple tIME chunks.
519 Added a check in pngwrite.c to detect invalid small window_bits sizes.
520
521 Version 1.0.3d [September 4, 1999]
522 Fixed type casting of igamma in pngrutil.c
523 Added new png_expand functions to scripts/pngdef.pas and pngos2.def
524 Added a demo read_user_transform_fn that examines the row filters in pngtest.c
525
526 Version 1.0.4 [September 24, 1999, not distributed publicly]
527 Define PNG_ALWAYS_EXTERN in pngconf.h if __STDC__ is defined
528 Delete #define PNG_INTERNAL and include "png.h" from pngasmrd.h
529 Made several minor corrections to pngtest.c
530 Renamed the makefiles with longer but more user friendly extensions.
531 Copied the PNG copyright and license to a separate LICENSE file.
532 Revised documentation, png.h, and example.c to remove reference to
533 "viewing_gamma" which no longer appears in the PNG specification.
534 Revised pngvcrd.c to use MMX code for interlacing only on the final pass.
535 Updated pngvcrd.c to use the faster C filter algorithms from libpng-1.0.1a
536 Split makefile.win32vc into two versions, makefile.vcawin32 (uses MMX
537 assembler code) and makefile.vcwin32 (doesn't).
538 Added a CPU timing report to pngtest.c (enabled by defining PNGTEST_TIMING)
539 Added a copy of pngnow.png to the distribution.
540
541 Version 1.0.4a [September 25, 1999]
542 Increase max_pixel_depth in pngrutil.c if a user transform needs it.
543 Changed several division operations to right-shifts in pngvcrd.c
544
545 Version 1.0.4b [September 30, 1999]
546 Added parentheses in line 3732 of pngvcrd.c
547 Added a comment in makefile.linux warning about buggy -O3 in pgcc 2.95.1
548
549 Version 1.0.4c [October 1, 1999]
550 Added a "png_check_version" function in png.c and pngtest.c that will generate
551 a helpful compiler error if an old png.h is found in the search path.
552 Changed type of png_user_transform_depth|channels from int to png_byte.
553 Added "Libpng is OSI Certified Open Source Software" statement to png.h
554
555 Version 1.0.4d [October 6, 1999]
556 Changed 0.45 to 0.45455 in png_set_sRGB()
557 Removed unused PLTE entries from pngnow.png
558 Re-enabled some parts of pngvcrd.c (png_combine_row) that work properly.
559
560 Version 1.0.4e [October 10, 1999]
561 Fixed sign error in pngvcrd.c (Greg Roelofs)
562 Replaced some instances of memcpy with simple assignments in pngvcrd (GR-P)
563
564 Version 1.0.4f [October 15, 1999]
565 Surrounded example.c code with #if 0 .. #endif to prevent people from
566 inadvertently trying to compile it.
567 Changed png_get_header_version() from a function to a macro in png.h
568 Added type casting mostly in pngrtran.c and pngwtran.c
569 Removed some pointless "ptr = NULL" in pngmem.c
570 Added a "contrib" directory containing the source code from Greg's book.
571
572 Version 1.0.5 [October 15, 1999]
573 Minor editing of the INSTALL and README files.
574
575 Version 1.0.5a [October 23, 1999]
576 Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
577 Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
578 Further optimization and bugfix of pngvcrd.c
579 Revised pngset.c so that it does not allocate or free memory in the user's
580 text_ptr structure. Instead, it makes its own copy.
581 Created separate write_end_info_struct in pngtest.c for a more severe test.
582 Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
583
584 Version 1.0.5b [November 23, 1999]
585 Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and
586 PNG_FLAG_WROTE_tIME from flags to mode.
587 Added png_write_info_before_PLTE() function.
588 Fixed some typecasting in contrib/gregbook/*.c
589 Updated scripts/makevms.com and added makevms.com to contrib/gregbook
590 and contrib/pngminus (Martin Zinser)
591
592 Version 1.0.5c [November 26, 1999]
593 Moved png_get_header_version from png.h to png.c, to accommodate ansi2knr.
594 Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
595 accommodate making DLL's: Moved usr_png_ver from global variable to function
596 png_get_header_ver() in png.c. Moved png_sig to png_sig_bytes in png.c and
597 eliminated use of png_sig in pngwutil.c. Moved the various png_CHNK arrays
598 into pngtypes.h. Eliminated use of global png_pass arrays. Declared the
599 png_CHNK and png_pass arrays to be "const". Made the global arrays
600 available to applications (although none are used in libpng itself) when
601 PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
602 Removed some extraneous "-I" from contrib/pngminus/makefile.std
603 Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
604 Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
605
606 Version 1.0.5d [November 29, 1999]
607 Add type cast (png_const_charp) two places in png.c
608 Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
609 Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
610 to applications a macro "PNG_USE_LOCAL_ARRAYS".
611 comment out (with #ifdef) all the new declarations when
612 PNG_USE_GLOBAL_ARRAYS is defined.
613 Added PNG_EXPORT_VAR macro to accommodate making DLL's.
614
615 Version 1.0.5e [November 30, 1999]
616 Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
617 structure; refactored the inflate/deflate support to make adding new chunks
618 with trailing compressed parts easier in the future, and added new functions
619 png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
620 png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
621 NOTE: Applications that write text chunks MUST define png_text->lang
622 before calling png_set_text(). It must be set to NULL if you want to
623 write tEXt or zTXt chunks. If you want your application to be able to
624 run with older versions of libpng, use
625
626 #ifdef PNG_iTXt_SUPPORTED
627 png_text[i].lang = NULL;
628 #endif
629
630 Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned
631 offsets (Eric S. Raymond).
632 Combined PNG_READ_cHNK_SUPPORTED and PNG_WRITE_cHNK_SUPPORTED macros into
633 PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
634 macros, leaving the separate macros also available.
635 Removed comments on #endifs at the end of many short, non-nested #if-blocks.
636
637 Version 1.0.5f [December 6, 1999]
638 Changed makefile.solaris to issue a warning about potential problems when
639 the ucb "ld" is in the path ahead of the ccs "ld".
640 Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
641 Added sCAL chunk support (Eric S. Raymond).
642
643 Version 1.0.5g [December 7, 1999]
644 Fixed "png_free_spallettes" typo in png.h
645 Added code to handle new chunks in pngpread.c
646 Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
647 Added "translated_key" to png_text structure and png_write_iTXt().
648 Added code in pngwrite.c to work around a newly discovered zlib bug.
649
650 Version 1.0.5h [December 10, 1999]
651 NOTE: regarding the note for version 1.0.5e, the following must also
652 be included in your code:
653 png_text[i].translated_key = NULL;
654 Unknown chunk handling is now supported.
655 Option to eliminate all floating point support was added. Some new
656 fixed-point functions such as png_set_gAMA_fixed() were added.
657 Expanded tabs and removed trailing blanks in source files.
658
659 Version 1.0.5i [December 13, 1999]
660 Added some type casts to silence compiler warnings.
661 Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
662 Removed leading blanks from a #define in pngvcrd.c
663 Added some parameters to the new png_set_keep_unknown_chunks() function.
664 Added a test for up->location != 0 in the first instance of writing
665 unknown chunks in pngwrite.c
666 Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
667 prevent recursion.
668 Added png_free_hIST() function.
669 Various patches to fix bugs in the sCAL and integer cHRM processing,
670 and to add some convenience macros for use with sCAL.
671
672 Version 1.0.5j [December 21, 1999]
673 Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
674 around buggy compilers.
675 Added new type "png_fixed_point" for integers that hold float*100000 values
676 Restored backward compatibility of tEXt/zTXt chunk processing:
677 Restored the first four members of png_text to the same order as v.1.0.5d.
678 Added members "lang_key" and "itxt_length" to png_text struct. Set
679 text_length=0 when "text" contains iTXt data. Use the "compression"
680 member to distinguish among tEXt/zTXt/iTXt types. Added
681 PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
682 The "Note" above, about backward incompatibility of libpng-1.0.5e, no
683 longer applies.
684 Fixed png_read|write_iTXt() to read|write parameters in the right order,
685 and to write the iTXt chunk after IDAT if it appears in the end_ptr.
686 Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
687 Reversed the order of trying to write floating-point and fixed-point gAMA.
688
689 Version 1.0.5k [December 27, 1999]
690 Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
691 Added png_handle_as_unknown() function (Glenn)
692 Added png_free_chunk_list() function and chunk_list and num_chunk_list members
693 of png_ptr.
694 Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
695 Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
696 about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
697 Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
698 Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
699 Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
700
701 Version 1.0.5l [January 1, 2000]
702 Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
703 for setting a callback function to handle unknown chunks and for
704 retrieving the associated user pointer (Glenn).
705
706 Version 1.0.5m [January 7, 2000]
707 Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
708
709 Version 1.0.5n [January 9, 2000]
710 Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
711 own memory for info_ptr->palette. This makes it safe for the calling
712 application to free its copy of the palette any time after it calls
713 png_set_PLTE().
714
715 Version 1.0.5o [January 20, 2000]
716 Cosmetic changes only (removed some trailing blanks and TABs)
717
718 Version 1.0.5p [January 31, 2000]
719 Renamed pngdll.mak to makefile.bd32
720 Cosmetic changes in pngtest.c
721
722 Version 1.0.5q [February 5, 2000]
723 Relocated the makefile.solaris warning about PATH problems.
724 Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
725 Revised makefile.gcmmx
726 Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros
727
728 Version 1.0.5r [February 7, 2000]
729 Removed superfluous prototype for png_get_itxt from png.h
730 Fixed a bug in pngrtran.c that improperly expanded the background color.
731 Return *num_text=0 from png_get_text() when appropriate, and fix documentation
732 of png_get_text() in libpng.txt/libpng.3.
733
734 Version 1.0.5s [February 18, 2000]
735 Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the
736 new error handler that's planned for the next libpng release, and changed
737 example.c, pngtest.c, and contrib programs to use this macro.
738 Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)
739 Fixed a bug in png_read_png() that caused it to fail to expand some images
740 that it should have expanded.
741 Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
742 in pngget.c
743 Changed the allocation of palette, history, and trans arrays back to
744 the version 1.0.5 method (linking instead of copying) which restores
745 backward compatibility with version 1.0.5. Added some remarks about
746 that in example.c. Added "free_me" member to info_ptr and png_ptr
747 and added png_free_data() function.
748 Updated makefile.linux and makefile.gccmmx to make directories conditionally.
749 Made cosmetic changes to pngasmrd.h
750 Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
751 Modified png_read_png() to allocate info_ptr->row_pointers only if it
752 hasn't already been allocated.
753
754 Version 1.0.5t [March 4, 2000]
755 Changed png_jmp_env() migration aiding macro to png_jmpbuf().
756 Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
757 Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
758 PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b
759 Files in contrib/gregbook were revised to use png_jmpbuf() and to select
760 a 24-bit visual if one is available, and to allow abbreviated options.
761 Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
762 Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
763
764 Version 1.0.5u [March 5, 2000]
765 Simplified the code that detects old png.h in png.c and pngtest.c
766 Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
767 Increased precision of rgb_to_gray calculations from 8 to 15 bits and
768 added png_set_rgb_to_gray_fixed() function.
769 Added makefile.bc32 (32-bit Borland C++, C mode)
770
771 Version 1.0.5v [March 11, 2000]
772 Added some parentheses to the png_jmpbuf macro definition.
773 Updated references to the zlib home page, which has moved to freesoftware.com.
774 Corrected bugs in documentation regarding png_read_row() and png_write_row().
775 Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.
776 Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
777 revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
778
779 Version 1.0.6 [March 20, 2000]
780 Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
781 Added makefile.sggcc (SGI IRIX with gcc)
782
783 Version 1.0.6d [April 7, 2000]
784 Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
785 Added data_length parameter to png_decompress_chunk() function
786 Revised documentation to remove reference to abandoned png_free_chnk functions
787 Fixed an error in png_rgb_to_gray_fixed()
788 Revised example.c, usage of png_destroy_write_struct().
789 Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
790 Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c
791 Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
792
793 Version 1.0.6e [April 9, 2000]
794 Added png_data_freer() function.
795 In the code that checks for over-length tRNS chunks, added check of
796 info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
797 Minor revisions of libpng.txt/libpng.3.
798 Check for existing data and free it if the free_me flag is set, in png_set_*()
799 and png_handle_*().
800 Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
801 is defined.
802 Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
803 and mentioned the purposes of the two macros in libpng.txt/libpng.3.
804
805 Version 1.0.6f [April 14, 2000]
806 Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
807 Add checks in png_set_text() for NULL members of the input text structure.
808 Revised libpng.txt/libpng.3.
809 Removed superfluous prototype for png_set_iTXt from png.h
810 Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
811 Changed several png_errors about malformed ancillary chunks to png_warnings.
812
813 Version 1.0.6g [April 24, 2000]
814 Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
815 Relocated paragraph about png_set_background() in libpng.3/libpng.txt
816 and other revisions (Matthias Benckmann)
817 Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
818 png_ptr members to restore binary compatibility with libpng-1.0.5
819 (breaks compatibility with libpng-1.0.6).
820
821 Version 1.0.6h [April 24, 2000]
822 Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds
823 libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h)
824 This is a temporary change for test purposes.
825
826 Version 1.0.6i [May 2, 2000]
827 Rearranged some members at the end of png_info and png_struct, to put
828 unknown_chunks_num and free_me within the original size of the png_structs
829 and free_me, png_read_user_fn, and png_free_fn within the original png_info,
830 because some old applications allocate the structs directly instead of
831 using png_create_*().
832 Added documentation of user memory functions in libpng.txt/libpng.3
833 Modified png_read_png so that it will use user_allocated row_pointers
834 if present, unless free_me directs that it be freed, and added description
835 of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
836 Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
837 1.00) members of png_struct and png_info, to regain binary compatibility
838 when you define this macro. Capabilities lost in this event
839 are user transforms (new in version 1.0.0),the user transform pointer
840 (new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
841 the high-level interface, and unknown chunks support (all new in 1.0.6).
842 This was necessary because of old applications that allocate the structs
843 directly as authors were instructed to do in libpng-0.88 and earlier,
844 instead of using png_create_*().
845 Added modes PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT which
846 can be used to detect codes that directly allocate the structs, and
847 code to check these modes in png_read_init() and png_write_init() and
848 generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED
849 was not defined.
850 Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
851
852 Version 1.0.6j [May 3, 2000]
853 Overloaded png_read_init() and png_write_init() with macros that convert
854 calls to png_read_init_2() or png_write_init_2() that check the version
855 and structure sizes.
856
857 Version 1.0.7beta11 [May 7, 2000]
858 Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes
859 which are no longer used.
860 Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is
861 defined or when neither PNG_READ_iTXt_SUPPORTED nor PNG_WRITE_iTXT_SUPPORTED
862 is defined.
863 Made PNG_NO_READ|WRITE_iTXt the default setting, to avoid memory
864 overrun when old applications fill the info_ptr->text structure directly.
865 Added PNGAPI macro, and added it to the definitions of all exported functions.
866 Relocated version macro definitions ahead of the includes of zlib.h and
867 pngconf.h in png.h.
868
869 Version 1.0.7beta12 [May 12, 2000]
870 Revised pngset.c to avoid a problem with expanding the png_debug macro.
871 Deleted some extraneous defines from pngconf.h
872 Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
873 Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
874 Added png_access_version_number() function.
875 Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
876 Expanded libpng.3/libpng.txt information about png_data_freer().
877
878 Version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
879 Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
880 warnings instead of errors, as pngrutil.c does.
881 Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
882 will actually write IDATs.
883 Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
884 Make png_free_data() ignore its final parameter except when freeing data
885 that can have multiple instances (text, sPLT, unknowns).
886 Fixed a new bug in png_set_rows().
887 Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
888 Added png_set_invalid() function.
889 Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
890
891 Version 1.0.7beta15 [May 30, 2000]
892 Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
893 fewer error messages.
894 Rearranged checks for Z_OK to check the most likely path first in pngpread.c
895 and pngwutil.c.
896 Added checks in pngtest.c for png_create_*() returning NULL, and mentioned
897 in libpng.txt/libpng.3 the need for applications to check this.
898 Changed names of png_default_*() functions in pngtest to pngtest_*().
899 Changed return type of png_get_x|y_offset_*() from png_uint_32 to png_int_32.
900 Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c
901 Set each pointer to NULL after freeing it in png_free_data().
902 Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
903 macro that conflicts with libpng's png_color_16.index. (Dimitri
904 Papadapoulos)
905 Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).
906
907 Version 1.0.7beta16 [June 4, 2000]
908 Revised the workaround of AIX string.h "index" bug.
909 Added a check for overlength PLTE chunk in pngrutil.c.
910 Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
911 indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
912 Added a warning in png_decompress_chunk() when it runs out of data, e.g.
913 when it tries to read an erroneous PhotoShop iCCP chunk.
914 Added PNG_USE_DLL macro.
915 Revised the copyright/disclaimer/license notice.
916 Added contrib/msvctest directory
917
918 Version 1.0.7rc1 [June 9, 2000]
919 Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA (0x0400 not 0x0200)
920 Added contrib/visupng directory (Willem van Schaik)
921
922 Version 1.0.7beta18 [June 23, 2000]
923 Revised PNGAPI definition, and pngvcrd.c to work with __GCC__
924 and do not redefine PNGAPI if it is passed in via a compiler directive.
925 Revised visupng/PngFile.c to remove returns from within the Try block.
926 Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
927 Updated contrib/visupng/cexcept.h to version 1.0.0.
928 Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
929
930 Version 1.0.7rc2 [June 28, 2000]
931 Updated license to include disclaimers required by UCITA.
932 Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
933
934 Version 1.0.7 [July 1, 2000]
935 Revised the definition of "trans_values" in libpng.3/libpng.txt
936
937 Version 1.0.8beta1 [July 8, 2000]
938 Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
939 Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
940 pngwutil.c.
941 Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
942 Removed unused "#include <assert.h>" from png.c
943 Added WindowsCE support.
944 Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.
945
946 Version 1.0.8beta2 [July 10, 2000]
947 Added project files to the wince directory and made further revisions
948 of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.
949
950 Version 1.0.8beta3 [July 11, 2000]
951 Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()
952 for indexed-color input files to avoid potential double-freeing trans array
953 under some unusual conditions; problem was introduced in version 1.0.6f.
954 Further revisions to pngtest.c and files in the wince subdirectory.
955
956 Version 1.0.8beta4 [July 14, 2000]
957 Added the files pngbar.png and pngbar.jpg to the distribution.
958 Added makefile.cygwin, and cygwin support in pngconf.h
959 Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)
960
961 Version 1.0.8rc1 [July 16, 2000]
962 Revised png_debug() macros and statements to eliminate compiler warnings.
963
964 Version 1.0.8 [July 24, 2000]
965 Added png_flush() in pngwrite.c, after png_write_IEND().
966 Updated makefile.hpux to build a shared library.
967
968 Version 1.0.9beta1 [November 10, 2000]
969 Fixed typo in scripts/makefile.hpux
970 Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser)
971 Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)
972 Changed "cdrom.com" in documentation to "libpng.org"
973 Revised pnggccrd.c to get it all working, and updated makefile.gcmmx (Greg).
974 Changed type of "params" from voidp to png_voidp in png_read|write_png().
975 Make sure PNGAPI and PNG_IMPEXP are defined in pngconf.h.
976 Revised the 3 instances of WRITEFILE in pngtest.c.
977 Relocated "msvc" and "wince" project subdirectories into "dll" subdirectory.
978 Updated png.rc in dll/msvc project
979 Revised makefile.dec to define and use LIBPATH and INCPATH
980 Increased size of global png_libpng_ver[] array from 12 to 18 chars.
981 Made global png_libpng_ver[], png_sig[] and png_pass_*[] arrays const.
982 Removed duplicate png_crc_finish() from png_handle_bKGD() function.
983 Added a warning when application calls png_read_update_info() multiple times.
984 Revised makefile.cygwin
985 Fixed bugs in iCCP support in pngrutil.c and pngwutil.c.
986 Replaced png_set_empty_plte_permitted() with png_permit_mng_features().
987
988 Version 1.0.9beta2 [November 19, 2000]
989 Renamed the "dll" subdirectory "projects".
990 Added borland project files to "projects" subdirectory.
991 Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
992 Add error message in png_set_compression_buffer_size() when malloc fails.
993
994 Version 1.0.9beta3 [November 23, 2000]
995 Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
996 Removed the png_flush() in pngwrite.c that crashes some applications
997 that don't set png_output_flush_fn.
998 Added makefile.macosx and makefile.aix to scripts directory.
999
1000 Version 1.0.9beta4 [December 1, 2000]
1001 Change png_chunk_warning to png_warning in png_check_keyword().
1002 Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
1003
1004 Version 1.0.9beta5 [December 15, 2000]
1005 Added support for filter method 64 (for PNG datastreams embedded in MNG).
1006
1007 Version 1.0.9beta6 [December 18, 2000]
1008 Revised png_set_filter() to accept filter method 64 when appropriate.
1009 Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
1010 help prevent applications from using MNG features in PNG datastreams.
1011 Added png_permit_mng_features() function.
1012 Revised libpng.3/libpng.txt. Changed "filter type" to "filter method".
1013
1014 Version 1.0.9rc1 [December 23, 2000]
1015 Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
1016 Fixed error handling of unknown compression type in png_decompress_chunk().
1017 In pngconf.h, define __cdecl when _MSC_VER is defined.
1018
1019 Version 1.0.9beta7 [December 28, 2000]
1020 Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
1021 Revised memory management in png_set_hIST and png_handle_hIST in a backward
1022 compatible manner. PLTE and tRNS were revised similarly.
1023 Revised the iCCP chunk reader to ignore trailing garbage.
1024
1025 Version 1.0.9beta8 [January 12, 2001]
1026 Moved pngasmrd.h into pngconf.h.
1027 Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop.
1028
1029 Version 1.0.9beta9 [January 15, 2001]
1030 Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to
1031 wince and msvc project module definition files.
1032 Minor revision of makefile.cygwin.
1033 Fixed bug with progressive reading of narrow interlaced images in pngpread.c
1034
1035 Version 1.0.9beta10 [January 16, 2001]
1036 Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined.
1037 Fixed "png_mmx_supported" typo in project definition files.
1038
1039 Version 1.0.9beta11 [January 19, 2001]
1040 Updated makefile.sgi to make shared library.
1041 Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED
1042 by default, for the benefit of DLL forward compatibility. These will
1043 be re-enabled in version 1.2.0.
1044
1045 Version 1.0.9rc2 [January 22, 2001]
1046 Revised cygwin support.
1047
1048 Version 1.0.9 [January 31, 2001]
1049 Added check of cygwin's ALL_STATIC in pngconf.h
1050 Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos.
1051
1052 Version 1.0.10beta1 [March 14, 2001]
1053 Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc.
1054 Reformatted libpng.3 to eliminate bad line breaks.
1055 Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c
1056 Added prototype for png_mmx_support() near the top of pnggccrd.c
1057 Moved some error checking from png_handle_IHDR to png_set_IHDR.
1058 Added PNG_NO_READ_SUPPORTED and PNG_NO_WRITE_SUPPORTED macros.
1059 Revised png_mmx_support() function in pnggccrd.c
1060 Restored version 1.0.8 PNG_WRITE_EMPTY_PLTE_SUPPORTED behavior in pngwutil.c
1061 Fixed memory leak in contrib/visupng/PngFile.c
1062 Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version)
1063 Added warnings when retrieving or setting gamma=0.
1064 Increased the first part of msg buffer from 16 to 18 in png_chunk_warning().
1065
1066 Version 1.0.10rc1 [March 23, 2001]
1067 Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy,
1068 and png_strlen.
1069 Revised png_mmx_supported() function in pnggccrd.c to return proper value.
1070 Fixed bug in progressive reading (pngpread.c) with small images (height < 8).
1071
1072 Version 1.0.10 [March 30, 2001]
1073 Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin
1074 Added beos project files (Chris Herborth)
1075
1076 Version 1.0.11beta1 [April 3, 2001]
1077 Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
1078 Removed a no-longer needed AIX work-around from pngconf.h
1079 Changed several "//" single-line comments to C-style in pnggccrd.c
1080
1081 Version 1.0.11beta2 [April 11, 2001]
1082 Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
1083 Updated scripts/pngos2.def
1084
1085 Version 1.0.11beta3 [April 14, 2001]
1086 Added checking the results of many instances of png_malloc() for NULL
1087
1088 Version 1.0.11beta4 [April 20, 2001]
1089 Undid the changes from version 1.0.11beta3. Added a check for NULL return
1090 from user's malloc_fn().
1091 Removed some useless type casts of the NULL pointer.
1092 Added makefile.netbsd
1093
1094 Version 1.0.11 [April 27, 2001]
1095 Revised makefile.netbsd
1096
1097 Version 1.0.12beta1 [May 14, 2001]
1098 Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
1099 Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
1100 Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
1101 Eliminated the png_error about apps using png_read|write_init(). Instead,
1102 libpng will reallocate the png_struct and info_struct if they are too small.
1103 This retains future binary compatibility for old applications written for
1104 libpng-0.88 and earlier.
1105
1106 Version 1.2.0beta1 [May 6, 2001]
1107 Bumped DLLNUM to 2.
1108 Re-enabled PNG_MNG_FEATURES_SUPPORTED and enabled PNG_ASSEMBLER_CODE_SUPPORTED
1109 by default.
1110 Added runtime selection of MMX features.
1111 Added png_set_strip_error_numbers function and related macros.
1112
1113 Version 1.2.0beta2 [May 7, 2001]
1114 Finished merging 1.2.0beta1 with version 1.0.11
1115 Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
1116
1117 Version 1.2.0beta3 [May 17, 2001]
1118 Enabled user memory function by default.
1119 Modified png_create_struct so it passes user mem_ptr to user memory allocator.
1120 Increased png_mng_features flag from png_byte to png_uint_32.
1121 Bumped shared-library (so-number) and dll-number to 3.
1122
1123 Version 1.2.0beta4 [June 23, 2001]
1124 Check for missing profile length field in iCCP chunk and free chunk_data
1125 in case of truncated iCCP chunk.
1126 Bumped shared-library number to 3 in makefile.sgi and makefile.sggcc
1127 Bumped dll-number from 2 to 3 in makefile.cygwin
1128 Revised contrib/gregbook/rpng*-x.c to avoid a memory leak and to exit cleanly
1129 if user attempts to run it on an 8-bit display.
1130 Updated contrib/gregbook
1131 Use png_malloc instead of png_zalloc to allocate palette in pngset.c
1132 Updated makefile.ibmc
1133 Added some typecasts to eliminate gcc 3.0 warnings. Changed prototypes
1134 of png_write_oFFS width and height from png_uint_32 to png_int_32.
1135 Updated example.c
1136 Revised prototypes for png_debug_malloc and png_debug_free in pngtest.c
1137
1138 Version 1.2.0beta5 [August 8, 2001]
1139 Revised contrib/gregbook
1140 Revised makefile.gcmmx
1141 Revised pnggccrd.c to conditionally compile some thread-unsafe code only
1142 when PNG_THREAD_UNSAFE_OK is defined.
1143 Added tests to prevent pngwutil.c from writing a bKGD or tRNS chunk with
1144 value exceeding 2^bit_depth-1
1145 Revised makefile.sgi and makefile.sggcc
1146 Replaced calls to fprintf(stderr,...) with png_warning() in pnggccrd.c
1147 Removed restriction that do_invert_mono only operate on 1-bit opaque files
1148
1149 Version 1.2.0 [September 1, 2001]
1150 Changed a png_warning() to png_debug() in pnggccrd.c
1151 Fixed contrib/gregbook/rpng-x.c, rpng2-x.c to avoid crash with XFreeGC().
1152
1153 Version 1.2.1beta1 [October 19, 2001]
1154 Revised makefile.std in contrib/pngminus
1155 Include background_1 in png_struct regardless of gamma support.
1156 Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
1157 Revised example.c to provide more details about using row_callback().
1158
1159 Version 1.2.1beta2 [October 25, 2001]
1160 Added type cast to each NULL appearing in a function call, except for
1161 WINCE functions.
1162 Added makefile.so9.
1163
1164 Version 1.2.1beta3 [October 27, 2001]
1165 Removed type casts from all NULLs.
1166 Simplified png_create_struct_2().
1167
1168 Version 1.2.1beta4 [November 7, 2001]
1169 Revised png_create_info_struct() and png_creat_struct_2().
1170 Added error message if png_write_info() was omitted.
1171 Type cast NULLs appearing in function calls when _NO_PROTO or
1172 PNG_TYPECAST_NULL is defined.
1173
1174 Version 1.2.1rc1 [November 24, 2001]
1175 Type cast NULLs appearing in function calls except when PNG_NO_TYPECAST_NULL
1176 is defined.
1177 Changed typecast of "size" argument to png_size_t in pngmem.c calls to
1178 the user malloc_fn, to agree with the prototype in png.h
1179 Added a pop/push operation to pnggccrd.c, to preserve Eflag (Maxim Sobolev)
1180 Updated makefile.sgi to recognize LIBPATH and INCPATH.
1181 Updated various makefiles so "make clean" does not remove previous major
1182 version of the shared library.
1183
1184 Version 1.2.1rc2 [December 4, 2001]
1185 Always allocate 256-entry internal palette, hist, and trans arrays, to
1186 avoid out-of-bounds memory reference caused by invalid PNG datastreams.
1187 Added a check for prefix_length > data_length in iCCP chunk handler.
1188
1189 Version 1.2.1 [December 7, 2001]
1190 None.
1191
1192 Version 1.2.2beta1 [February 22, 2002]
1193 Fixed a bug with reading the length of iCCP profiles (Larry Reeves).
1194 Revised makefile.linux, makefile.gcmmx, and makefile.sgi to generate
1195 libpng.a, libpng12.so (not libpng.so.3), and libpng12/png.h
1196 Revised makefile.darwin to remove "-undefined suppress" option.
1197 Added checks for gamma and chromaticity values over 21474.83, which exceed
1198 the limit for PNG unsigned 32-bit integers when encoded.
1199 Revised calls to png_create_read_struct() and png_create_write_struct()
1200 for simpler debugging.
1201 Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK)
1202
1203 Version 1.2.2beta2 [February 23, 2002]
1204 Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths.
1205 Check for invalid image dimensions in png_get_IHDR.
1206 Added missing "fi;" in the install target of the SGI makefiles.
1207 Added install-static to all makefiles that make shared libraries.
1208 Always do gamma compensation when image is partially transparent.
1209
1210 Version 1.2.2beta3 [March 7, 2002]
1211 Compute background.gray and background_1.gray even when color_type is RGB
1212 in case image gets reduced to gray later.
1213 Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
1214 Export (with PNGAPI) png_zalloc, png_zfree, and png_handle_as_unknown
1215 Removed unused png_write_destroy_info prototype from png.h
1216 Eliminated incorrect use of width_mmx from pnggccrd.c in pixel_bytes == 8 case
1217 Added install-shared target to all makefiles that make shared libraries.
1218 Stopped a double free of palette, hist, and trans when not using free_me.
1219 Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
1220
1221 Version 1.2.2beta4 [March 8, 2002]
1222 Compute background.gray and background_1.gray even when color_type is RGB
1223 in case image gets reduced to gray later (Jason Summers).
1224 Relocated a misplaced /bin/rm in the "install-shared" makefile targets
1225 Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library.
1226
1227 Version 1.2.2beta5 [March 26, 2002]
1228 Added missing PNGAPI to several function definitions.
1229 Check for invalid bit_depth or color_type in png_get_IHDR(), and
1230 check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen).
1231 Revised iTXt support to accept NULL for lang and lang_key.
1232 Compute gamma for color components of background even when color_type is gray.
1233 Changed "()" to "{}" in scripts/libpng.pc.in.
1234 Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN
1235 Revised makefiles to make symlink to libpng.so.NN in addition to libpngNN.so
1236
1237 Version 1.2.2beta6 [March 31, 2002]
1238
1239 Version 1.0.13beta1 [March 31, 2002]
1240 Prevent png_zalloc() from trying to memset memory that it failed to acquire.
1241 Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate).
1242 Ensure that the right function (user or default) is used to free the
1243 png_struct after an error in png_create_read_struct_2().
1244
1245 Version 1.2.2rc1 [April 7, 2002]
1246
1247 Version 1.0.13rc1 [April 7, 2002]
1248 Save the ebx register in pnggccrd.c (Sami Farin)
1249 Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner).
1250 Updated makefiles to put headers in include/libpng and remove old include/*.h.
1251
1252 Version 1.2.2 [April 15, 2002]
1253
1254 Version 1.0.13 [April 15, 2002]
1255 Revised description of png_set_filter() in libpng.3/libpng.txt.
1256 Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd
1257
1258 Version 1.0.13patch01 [April 17, 2002]
1259
1260 Version 1.2.2patch01 [April 17, 2002]
1261 Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and
1262 makefile.sggcc
1263 Fixed VER -> PNGVER typo in makefile.macosx and added install-static to
1264 install
1265 Added install: target to makefile.32sunu and makefile.64sunu
1266
1267 Version 1.0.13patch03 [April 18, 2002]
1268
1269 Version 1.2.2patch03 [April 18, 2002]
1270 Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng
1271 subdirectory to libpngNN subdirectory without the full pathname.
1272 Moved generation of libpng.pc from "install" to "all" in 15 makefiles.
1273
1274 Version 1.2.3rc1 [April 28, 2002]
1275 Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos).
1276 Added $(DESTDIR) feature to 24 makefiles (Tim Mooney)
1277 Fixed bug with $prefix, should be $(prefix) in makefile.hpux.
1278 Updated cygwin-specific portion of pngconf.h and revised makefile.cygwin
1279 Added a link from libpngNN.pc to libpng.pc in 15 makefiles.
1280 Added links from include/libpngNN/*.h to include/*.h in 24 makefiles.
1281 Revised makefile.darwin to make relative links without full pathname.
1282 Added setjmp() at the end of png_create_*_struct_2() in case user forgets
1283 to put one in their application.
1284 Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and
1285 removed them from module definition files.
1286
1287 Version 1.2.3rc2 [May 1, 2002]
1288 Fixed bug in reporting number of channels in pngget.c and pngset.c,
1289 that was introduced in version 1.2.2beta5.
1290 Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(),
1291 png_default_flush(), and png_push_fill_buffer() and included them in
1292 module definition files.
1293 Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles.
1294
1295 Version 1.2.3rc3 [May 1, 2002]
1296 Revised prototype for png_default_flush()
1297 Remove old libpng.pc and libpngNN.pc before installing new ones.
1298
1299 Version 1.2.3rc4 [May 2, 2002]
1300 Typos in *.def files (png_default_read|write -> png_default_read|write_data)
1301 In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc
1302 Added libpng-config and libpngNN-config and modified makefiles to install
1303 them.
1304 Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles
1305 Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp
1306
1307 Version 1.2.3rc5 [May 11, 2002]
1308 Changed "error" and "message" in prototypes to "error_message" and
1309 "warning_message" to avoid namespace conflict.
1310 Revised 15 makefiles to build libpng-config from libpng-config-*.in
1311 Once more restored png_zalloc and png_zfree to regular nonexported form.
1312 Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer
1313 to nonexported form, but with PNGAPI, and removed them from module def
1314 files.
1315
1316 Version 1.2.3rc6 [May 14, 2002]
1317 Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c
1318 Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp.
1319 Removed leftover libpng-config "sed" script from four makefiles.
1320 Revised libpng-config creating script in 16 makefiles.
1321
1322 Version 1.2.3 [May 22, 2002]
1323 Revised libpng-config target in makefile.cygwin.
1324 Removed description of png_set_mem_fn() from documentation.
1325 Revised makefile.freebsd.
1326 Minor cosmetic changes to 15 makefiles, e.g., $(DI) = $(DESTDIR)/$(INCDIR).
1327 Revised projects/msvc/README.txt
1328 Changed -lpng to -lpngNN in LDFLAGS in several makefiles.
1329
1330 Version 1.2.4beta1 [May 24, 2002]
1331 Added libpng.pc and libpng-config to "all:" target in 16 makefiles.
1332 Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH)
1333 Added missing "\" before closing double quote in makefile.gcmmx.
1334 Plugged various memory leaks; added png_malloc_warn() and png_set_text_2()
1335 functions.
1336
1337 Version 1.2.4beta2 [June 25, 2002]
1338 Plugged memory leak of png_ptr->current_text (Matt Holgate).
1339 Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison)
1340 Added -soname to the loader flags in makefile.dec, makefile.sgi, and
1341 makefile.sggcc.
1342 Added "test-installed" target to makefile.linux, makefile.gcmmx,
1343 makefile.sgi, and makefile.sggcc.
1344
1345 Version 1.2.4beta3 [June 28, 2002]
1346 Plugged memory leak of row_buf in pngtest.c when there is a png_error().
1347 Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
1348 Added "test-installed" target to makefile.32sunu, makefile.64sunu,
1349 makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
1350 makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
1351
1352 Version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002]
1353 Added "test-installed" target to makefile.cygwin and makefile.sco.
1354 Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro.
1355
1356 Version 1.2.4 and 1.0.14 [July 8, 2002]
1357 Changed png_warning() to png_error() when width is too large to process.
1358
1359 Version 1.2.4patch01 [July 20, 2002]
1360 Revised makefile.cygwin to use DLL number 12 instead of 13.
1361
1362 Version 1.2.5beta1 [August 6, 2002]
1363 Added code to contrib/gregbook/readpng2.c to ignore unused chunks.
1364 Replaced toucan.png in contrib/gregbook (it has been corrupt since 1.0.11)
1365 Removed some stray *.o files from contrib/gregbook.
1366 Changed png_error() to png_warning() about "Too much data" in pngpread.c
1367 and about "Extra compressed data" in pngrutil.c.
1368 Prevent png_ptr->pass from exceeding 7 in png_push_finish_row().
1369 Updated makefile.hpgcc
1370 Updated png.c and pnggccrd.c handling of return from png_mmx_support()
1371
1372 Version 1.2.5beta2 [August 15, 2002]
1373 Only issue png_warning() about "Too much data" in pngpread.c when avail_in
1374 is nonzero.
1375 Updated makefiles to install a separate libpng.so.3 with its own rpath.
1376
1377 Version 1.2.5rc1 and 1.0.15rc1 [August 24, 2002]
1378 Revised makefiles to not remove previous minor versions of shared libraries.
1379
1380 Version 1.2.5rc2 and 1.0.15rc2 [September 16, 2002]
1381 Revised 13 makefiles to remove "-lz" and "-L$(ZLIBLIB)", etc., from shared
1382 library loader directive.
1383 Added missing "$OBJSDLL" line to makefile.gcmmx.
1384 Added missing "; fi" to makefile.32sunu.
1385
1386 Version 1.2.5rc3 and 1.0.15rc3 [September 18, 2002]
1387 Revised libpng-config script.
1388
1389 Version 1.2.5 and 1.0.15 [October 3, 2002]
1390 Revised makefile.macosx, makefile.darwin, makefile.hpgcc, and makefile.hpux,
1391 and makefile.aix.
1392 Relocated two misplaced PNGAPI lines in pngtest.c
1393
1394 Version 1.2.6beta1 [October 22, 2002]
1395 Commented out warning about uninitialized mmx_support in pnggccrd.c.
1396 Changed "IBMCPP__" flag to "__IBMCPP__" in pngconf.h.
1397 Relocated two more misplaced PNGAPI lines in pngtest.c
1398 Fixed memory overrun bug in png_do_read_filler() with 16-bit datastreams,
1399 introduced in version 1.0.2.
1400 Revised makefile.macosx, makefile.dec, makefile.aix, and makefile.32sunu.
1401
1402 Version 1.2.6beta2 [November 1, 2002]
1403 Added libpng-config "--ldopts" output.
1404 Added "AR=ar" and "ARFLAGS=rc" and changed "ar rc" to "$(AR) $(ARFLAGS)"
1405 in makefiles.
1406
1407 Version 1.2.6beta3 [July 18, 2004]
1408 Reverted makefile changes from version 1.2.6beta2 and some of the changes
1409 from version 1.2.6beta1; these will be postponed until version 1.2.7.
1410 Version 1.2.6 is going to be a simple bugfix release.
1411 Changed the one instance of "ln -sf" to "ln -f -s" in each Sun makefile.
1412 Fixed potential overrun in pngerror.c by using strncpy instead of memcpy.
1413 Added "#!/bin/sh" at the top of configure, for recognition of the
1414 'x' flag under Cygwin (Cosmin).
1415 Optimized vacuous tests that silence compiler warnings, in png.c (Cosmin).
1416 Added support for PNG_USER_CONFIG, in pngconf.h (Cosmin).
1417 Fixed the special memory handler for Borland C under DOS, in pngmem.c
1418 (Cosmin).
1419 Removed some spurious assignments in pngrutil.c (Cosmin).
1420 Replaced 65536 with 65536L, and 0xffff with 0xffffL, to silence warnings
1421 on 16-bit platforms (Cosmin).
1422 Enclosed shift op expressions in parentheses, to silence warnings (Cosmin).
1423 Used proper type png_fixed_point, to avoid problems on 16-bit platforms,
1424 in png_handle_sRGB() (Cosmin).
1425 Added compression_type to png_struct, and optimized the window size
1426 inside the deflate stream (Cosmin).
1427 Fixed definition of isnonalpha(), in pngerror.c and pngrutil.c (Cosmin).
1428 Fixed handling of unknown chunks that come after IDAT (Cosmin).
1429 Allowed png_error() and png_warning() to work even if png_ptr == NULL
1430 (Cosmin).
1431 Replaced row_info->rowbytes with row_bytes in png_write_find_filter()
1432 (Cosmin).
1433 Fixed definition of PNG_LIBPNG_VER_DLLNUM (Simon-Pierre).
1434 Used PNG_LIBPNG_VER and PNG_LIBPNG_VER_STRING instead of the hardcoded
1435 values in png.c (Simon-Pierre, Cosmin).
1436 Initialized png_libpng_ver[] with PNG_LIBPNG_VER_STRING (Simon-Pierre).
1437 Replaced PNG_LIBPNG_VER_MAJOR with PNG_LIBPNG_VER_DLLNUM in png.rc
1438 (Simon-Pierre).
1439 Moved the definition of PNG_HEADER_VERSION_STRING near the definitions
1440 of the other PNG_LIBPNG_VER_... symbols in png.h (Cosmin).
1441 Relocated #ifndef PNGAPI guards in pngconf.h (Simon-Pierre, Cosmin).
1442 Updated scripts/makefile.vc(a)win32 (Cosmin).
1443 Updated the MSVC project (Simon-Pierre, Cosmin).
1444 Updated the Borland C++ Builder project (Cosmin).
1445 Avoided access to asm_flags in pngvcrd.c, if PNG_1_0_X is defined (Cosmin).
1446 Commented out warning about uninitialized mmx_support in pngvcrd.c (Cosmin).
1447 Removed scripts/makefile.bd32 and scripts/pngdef.pas (Cosmin).
1448 Added extra guard around inclusion of Turbo C memory headers, in pngconf.h
1449 (Cosmin).
1450 Renamed projects/msvc/ to projects/visualc6/, and projects/borland/ to
1451 projects/cbuilder5/ (Cosmin).
1452 Moved projects/visualc6/png32ms.def to scripts/pngw32.def,
1453 and projects/visualc6/png.rc to scripts/pngw32.rc (Cosmin).
1454 Added projects/visualc6/pngtest.dsp; removed contrib/msvctest/ (Cosmin).
1455 Changed line endings to DOS style in cbuilder5 and visualc6 files, even
1456 in the tar.* distributions (Cosmin).
1457 Updated contrib/visupng/VisualPng.dsp (Cosmin).
1458 Updated contrib/visupng/cexcept.h to version 2.0.0 (Cosmin).
1459 Added a separate distribution with "configure" and supporting files (Junichi).
1460
1461 Version 1.2.6beta4 [July 28, 2004]
1462 Added user ability to change png_size_t via a PNG_SIZE_T macro.
1463 Added png_sizeof() and png_convert_size() functions.
1464 Added PNG_SIZE_MAX (maximum value of a png_size_t variable.
1465 Added check in png_malloc_default() for (size_t)size != (png_uint_32)size
1466 which would indicate an overflow.
1467 Changed sPLT failure action from png_error to png_warning and abandon chunk.
1468 Changed sCAL and iCCP failures from png_error to png_warning and abandon.
1469 Added png_get_uint_31(png_ptr, buf) function.
1470 Added PNG_UINT_32_MAX macro.
1471 Renamed PNG_MAX_UINT to PNG_UINT_31_MAX.
1472 Made png_zalloc() issue a png_warning and return NULL on potential
1473 overflow.
1474 Turn on PNG_NO_ZALLOC_ZERO by default in version 1.2.x
1475 Revised "clobber list" in pnggccrd.c so it will compile under gcc-3.4.
1476 Revised Borland portion of png_malloc() to return NULL or issue
1477 png_error() according to setting of PNG_FLAG_MALLOC_NULL_MEM_OK.
1478 Added PNG_NO_SEQUENTIAL_READ_SUPPORTED macro to conditionally remove
1479 sequential read support.
1480 Added some "#if PNG_WRITE_SUPPORTED" blocks.
1481 Added #ifdef to remove some redundancy in png_malloc_default().
1482 Use png_malloc instead of png_zalloc to allocate the pallete.
1483
1484 Version 1.0.16rc1 and 1.2.6rc1 [August 4, 2004]
1485 Fixed buffer overflow vulnerability (CVE-2004-0597) in png_handle_tRNS().
1486 Fixed NULL dereference vulnerability (CVE-2004-0598) in png_handle_iCCP().
1487 Fixed integer overflow vulnerability (CVE-2004-0599) in png_read_png().
1488 Fixed some harmless bugs in png_handle_sBIT, etc, that would cause
1489 duplicate chunk types to go undetected.
1490 Fixed some timestamps in the -config version
1491 Rearranged order of processing of color types in png_handle_tRNS().
1492 Added ROWBYTES macro to calculate rowbytes without integer overflow.
1493 Updated makefile.darwin and removed makefile.macosx from scripts directory.
1494 Imposed default one million column, one-million row limits on the image
1495 dimensions, and added png_set_user_limits() function to override them.
1496 Revised use of PNG_SET_USER_LIMITS_SUPPORTED macro.
1497 Fixed wrong cast of returns from png_get_user_width|height_max().
1498 Changed some "keep the compiler happy" from empty statements to returns,
1499 Revised libpng.txt to remove 1.2.x stuff from the 1.0.x distribution
1500
1501 Version 1.0.16rc2 and 1.2.6rc2 [August 7, 2004]
1502 Revised makefile.darwin and makefile.solaris. Removed makefile.macosx.
1503 Revised pngtest's png_debug_malloc() to use png_malloc() instead of
1504 png_malloc_default() which is not supposed to be exported.
1505 Fixed off-by-one error in one of the conversions to PNG_ROWBYTES() in
1506 pngpread.c. Bug was introduced in 1.2.6rc1.
1507 Fixed bug in RGB to RGBX transformation introduced in 1.2.6rc1.
1508 Fixed old bug in RGB to Gray transformation.
1509 Fixed problem with 64-bit compilers by casting arguments to abs()
1510 to png_int_32.
1511 Changed "ln -sf" to "ln -f -s" in three makefiles (solaris, sco, so9).
1512 Changed "HANDLE_CHUNK_*" to "PNG_HANDLE_CHUNK_*" (Cosmin)
1513 Added "-@/bin/rm -f $(DL)/$(LIBNAME).so.$(PNGMAJ)" to 15 *NIX makefiles.
1514 Added code to update the row_info->colortype in png_do_read_filler() (MSB).
1515
1516 Version 1.0.16rc3 and 1.2.6rc3 [August 9, 2004]
1517 Eliminated use of "abs()" in testing cHRM and gAMA values, to avoid
1518 trouble with some 64-bit compilers. Created PNG_OUT_OF_RANGE() macro.
1519 Revised documentation of png_set_keep_unknown_chunks().
1520 Check handle_as_unknown status in pngpread.c, as in pngread.c previously.
1521 Moved "PNG_HANDLE_CHUNK_*" macros out of PNG_INTERNAL section of png.h
1522 Added "rim" definitions for CONST4 and CONST6 in pnggccrd.c
1523
1524 Version 1.0.16rc4 and 1.2.6rc4 [August 10, 2004]
1525 Fixed mistake in pngtest.c introduced in 1.2.6rc2 (declaration of
1526 "pinfo" was out of place).
1527
1528 Version 1.0.16rc5 and 1.2.6rc5 [August 10, 2004]
1529 Moved "PNG_HANDLE_CHUNK_*" macros out of PNG_ASSEMBLER_CODE_SUPPORTED
1530 section of png.h where they were inadvertently placed in version rc3.
1531
1532 Version 1.2.6 and 1.0.16 [August 15, 2004]
1533 Revised pngtest so memory allocation testing is only done when PNG_DEBUG==1.
1534
1535 Version 1.2.7beta1 [August 26, 2004]
1536 Removed unused pngasmrd.h file.
1537 Removed references to uu.net for archived files. Added references to
1538 PNG Spec (second edition) and the PNG ISO/IEC Standard.
1539 Added "test-dd" target in 15 makefiles, to run pngtest in DESTDIR.
1540 Fixed bug with "optimized window size" in the IDAT datastream, that
1541 causes libpng to write PNG files with incorrect zlib header bytes.
1542
1543 Version 1.2.7beta2 [August 28, 2004]
1544 Fixed bug with sCAL chunk and big-endian machines (David Munro).
1545 Undid new code added in 1.2.6rc2 to update the color_type in
1546 png_set_filler().
1547 Added png_set_add_alpha() that updates color type.
1548
1549 Version 1.0.17rc1 and 1.2.7rc1 [September 4, 2004]
1550 Revised png_set_strip_filler() to not remove alpha if color_type has alpha.
1551
1552 Version 1.2.7 and 1.0.17 [September 12, 2004]
1553 Added makefile.hp64
1554 Changed projects/msvc/png32ms.def to scripts/png32ms.def in makefile.cygwin
1555
1556 Version 1.2.8beta1 [November 1, 2004]
1557 Fixed bug in png_text_compress() that would fail to complete a large block.
1558 Fixed bug, introduced in libpng-1.2.7, that overruns a buffer during
1559 strip alpha operation in png_do_strip_filler().
1560 Added PNG_1_2_X definition in pngconf.h
1561 Use #ifdef to comment out png_info_init in png.c and png_read_init in
1562 pngread.c (as of 1.3.0)
1563
1564 Version 1.2.8beta2 [November 2, 2004]
1565 Reduce color_type to a nonalpha type after strip alpha operation in
1566 png_do_strip_filler().
1567
1568 Version 1.2.8beta3 [November 3, 2004]
1569 Revised definitions of PNG_MAX_UINT_32, PNG_MAX_SIZE, and PNG_MAXSUM
1570
1571 Version 1.2.8beta4 [November 12, 2004]
1572 Fixed (again) definition of PNG_LIBPNG_VER_DLLNUM in png.h (Cosmin).
1573 Added PNG_LIBPNG_BUILD_PRIVATE in png.h (Cosmin).
1574 Set png_ptr->zstream.data_type to Z_BINARY, to avoid unnecessary detection
1575 of data type in deflate (Cosmin).
1576 Deprecated but continue to support SPECIALBUILD and PRIVATEBUILD in favor of
1577 PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
1578
1579 Version 1.2.8beta5 [November 20, 2004]
1580 Use png_ptr->flags instead of png_ptr->transformations to pass
1581 PNG_STRIP_ALPHA info to png_do_strip_filler(), to preserve ABI
1582 compatibility.
1583 Revised handling of SPECIALBUILD, PRIVATEBUILD,
1584 PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
1585
1586 Version 1.2.8rc1 [November 24, 2004]
1587 Moved handling of BUILD macros from pngconf.h to png.h
1588 Added definition of PNG_LIBPNG_BASE_TYPE in png.h, inadvertently
1589 omitted from beta5.
1590 Revised scripts/pngw32.rc
1591 Despammed mailing addresses by masking "@" with "at".
1592 Inadvertently installed a supposedly faster test version of pngrutil.c
1593
1594 Version 1.2.8rc2 [November 26, 2004]
1595 Added two missing "\" in png.h
1596 Change tests in pngread.c and pngpread.c to
1597 if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
1598 png_do_read_transformations(png_ptr);
1599
1600 Version 1.2.8rc3 [November 28, 2004]
1601 Reverted pngrutil.c to version libpng-1.2.8beta5.
1602 Added scripts/makefile.elf with supporting code in pngconf.h for symbol
1603 versioning (John Bowler).
1604
1605 Version 1.2.8rc4 [November 29, 2004]
1606 Added projects/visualc7 (Simon-pierre).
1607
1608 Version 1.2.8rc5 [November 29, 2004]
1609 Fixed new typo in scripts/pngw32.rc
1610
1611 Version 1.2.8 [December 3, 2004]
1612 Removed projects/visualc7, added projects/visualc71.
1613
1614 Version 1.2.9beta1 [February 21, 2006]
1615 Initialized some structure members in pngwutil.c to avoid gcc-4.0.0 complaints
1616 Revised man page and libpng.txt to make it clear that one should not call
1617 png_read_end or png_write_end after png_read_png or png_write_png.
1618 Updated references to png-mng-implement mailing list.
1619 Fixed an incorrect typecast in pngrutil.c
1620 Added PNG_NO_READ_SUPPORTED conditional for making a write-only library.
1621 Added PNG_NO_WRITE_INTERLACING_SUPPORTED conditional.
1622 Optimized alpha-inversion loops in pngwtran.c
1623 Moved test for nonzero gamma outside of png_build_gamma_table() in pngrtran.c
1624 Make sure num_trans is <= 256 before copying data in png_set_tRNS().
1625 Make sure num_palette is <= 256 before copying data in png_set_PLTE().
1626 Interchanged order of write_swap_alpha and write_invert_alpha transforms.
1627 Added parentheses in the definition of PNG_LIBPNG_BUILD_TYPE (Cosmin).
1628 Optimized zlib window flag (CINFO) in contrib/pngsuite/*.png (Cosmin).
1629 Updated scripts/makefile.bc32 for Borland C++ 5.6 (Cosmin).
1630 Exported png_get_uint_32, png_save_uint_32, png_get_uint_16, png_save_uint_16,
1631 png_get_int_32, png_save_int_32, png_get_uint_31 (Cosmin).
1632 Added type cast (png_byte) in png_write_sCAL() (Cosmin).
1633 Fixed scripts/makefile.cygwin (Christian Biesinger, Cosmin).
1634 Default iTXt support was inadvertently enabled.
1635
1636 Version 1.2.9beta2 [February 21, 2006]
1637 Check for png_rgb_to_gray and png_gray_to_rgb read transformations before
1638 checking for png_read_dither in pngrtran.c
1639 Revised checking of chromaticity limits to accommodate extended RGB
1640 colorspace (John Denker).
1641 Changed line endings in some of the project files to CRLF, even in the
1642 "Unix" tar distributions (Cosmin).
1643 Made png_get_int_32 and png_save_int_32 always available (Cosmin).
1644 Updated scripts/pngos2.def, scripts/pngw32.def and projects/wince/png32ce.def
1645 with the newly exported functions.
1646 Eliminated distributions without the "configure" script.
1647 Updated INSTALL instructions.
1648
1649 Version 1.2.9beta3 [February 24, 2006]
1650 Fixed CRCRLF line endings in contrib/visupng/VisualPng.dsp
1651 Made libpng.pc respect EXEC_PREFIX (D. P. Kreil, J. Bowler)
1652 Removed reference to pngasmrd.h from Makefile.am
1653 Renamed CHANGES to ChangeLog.
1654 Renamed LICENSE to COPYING.
1655 Renamed ANNOUNCE to NEWS.
1656 Created AUTHORS file.
1657
1658 Version 1.2.9beta4 [March 3, 2006]
1659 Changed definition of PKGCONFIG from $prefix/lib to $libdir in configure.ac
1660 Reverted to filenames LICENSE and ANNOUNCE; removed AUTHORS and COPYING.
1661 Removed newline from the end of some error and warning messages.
1662 Removed test for sqrt() from configure.ac and configure.
1663 Made swap tables in pngtrans.c PNG_CONST (Carlo Bramix).
1664 Disabled default iTXt support that was inadvertently enabled in
1665 libpng-1.2.9beta1.
1666 Added "OS2" to list of systems that don't need underscores, in pnggccrd.c
1667 Removed libpng version and date from *.c files.
1668
1669 Version 1.2.9beta5 [March 4, 2006]
1670 Removed trailing blanks from source files.
1671 Put version and date of latest change in each source file, and changed
1672 copyright year accordingly.
1673 More cleanup of configure.ac, Makefile.am, and associated scripts.
1674 Restored scripts/makefile.elf which was inadvertently deleted.
1675
1676 Version 1.2.9beta6 [March 6, 2006]
1677 Fixed typo (RELEASE) in configuration files.
1678
1679 Version 1.2.9beta7 [March 7, 2006]
1680 Removed libpng.vers and libpng.sym from libpng12_la_SOURCES in Makefile.am
1681 Fixed inconsistent #ifdef's around png_sig_bytes() and png_set_sCAL_s()
1682 in png.h.
1683 Updated makefile.elf as suggested by debian.
1684 Made cosmetic changes to some makefiles, adding LN_SF and other macros.
1685 Made some makefiles accept "exec_prefix".
1686
1687 Version 1.2.9beta8 [March 9, 2006]
1688 Fixed some "#if defined (..." which should be "#if defined(..."
1689 Bug introduced in libpng-1.2.8.
1690 Fixed inconsistency in definition of png_default_read_data()
1691 Restored blank that was lost from makefile.sggcc "clean" target in beta7.
1692 Revised calculation of "current" and "major" for irix in ltmain.sh
1693 Changed "mkdir" to "MKDIR_P" in some makefiles.
1694 Separated PNG_EXPAND and PNG_EXPAND_tRNS.
1695 Added png_set_expand_gray_1_2_4_to_8() and deprecated
1696 png_set_gray_1_2_4_to_8() which also expands tRNS to alpha.
1697
1698 Version 1.2.9beta9 [March 10, 2006]
1699 Include "config.h" in pngconf.h when available.
1700 Added some checks for NULL png_ptr or NULL info_ptr (timeless)
1701
1702 Version 1.2.9beta10 [March 20, 2006]
1703 Removed extra CR from contrib/visualpng/VisualPng.dsw (Cosmin)
1704 Made pnggccrd.c PIC-compliant (Christian Aichinger).
1705 Added makefile.mingw (Wolfgang Glas).
1706 Revised pngconf.h MMX checking.
1707
1708 Version 1.2.9beta11 [March 22, 2006]
1709 Fixed out-of-order declaration in pngwrite.c that was introduced in beta9
1710 Simplified some makefiles by using LIBSO, LIBSOMAJ, and LIBSOVER macros.
1711
1712 Version 1.2.9rc1 [March 31, 2006]
1713 Defined PNG_USER_PRIVATEBUILD when including "pngusr.h" (Cosmin).
1714 Removed nonsensical assertion check from pngtest.c (Cosmin).
1715
1716 Version 1.2.9 [April 14, 2006]
1717 Revised makefile.beos and added "none" selector in ltmain.sh
1718
1719 Version 1.2.10beta1 [April 15, 2006]
1720 Renamed "config.h" to "png_conf.h" and revised Makefile.am to add
1721 -DPNG_BUILDING_LIBPNG to compile directive, and modified pngconf.h
1722 to include png_conf.h only when PNG_BUILDING_LIBPNG is defined.
1723
1724 Version 1.2.10beta2 [April 15, 2006]
1725 Manually updated Makefile.in and configure. Changed png_conf.h.in
1726 back to config.h.
1727
1728 Version 1.2.10beta3 [April 15, 2006]
1729 Change png_conf.h back to config.h in pngconf.h.
1730
1731 Version 1.2.10beta4 [April 16, 2006]
1732 Change PNG_BUILDING_LIBPNG to PNG_CONFIGURE_LIBPNG in config/Makefile*.
1733
1734 Version 1.2.10beta5 [April 16, 2006]
1735 Added a configure check for compiling assembler code in pnggccrd.c
1736
1737 Version 1.2.10beta6 [April 17, 2006]
1738 Revised the configure check for pnggccrd.c
1739 Moved -DPNG_CONFIGURE_LIBPNG into @LIBPNG_DEFINES@
1740 Added @LIBPNG_DEFINES@ to arguments when building libpng.sym
1741
1742 Version 1.2.10beta7 [April 18, 2006]
1743 Change "exec_prefix=$prefix" to "exec_prefix=$(prefix)" in makefiles.
1744
1745 Version 1.2.10rc1 [April 19, 2006]
1746 Ensure pngconf.h doesn't define both PNG_USE_PNGGCCRD and PNG_USE_PNGVCRD
1747 Fixed "LN_FS" typo in makefile.sco and makefile.solaris.
1748
1749 Version 1.2.10rc2 [April 20, 2006]
1750 Added a backslash between -DPNG_CONFIGURE_LIBPNG and -DPNG_NO_ASSEMBLER_CODE
1751 in configure.ac and configure
1752 Made the configure warning about versioned symbols less arrogant.
1753
1754 Version 1.2.10rc3 [April 21, 2006]
1755 Added a note in libpng.txt that png_set_sig_bytes(8) can be used when
1756 writing an embedded PNG without the 8-byte signature.
1757 Revised makefiles and configure to avoid making links to libpng.so.*
1758
1759 Version 1.2.10 [April 23, 2006]
1760 Reverted configure to "rc2" state.
1761
1762 Version 1.2.11beta1 [May 31, 2006]
1763 scripts/libpng.pc.in contained "configure" style version info and would
1764 not work with makefiles.
1765 The shared-library makefiles were linking to libpng.so.0 instead of
1766 libpng.so.3 compatibility as the library.
1767
1768 Version 1.2.11beta2 [June 2, 2006]
1769 Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
1770 buffer overflow.
1771 Fixed bug in example.c (png_set_palette_rgb -> png_set_palette_to_rgb)
1772
1773 Version 1.2.11beta3 [June 5, 2006]
1774 Prepended "#! /bin/sh" to ltmail.sh and contrib/pngminus/*.sh (Cosmin).
1775 Removed the accidental leftover Makefile.in~ (Cosmin).
1776 Avoided potential buffer overflow and optimized buffer in
1777 png_write_sCAL(), png_write_sCAL_s() (Cosmin).
1778 Removed the include directories and libraries from CFLAGS and LDFLAGS
1779 in scripts/makefile.gcc (Nelson A. de Oliveira, Cosmin).
1780
1781 Version 1.2.11beta4 [June 6, 2006]
1782 Allow zero-length IDAT chunks after the entire zlib datastream, but not
1783 after another intervening chunk type.
1784
1785 Version 1.0.19rc1, 1.2.11rc1 [June 13, 2006]
1786 Deleted extraneous square brackets from [config.h] in configure.ac
1787
1788 Version 1.0.19rc2, 1.2.11rc2 [June 14, 2006]
1789 Added prototypes for PNG_INCH_CONVERSIONS functions to png.h
1790 Revised INSTALL and autogen.sh
1791 Fixed typo in several makefiles (-W1 should be -Wl)
1792 Added typedef for png_int_32 and png_uint_32 on 64-bit systems.
1793
1794 Version 1.0.19rc3, 1.2.11rc3 [June 15, 2006]
1795 Removed the new typedefs for 64-bit systems (delay until version 1.4.0)
1796 Added one zero element to png_gamma_shift[] array in pngrtran.c to avoid
1797 reading out of bounds.
1798
1799 Version 1.0.19rc4, 1.2.11rc4 [June 15, 2006]
1800 Really removed the new typedefs for 64-bit systems.
1801
1802 Version 1.0.19rc5, 1.2.11rc5 [June 22, 2006]
1803 Removed png_sig_bytes entry from scripts/pngw32.def
1804
1805 Version 1.0.19, 1.2.11 [June 26, 2006]
1806 None.
1807
1808 Version 1.0.20, 1.2.12 [June 27, 2006]
1809 Really increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
1810 buffer overflow.
1811
1812 Version 1.2.13beta1 [October 2, 2006]
1813 Removed AC_FUNC_MALLOC from configure.ac
1814 Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h
1815 Change "logical" to "bitwise" throughout documentation.
1816 Detect and fix attempt to write wrong iCCP profile length (CVE-2006-7244)
1817
1818 Version 1.0.21, 1.2.13 [November 14, 2006]
1819 Fix potential buffer overflow in sPLT chunk handler.
1820 Fix Makefile.am to not try to link to noexistent files.
1821 Check all exported functions for NULL png_ptr.
1822
1823 Version 1.2.14beta1 [November 17, 2006]
1824 Relocated three misplaced tests for NULL png_ptr.
1825 Built Makefile.in with automake-1.9.6 instead of 1.9.2.
1826 Build configure with autoconf-2.60 instead of 2.59
1827
1828 Version 1.2.14beta2 [November 17, 2006]
1829 Added some typecasts in png_zalloc().
1830
1831 Version 1.2.14rc1 [November 20, 2006]
1832 Changed "strtod" to "png_strtod" in pngrutil.c
1833
1834 Version 1.0.22, 1.2.14 [November 27, 2006]
1835 Added missing "$(srcdir)" in Makefile.am and Makefile.in
1836
1837 Version 1.2.15beta1 [December 3, 2006]
1838 Generated configure with autoconf-2.61 instead of 2.60
1839 Revised configure.ac to update libpng.pc and libpng-config.
1840
1841 Version 1.2.15beta2 [December 3, 2006]
1842 Always export MMX asm functions, just stubs if not building pnggccrd.c
1843
1844 Version 1.2.15beta3 [December 4, 2006]
1845 Add "png_bytep" typecast to profile while calculating length in pngwutil.c
1846
1847 Version 1.2.15beta4 [December 7, 2006]
1848 Added scripts/CMakeLists.txt
1849 Changed PNG_NO_ASSEMBLER_CODE to PNG_NO_MMX_CODE in scripts, like 1.4.0beta
1850
1851 Version 1.2.15beta5 [December 7, 2006]
1852 Changed some instances of PNG_ASSEMBLER_* to PNG_MMX_* in pnggccrd.c
1853 Revised scripts/CMakeLists.txt
1854
1855 Version 1.2.15beta6 [December 13, 2006]
1856 Revised scripts/CMakeLists.txt and configure.ac
1857
1858 Version 1.2.15rc1 [December 18, 2006]
1859 Revised scripts/CMakeLists.txt
1860
1861 Version 1.2.15rc2 [December 21, 2006]
1862 Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers.
1863 Added scripts/makefile.nommx
1864
1865 Version 1.2.15rc3 [December 25, 2006]
1866 Fixed shared library numbering error that was introduced in 1.2.15beta6.
1867
1868 Version 1.2.15rc4 [December 27, 2006]
1869 Fixed handling of rgb_to_gray when png_ptr->color.gray isn't set.
1870
1871 Version 1.2.15rc5 [December 31, 2006]
1872 Revised handling of rgb_to_gray.
1873
1874 Version 1.2.15 [January 5, 2007]
1875 Added some (unsigned long) typecasts in pngtest.c to avoid printing errors.
1876
1877 Version 1.2.16beta1 [January 6, 2007]
1878 Fix bugs in makefile.nommx
1879
1880 Version 1.2.16beta2 [January 16, 2007]
1881 Revised scripts/CMakeLists.txt
1882
1883 Version 1.2.16 [January 31, 2007]
1884 No changes.
1885
1886 Version 1.2.17beta1 [March 6, 2007]
1887 Revised scripts/CMakeLists.txt to install both shared and static libraries.
1888 Deleted a redundant line from pngset.c.
1889
1890 Version 1.2.17beta2 [April 26, 2007]
1891 Relocated misplaced test for png_ptr == NULL in pngpread.c
1892 Change "==" to "&" for testing PNG_RGB_TO_GRAY_ERR & PNG_RGB_TO_GRAY_WARN
1893 flags.
1894 Changed remaining instances of PNG_ASSEMBLER_* to PNG_MMX_*
1895 Added pngerror() when write_IHDR fails in deflateInit2().
1896 Added "const" to some array declarations.
1897 Mention examples of libpng usage in the libpng*.txt and libpng.3 documents.
1898
1899 Version 1.2.17rc1 [May 4, 2007]
1900 No changes.
1901
1902 Version 1.2.17rc2 [May 8, 2007]
1903 Moved several PNG_HAVE_* macros out of PNG_INTERNAL because applications
1904 calling set_unknown_chunk_location() need them.
1905 Changed transformation flag from PNG_EXPAND_tRNS to PNG_EXPAND in
1906 png_set_expand_gray_1_2_4_to_8().
1907 Added png_ptr->unknown_chunk to hold working unknown chunk data, so it
1908 can be free'ed in case of error. Revised unknown chunk handling in
1909 pngrutil.c and pngpread.c to use this structure.
1910
1911 Version 1.2.17rc3 [May 8, 2007]
1912 Revised symbol-handling in configure script.
1913
1914 Version 1.2.17rc4 [May 10, 2007]
1915 Revised unknown chunk handling to avoid storing unknown critical chunks.
1916
1917 Version 1.0.25 [May 15, 2007]
1918 Version 1.2.17 [May 15, 2007]
1919 Added "png_ptr->num_trans=0" before error return in png_handle_tRNS,
1920 to eliminate a vulnerability (CVE-2007-2445, CERT VU#684664)
1921
1922 Version 1.0.26 [May 15, 2007]
1923 Version 1.2.18 [May 15, 2007]
1924 Reverted the libpng-1.2.17rc3 change to symbol-handling in configure script
1925
1926 Version 1.2.19beta1 [May 18, 2007]
1927 Changed "const static" to "static PNG_CONST" everywhere, mostly undoing
1928 change of libpng-1.2.17beta2. Changed other "const" to "PNG_CONST"
1929 Changed some handling of unused parameters, to avoid compiler warnings.
1930 "if (unused == NULL) return;" becomes "unused = unused".
1931
1932 Version 1.2.19beta2 [May 18, 2007]
1933 Only use the valid bits of tRNS value in png_do_expand() (Brian Cartier)
1934
1935 Version 1.2.19beta3 [May 19, 2007]
1936 Add some "png_byte" typecasts in png_check_keyword() and write new_key
1937 instead of key in zTXt chunk (Kevin Ryde).
1938
1939 Version 1.2.19beta4 [May 21, 2007]
1940 Add png_snprintf() function and use it in place of sprint() for improved
1941 defense against buffer overflows.
1942
1943 Version 1.2.19beta5 [May 21, 2007]
1944 Fixed png_handle_tRNS() to only use the valid bits of tRNS value.
1945 Changed handling of more unused parameters, to avoid compiler warnings.
1946 Removed some PNG_CONST in pngwutil.c to avoid compiler warnings.
1947
1948 Version 1.2.19beta6 [May 22, 2007]
1949 Added some #ifdef PNG_MMX_CODE_SUPPORTED where needed in pngvcrd.c
1950 Added a special "_MSC_VER" case that defines png_snprintf to _snprintf
1951
1952 Version 1.2.19beta7 [May 22, 2007]
1953 Squelched png_squelch_warnings() in pnggccrd.c and added
1954 an #ifdef PNG_MMX_CODE_SUPPORTED block around the declarations that caused
1955 the warnings that png_squelch_warnings was squelching.
1956
1957 Version 1.2.19beta8 [May 22, 2007]
1958 Removed __MMX__ from test in pngconf.h.
1959
1960 Version 1.2.19beta9 [May 23, 2007]
1961 Made png_squelch_warnings() available via PNG_SQUELCH_WARNINGS macro.
1962 Revised png_squelch_warnings() so it might work.
1963 Updated makefile.sgcc and makefile.solaris; added makefile.solaris-x86.
1964
1965 Version 1.2.19beta10 [May 24, 2007]
1966 Resquelched png_squelch_warnings(), use "__attribute__((used))" instead.
1967
1968 Version 1.4.0beta1 [April 20, 2006]
1969 Enabled iTXt support (changes png_struct, thus requires so-number change).
1970 Cleaned up PNG_ASSEMBLER_CODE_SUPPORTED vs PNG_MMX_CODE_SUPPORTED
1971 Eliminated PNG_1_0_X and PNG_1_2_X macros.
1972 Removed deprecated functions png_read_init, png_write_init, png_info_init,
1973 png_permit_empty_plte, png_set_gray_1_2_4_to_8, png_check_sig, and
1974 removed the deprecated macro PNG_MAX_UINT.
1975 Moved "PNG_INTERNAL" parts of png.h and pngconf.h into pngintrn.h
1976 Removed many WIN32_WCE #ifdefs (Cosmin).
1977 Reduced dependency on C-runtime library when on Windows (Simon-Pierre)
1978 Replaced sprintf() with png_sprintf() (Simon-Pierre)
1979
1980 Version 1.4.0beta2 [April 20, 2006]
1981 Revised makefiles and configure to avoid making links to libpng.so.*
1982 Moved some leftover MMX-related defines from pngconf.h to pngintrn.h
1983 Updated scripts/pngos2.def, pngw32.def, and projects/wince/png32ce.def
1984
1985 Version 1.4.0beta3 [May 10, 2006]
1986 Updated scripts/pngw32.def to comment out MMX functions.
1987 Added PNG_NO_GET_INT_32 and PNG_NO_SAVE_INT_32 macros.
1988 Scripts/libpng.pc.in contained "configure" style version info and would
1989 not work with makefiles.
1990 Revised pngconf.h and added pngconf.h.in, so makefiles and configure can
1991 pass defines to libpng and applications.
1992
1993 Version 1.4.0beta4 [May 11, 2006]
1994 Revised configure.ac, Makefile.am, and many of the makefiles to write
1995 their defines in pngconf.h.
1996
1997 Version 1.4.0beta5 [May 15, 2006]
1998 Added a missing semicolon in Makefile.am and Makefile.in
1999 Deleted extraneous square brackets from configure.ac
2000
2001 Version 1.4.0beta6 [June 2, 2006]
2002 Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
2003 buffer overflow.
2004 Changed sonum from 0 to 1.
2005 Removed unused prototype for png_check_sig() from png.h
2006
2007 Version 1.4.0beta7 [June 16, 2006]
2008 Exported png_write_sig (Cosmin).
2009 Optimized buffer in png_handle_cHRM() (Cosmin).
2010 Set pHYs = 2835 x 2835 pixels per meter, and added
2011 sCAL = 0.352778e-3 x 0.352778e-3 meters, in pngtest.png (Cosmin).
2012 Added png_set_benign_errors(), png_benign_error(), png_chunk_benign_error().
2013 Added typedef for png_int_32 and png_uint_32 on 64-bit systems.
2014 Added "(unsigned long)" typecast on png_uint_32 variables in printf lists.
2015
2016 Version 1.4.0beta8 [June 22, 2006]
2017 Added demonstration of user chunk support in pngtest.c, to support the
2018 public sTER chunk and a private vpAg chunk.
2019
2020 Version 1.4.0beta9 [July 3, 2006]
2021 Removed ordinals from scripts/pngw32.def and removed png_info_int and
2022 png_set_gray_1_2_4_to_8 entries.
2023 Inline call of png_get_uint_32() in png_get_uint_31().
2024 Use png_get_uint_31() to get vpAg width and height in pngtest.c
2025 Removed WINCE and Netware projects.
2026 Removed standalone Y2KINFO file.
2027
2028 Version 1.4.0beta10 [July 12, 2006]
2029 Eliminated automatic copy of pngconf.h to pngconf.h.in from configure and
2030 some makefiles, because it was not working reliably. Instead, distribute
2031 pngconf.h.in along with pngconf.h and cause configure and some of the
2032 makefiles to update pngconf.h from pngconf.h.in.
2033 Added pngconf.h to DEPENDENCIES in Makefile.am
2034
2035 Version 1.4.0beta11 [August 19, 2006]
2036 Removed AC_FUNC_MALLOC from configure.ac.
2037 Added a warning when writing iCCP profile with mismatched profile length.
2038 Patched pnggccrd.c to assemble on x86_64 platforms.
2039 Moved chunk header reading into a separate function png_read_chunk_header()
2040 in pngrutil.c. The chunk header (len+sig) is now serialized in a single
2041 operation (Cosmin).
2042 Implemented support for I/O states. Added png_ptr member io_state, and
2043 functions png_get_io_chunk_name() and png_get_io_state() in pngget.c
2044 (Cosmin).
2045 Added png_get_io_chunk_name and png_get_io_state to scripts/*.def (Cosmin).
2046 Renamed scripts/pngw32.* to scripts/pngwin.* (Cosmin).
2047 Removed the include directories and libraries from CFLAGS and LDFLAGS
2048 in scripts/makefile.gcc (Cosmin).
2049 Used png_save_uint_32() to set vpAg width and height in pngtest.c (Cosmin).
2050 Cast to proper type when getting/setting vpAg units in pngtest.c (Cosmin).
2051 Added pngintrn.h to the Visual C++ projects (Cosmin).
2052 Removed scripts/list (Cosmin).
2053 Updated copyright year in scripts/pngwin.def (Cosmin).
2054 Removed PNG_TYPECAST_NULL and used standard NULL consistently (Cosmin).
2055 Disallowed the user to redefine png_size_t, and enforced a consistent use
2056 of png_size_t across libpng (Cosmin).
2057 Changed the type of png_ptr->rowbytes, PNG_ROWBYTES() and friends
2058 to png_size_t (Cosmin).
2059 Removed png_convert_size() and replaced png_sizeof with sizeof (Cosmin).
2060 Removed some unnecessary type casts (Cosmin).
2061 Changed prototype of png_get_compression_buffer_size() and
2062 png_set_compression_buffer_size() to work with png_size_t instead of
2063 png_uint_32 (Cosmin).
2064 Removed png_memcpy_check() and png_memset_check() (Cosmin).
2065 Fixed a typo (png_byte --> png_bytep) in libpng.3 and libpng.txt (Cosmin).
2066 Clarified that png_zalloc() does not clear the allocated memory,
2067 and png_zalloc() and png_zfree() cannot be PNGAPI (Cosmin).
2068 Renamed png_mem_size_t to png_alloc_size_t, fixed its definition in
2069 pngconf.h, and used it in all memory allocation functions (Cosmin).
2070 Renamed pngintrn.h to pngpriv.h, added a comment at the top of the file
2071 mentioning that the symbols declared in that file are private, and
2072 updated the scripts and the Visual C++ projects accordingly (Cosmin).
2073 Removed circular references between pngconf.h and pngconf.h.in in
2074 scripts/makefile.vc*win32 (Cosmin).
2075 Removing trailing '.' from the warning and error messages (Cosmin).
2076 Added pngdefs.h that is built by makefile or configure, instead of
2077 pngconf.h.in (Glenn).
2078 Detect and fix attempt to write wrong iCCP profile length.
2079
2080 Version 1.4.0beta12 [October 19, 2006]
2081 Changed "logical" to "bitwise" in the documentation.
2082 Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h
2083 Add a typecast to stifle compiler warning in pngrutil.c
2084
2085 Version 1.4.0beta13 [November 10, 2006]
2086 Fix potential buffer overflow in sPLT chunk handler.
2087 Fix Makefile.am to not try to link to noexistent files.
2088
2089 Version 1.4.0beta14 [November 15, 2006]
2090 Check all exported functions for NULL png_ptr.
2091
2092 Version 1.4.0beta15 [November 17, 2006]
2093 Relocated two misplaced tests for NULL png_ptr.
2094 Built Makefile.in with automake-1.9.6 instead of 1.9.2.
2095 Build configure with autoconf-2.60 instead of 2.59
2096 Add "install: all" in Makefile.am so "configure; make install" will work.
2097
2098 Version 1.4.0beta16 [November 17, 2006]
2099 Added a typecast in png_zalloc().
2100
2101 Version 1.4.0beta17 [December 4, 2006]
2102 Changed "new_key[79] = '\0';" to "(*new_key)[79] = '\0';" in pngwutil.c
2103 Add "png_bytep" typecast to profile while calculating length in pngwutil.c
2104
2105 Version 1.4.0beta18 [December 7, 2006]
2106 Added scripts/CMakeLists.txt
2107
2108 Version 1.4.0beta19 [May 16, 2007]
2109 Revised scripts/CMakeLists.txt
2110 Rebuilt configure and Makefile.in with newer tools.
2111 Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers.
2112 Added scripts/makefile.nommx
2113
2114 Version 1.4.0beta20 [July 9, 2008]
2115 Moved several PNG_HAVE_* macros from pngpriv.h to png.h because applications
2116 calling set_unknown_chunk_location() need them.
2117 Moved several macro definitions from pngpriv.h to pngconf.h
2118 Merge with changes to the 1.2.X branch, as of 1.2.30beta04.
2119 Deleted all use of the MMX assembler code and Intel-licensed optimizations.
2120 Revised makefile.mingw
2121
2122 Version 1.4.0beta21 [July 21, 2008]
2123 Moved local array "chunkdata" from pngrutil.c to the png_struct, so
2124 it will be freed by png_read_destroy() in case of a read error (Kurt
2125 Christensen).
2126
2127 Version 1.4.0beta22 [July 21, 2008]
2128 Change "purpose" and "buffer" to png_ptr->chunkdata to avoid memory leaking.
2129
2130 Version 1.4.0beta23 [July 22, 2008]
2131 Change "chunkdata = NULL" to "png_ptr->chunkdata = NULL" several places in
2132 png_decompress_chunk().
2133
2134 Version 1.4.0beta24 [July 25, 2008]
2135 Change all remaining "chunkdata" to "png_ptr->chunkdata" in
2136 png_decompress_chunk(), and remove "chunkdata" from parameter list.
2137 Put a call to png_check_chunk_name() in png_read_chunk_header().
2138 Revised png_check_chunk_name() to reject a name with a lowercase 3rd byte.
2139 Removed two calls to png_check_chunk_name() occurring later in the process.
2140 Define PNG_NO_ERROR_NUMBERS by default in pngconf.h
2141
2142 Version 1.4.0beta25 [July 30, 2008]
2143 Added a call to png_check_chunk_name() in pngpread.c
2144 Reverted png_check_chunk_name() to accept a name with a lowercase 3rd byte.
2145 Added png_push_have_buffer() function to pngpread.c
2146 Eliminated PNG_BIG_ENDIAN_SUPPORTED and associated png_get_* macros.
2147 Made inline expansion of png_get_*() optional with PNG_USE_READ_MACROS.
2148 Eliminated all PNG_USELESS_TESTS and PNG_CORRECT_PALETTE_SUPPORTED code.
2149 Synced contrib directory and configure files with libpng-1.2.30beta06.
2150 Eliminated no-longer-used pngdefs.h (but it's still built in the makefiles)
2151 Relocated a misplaced "#endif /* PNG_NO_WRITE_FILTER */" in pngwutil.c
2152
2153 Version 1.4.0beta26 [August 4, 2008]
2154 Removed png_push_have_buffer() function in pngpread.c. It increased the
2155 compiled library size slightly.
2156 Changed "-Wall" to "-W -Wall" in the CFLAGS in all makefiles (Cosmin Truta)
2157 Declared png_ptr "volatile" in pngread.c and pngwrite.c to avoid warnings.
2158 Updated contrib/visupng/cexcept.h to version 2.0.1
2159 Added PNG_LITERAL_CHARACTER macros for #, [, and ].
2160
2161 Version 1.4.0beta27 [August 5, 2008]
2162 Revised usage of PNG_LITERAL_SHARP in pngerror.c.
2163 Moved newline character from individual png_debug messages into the
2164 png_debug macros.
2165 Allow user to #define their own png_debug, png_debug1, and png_debug2.
2166
2167 Version 1.4.0beta28 [August 5, 2008]
2168 Revised usage of PNG_LITERAL_SHARP in pngerror.c.
2169 Added PNG_STRING_NEWLINE macro
2170
2171 Version 1.4.0beta29 [August 9, 2008]
2172 Revised usage of PNG_STRING_NEWLINE to work on non-ISO compilers.
2173 Added PNG_STRING_COPYRIGHT macro.
2174 Added non-ISO versions of png_debug macros.
2175
2176 Version 1.4.0beta30 [August 14, 2008]
2177 Added premultiplied alpha feature (Volker Wiendl).
2178
2179 Version 1.4.0beta31 [August 18, 2008]
2180 Moved png_set_premultiply_alpha from pngtrans.c to pngrtran.c
2181 Removed extra crc check at the end of png_handle_cHRM(). Bug introduced
2182 in libpng-1.4.0beta20.
2183
2184 Version 1.4.0beta32 [August 19, 2008]
2185 Added PNG_WRITE_FLUSH_SUPPORTED block around new png_flush() call.
2186 Revised PNG_NO_STDIO version of png_write_flush()
2187
2188 Version 1.4.0beta33 [August 20, 2008]
2189 Added png_get|set_chunk_cache_max() to limit the total number of sPLT,
2190 text, and unknown chunks that can be stored.
2191
2192 Version 1.4.0beta34 [September 6, 2008]
2193 Shortened tIME_string to 29 bytes in pngtest.c
2194 Fixed off-by-one error introduced in png_push_read_zTXt() function in
2195 libpng-1.2.30beta04/pngpread.c (Harald van Dijk)
2196
2197 Version 1.4.0beta35 [October 6, 2008]
2198 Changed "trans_values" to "trans_color".
2199 Changed so-number from 0 to 14. Some OS do not like 0.
2200 Revised makefile.darwin to fix shared library numbering.
2201 Change png_set_gray_1_2_4_to_8() to png_set_expand_gray_1_2_4_to_8()
2202 in example.c (debian bug report)
2203
2204 Version 1.4.0beta36 [October 25, 2008]
2205 Sync with tEXt vulnerability fix in libpng-1.2.33rc02.
2206
2207 Version 1.4.0beta37 [November 13, 2008]
2208 Added png_check_cHRM in png.c and moved checking from pngget.c, pngrutil.c,
2209 and pngwrite.c
2210
2211 Version 1.4.0beta38 [November 22, 2008]
2212 Added check for zero-area RGB cHRM triangle in png_check_cHRM() and
2213 png_check_cHRM_fixed().
2214
2215 Version 1.4.0beta39 [November 23, 2008]
2216 Revised png_warning() to write its message on standard output by default
2217 when warning_fn is NULL.
2218
2219 Version 1.4.0beta40 [November 24, 2008]
2220 Eliminated png_check_cHRM(). Instead, always use png_check_cHRM_fixed().
2221 In png_check_cHRM_fixed(), ensure white_y is > 0, and removed redundant
2222 check for all-zero coordinates that is detected by the triangle check.
2223
2224 Version 1.4.0beta41 [November 26, 2008]
2225 Fixed string vs pointer-to-string error in png_check_keyword().
2226 Rearranged test expressions in png_check_cHRM_fixed() to avoid internal
2227 overflows.
2228 Added PNG_NO_CHECK_cHRM conditional.
2229
2230 Version 1.4.0beta42, 43 [December 1, 2008]
2231 Merge png_debug with version 1.2.34beta04.
2232
2233 Version 1.4.0beta44 [December 6, 2008]
2234 Removed redundant check for key==NULL before calling png_check_keyword()
2235 to ensure that new_key gets initialized and removed extra warning
2236 (Merge with version 1.2.34beta05 -- Arvan Pritchard).
2237
2238 Version 1.4.0beta45 [December 9, 2008]
2239 In png_write_png(), respect the placement of the filler bytes in an earlier
2240 call to png_set_filler() (Jim Barry).
2241
2242 Version 1.4.0beta46 [December 10, 2008]
2243 Undid previous change and added PNG_TRANSFORM_STRIP_FILLER_BEFORE and
2244 PNG_TRANSFORM_STRIP_FILLER_AFTER conditionals and deprecated
2245 PNG_TRANSFORM_STRIP_FILLER (Jim Barry).
2246
2247 Version 1.4.0beta47 [December 15, 2008]
2248 Support for dithering was disabled by default, because it has never
2249 been well tested and doesn't work very well. The code has not
2250 been removed, however, and can be enabled by building libpng with
2251 PNG_READ_DITHER_SUPPORTED defined.
2252
2253 Version 1.4.0beta48 [February 14, 2009]
2254 Added new exported function png_calloc().
2255 Combined several instances of png_malloc(); png_memset() into png_calloc().
2256 Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24
2257 but was never defined.
2258
2259 Version 1.4.0beta49 [February 28, 2009]
2260 Added png_fileno() macro to pngconf.h, used in pngwio.c
2261 Corrected order of #ifdef's in png_debug definition in png.h
2262 Fixed bug introduced in libpng-1.4.0beta48 with the memset arguments
2263 for pcal_params.
2264 Fixed order of #ifdef directives in the png_debug defines in png.h
2265 (bug introduced in libpng-1.2.34/1.4.0beta29).
2266 Revised comments in png_set_read_fn() and png_set_write_fn().
2267
2268 Version 1.4.0beta50 [March 18, 2009]
2269 Use png_calloc() instead of png_malloc() to allocate big_row_buf when
2270 reading an interlaced file, to avoid a possible UMR.
2271 Undid revision of PNG_NO_STDIO version of png_write_flush(). Users
2272 having trouble with fflush() can build with PNG_NO_WRITE_FLUSH defined
2273 or supply their own flush_fn() replacement.
2274 Revised libpng*.txt and png.h documentation about use of png_write_flush()
2275 and png_set_write_fn().
2276 Removed fflush() from pngtest.c.
2277 Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
2278
2279 Version 1.4.0beta51 [March 21, 2009]
2280 Removed new png_fileno() macro from pngconf.h .
2281
2282 Version 1.4.0beta52 [March 27, 2009]
2283 Relocated png_do_chop() ahead of building gamma tables in pngrtran.c
2284 This avoids building 16-bit gamma tables unnecessarily.
2285 Removed fflush() from pngtest.c.
2286 Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
2287 Added a section on differences between 1.0.x and 1.2.x to libpng.3/libpng.txt
2288
2289 Version 1.4.0beta53 [April 1, 2009]
2290 Removed some remaining MMX macros from pngpriv.h
2291 Fixed potential memory leak of "new_name" in png_write_iCCP() (Ralph Giles)
2292
2293 Version 1.4.0beta54 [April 13, 2009]
2294 Added "ifndef PNG_SKIP_SETJMP_CHECK" block in pngconf.h to allow
2295 application code writers to bypass the check for multiple inclusion
2296 of setjmp.h when they know that it is safe to ignore the situation.
2297 Eliminated internal use of setjmp() in pngread.c and pngwrite.c
2298 Reordered ancillary chunks in pngtest.png to be the same as what
2299 pngtest now produces, and made some cosmetic changes to pngtest output.
2300 Eliminated deprecated png_read_init_3() and png_write_init_3() functions.
2301
2302 Version 1.4.0beta55 [April 15, 2009]
2303 Simplified error handling in pngread.c and pngwrite.c by putting
2304 the new png_read_cleanup() and png_write_cleanup() functions inline.
2305
2306 Version 1.4.0beta56 [April 25, 2009]
2307 Renamed "user_chunk_data" to "my_user_chunk_data" in pngtest.c to suppress
2308 "shadowed declaration" warning from gcc-4.3.3.
2309 Renamed "gamma" to "png_gamma" in pngset.c to avoid "shadowed declaration"
2310 warning about a global "gamma" variable in math.h on some platforms.
2311
2312 Version 1.4.0beta57 [May 2, 2009]
2313 Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24
2314 but was never defined (again).
2315 Rebuilt configure scripts with autoconf-2.63 instead of 2.62
2316 Removed pngprefs.h and MMX from makefiles
2317
2318 Version 1.4.0beta58 [May 14, 2009]
2319 Changed pngw32.def to pngwin.def in makefile.mingw (typo was introduced
2320 in beta57).
2321 Clarified usage of sig_bit versus sig_bit_p in example.c (Vincent Torri)
2322
2323 Version 1.4.0beta59 [May 15, 2009]
2324 Reformated sources in libpng style (3-space intentation, comment format)
2325 Fixed typo in libpng docs (PNG_FILTER_AVE should be PNG_FILTER_AVG)
2326 Added sections about the git repository and our coding style to the
2327 documentation
2328 Relocated misplaced #endif in pngwrite.c, sCAL chunk handler.
2329
2330 Version 1.4.0beta60 [May 19, 2009]
2331 Conditionally compile png_read_finish_row() which is not used by
2332 progressive readers.
2333 Added contrib/pngminim/preader to demonstrate building minimal progressive
2334 decoder, based on contrib/gregbook with embedded libpng and zlib.
2335
2336 Version 1.4.0beta61 [May 20, 2009]
2337 In contrib/pngminim/*, renamed "makefile.std" to "makefile", since there
2338 is only one makefile in those directories, and revised the README files
2339 accordingly.
2340 More reformatting of comments, mostly to capitalize sentences.
2341
2342 Version 1.4.0beta62 [June 2, 2009]
2343 Added "#define PNG_NO_WRITE_SWAP" to contrib/pngminim/encoder/pngusr.h
2344 and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h
2345 Reformatted several remaining "else statement" into two lines.
2346 Added a section to the libpng documentation about using png_get_io_ptr()
2347 in configure scripts to detect the presence of libpng.
2348
2349 Version 1.4.0beta63 [June 15, 2009]
2350 Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR()
2351 multiple times and to specify the sample order in the tRNS chunk,
2352 because the ISO PNG specification has a typo in the tRNS table.
2353 Changed several PNG_UNKNOWN_CHUNK_SUPPORTED to
2354 PNG_HANDLE_AS_UNKNOWN_SUPPORTED, to make the png_set_keep mechanism
2355 available for ignoring known chunks even when not saving unknown chunks.
2356 Adopted preference for consistent use of "#ifdef" and "#ifndef" versus
2357 "#if defined()" and "if !defined()" where possible.
2358
2359 Version 1.4.0beta64 [June 24, 2009]
2360 Eliminated PNG_LEGACY_SUPPORTED code.
2361 Moved the various unknown chunk macro definitions outside of the
2362 PNG_READ|WRITE_ANCILLARY_CHUNK_SUPPORTED blocks.
2363
2364 Version 1.4.0beta65 [June 26, 2009]
2365 Added a reference to the libpng license in each file.
2366
2367 Version 1.4.0beta66 [June 27, 2009]
2368 Refer to the libpng license instead of the libpng license in each file.
2369
2370 Version 1.4.0beta67 [July 6, 2009]
2371 Relocated INVERT_ALPHA within png_read_png() and png_write_png().
2372 Added high-level API transform PNG_TRANSFORM_GRAY_TO_RGB.
2373 Added an "xcode" project to the projects directory (Alam Arias).
2374
2375 Version 1.4.0beta68 [July 19, 2009]
2376 Avoid some tests in filter selection in pngwutil.c
2377
2378 Version 1.4.0beta69 [July 25, 2009]
2379 Simplified the new filter-selection test. This runs faster in the
2380 common "PNG_ALL_FILTERS" and PNG_FILTER_NONE cases.
2381 Removed extraneous declaration from the new call to png_read_gray_to_rgb()
2382 (bug introduced in libpng-1.4.0beta67).
2383 Fixed up xcode project (Alam Arias)
2384 Added a prototype for png_64bit_product() in png.c
2385
2386 Version 1.4.0beta70 [July 27, 2009]
2387 Avoid a possible NULL dereference in debug build, in png_set_text_2().
2388 (bug introduced in libpng-0.95, discovered by Evan Rouault)
2389
2390 Version 1.4.0beta71 [July 29, 2009]
2391 Rebuilt configure scripts with autoconf-2.64.
2392
2393 Version 1.4.0beta72 [August 1, 2009]
2394 Replaced *.tar.lzma with *.tar.xz in distribution. Get the xz codec
2395 from <http://tukaani.org/xz>.
2396
2397 Version 1.4.0beta73 [August 1, 2009]
2398 Reject attempt to write iCCP chunk with negative embedded profile length
2399 (JD Chen) (CVE-2009-5063).
2400
2401 Version 1.4.0beta74 [August 8, 2009]
2402 Changed png_ptr and info_ptr member "trans" to "trans_alpha".
2403
2404 Version 1.4.0beta75 [August 21, 2009]
2405 Removed an extra png_debug() recently added to png_write_find_filter().
2406 Fixed incorrect #ifdef in pngset.c regarding unknown chunk support.
2407
2408 Version 1.4.0beta76 [August 22, 2009]
2409 Moved an incorrectly located test in png_read_row() in pngread.c
2410
2411 Version 1.4.0beta77 [August 27, 2009]
2412 Removed lpXYZ.tar.bz2 (with CRLF), KNOWNBUG, libpng-x.y.z-KNOWNBUG.txt,
2413 and the "noconfig" files from the distribution.
2414 Moved CMakeLists.txt from scripts into the main libpng directory.
2415 Various bugfixes and improvements to CMakeLists.txt (Philip Lowman)
2416
2417 Version 1.4.0beta78 [August 31, 2009]
2418 Converted all PNG_NO_* tests to PNG_*_SUPPORTED everywhere except pngconf.h
2419 Eliminated PNG_NO_FREE_ME and PNG_FREE_ME_SUPPORTED macros.
2420 Use png_malloc plus a loop instead of png_calloc() to initialize
2421 row_pointers in png_read_png().
2422
2423 Version 1.4.0beta79 [September 1, 2009]
2424 Eliminated PNG_GLOBAL_ARRAYS and PNG_LOCAL_ARRAYS; always use local arrays.
2425 Eliminated PNG_CALLOC_SUPPORTED macro and always provide png_calloc().
2426
2427 Version 1.4.0beta80 [September 17, 2009]
2428 Removed scripts/libpng.icc
2429 Changed typecast of filler from png_byte to png_uint_16 in png_set_filler().
2430 (Dennis Gustafsson)
2431 Fixed typo introduced in beta78 in pngtest.c ("#if def " should be "#ifdef ")
2432
2433 Version 1.4.0beta81 [September 23, 2009]
2434 Eliminated unused PNG_FLAG_FREE_* defines from pngpriv.h
2435 Expanded TAB characters in pngrtran.c
2436 Removed PNG_CONST from all "PNG_CONST PNG_CHNK" declarations to avoid
2437 compiler complaints about doubly declaring things "const".
2438 Changed all "#if [!]defined(X)" to "if[n]def X" where possible.
2439 Eliminated unused png_ptr->row_buf_size
2440
2441 Version 1.4.0beta82 [September 25, 2009]
2442 Moved redundant IHDR checking into new png_check_IHDR() in png.c
2443 and report all errors found in the IHDR data.
2444 Eliminated useless call to png_check_cHRM() from pngset.c
2445
2446 Version 1.4.0beta83 [September 25, 2009]
2447 Revised png_check_IHDR() to eliminate bogus complaint about filter_type.
2448
2449 Version 1.4.0beta84 [September 30, 2009]
2450 Fixed some inconsistent indentation in pngconf.h
2451 Revised png_check_IHDR() to add a test for width variable less than 32-bit.
2452
2453 Version 1.4.0beta85 [October 1, 2009]
2454 Revised png_check_IHDR() again, to check info_ptr members instead of
2455 the contents of the returned parameters.
2456
2457 Version 1.4.0beta86 [October 9, 2009]
2458 Updated the "xcode" project (Alam Arias).
2459 Eliminated a shadowed declaration of "pp" in png_handle_sPLT().
2460
2461 Version 1.4.0rc01 [October 19, 2009]
2462 Trivial cosmetic changes.
2463
2464 Version 1.4.0beta87 [October 30, 2009]
2465 Moved version 1.4.0 back into beta.
2466
2467 Version 1.4.0beta88 [October 30, 2009]
2468 Revised libpng*.txt section about differences between 1.2.x and 1.4.0
2469 because most of the new features have now been ported back to 1.2.41
2470
2471 Version 1.4.0beta89 [November 1, 2009]
2472 More bugfixes and improvements to CMakeLists.txt (Philip Lowman)
2473 Removed a harmless extra png_set_invert_alpha() from pngwrite.c
2474 Apply png_user_chunk_cache_max within png_decompress_chunk().
2475 Merged libpng-1.2.41.txt with libpng-1.4.0.txt where appropriate.
2476
2477 Version 1.4.0beta90 [November 2, 2009]
2478 Removed all remaining WIN32_WCE #ifdefs except those involving the
2479 time.h "tm" structure
2480
2481 Version 1.4.0beta91 [November 3, 2009]
2482 Updated scripts/pngw32.def and projects/wince/png32ce.def
2483 Copied projects/wince/png32ce.def to the scripts directory.
2484 Added scripts/makefile.wce
2485 Patched ltmain.sh for wince support.
2486 Added PNG_CONVERT_tIME_SUPPORTED macro.
2487
2488 Version 1.4.0beta92 [November 4, 2009]
2489 Make inclusion of time.h in pngconf.h depend on PNG_CONVERT_tIME_SUPPORTED
2490 Make #define PNG_CONVERT_tIME_SUPPORTED depend on PNG_WRITE_tIME_SUPPORTED
2491 Revised libpng*.txt to describe differences from 1.2.40 to 1.4.0 (instead
2492 of differences from 1.2.41 to 1.4.0)
2493
2494 Version 1.4.0beta93 [November 7, 2009]
2495 Added PNG_DEPSTRUCT, PNG_DEPRECATED, PNG_USE_RESULT, PNG_NORETURN, and
2496 PNG_ALLOCATED macros to detect deprecated direct access to the
2497 png_struct or info_struct members and other deprecated usage in
2498 applications (John Bowler).
2499 Updated scripts/makefile* to add "-DPNG_CONFIGURE_LIBPNG" to CFLAGS,
2500 to prevent warnings about direct access to png structs by libpng
2501 functions while building libpng. They need to be tested, especially
2502 those using compilers other than gcc.
2503 Updated projects/visualc6 and visualc71 with "/d PNG_CONFIGURE_LIBPNG".
2504 They should work but still need to be updated to remove
2505 references to pnggccrd.c or pngvcrd.c and ASM building.
2506 Added README.txt to the beos, cbuilder5, netware, and xcode projects warning
2507 that they need to be updated, to remove references to pnggccrd.c and
2508 pngvcrd.c and to depend on pngpriv.h
2509 Removed three direct references to read_info_ptr members in pngtest.c
2510 that were detected by the new PNG_DEPSTRUCT macro.
2511 Moved the png_debug macro definitions and the png_read_destroy(),
2512 png_write_destroy() and png_far_to_near() prototypes from png.h
2513 to pngpriv.h (John Bowler)
2514 Moved the synopsis lines for png_read_destroy(), png_write_destroy()
2515 png_debug(), png_debug1(), and png_debug2() from libpng.3 to libpngpf.3.
2516
2517 Version 1.4.0beta94 [November 9, 2009]
2518 Removed the obsolete, unused pnggccrd.c and pngvcrd.c files.
2519 Updated CMakeLists.txt to add "-DPNG_CONFIGURE_LIBPNG" to the definitions.
2520 Removed dependency of pngtest.o on pngpriv.h in the makefiles.
2521 Only #define PNG_DEPSTRUCT, etc. in pngconf.h if not already defined.
2522
2523 Version 1.4.0beta95 [November 10, 2009]
2524 Changed png_check_sig() to !png_sig_cmp() in contrib programs.
2525 Added -DPNG_CONFIGURE_LIBPNG to contrib/pngminm/*/makefile
2526 Changed png_check_sig() to !png_sig_cmp() in contrib programs.
2527 Corrected the png_get_IHDR() call in contrib/gregbook/readpng2.c
2528 Changed pngminim/*/gather.sh to stop trying to remove pnggccrd.c and pngvcrd.c
2529 Added dependency on pngpriv.h in contrib/pngminim/*/makefile
2530
2531 Version 1.4.0beta96 [November 12, 2009]
2532 Renamed scripts/makefile.wce to scripts/makefile.cegcc
2533 Revised Makefile.am to use libpng.sys while building libpng.so
2534 so that only PNG_EXPORT functions are exported.
2535 Removed the deprecated png_check_sig() function/macro.
2536 Removed recently removed function names from scripts/*.def
2537 Revised pngtest.png to put chunks in the same order written by pngtest
2538 (evidently the same change made in libpng-1.0beta54 was lost).
2539 Added PNG_PRIVATE macro definition in pngconf.h for possible future use.
2540
2541 Version 1.4.0beta97 [November 13, 2009]
2542 Restored pngtest.png to the libpng-1.4.0beta7 version.
2543 Removed projects/beos and netware.txt; no one seems to be supporting them.
2544 Revised Makefile.in
2545
2546 Version 1.4.0beta98 [November 13, 2009]
2547 Added the "xcode" project to zip distributions,
2548 Fixed a typo in scripts/pngwin.def introduced in beta97.
2549
2550 Version 1.4.0beta99 [November 14, 2009]
2551 Moved libpng-config.in and libpng.pc-configure.in out of the scripts
2552 directory, to libpng-config.in and libpng-pc.in, respectively, and
2553 modified Makefile.am and configure.ac accordingly. Now "configure"
2554 needs nothing from the "scripts" directory.
2555 Avoid redefining PNG_CONST in pngconf.h
2556
2557 Version 1.4.0beta100 [November 14, 2009]
2558 Removed ASM builds from projects/visualc6 and projects/visualc71
2559 Removed scripts/makefile.nommx and makefile.vcawin32
2560 Revised CMakeLists.txt to account for new location of libpng-config.in
2561 and libpng-pc.in
2562 Updated INSTALL to reflect removal and relocation of files.
2563
2564 Version 1.4.0beta101 [November 14, 2009]
2565 Restored the binary files (*.jpg, *.png, some project files) that were
2566 accidentally deleted from the zip and 7z distributions when the xcode
2567 project was added.
2568
2569 Version 1.4.0beta102 [November 18, 2009]
2570 Added libpng-config.in and libpng-pc.in to the zip and 7z distributions.
2571 Fixed a typo in projects/visualc6/pngtest.dsp, introduced in beta100.
2572 Moved descriptions of makefiles and other scripts out of INSTALL into
2573 scripts/README.txt
2574 Updated the copyright year in scripts/pngwin.rc from 2006 to 2009.
2575
2576 Version 1.4.0beta103 [November 21, 2009]
2577 Removed obsolete comments about ASM from projects/visualc71/README_zlib.txt
2578 Align row_buf on 16-byte boundary in memory.
2579 Restored the PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED guard around the call
2580 to png_flush() after png_write_IEND(). See 1.4.0beta32, 1.4.0beta50
2581 changes above and 1.2.30, 1.2.30rc01 and rc03 in 1.2.41 CHANGES. Someone
2582 needs this feature.
2583 Make the 'png_jmpbuf' macro expand to a call that records the correct
2584 longjmp function as well as returning a pointer to the setjmp
2585 jmp_buf buffer, and marked direct access to jmpbuf 'deprecated'.
2586 (John Bowler)
2587
2588 Version 1.4.0beta104 [November 22, 2009]
2589 Removed png_longjmp_ptr from scripts/*.def and libpng.3
2590 Rebuilt configure scripts with autoconf-2.65
2591
2592 Version 1.4.0beta105 [November 25, 2009]
2593 Use fast integer PNG_DIVIDE_BY_255() or PNG_DIVIDE_BY_65535()
2594 to accomplish alpha premultiplication when
2595 PNG_READ_COMPOSITE_NODIV_SUPPORTED is defined.
2596 Changed "/255" to "/255.0" in background calculations to make it clear
2597 that the 255 is used as a double.
2598
2599 Version 1.4.0beta106 [November 27, 2009]
2600 Removed premultiplied alpha feature.
2601
2602 Version 1.4.0beta107 [December 4, 2009]
2603 Updated README
2604 Added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files.
2605 Removed "-DPNG_CONFIGURE_LIBPNG" from the makefiles and projects.
2606 Revised scripts/makefile.netbsd, makefile.openbsd, and makefile.sco
2607 to put png.h and pngconf.h in $prefix/include, like the other scripts,
2608 instead of in $prefix/include/libpng. Also revised makefile.sco
2609 to put them in $prefix/include/libpng15 instead of in
2610 $prefix/include/libpng/libpng15.
2611
2612 Version 1.4.0beta108 [December 11, 2009]
2613 Removed leftover "-DPNG_CONFIGURE_LIBPNG" from contrib/pngminim/*/makefile
2614 Relocated png_do_chop() to its original position in pngrtran.c; the
2615 change in version 1.2.41beta08 caused transparency to be handled wrong
2616 in some 16-bit datastreams (Yusaku Sugai).
2617
2618 Version 1.4.0beta109 [December 13, 2009]
2619 Added "bit_depth" parameter to the private png_build_gamma_table() function.
2620 Pass bit_depth=8 to png_build_gamma_table() when bit_depth is 16 but the
2621 PNG_16_TO_8 transform has been set, to avoid unnecessary build of 16-bit
2622 tables.
2623
2624 Version 1.4.0rc02 [December 20, 2009]
2625 Declared png_cleanup_needed "volatile" in pngread.c and pngwrite.c
2626
2627 Version 1.4.0rc03 [December 22, 2009]
2628 Renamed libpng-pc.in back to libpng.pc.in and revised CMakeLists.txt
2629 (revising the change in 1.4.0beta99)
2630
2631 Version 1.4.0rc04 [December 25, 2009]
2632 Swapped PNG_UNKNOWN_CHUNKS_SUPPORTED and PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2633 in pngset.c to be consistent with other changes in version 1.2.38.
2634
2635 Version 1.4.0rc05 [December 25, 2009]
2636 Changed "libpng-pc.in" to "libpng.pc.in" in configure.ac, configure, and
2637 Makefile.in to be consistent with changes in libpng-1.4.0rc03
2638
2639 Version 1.4.0rc06 [December 29, 2009]
2640 Reverted the gamma_table changes from libpng-1.4.0beta109.
2641 Fixed some indentation errors.
2642
2643 Version 1.4.0rc07 [January 1, 2010]
2644 Revised libpng*.txt and libpng.3 about 1.2.x->1.4.x differences.
2645 Use png_calloc() instead of png_malloc(); png_memset() in pngrutil.c
2646 Update copyright year to 2010.
2647
2648 Version 1.4.0rc08 [January 2, 2010]
2649 Avoid deprecated references to png_ptr-io_ptr and png_ptr->error_ptr
2650 in pngtest.c
2651
2652 Version 1.4.0 [January 3, 2010]
2653 No changes.
2654
2655 Version 1.4.1beta01 [January 8, 2010]
2656 Updated CMakeLists.txt for consistent indentation and to avoid an
2657 unclosed if-statement warning (Philip Lowman).
2658 Revised Makefile.am and Makefile.in to remove references to Y2KINFO,
2659 KNOWNBUG, and libpng.la (Robert Schwebel).
2660 Revised the makefiles to install the same files and symbolic
2661 links as configure, except for libpng.la and libpng14.la.
2662 Make png_set|get_compression_buffer_size() available even when
2663 PNG_WRITE_SUPPORTED is not enabled.
2664 Revised Makefile.am and Makefile.in to simplify their maintenance.
2665 Revised scripts/makefile.linux to install a link to libpng14.so.14.1
2666
2667 Version 1.4.1beta02 [January 9, 2010]
2668 Revised the rest of the makefiles to install a link to libpng14.so.14.1
2669
2670 Version 1.4.1beta03 [January 10, 2010]
2671 Removed png_set_premultiply_alpha() from scripts/*.def
2672
2673 Version 1.4.1rc01 [January 16, 2010]
2674 No changes.
2675
2676 Version 1.4.1beta04 [January 23, 2010]
2677 Revised png_decompress_chunk() to improve speed and memory usage when
2678 decoding large chunks.
2679 Added png_set|get_chunk_malloc_max() functions.
2680
2681 Version 1.4.1beta05 [January 26, 2010]
2682 Relocated "int k" declaration in pngtest.c to minimize its scope.
2683
2684 Version 1.4.1beta06 [January 28, 2010]
2685 Revised png_decompress_chunk() to use a two-pass method suggested by
2686 John Bowler.
2687
2688 Version 1.4.1beta07 [February 6, 2010]
2689 Folded some long lines in the source files.
2690 Added defineable PNG_USER_CHUNK_CACHE_MAX, PNG_USER_CHUNK_MALLOC_MAX,
2691 and a PNG_USER_LIMITS_SUPPORTED flag.
2692 Eliminated use of png_ptr->irowbytes and reused the slot in png_ptr as
2693 png_ptr->png_user_chunk_malloc_max.
2694 Revised png_push_save_buffer() to do fewer but larger png_malloc() calls.
2695
2696 Version 1.4.1beta08 [February 6, 2010]
2697 Minor cleanup and updating of dates and copyright year.
2698
2699 Version 1.5.0beta01 [February 7, 2010]
2700 Moved declaration of png_struct into private pngstruct.h and png_info
2701 into pnginfo.h
2702
2703 Version 1.4.1beta09 and 1.5.0beta02 [February 7, 2010]
2704 Reverted to original png_push_save_buffer() code.
2705
2706 Version 1.4.1beta10 and 1.5.0beta03 [February 8, 2010]
2707 Return allocated "old_buffer" in png_push_save_buffer() before
2708 calling png_error(), to avoid a potential memory leak.
2709 Updated configure script to use SO number 15.
2710
2711 Version 1.5.0beta04 [February 9, 2010]
2712 Removed malformed "incomplete struct declaration" of png_info from png.h
2713
2714 Version 1.5.0beta05 [February 12, 2010]
2715 Removed PNG_DEPSTRUCT markup in pngstruct.h and pnginfo.h, and undid the
2716 linewrapping that it entailed.
2717 Revised comments in pngstruct.h and pnginfo.h and added pointers to
2718 the libpng license.
2719 Changed PNG_INTERNAL to PNG_EXPOSE_INTERNAL_STRUCTURES
2720 Removed the cbuilder5 project, which has not been updated to 1.4.0.
2721
2722 Version 1.4.1beta12 and 1.5.0beta06 [February 14, 2010]
2723 Fixed type declaration of png_get_chunk_malloc_max() in pngget.c (Daisuke
2724 Nishikawa)
2725
2726 Version 1.5.0beta07 [omitted]
2727
2728 Version 1.5.0beta08 [February 19, 2010]
2729 Changed #ifdef PNG_NO_STDIO_SUPPORTED to #ifdef PNG_NO_CONSOLE_IO_SUPPORTED
2730 wherever png_snprintf() is used to construct error and warning messages.
2731 Noted in scripts/makefile.mingw that it expects to be run under MSYS.
2732 Removed obsolete unused MMX-querying support from contrib/gregbook
2733 Added exported png_longjmp() function.
2734 Removed the AIX redefinition of jmpbuf in png.h
2735 Added -D_ALLSOURCE in configure.ac, makefile.aix, and CMakeLists.txt
2736 when building on AIX.
2737
2738 Version 1.5.0beta09 [February 19, 2010]
2739 Removed -D_ALLSOURCE from configure.ac, makefile.aix, and CMakeLists.txt.
2740 Changed the name of png_ptr->jmpbuf to png_ptr->png_jmpbuf in pngstruct.h
2741
2742 Version 1.5.0beta10 [February 25, 2010]
2743 Removed unused gzio.c from contrib/pngminim gather and makefile scripts
2744 Removed replacement error handlers from contrib/gregbook. Because of
2745 the new png_longjmp() function they are no longer needed.
2746
2747 Version 1.5.0beta11 [March 6, 2010]
2748 Removed checking for already-included setjmp.h from pngconf.h
2749 Fixed inconsistent indentations and made numerous cosmetic changes.
2750 Revised the "SEE ALSO" style of libpng.3, libpngpf.3, and png.5
2751
2752 Version 1.5.0beta12 [March 9, 2010]
2753 Moved "#include png.h" inside pngpriv.h and removed "#include png.h" from
2754 the source files, along with "#define PNG_EXPOSE_INTERNAL_STRUCTURES"
2755 and "#define PNG_NO_PEDANTIC_WARNINGS" (John Bowler).
2756 Created new pngdebug.h and moved debug definitions there.
2757
2758 Version 1.5.0beta13 [March 10, 2010]
2759 Protect pngstruct.h, pnginfo.h, and pngdebug.h from being included twice.
2760 Revise the "#ifdef" blocks in png_inflate() so it will compile when neither
2761 PNG_USER_CHUNK_MALLOC_MAX nor PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
2762 is defined.
2763 Removed unused png_measure_compressed_chunk() from pngpriv.h and libpngpf.3
2764 Moved the 'config.h' support from pngconf.h to pngpriv.h
2765 Removed PNGAPI from the png_longjmp_ptr typedef.
2766 Eliminated dependence of pngtest.c on the private pngdebug.h file.
2767 Make all png_debug macros into *unterminated* statements or
2768 expressions (i.e. a trailing ';' must always be added) and correct
2769 the format statements in various png_debug messages.
2770
2771 Version 1.5.0beta14 [March 14, 2010]
2772 Removed direct access to png_ptr->io_ptr from the Windows code in pngtest.c
2773 Revised Makefile.am to account for recent additions and replacements.
2774 Corrected CE and OS/2 DEF files (scripts/png*def) for symbols removed and
2775 added ordinal numbers to the Windows DEF file and corrected the duplicated
2776 ordinal numbers on CE symbols that are commented out.
2777 Added back in export symbols that can be present in the Windows build but
2778 are disabled by default.
2779 PNG_EXPORT changed to include an 'ordinal' field for DEF file generation.
2780 PNG_CALLBACK added to make callback definitions uniform. PNGAPI split
2781 into PNGCAPI (base C form), PNGAPI (exports) and PNGCBAPI (callbacks),
2782 and appropriate changes made to all files. Cygwin builds re-hinged to
2783 allow procedure call standard changes and to remove the need for the DEF
2784 file (fixes build on Cygwin).
2785 Enabled 'attribute' warnings that are relevant to library APIs and callbacks.
2786 Changed rules for generation of the various symbol files and added a new
2787 rule for a DEF file (which is also added to the distribution).
2788 Updated the symbol file generation to stop it adding spurious spaces
2789 to EOL (coming from preprocessor macro expansion). Added a facility
2790 to join tokens in the output and rewrite *.dfn to use this.
2791 Eliminated scripts/*.def in favor of libpng.def; updated projects/visualc71
2792 and removed scripts/makefile.cygwin.
2793 Made PNG_BUILD_DLL safe: it can be set whenever a DLL is being built.
2794 Removed the include of sys/types.h - apparently unnecessary now on the
2795 platforms on which it happened (all but Mac OS and RISC OS).
2796 Moved the Mac OS test into pngpriv.h (the only place it is used.)
2797
2798 Version 1.5.0beta15 [March 17, 2010]
2799 Added symbols.chk target to Makefile.am to validate the symbols in png.h
2800 against the new DEF file scripts/symbols.def.
2801 Changed the default DEF file back to pngwin.def.
2802 Removed makefile.mingw.
2803 Eliminated PNG_NO_EXTERN and PNG_ALL_EXTERN
2804
2805 Version 1.5.0beta16 [April 1, 2010]
2806 Make png_text_struct independent of PNG_iTXt_SUPPORTED, so that
2807 fields are initialized in all configurations. The READ/WRITE
2808 macros (PNG_(READ|WRITE)_iTXt_SUPPORTED) still function as
2809 before to disable code to actually read or write iTXt chunks
2810 and iTXt_SUPPORTED can be used to detect presence of either
2811 read or write support (but it is probably better to check for
2812 the one actually required - read or write.)
2813 Combined multiple png_warning() calls for a single error.
2814 Restored the macro definition of png_check_sig().
2815
2816 Version 1.5.0beta17 [April 17, 2010]
2817 Added some "(long)" typecasts to printf calls in png_handle_cHRM().
2818 Documented the fact that png_set_dither() was disabled since libpng-1.4.0.
2819 Reenabled png_set_dither() but renamed it to png_set_quantize() to reflect
2820 more accurately what it actually does. At the same time, renamed
2821 the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros to
2822 PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS.
2823 Added some "(long)" typecasts to printf calls in png_handle_cHRM().
2824 Freeze build-time only configuration in the build.
2825 In all prior versions of libpng most configuration options
2826 controlled by compiler #defines had to be repeated by the
2827 application code that used libpng. This patch changes this
2828 so that compilation options that can only be changed at build
2829 time are frozen in the build. Options that are compiler
2830 dependent (and those that are system dependent) are evaluated
2831 each time - pngconf.h holds these. Options that can be changed
2832 per-file in the application are in png.h. Frozen options are
2833 in the new installed header file pnglibconf.h (John Bowler)
2834 Removed the xcode project because it has not been updated to work
2835 with libpng-1.5.0.
2836 Removed the ability to include optional pngusr.h
2837
2838 Version 1.5.0beta18 [April 17, 2010]
2839 Restored the ability to include optional pngusr.h
2840 Moved replacements for png_error() and png_warning() from the
2841 contrib/pngminim project to pngerror.c, for use when warnings or
2842 errors are disabled via PNG_NO_WARN or PNG_NO_ERROR_TEXT, to avoid
2843 storing unneeded error/warning text.
2844 Updated contrib/pngminim project to work with the new pnglibconf.h
2845 Added some PNG_NO_* defines to contrib/pngminim/*/pngusr.h to save space.
2846
2847 Version 1.5.0beta19 [April 24, 2010]
2848 Added PNG_{READ,WRITE}_INT_FUNCTIONS_SUPPORTED. This allows the functions
2849 to read and write ints to be disabled independently of PNG_USE_READ_MACROS,
2850 which allows libpng to be built with the functions even though the default
2851 is to use the macros - this allows applications to choose at app build
2852 time whether or not to use macros (previously impossible because the
2853 functions weren't in the default build.)
2854 Changed Windows calling convention back to __cdecl for API functions.
2855 For Windows/x86 platforms only:
2856 __stdcall is no longer needed for Visual Basic, so libpng-1.5.0 uses
2857 __cdecl throughout (both API functions and callbacks) on Windows/x86
2858 platforms.
2859 Replaced visualc6 and visualc71 projects with new vstudio project
2860 Relaxed the overly-restrictive permissions of some files.
2861
2862 Version 1.5.0beta20 [April 24, 2010]
2863 Relaxed more overly-restrictive permissions of some files.
2864
2865 Version 1.5.0beta21 [April 27, 2010]
2866 Removed some unwanted binary bytes and changed CRLF to NEWLINE in the new
2867 vstudio project files, and some trivial editing of some files in the
2868 scripts directory.
2869 Set PNG_NO_READ_BGR, PNG_NO_IO_STATE, and PNG_NO_TIME_RFC1123 in
2870 contrib/pngminim/decoder/pngusr.h to make a smaller decoder application.
2871
2872 Version 1.5.0beta22 [April 28, 2010]
2873 Fixed dependencies of GET_INT_32 - it does not require READ_INT_FUNCTIONS
2874 because it has a macro equivalent.
2875 Improved the options.awk script; added an "everything off" option.
2876 Revised contrib/pngminim to use the "everything off" option in pngusr.dfa.
2877
2878 Version 1.5.0beta23 [April 29, 2010]
2879 Corrected PNG_REMOVED macro to take five arguments.
2880 The macro was documented with two arguments (name,ordinal), however
2881 the symbol checking .dfn files assumed five arguments. The five
2882 argument form seems more useful so it is changed to that.
2883 Corrected PNG_UNKNOWN_CHUNKS_SUPPORTED to PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2884 in gregbook/readpng2.c
2885 Corrected protection of png_get_user_transform_ptr. The API declaration in
2886 png.h is removed if both READ and WRITE USER_TRANSFORM are turned off
2887 but was left defined in pngtrans.c
2888 Added logunsupported=1 to cause pnglibconf.h to document disabled options.
2889 This makes the installed pnglibconf.h more readable but causes no
2890 other change. The intention is that users of libpng will find it
2891 easier to understand if an API they need is missing.
2892 Include png_reset_zstream() in png.c only when PNG_READ_SUPPORTED is defined.
2893 Removed dummy_inflate.c from contrib/pngminim/encoder
2894 Removed contrib/pngminim/*/gather.sh; gathering is now done in the makefile.
2895
2896 Version 1.5.0beta24 [May 7, 2010]
2897 Use bitwise "&" instead of arithmetic mod in pngrutil.c calculation of the
2898 offset of the png_ptr->rowbuf pointer into png_ptr->big_row_buf.
2899 Added more blank lines for readability.
2900
2901 Version 1.5.0beta25 [June 18, 2010]
2902 In pngpread.c: png_push_have_row() add check for new_row > height
2903 Removed the now-redundant check for out-of-bounds new_row from example.c
2904
2905 Version 1.5.0beta26 [June 18, 2010]
2906 In pngpread.c: png_push_process_row() add check for too many rows.
2907
2908 Version 1.5.0beta27 [June 18, 2010]
2909 Removed the check added in beta25 as it is now redundant.
2910
2911 Version 1.5.0beta28 [June 20, 2010]
2912 Rewrote png_process_IDAT_data to consistently treat extra data as warnings
2913 and handle end conditions more cleanly.
2914 Removed the new (beta26) check in png_push_process_row().
2915
2916 Version 1.5.0beta29 [June 21, 2010]
2917 Revised scripts/options.awk to work on Sunos (but still doesn't work)
2918 Added comment to options.awk and contrib/pngminim/*/makefile to try nawk.
2919
2920 Version 1.5.0beta30 [June 22, 2010]
2921 Stop memory leak when reading a malformed sCAL chunk.
2922
2923 Version 1.5.0beta31 [June 26, 2010]
2924 Revised pngpread.c patch of beta28 to avoid an endless loop.
2925 Removed some trailing blanks.
2926
2927 Version 1.5.0beta32 [June 26, 2010]
2928 Removed leftover scripts/options.patch and scripts/options.rej
2929
2930 Version 1.5.0beta33 [July 6, 3010]
2931 Made FIXED and FLOATING options consistent in the APIs they enable and
2932 disable. Corrected scripts/options.awk to handle both command line
2933 options and options specified in the .dfa files.
2934 Changed char *msg to PNG_CONST char *msg in pngrutil.c
2935 Make png_set_sRGB_gAMA_and_cHRM set values using either the fixed or
2936 floating point APIs, but not both.
2937 Reversed patch to remove error handler when the jmp_buf is stored in the
2938 main program structure, not the png_struct.
2939 The error handler is needed because the default handler in libpng will
2940 always use the jmp_buf in the library control structure; this is never
2941 set. The gregbook code is a useful example because, even though it
2942 uses setjmp/longjmp, it shows how error handling can be implemented
2943 using control mechanisms not directly supported by libpng. The
2944 technique will work correctly with mechanisms such as Microsoft
2945 Structure Exceptions or C++ exceptions (compiler willing - note that gcc
2946 does not by default support interworking of C and C++ error handling.)
2947 Reverted changes to call png_longjmp in contrib/gregbook where it is not
2948 appropriate. If mainprog->jmpbuf is used by setjmp, then png_longjmp
2949 cannot be used.
2950 Changed "extern PNG_EXPORT" to "PNG_EXPORT" in png.h (Jan Nijtmans)
2951 Changed "extern" to "PNG_EXTERN" in pngpriv.h (except for the 'extern "C" {')
2952
2953 Version 1.5.0beta34 [July 12, 2010]
2954 Put #ifndef PNG_EXTERN, #endif around the define PNG_EXTERN in pngpriv.h
2955
2956 Version 1.5.0beta35 [July 24, 2010]
2957 Removed some newly-added TAB characters.
2958 Added -DNO_PNG_SNPRINTF to CFLAGS in scripts/makefile.dj2
2959 Moved the definition of png_snprintf() outside of the enclosing
2960 #ifdef blocks in pngconf.h
2961
2962 Version 1.5.0beta36 [July 29, 2010]
2963 Patches by John Bowler:
2964 Fixed point APIs are now supported throughout (no missing APIs).
2965 Internal fixed point arithmetic support exists for all internal floating
2966 point operations.
2967 sCAL validates the floating point strings it is passed.
2968 Safe, albeit rudimentary, Watcom support is provided by PNG_API_RULE==2
2969 Two new APIs exist to get the number of passes without turning on the
2970 PNG_INTERLACE transform and to get the number of rows in the current
2971 pass.
2972 A new test program, pngvalid.c, validates the gamma code.
2973 Errors in the 16-bit gamma correction (overflows) have been corrected.
2974 cHRM chunk testing is done consistently (previously the floating point
2975 API bypassed it, because the test really didn't work on FP, now the test
2976 is performed on the actual values to be stored in the PNG file so it
2977 works in the FP case too.)
2978 Most floating point APIs now simply call the fixed point APIs after
2979 converting the values to the fixed point form used in the PNG file.
2980 The standard headers no longer include zlib.h, which is currently only
2981 required for pngstruct.h and can therefore be internal.
2982 Revised png_get_int_32 to undo the PNG two's complement representation of
2983 negative numbers.
2984
2985 Version 1.5.0beta37 [July 30, 2010]
2986 Added a typecast in png_get_int_32() in png.h and pngrutil.h to avoid
2987 a compiler warning.
2988 Replaced oFFs 0,0 with oFFs -10,20 in pngtest.png
2989
2990 Version 1.5.0beta38 [July 31, 2010]
2991 Implemented remaining "_fixed" functions.
2992 Corrected a number of recently introduced warnings mostly resulting from
2993 safe but uncast assignments to shorter integers. Also added a zlib
2994 VStudio release library project because the latest zlib Official Windows
2995 build does not include such a thing.
2996 Revised png_get_int_16() to be similar to png_get_int_32().
2997 Restored projects/visualc71.
2998
2999 Version 1.5.0beta39 [August 2, 2010]
3000 VisualC/GCC warning fixes, VisualC build fixes
3001 The changes include support for function attributes in VC in addition to
3002 those already present in GCC - necessary because without these some
3003 warnings are unavoidable. Fixes include signed/unsigned fixes in
3004 pngvalid and checks with gcc -Wall -Wextra -Wunused.
3005 VC requires function attributes on function definitions as well as
3006 declarations, PNG_FUNCTION has been added to enable this and the
3007 relevant function definitions changed.
3008
3009 Version 1.5.0beta40 [August 6, 2010]
3010 Correct use of _WINDOWS_ in pngconf.h
3011 Removed png_mem_ #defines; they are no longer used.
3012 Added the sRGB chunk to pngtest.png
3013
3014 Version 1.5.0beta41 [August 11, 2010]
3015 Added the cHRM chunk to pngtest.png
3016 Don't try to use version-script with cygwin/mingw.
3017 Revised contrib/gregbook to work under cygwin/mingw.
3018
3019 Version 1.5.0beta42 [August 18, 2010]
3020 Add .dll.a to the list of extensions to be symlinked by Makefile.am (Yaakov)
3021 Made all API functions that have const arguments and constant string
3022 literal pointers declare them (John Bowler).
3023
3024 Version 1.5.0beta43 [August 20, 2010]
3025 Removed spurious tabs, shorten long lines (no source change)
3026 Also added scripts/chkfmt to validate the format of all the files that can
3027 reasonably be validated (it is suggested to run "make distclean" before
3028 checking, because some machine generated files have long lines.)
3029 Reformatted the CHANGES file to be more consistent throughout.
3030 Made changes to address various issues identified by GCC, mostly
3031 signed/unsigned and shortening problems on assignment but also a few
3032 difficult to optimize (for GCC) loops.
3033 Fixed non-GCC fixed point builds. In png.c a declaration was misplaced
3034 in an earlier update. Fixed to declare the auto variables at the head.
3035 Use cexcept.h in pngvalid.c.
3036
3037 Version 1.5.0beta44 [August 24, 2010]
3038 Updated CMakeLists.txt to use CMAKE_INSTALL_LIBDIR variable; useful for
3039 installing libpng in /usr/lib64 (Funda Wang).
3040 Revised CMakeLists.txt to put the man pages in share/man/man* not man/man*
3041 Revised CMakeLists.txt to make symlinks instead of copies when installing.
3042 Changed PNG_LIB_NAME from pngNN to libpngNN in CMakeLists.txt (Philip Lowman)
3043 Implemented memory checks within pngvalid
3044 Reformatted/rearranged pngvalid.c to assist use of progressive reader.
3045 Check interlaced images in pngvalid
3046 Clarified pngusr.h comments in pnglibconf.dfa
3047 Simplified the pngvalid error-handling code now that cexcept.h is in place.
3048 Implemented progressive reader in pngvalid.c for standard tests
3049 Implemented progressive read in pngvalid.c gamma tests
3050 Turn on progressive reader in pngvalid.c by default and tidy code.
3051
3052 Version 1.5.0beta45 [August 26, 2010]
3053 Added an explicit make step to projects/vstudio for pnglibconf.h
3054 Also corrected zlib.vcxproj into which Visual Studio had introduced
3055 what it calls an "authoring error". The change to make pnglibconf.h
3056 simply copies the file; in the future it may actually generate the
3057 file from scripts/pnglibconf.dfa as the other build systems do.
3058 Changed pngvalid to work when floating point APIs are disabled
3059 Renamed the prebuilt scripts/pnglibconf.h to scripts/pnglibconf.h.prebuilt
3060 Supply default values for PNG_USER_PRIVATEBUILD and PNG_USER_DLLFNAME_POSTFIX
3061 in pngpriv.h in case the user neglected to define them in their pngusr.h
3062
3063 Version 1.5.0beta46 [August 28, 2010]
3064 Added new private header files to libpng_sources in CMakeLists.txt
3065 Added PNG_READ_16BIT, PNG_WRITE_16BIT, and PNG_16BIT options.
3066 Added reference to scripts/pnglibconf.h.prebuilt in the visualc71 project.
3067
3068 Version 1.5.0beta47 [September 11, 2010]
3069 Fixed a number of problems with 64-bit compilation reported by Visual
3070 Studio 2010 (John Bowler).
3071
3072 Version 1.5.0beta48 [October 4, 2010]
3073 Updated CMakeLists.txt (Philip Lowman).
3074 Revised autogen.sh to recognize and use $AUTOCONF, $AUTOMAKE, $AUTOHEADER,
3075 $AUTOPOINT, $ACLOCAL and $LIBTOOLIZE
3076 Fixed problem with symbols creation in Makefile.am which was assuming that
3077 all versions of ccp write to standard output by default (Martin Banky). The
3078 bug was introduced in libpng-1.2.9beta5.
3079 Removed unused mkinstalldirs.
3080
3081 Version 1.5.0beta49 [October 8, 2010]
3082 Undid Makefile.am revision of 1.5.0beta48.
3083
3084 Version 1.5.0beta50 [October 14, 2010]
3085 Revised Makefile.in to account for mkinstalldirs being removed.
3086 Added some "(unsigned long)" typecasts in printf statements in pngvalid.c.
3087 Suppressed a compiler warning in png_handle_sPLT().
3088 Check for out-of-range text compression mode in png_set_text().
3089
3090 Version 1.5.0beta51 [October 15, 2010]
3091 Changed embedded dates to "(PENDING RELEASE) in beta releases (and future
3092 rc releases) to minimize the difference between releases.
3093
3094 Version 1.5.0beta52 [October 16, 2010]
3095 Restored some of the embedded dates (in png.h, png.c, documentation, etc.)
3096
3097 Version 1.5.0beta53 [October 18, 2010]
3098 Updated INSTALL to mention using "make maintainer-clean" and to remove
3099 obsolete statement about a custom ltmain.sh
3100 Disabled "color-tests" by default in Makefile.am so it will work with
3101 automake versions earlier than 1.11.1
3102 Use document name "libpng-manual.txt" instead of "libpng-<version>.txt"
3103 to simplify version differences.
3104 Removed obsolete remarks about setjmp handling from INSTALL.
3105 Revised and renamed the typedef in png.h and png.c that was designed
3106 to catch library and header mismatch.
3107
3108 Version 1.5.0beta54 [November 10, 2010]
3109 Require 48 bytes, not 64 bytes, for big_row_buf in overflow checks.
3110 Used a consistent structure for the pngget.c functions.
3111
3112 Version 1.5.0beta55 [November 21, 2010]
3113 Revised png_get_uint_32, png_get_int_32, png_get_uint_16 (Cosmin)
3114 Moved reading of file signature into png_read_sig (Cosmin)
3115 Fixed atomicity of chunk header serialization (Cosmin)
3116 Added test for io_state in pngtest.c (Cosmin)
3117 Added "#!/bin/sh" at the top of contrib/pngminim/*/gather.sh scripts.
3118 Changes to remove gcc warnings (John Bowler)
3119 Certain optional gcc warning flags resulted in warnings in libpng code.
3120 With these changes only -Wconversion and -Wcast-qual cannot be turned on.
3121 Changes are trivial rearrangements of code. -Wconversion is not possible
3122 for pngrutil.c (because of the widespread use of += et al on variables
3123 smaller than (int) or (unsigned int)) and -Wcast-qual is not possible
3124 with pngwio.c and pngwutil.c because the 'write' callback and zlib
3125 compression both fail to declare their input buffers with 'const'.
3126
3127 Version 1.5.0beta56 [December 7, 2010]
3128 Added the private PNG_UNUSED() macro definition in pngpriv.h.
3129 Added some commentary about PNG_EXPORT in png.h and pngconf.h
3130 Revised PNG_EXPORT() macro and added PNG_EXPORTA() macro, with the
3131 objective of simplifying and improving the cosmetic appearance of png.h.
3132 Fixed some incorrect "=" macro names in pnglibconf.dfa
3133 Included documentation of changes in 1.5.0 from 1.4.x in libpng-manual.txt
3134
3135 Version 1.5.0beta57 [December 9, 2010]
3136 Documented the pngvalid gamma error summary with additional comments and
3137 print statements.
3138 Improved missing symbol handling in checksym.awk; symbols missing in both
3139 the old and new files can now be optionally ignored, treated as errors
3140 or warnings.
3141 Removed references to pngvcrd.c and pnggccrd.c from the vstudio project.
3142 Updated "libpng14" to "libpng15" in the visualc71 project.
3143 Enabled the strip16 tests in pngvalid.`
3144 Don't display test results (except PASS/FAIL) when running "make test".
3145 Instead put them in pngtest-log.txt
3146 Added "--with-zprefix=<string>" to configure.ac
3147 Updated the prebuilt configuration files to autoconf version 2.68
3148
3149 Version 1.5.0beta58 [December 19, 2010]
3150 Fixed interlace image handling and add test cases (John Bowler)
3151 Fixed the clean rule in Makefile.am to remove pngtest-log.txt
3152 Made minor changes to work around warnings in gcc 3.4
3153
3154 Version 1.5.0rc01 [December 27, 2010]
3155 No changes.
3156
3157 Version 1.5.0rc02 [December 27, 2010]
3158 Eliminated references to the scripts/*.def files in project/visualc71.
3159
3160 Version 1.5.0rc03 [December 28, 2010]
3161 Eliminated scripts/*.def and revised Makefile.am accordingly
3162
3163 Version 1.5.0rc04 [December 29, 2010]
3164 Fixed bug in background transformation handling in pngrtran.c (it was
3165 looking for the flag in png_ptr->transformations instead of in
3166 png_ptr->flags) (David Raymond).
3167
3168 Version 1.5.0rc05 [December 31, 2010]
3169 Fixed typo in a comment in CMakeLists.txt (libpng14 => libpng15) (Cosmin)
3170
3171 Version 1.5.0rc06 [January 4, 2011]
3172 Changed the new configure option "zprefix=string" to "zlib-prefix=string"
3173
3174 Version 1.5.0rc07 [January 4, 2011]
3175 Updated copyright year.
3176
3177 Version 1.5.0 [January 6, 2011]
3178 No changes.
3179
3180 version 1.5.1beta01 [January 8, 2011]
3181 Added description of png_set_crc_action() to the manual.
3182 Added a note in the manual that the type of the iCCP profile was changed
3183 from png_charpp to png_bytepp in png_get_iCCP(). This change happened
3184 in version 1.5.0beta36 but is not noted in the CHANGES. Similarly,
3185 it was changed from png_charpp to png_const_bytepp in png_set_iCCP().
3186 Ensure that png_rgb_to_gray ignores palette mapped images, if libpng
3187 internally happens to call it with one, and fixed a failure to handle
3188 palette mapped images correctly. This fixes CVE-2690.
3189
3190 Version 1.5.1beta02 [January 14, 2011]
3191 Fixed a bug in handling of interlaced images (bero at arklinux.org).
3192 Updated CMakeLists.txt (Clifford Yapp)
3193
3194 Version 1.5.1beta03 [January 14, 2011]
3195 Fixed typecasting of some png_debug() statements (Cosmin)
3196
3197 Version 1.5.1beta04 [January 16, 2011]
3198 Updated documentation of png_set|get_tRNS() (Thomas Klausner).
3199 Mentioned in the documentation that applications must #include "zlib.h"
3200 if they need access to anything in zlib.h, and that a number of
3201 macros such as png_memset() are no longer accessible by applications.
3202 Corrected pngvalid gamma test "sample" function to access all of the color
3203 samples of each pixel, instead of sampling the red channel three times.
3204 Prefixed variable names index, div, exp, gamma with "png_" to avoid "shadow"
3205 warnings, and (mistakenly) changed png_exp() to exp().
3206
3207 Version 1.5.1beta05 [January 16, 2011]
3208 Changed variable names png_index, png_div, png_exp, and png_gamma to
3209 char_index, divisor, exp_b10, and gamma_val, respectively, and
3210 changed exp() back to png_exp().
3211
3212 Version 1.5.1beta06 [January 20, 2011]
3213 Prevent png_push_crc_skip() from hanging while reading an unknown chunk
3214 or an over-large compressed zTXt chunk with the progressive reader.
3215 Eliminated more GCC "shadow" warnings.
3216 Revised png_fixed() in png.c to avoid compiler warning about reaching the
3217 end without returning anything.
3218
3219 Version 1.5.1beta07 [January 22, 2011]
3220 In the manual, describe the png_get_IHDR() arguments in the correct order.
3221 Added const_png_structp and const_png_infop types, and used them in
3222 prototypes for most png_get_*() functions.
3223
3224 Version 1.5.1beta08 [January 23, 2011]
3225 Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()
3226 Added synopses for the IO_STATE functions and other missing synopses
3227 to the manual. Removed the synopses from libpngpf.3 because they
3228 were out of date and no longer useful. Better information can be
3229 obtained by reading the prototypes and comments in pngpriv.h
3230 Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build
3231 Added a make macro DFNCPP that is a CPP that will accept the tokens in
3232 a .dfn file and adds configure stuff to test for such a CPP. ./configure
3233 should fail if one is not available.
3234 Corrected const_png_ in png.h to png_const_ to avoid polluting the namespace.
3235 Added png_get_current_row_number and png_get_current_pass_number for the
3236 benefit of the user transform callback.
3237 Added png_process_data_pause and png_process_data_skip for the benefit of
3238 progressive readers that need to stop data processing or want to optimize
3239 skipping of unread data (e.g., if the reader marks a chunk to be skipped.)
3240
3241 Version 1.5.1beta09 [January 24, 2011]
3242 Enhanced pngvalid, corrected an error in gray_to_rgb, corrected doc error.
3243 pngvalid contains tests of transforms, which tests are currently disabled
3244 because they are incompletely tested. gray_to_rgb was failing to expand
3245 the bit depth for smaller bit depth images; this seems to be a long
3246 standing error and resulted, apparently, in invalid output
3247 (CVE-2011-0408, CERT VU#643140). The documentation did not accurately
3248 describe what libpng really does when converting RGB to gray.
3249
3250 Version 1.5.1beta10 [January 27, 2010]
3251 Fixed incorrect examples of callback prototypes in the manual, that were
3252 introduced in libpng-1.0.0.
3253 In addition the order of the png_get_uint macros with respect to the
3254 relevant function definitions has been reversed. This helps the
3255 preprocessing of the symbol files be more robust. Furthermore, the
3256 symbol file preprocessing now uses -DPNG_NO_USE_READ_MACROS even when
3257 the library may actually be built with PNG_USE_READ_MACROS; this stops
3258 the read macros interfering with the symbol file format.
3259 Made the manual, synopses, and function prototypes use the function
3260 argument names file_gamma, int_file_gamma, and srgb_intent consistently.
3261
3262 Version 1.5.1beta11 [January 28, 2011]
3263 Changed PNG_UNUSED from "param=param;" to "{if(param){}}".
3264 Corrected local variable type in new API png_process_data_skip()
3265 The type was self-evidently incorrect but only causes problems on 64-bit
3266 architectures.
3267 Added transform tests to pngvalid and simplified the arguments.
3268
3269 Version 1.5.1rc01 [January 29, 2011]
3270 No changes.
3271
3272 Version 1.5.1rc02 [January 31, 2011]
3273 Added a request in the manual that applications do not use "png_" or
3274 "PNG_" to begin any of their own symbols.
3275 Changed PNG_UNUSED to "(void)param;" and updated the commentary in pngpriv.h
3276
3277 Version 1.5.1 [February 3, 2011]
3278 No changes.
3279
3280 Version 1.5.2beta01 [February 13, 2011]
3281 More -Wshadow fixes for older gcc compilers. Older gcc versions apparently
3282 check formal parameters names in function declarations (as well as
3283 definitions) to see if they match a name in the global namespace.
3284 Revised PNG_EXPORTA macro to not use an empty parameter, to accommodate the
3285 old VisualC++ preprocessor.
3286 Turned on interlace handling in png_read_png().
3287 Fixed gcc pendantic warnings.
3288 Handle longjmp in Cygwin.
3289 Fixed png_get_current_row_number() in the interlaced case.
3290 Cleaned up ALPHA flags and transformations.
3291 Implemented expansion to 16 bits.
3292
3293 Version 1.5.2beta02 [February 19, 2011]
3294 Fixed mistake in the descriptions of user read_transform and write_transform
3295 function prototypes in the manual. The row_info struct is png_row_infop.
3296 Reverted png_get_current_row_number() to previous (1.5.2beta01) behavior.
3297 Corrected png_get_current_row_number documentation
3298 Fixed the read/write row callback documentation.
3299 This documents the current behavior, where the callback is called after
3300 every row with information pertaining to the next row.
3301
3302 Version 1.5.2beta03 [March 3, 2011]
3303 Fixed scripts/makefile.vcwin32
3304 Updated contrib/pngsuite/README to add the word "modify".
3305 Define PNG_ALLOCATED to blank when _MSC_VER<1300.
3306
3307 Version 1.5.2rc01 [March 19, 2011]
3308 Define remaining attributes to blank when MSC_VER<1300.
3309 ifdef out mask arrays in pngread.c when interlacing is not supported.
3310
3311 Version 1.5.2rc02 [March 22, 2011]
3312 Added a hint to try CPP=/bin/cpp if "cpp -E" fails in scripts/pnglibconf.mak
3313 and in contrib/pngminim/*/makefile, eg., on SunOS 5.10, and removed "strip"
3314 from the makefiles.
3315 Fixed a bug (present since libpng-1.0.7) that makes png_handle_sPLT() fail
3316 to compile when PNG_NO_POINTER_INDEXING is defined (Chubanov Kirill)
3317
3318 Version 1.5.2rc03 [March 24, 2011]
3319 Don't include standard header files in png.h while building the symbol table,
3320 to avoid cpp failure on SunOS (introduced PNG_BUILDING_SYMBOL_TABLE macro).
3321
3322 Version 1.5.2 [March 31, 2011]
3323 No changes.
3324
3325 Version 1.5.3beta01 [April 1, 2011]
3326 Re-initialize the zlib compressor before compressing non-IDAT chunks.
3327 Added API functions (png_set_text_compression_level() and four others) to
3328 set parameters for zlib compression of non-IDAT chunks.
3329
3330 Version 1.5.3beta02 [April 3, 2011]
3331 Updated scripts/symbols.def with new API functions.
3332 Only compile the new zlib re-initializing code when text or iCCP is
3333 supported, using PNG_WRITE_COMPRESSED_TEXT_SUPPORTED macro.
3334 Improved the optimization of the zlib CMF byte (see libpng-1.2.6beta03).
3335 Optimize the zlib CMF byte in non-IDAT compressed chunks
3336
3337 Version 1.5.3beta03 [April 16, 2011]
3338 Fixed gcc -ansi -pedantic compile. A strict ANSI system does not have
3339 snprintf, and the "__STRICT_ANSI__" detects that condition more reliably
3340 than __STDC__ (John Bowler).
3341 Removed the PNG_PTR_NORETURN attribute because it too dangerous. It tells
3342 the compiler that a user supplied callback (the error handler) does not
3343 return, yet there is no guarantee in practice that the application code
3344 will correctly implement the error handler because the compiler only
3345 issues a warning if there is a mistake (John Bowler).
3346 Removed the no-longer-used PNG_DEPSTRUCT macro.
3347 Updated the zlib version to 1.2.5 in the VStudio project.
3348 Fixed 64-bit builds where png_uint_32 is smaller than png_size_t in
3349 pngwutil.c (John Bowler).
3350 Fixed bug with stripping the filler or alpha channel when writing, that
3351 was introduced in libpng-1.5.2beta01 (bug report by Andrew Church).
3352
3353 Version 1.5.3beta04 [April 27, 2011]
3354 Updated pngtest.png with the new zlib CMF optimization.
3355 Cleaned up conditional compilation code and of background/gamma handling
3356 Internal changes only except a new option to avoid compiling the
3357 png_build_grayscale_palette API (which is not used at all internally.)
3358 The main change is to move the transform tests (READ_TRANSFORMS,
3359 WRITE_TRANSFORMS) up one level to the caller of the APIs. This avoids
3360 calls to spurious functions if all transforms are disabled and slightly
3361 simplifies those functions. Pngvalid modified to handle this.
3362 A minor change is to stop the strip_16 and expand_16 interfaces from
3363 disabling each other; this allows the future alpha premultiplication
3364 code to use 16-bit intermediate values while still producing 8-bit output.
3365 png_do_background and png_do_gamma have been simplified to take a single
3366 pointer to the png_struct rather than pointers to every item required
3367 from the png_struct. This makes no practical difference to the internal
3368 code.
3369 A serious bug in the pngvalid internal routine 'standard_display_init' has
3370 been fixed - this failed to initialize the red channel and accidentally
3371 initialized the alpha channel twice.
3372 Changed png_struct jmp_buf member name from png_jmpbuf to tmp_jmpbuf to
3373 avoid a possible clash with the png_jmpbuf macro on some platforms.
3374
3375 Version 1.5.3beta05 [May 6, 2011]
3376 Added the "_POSIX_SOURCE" feature test macro to ensure libpng sees the
3377 correct API. _POSIX_SOURCE is defined in pngpriv.h, pngtest.c and
3378 pngvalid.c to ensure that POSIX conformant systems disable non-POSIX APIs.
3379 Removed png_snprintf and added formatted warning messages. This change adds
3380 internal APIs to allow png_warning messages to have parameters without
3381 requiring the host OS to implement snprintf. As a side effect the
3382 dependency of the tIME-supporting RFC1132 code on stdio is removed and
3383 PNG_NO_WARNINGS does actually work now.
3384 Pass "" instead of '\0' to png_default_error() in png_err(). This mistake
3385 was introduced in libpng-1.2.20beta01. This fixes CVE-2011-2691.
3386 Added PNG_WRITE_OPTIMIZE_CMF_SUPPORTED macro to make the zlib "CMF" byte
3387 optimization configureable.
3388 IDAT compression failed if preceded by a compressed text chunk (bug
3389 introduced in libpng-1.5.3beta01-02). This was because the attempt to
3390 reset the zlib stream in png_write_IDAT happened after the first IDAT
3391 chunk had been deflated - much too late. In this change internal
3392 functions were added to claim/release the z_stream and, hopefully, make
3393 the code more robust. Also deflateEnd checking is added - previously
3394 libpng would ignore an error at the end of the stream.
3395
3396 Version 1.5.3beta06 [May 8, 2011]
3397 Removed the -D_ALL_SOURCE from definitions for AIX in CMakeLists.txt
3398 Implemented premultiplied alpha support: png_set_alpha_mode API
3399
3400 Version 1.5.3beta07 [May 11, 2011]
3401 Added expand_16 support to the high level interface.
3402 Added named value and 'flag' gamma support to png_set_gamma. Made a minor
3403 change from the previous (unreleased) ABI/API to hide the exact value used
3404 for Macs - it's not a good idea to embed this in the ABI!
3405 Moved macro definitions for PNG_HAVE_IHDR, PNG_HAVE_PLTE, and PNG_AFTER_IDAT
3406 from pngpriv.h to png.h because they must be visible to applications
3407 that call png_set_unknown_chunks().
3408 Check for up->location !PNG_AFTER_IDAT when writing unknown chunks
3409 before IDAT.
3410
3411 Version 1.5.3beta08 [May 16, 2011]
3412 Improved "pngvalid --speed" to exclude more of pngvalid from the time.
3413 Documented png_set_alpha_mode(), other changes in libpng.3/libpng-manual.txt
3414 The cHRM chunk now sets the defaults for png_set_rgb_to_gray() (when negative
3415 parameters are supplied by the caller), while in the absence of cHRM
3416 sRGB/Rec 709 values are still used. This introduced a divide-by-zero
3417 bug in png_handle_cHRM().
3418 The bKGD chunk no longer overwrites the background value set by
3419 png_set_background(), allowing the latter to be used before the file
3420 header is read. It never performed any useful function to override
3421 the default anyway.
3422 Added memory overwrite and palette image checks to pngvalid.c
3423 Previously palette image code was poorly checked. Since the transformation
3424 code has a special palette path in most cases this was a severe weakness.
3425 Minor cleanup and some extra checking in pngrutil.c and pngrtran.c. When
3426 expanding an indexed image, always expand to RGBA if transparency is
3427 present.
3428
3429 Version 1.5.3beta09 [May 17, 2011]
3430 Reversed earlier 1.5.3 change of transformation order; move png_expand_16
3431 back where it was. The change doesn't work because it requires 16-bit
3432 gamma tables when the code only generates 8-bit ones. This fails
3433 silently; the libpng code just doesn't do any gamma correction. Moving
3434 the tests back leaves the old, inaccurate, 8-bit gamma calculations, but
3435 these are clearly better than none!
3436
3437 Version 1.5.3beta10 [May 20, 2011]
3438
3439 png_set_background() and png_expand_16() did not work together correctly.
3440 This problem is present in 1.5.2; if png_set_background is called with
3441 need_expand false and the matching 16 bit color libpng erroneously just
3442 treats it as an 8-bit color because of where png_do_expand_16 is in the
3443 transform list. This simple fix reduces the supplied colour to 8-bits,
3444 so it gets smashed, but this is better than the current behavior.
3445 Added tests for expand16, more fixes for palette image tests to pngvalid.
3446 Corrects the code for palette image tests and disables attempts to
3447 validate palette colors.
3448
3449 Version 1.5.3rc01 [June 3, 2011]
3450 No changes.
3451
3452 Version 1.5.3rc02 [June 8, 2011]
3453 Fixed uninitialized memory read in png_format_buffer() (Bug report by
3454 Frank Busse, CVE-2011-2501, related to CVE-2004-0421).
3455
3456 Version 1.5.3beta11 [June 11, 2011]
3457 Fixed png_handle_sCAL which is broken in 1.5. This fixes CVE 2011-2692.
3458 Added sCAL to pngtest.png
3459 Revised documentation about png_set_user_limits() to say that it also affects
3460 png writing.
3461 Revised handling of png_set_user_limits() so that it can increase the
3462 limit beyond the PNG_USER_WIDTH|HEIGHT_MAX; previously it could only
3463 reduce it.
3464 Make the 16-to-8 scaling accurate. Dividing by 256 with no rounding is
3465 wrong (high by one) 25% of the time. Dividing by 257 with rounding is
3466 wrong in 128 out of 65536 cases. Getting the right answer all the time
3467 without division is easy.
3468 Added "_SUPPORTED" to the PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION macro.
3469 Added projects/owatcom, an IDE project for OpenWatcom to replace
3470 scripts/makefile.watcom. This project works with OpenWatcom 1.9. The
3471 IDE autogenerates appropriate makefiles (libpng.mk) for batch processing.
3472 The project is configurable, unlike the Visual Studio project, so long
3473 as the developer has an awk.
3474 Changed png_set_gAMA to limit the gamma value range so that the inverse
3475 of the stored value cannot overflow the fixed point representation,
3476 and changed other things OpenWatcom warns about.
3477 Revised pngvalid.c to test PNG_ALPHA_MODE_SUPPORTED correctly. This allows
3478 pngvalid to build when ALPHA_MODE is not supported, which is required if
3479 it is to build on libpng 1.4.
3480 Removed string/memory macros that are no longer used and are not
3481 necessarily fully supportable, particularly png_strncpy and png_snprintf.
3482 Added log option to pngvalid.c and attempted to improve gamma messages.
3483
3484 Version 1.5.3 [omitted]
3485 People found the presence of a beta release following an rc release
3486 to be confusing; therefore we bump the version to libpng-1.5.4beta01
3487 and there will be no libpng-1.5.3 release.
3488
3489 Version 1.5.4beta01 [June 14, 2011]
3490 Made it possible to undefine PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
3491 to get the same (inaccurate) output as libpng-1.5.2 and earlier.
3492 Moved definitions of PNG_HAVE_IHDR, PNG_AFTER_IDAT, and PNG_HAVE_PLTE
3493 outside of an unknown-chunk block in png.h because they are also
3494 needed for other uses.
3495
3496 Version 1.5.4beta02 [June 14, 2011]
3497 Fixed and clarified LEGACY 16-to-8 scaling code.
3498 Added png_set_chop_16() API, to match inaccurate results from previous
3499 libpng versions.
3500 Removed the ACCURATE and LEGACY options (they are no longer useable)
3501 Use the old scaling method for background if png_set_chop_16() was
3502 called.
3503 Made png_set_chop_16() API removeable by disabling PNG_CHOP_16_TO_8_SUPPORTED
3504
3505 Version 1.5.4beta03 [June 15, 2011]
3506 Fixed a problem in png_do_expand_palette() exposed by optimization in
3507 1.5.3beta06
3508 Also removed a spurious and confusing "trans" member ("trans") from png_info.
3509 The palette expand optimization prevented expansion to an intermediate RGBA
3510 form if tRNS was present but alpha was marked to be stripped; this exposed
3511 a check for tRNS in png_do_expand_palette() which is inconsistent with the
3512 code elsewhere in libpng.
3513 Correction to the expand_16 code; removed extra instance of
3514 png_set_scale_16_to_8 from pngpriv.h
3515
3516 Version 1.5.4beta04 [June 16, 2011]
3517 Added a missing "#ifdef PNG_READ_BACKGROUND_SUPPORTED/#endif" in pngrtran.c
3518 Added PNG_TRANSFORM_CHOP_16 to the high-level read transforms.
3519 Made PNG_READ_16_TO_8_ACCURATE_SCALE configurable again. If this is
3520 not enabled, png_set_strip_16() and png_do_scale_16_to_8() aren't built.
3521 Revised contrib/visupng, gregbook, and pngminim to demonstrate chop_16_to_8
3522
3523 Version 1.5.4beta05 [June 16, 2011]
3524 Renamed png_set_strip_16() to png_set_scale_16() and renamed
3525 png_set_chop_16() to png_set_strip(16) in an attempt to minimize the
3526 behavior changes between libpng14 and libpng15.
3527
3528 Version 1.5.4beta06 [June 18, 2011]
3529 Fixed new bug that was causing both strip_16 and scale_16 to be applied.
3530
3531 Version 1.5.4beta07 [June 19, 2011]
3532 Fixed pngvalid, simplified macros, added checking for 0 in sCAL.
3533 The ACCURATE scale macro is no longer defined in 1.5 - call the
3534 png_scale_16_to_8 API. Made sure that PNG_READ_16_TO_8 is still defined
3535 if the png_strip_16_to_8 API is present. png_check_fp_number now
3536 maintains some state so that positive, negative and zero values are
3537 identified. sCAL uses these to be strictly spec conformant.
3538
3539 Version 1.5.4beta08 [June 23, 2011]
3540 Fixed pngvalid if ACCURATE_SCALE is defined.
3541 Updated scripts/pnglibconf.h.prebuilt.
3542
3543 Version 1.5.4rc01 [June 30, 2011]
3544 Define PNG_ALLOCATED to "restrict" only if MSC_VER >= 1400.
3545
3546 Version 1.5.4 [July 7, 2011]
3547 No changes.
3548
3549 Version 1.5.5beta01 [July 13, 2011]
3550 Fixed some typos and made other minor changes in the manual.
3551 Updated contrib/pngminus/makefile.std (Samuli Souminen)
3552
3553 Version 1.5.5beta02 [July 14, 2011]
3554 Revised Makefile.am and Makefile.in to look in the right directory for
3555 pnglibconf.h.prebuilt
3556
3557 Version 1.5.5beta03 [July 27, 2011]
3558 Enabled compilation with g++ compiler. This compiler does not recognize
3559 the file extension, so it always compiles with C++ rules. Made minor
3560 changes to pngrutil.c to cast results where C++ expects it but C does not.
3561 Minor editing of libpng.3 and libpng-manual.txt.
3562
3563 Version 1.5.5beta04 [July 29, 2011]
3564 Revised CMakeLists.txt (Clifford Yapp)
3565 Updated commentary about the png_rgb_to_gray() default coefficients
3566 in the manual and in pngrtran.c
3567
3568 Version 1.5.5beta05 [August 17, 2011]
3569 Prevent unexpected API exports from non-libpng DLLs on Windows. The "_DLL"
3570 is removed from the test of whether a DLL is being built (this erroneously
3571 caused the libpng APIs to be marked as DLL exports in static builds under
3572 Microsoft Visual Studio). Almost all of the libpng building configuration
3573 is moved from pngconf.h to pngpriv.h, but PNG_DLL_EXPORT remains in
3574 pngconf.h, though, so that it is colocated with the import definition (it
3575 is no longer used anywhere in the installed headers). The VStudio project
3576 definitions have been cleaned up: "_USRDLL" has been removed from the
3577 static library builds (this was incorrect), and PNG_USE_DLL has been added
3578 to pngvalid to test the functionality (pngtest does not supply it,
3579 deliberately). The spurious "_EXPORTS" has been removed from the
3580 libpng build (all these errors were a result of copy/paste between project
3581 configurations.)
3582 Added new types and internal functions for CIE RGB end point handling to
3583 pngpriv.h (functions yet to be implemented).
3584
3585 Version 1.5.5beta06 [August 26, 2011]
3586 Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set in CMakeLists.txt
3587 (Clifford Yap)
3588 Fixes to rgb_to_gray and cHRM XYZ APIs (John Bowler):
3589 The rgb_to_gray code had errors when combined with gamma correction.
3590 Some pixels were treated as true grey when they weren't and such pixels
3591 and true grey ones were not gamma corrected (the original value of the
3592 red component was used instead). APIs to get and set cHRM using color
3593 space end points have been added and the rgb_to_gray code that defaults
3594 based on cHRM, and the divide-by-zero bug in png_handle_cHRM (CERT
3595 VU#477046, CVE-2011-3328, introduced in 1.5.4) have been corrected.
3596 A considerable number of tests has been added to pngvalid for the
3597 rgb_to_gray transform.
3598 Arithmetic errors in rgb_to_gray whereby the calculated gray value was
3599 truncated to the bit depth rather than rounded have been fixed except in
3600 the 8-bit non-gamma-corrected case (where consistency seems more important
3601 than correctness.) The code still has considerable inaccuracies in the
3602 8-bit case because 8-bit linear arithmetic is used.
3603
3604 Version 1.5.5beta07 [September 7, 2011]
3605 Added "$(ARCH)" option to makefile.darwin
3606 Added SunOS support to configure.ac and Makefile.am
3607 Changed png_chunk_benign_error() to png_warning() in png.c, in
3608 png_XYZ_from_xy_checked().
3609
3610 Version 1.5.5beta08 [September 10, 2011]
3611 Fixed 64-bit compilation errors (gcc). The errors fixed relate
3612 to conditions where types that are 32 bits in the GCC 32-bit
3613 world (uLong and png_size_t) become 64 bits in the 64-bit
3614 world. This produces potential truncation errors which the
3615 compiler correctly flags.
3616 Relocated new HAVE_SOLARIS_LD definition in configure.ac
3617 Constant changes for 64-bit compatibility (removal of L suffixes). The
3618 16-bit cases still use "L" as we don't have a 16-bit test system.
3619
3620 Version 1.5.5rc01 [September 15, 2011]
3621 Removed "L" suffixes in pngpriv.h
3622
3623 Version 1.5.5 [September 22, 2011]
3624 No changes.
3625
3626 Version 1.5.6beta01 [September 22, 2011]
3627 Fixed some 64-bit type conversion warnings in pngrtran.c
3628 Moved row_info from png_struct to a local variable.
3629 The various interlace mask arrays have been made into arrays of
3630 bytes and made PNG_CONST and static (previously some arrays were
3631 marked PNG_CONST and some weren't).
3632 Additional checks have been added to the transform code to validate the
3633 pixel depths after the transforms on both read and write.
3634 Removed some redundant code from pngwrite.c, in png_destroy_write_struct().
3635 Changed chunk reading/writing code to use png_uint_32 instead of png_byte[4].
3636 This removes the need to allocate temporary strings for chunk names on
3637 the stack in the read/write code. Unknown chunk handling still uses the
3638 string form because this is exposed in the API.
3639
3640 Version 1.5.6beta02 [September 26, 2011]
3641 Added a note in the manual the png_read_update_info() must be called only
3642 once with a particular info_ptr.
3643 Fixed a typo in the definition of the new PNG_STRING_FROM_CHUNK(s,c) macro.
3644
3645 Version 1.5.6beta03 [September 28, 2011]
3646 Revised test-pngtest.sh to report FAIL when pngtest fails.
3647 Added "--strict" option to pngtest, to report FAIL when the failure is
3648 only because the resulting valid files are different.
3649 Revised CMakeLists.txt to work with mingw and removed some material from
3650 CMakeLists.txt that is no longer useful in libpng-1.5.
3651
3652 Version 1.5.6beta04 [October 5, 2011]
3653 Fixed typo in Makefile.in and Makefile.am ("-M Wl" should be "-M -Wl")."
3654
3655 Version 1.5.6beta05 [October 12, 2011]
3656 Speed up png_combine_row() for interlaced images. This reduces the generality
3657 of the code, allowing it to be optimized for Adam7 interlace. The masks
3658 passed to png_combine_row() are now generated internally, avoiding
3659 some code duplication and localizing the interlace handling somewhat.
3660 Align png_struct::row_buf - previously it was always unaligned, caused by
3661 a bug in the code that attempted to align it; the code needs to subtract
3662 one from the pointer to take account of the filter byte prepended to
3663 each row.
3664 Optimized png_combine_row() when rows are aligned. This gains a small
3665 percentage for 16-bit and 32-bit pixels in the typical case where the
3666 output row buffers are appropriately aligned. The optimization was not
3667 previously possible because the png_struct buffer was always misaligned.
3668 Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6beta01.
3669
3670 Version 1.5.6beta06 [October 17, 2011]
3671 Removed two redundant tests for unitialized row.
3672 Fixed a relatively harmless memory overwrite in compressed text writing
3673 with a 1 byte zlib buffer.
3674 Add ability to call png_read_update_info multiple times to pngvalid.c.
3675 Fixes for multiple calls to png_read_update_info. These fixes attend to
3676 most of the errors revealed in pngvalid, however doing the gamma work
3677 twice results in inaccuracies that can't be easily fixed. There is now
3678 a warning in the code if this is going to happen.
3679 Turned on multiple png_read_update_info in pngvalid transform tests.
3680 Prevent libpng from overwriting unused bits at the end of the image when
3681 it is not byte aligned, while reading. Prior to libpng-1.5.6 libpng would
3682 overwrite the partial byte at the end of each row if the row width was not
3683 an exact multiple of 8 bits and the image is not interlaced.
3684
3685 Version 1.5.6beta07 [October 21, 2011]
3686 Made png_ptr->prev_row an aligned pointer into png_ptr->big_prev_row
3687 (Mans Rullgard).
3688
3689 Version 1.5.6rc01 [October 26, 2011]
3690 Changed misleading "Missing PLTE before cHRM" warning to "Out of place cHRM"
3691
3692 Version 1.5.6rc02 [October 27, 2011]
3693 Added LSR() macro to defend against buggy compilers that evaluate non-taken
3694 code branches and complain about out-of-range shifts.
3695
3696 Version 1.5.6rc03 [October 28, 2011]
3697 Renamed the LSR() macro to PNG_LSR() and added PNG_LSL() macro.
3698 Fixed compiler warnings with Intel and MSYS compilers. The logical shift
3699 fix for Microsoft Visual C is required by other compilers, so this
3700 enables that fix for all compilers when using compile-time constants.
3701 Under MSYS 'byte' is a name declared in a system header file, so we
3702 changed the name of a local variable to avoid the warnings that result.
3703 Added #define PNG_ALIGN_TYPE PNG_ALIGN_NONE to contrib/pngminim/*/pngusr.h
3704
3705 Version 1.5.6 [November 3, 2011]
3706 No changes.
3707
3708 Version 1.5.7beta01 [November 4, 2011]
3709 Added support for ARM processor, when decoding all PNG up-filtered rows
3710 and any other-filtered rows with 3 or 4 bytes per pixel (Mans Rullgard).
3711 Fixed bug in pngvalid on early allocation failure; fixed type cast in
3712 pngmem.c; pngvalid would attempt to call png_error() if the allocation
3713 of a png_struct or png_info failed. This would probably have led to a
3714 crash. The pngmem.c implementation of png_malloc() included a cast
3715 to png_size_t which would fail on large allocations on 16-bit systems.
3716 Fix for the preprocessor of the Intel C compiler. The preprocessor
3717 splits adjacent @ signs with a space; this changes the concatentation
3718 token from @-@-@ to PNG_JOIN; that should work with all compiler
3719 preprocessors.
3720 Paeth filter speed improvements from work by Siarhei Siamashka. This
3721 changes the 'Paeth' reconstruction function to improve the GCC code
3722 generation on x86. The changes are only part of the suggested ones;
3723 just the changes that definitely improve speed and remain simple.
3724 The changes also slightly increase the clarity of the code.
3725
3726 Version 1.5.7beta02 [November 11, 2011]
3727 Check compression_type parameter in png_get_iCCP and remove spurious
3728 casts. The compression_type parameter is always assigned to, so must
3729 be non-NULL. The cast of the profile length potentially truncated the
3730 value unnecessarily on a 16-bit int system, so the cast of the (byte)
3731 compression type to (int) is specified by ANSI-C anyway.
3732 Fixed FP division by zero in pngvalid.c; the 'test_pixel' code left
3733 the sBIT fields in the test pixel as 0, which resulted in a floating
3734 point division by zero which was irrelevant but causes systems where
3735 FP exceptions cause a crash. Added code to pngvalid to turn on FP
3736 exceptions if the appropriate glibc support is there to ensure this is
3737 tested in the future.
3738 Updated scripts/pnglibconf.mak and scripts/makefile.std to handle the
3739 new PNG_JOIN macro.
3740 Added versioning to pnglibconf.h comments.
3741 Simplified read/write API initial version; basic read/write tested on
3742 a variety of images, limited documentation (in the header file.)
3743 Installed more accurate linear to sRGB conversion tables. The slightly
3744 modified tables reduce the number of 16-bit values that
3745 convert to an off-by-one 8-bit value. The "makesRGB.c" code that was used
3746 to generate the tables is now in a contrib/sRGBtables sub-directory.
3747
3748 Version 1.5.7beta03 [November 17, 2011]
3749 Removed PNG_CONST from the sRGB table declarations in pngpriv.h and png.c
3750 Added run-time detection of NEON support.
3751 Added contrib/libtests; includes simplified API test and timing test and
3752 a color conversion utility for rapid checking of failed 'pngstest' results.
3753 Multiple transform bug fixes plus a work-round for double gamma correction.
3754 libpng does not support more than one transform that requires linear data
3755 at once - if this is tried typically the results is double gamma
3756 correction. Since the simplified APIs can need rgb to gray combined with
3757 a compose operation it is necessary to do one of these outside the main
3758 libpng transform code. This check-in also contains fixes to various bugs
3759 in the simplified APIs themselves and to some bugs in compose and rgb to
3760 gray (on palette) itself.
3761 Fixes for C++ compilation using g++ When libpng source is compiled
3762 using g++. The compiler imposes C++ rules on the C source; thus it
3763 is desireable to make the source work with either C or C++ rules
3764 without throwing away useful error information. This change adds
3765 png_voidcast to allow C semantic (void*) cases or the corresponding
3766 C++ static_cast operation, as appropriate.
3767 Added --noexecstack to assembler file compilation. GCC does not set
3768 this on assembler compilation, even though it does on C compilation.
3769 This creates security issues if assembler code is enabled; the
3770 work-around is to set it by default in the flags for $(CCAS)
3771 Work around compilers that don't support declaration of const data. Some
3772 compilers fault 'extern const' data declarations (because the data is
3773 not initialized); this turns on const-ness only for compilers where
3774 this is known to work.
3775
3776 Version 1.5.7beta04 [November 17, 2011]
3777 Since the gcc driver does not recognize the --noexecstack flag, we must
3778 use the -Wa prefix to have it passed through to the assembler.
3779 Also removed a duplicate setting of this flag.
3780 Added files that were omitted from the libpng-1.5.7beta03 zip distribution.
3781
3782 Version 1.5.7beta05 [November 25, 2011]
3783 Removed "zTXt" from warning in generic chunk decompression function.
3784 Validate time settings passed to png_set_tIME() and png_convert_to_rfc1123()
3785 (Frank Busse). Note: This prevented CVE-2015-7981 from affecting
3786 libpng-1.5.7 and later.
3787 Added MINGW support to CMakeLists.txt
3788 Reject invalid compression flag or method when reading the iTXt chunk.
3789 Backed out 'simplified' API changes. The API seems too complex and there
3790 is a lack of consensus or enthusiasm for the proposals. The API also
3791 reveals significant bugs inside libpng (double gamma correction and the
3792 known bug of being unable to retrieve a corrected palette). It seems
3793 better to wait until the bugs, at least, are corrected.
3794 Moved pngvalid.c into contrib/libtests
3795 Rebuilt Makefile.in, configure, etc., with autoconf-2.68
3796
3797 Version 1.5.7rc01 [December 1, 2011]
3798 Replaced an "#if" with "#ifdef" in pngrtran.c
3799 Revised #if PNG_DO_BC block in png.c (use #ifdef and add #else)
3800
3801 Version 1.5.7rc02 [December 5, 2011]
3802 Revised project files and contrib/pngvalid/pngvalid.c to account for
3803 the relocation of pngvalid into contrib/libtests.
3804 Revised pngconf.h to use " __declspec(restrict)" only when MSC_VER >= 1400,
3805 as in libpng-1.5.4.
3806 Put CRLF line endings in the owatcom project files.
3807
3808 Version 1.5.7rc03 [December 7, 2011]
3809 Updated CMakeLists.txt to account for the relocation of pngvalid.c
3810
3811 Version 1.5.7 [December 15, 2011]
3812 Minor fixes to pngvalid.c for gcc 4.6.2 compatibility to remove warnings
3813 reported by earlier versions.
3814 Fixed minor memset/sizeof errors in pngvalid.c.
3815
3816 Version 1.6.0beta01 [December 15, 2011]
3817 Removed machine-generated configure files from the GIT repository (they will
3818 continue to appear in the tarball distributions and in the libpng15 and
3819 earlier GIT branches).
3820 Restored the new 'simplified' API, which was started in libpng-1.5.7beta02
3821 but later deleted from libpng-1.5.7beta05.
3822 Added example programs for the new 'simplified' API.
3823 Added ANSI-C (C90) headers and require them, and take advantage of the
3824 change. Also fixed some of the projects/* and contrib/* files that needed
3825 updates for libpng16 and the move of pngvalid.c.
3826 With this change the required ANSI-C header files are assumed to exist: the
3827 implementation must provide float.h, limits.h, stdarg.h and stddef.h and
3828 libpng relies on limits.h and stddef.h existing and behaving as defined
3829 (the other two required headers aren't used). Non-ANSI systems that don't
3830 have stddef.h or limits.h will have to provide an appropriate fake
3831 containing the relevant types and #defines.
3832 Dropped support for 16-bit platforms. The use of FAR/far has been eliminated
3833 and the definition of png_alloc_size_t is now controlled by a flag so
3834 that 'small size_t' systems can select it if necessary. Libpng 1.6 may
3835 not currently work on such systems -- it seems likely that it will
3836 ask 'malloc' for more than 65535 bytes with any image that has a
3837 sufficiently large row size (rather than simply failing to read such
3838 images).
3839 New tools directory containing tools used to generate libpng code.
3840 Fixed race conditions in parallel make builds. With higher degrees of
3841 parallelism during 'make' the use of the same temporary file names such
3842 as 'dfn*' can result in a race where a temporary file from one arm of the
3843 build is deleted or overwritten in another arm. This changes the
3844 temporary files for suffix rules to always use $* and ensures that the
3845 non-suffix rules use unique file names.
3846
3847 Version 1.6.0beta02 [December 21, 2011]
3848 Correct configure builds where build and source directories are separate.
3849 The include path of 'config.h' was erroneously made relative in pngvalid.c
3850 in libpng 1.5.7.
3851
3852 Version 1.6.0beta03 [December 22, 2011]
3853 Start-up code size improvements, error handler flexibility. These changes
3854 alter how the tricky allocation of the initial png_struct and png_info
3855 structures are handled. png_info is now handled in pretty much the same
3856 way as everything else, except that the allocations handle NULL return
3857 silently. png_struct is changed in a similar way on allocation and on
3858 deallocation a 'safety' error handler is put in place (which should never
3859 be required). The error handler itself is changed to permit mismatches
3860 in the application and libpng error buffer size; however, this means a
3861 silent change to the API to return the jmp_buf if the size doesn't match
3862 the size from the libpng compilation; libpng now allocates the memory and
3863 this may fail. Overall these changes result in slight code size
3864 reductions; however, this is a reduction in code that is always executed
3865 so is particularly valuable. Overall on a 64-bit system the libpng DLL
3866 decreases in code size by 1733 bytes. pngerror.o increases in size by
3867 about 465 bytes because of the new functionality.
3868 Added png_convert_to_rfc1123_buffer() and deprecated png_convert_to_rfc1123()
3869 to avoid including a spurious buffer in the png_struct.
3870
3871 Version 1.6.0beta04 [December 30, 2011]
3872 Regenerated configure scripts with automake-1.11.2
3873 Eliminated png_info_destroy(). It is now used only in png.c and only calls
3874 one other internal function and memset().
3875 Enabled png_get_sCAL_fixed() if floating point APIs are enabled. Previously
3876 it was disabled whenever internal fixed point arithmetic was selected,
3877 which meant it didn't exist even on systems where FP was available but not
3878 preferred.
3879 Added pngvalid.c compile time checks for const APIs.
3880 Implemented 'restrict' for png_info and png_struct. Because of the way
3881 libpng works both png_info and png_struct are always accessed via a
3882 single pointer. This means adding C99 'restrict' to the pointer gives
3883 the compiler some opportunity to optimize the code. This change allows
3884 that.
3885 Moved AC_MSG_CHECKING([if libraries can be versioned]) later to the proper
3886 location in configure.ac (Gilles Espinasse).
3887 Changed png_memcpy to C assignment where appropriate. Changed all those
3888 uses of png_memcpy that were doing a simple assignment to assignments
3889 (all those cases where the thing being copied is a non-array C L-value).
3890 Added some error checking to png_set_*() routines.
3891 Removed the reference to the non-exported function png_memcpy() from
3892 example.c.
3893 Fixed the Visual C 64-bit build - it requires jmp_buf to be aligned, but
3894 it had become misaligned.
3895 Revised contrib/pngminus/pnm2png.c to avoid warnings when png_uint_32
3896 and unsigned long are of different sizes.
3897
3898 Version 1.6.0beta05 [January 15, 2012]
3899 Updated manual with description of the simplified API (copied from png.h)
3900 Fix bug in pngerror.c: some long warnings were being improperly truncated
3901 (CVE-2011-3464, bug introduced in libpng-1.5.3beta05).
3902
3903 Version 1.6.0beta06 [January 24, 2012]
3904 Added palette support to the simplified APIs. This commit
3905 changes some of the macro definitions in png.h, app code
3906 may need corresponding changes.
3907 Increased the formatted warning buffer to 192 bytes.
3908 Added color-map support to simplified API. This is an initial version for
3909 review; the documentation has not yet been updated.
3910 Fixed Min/GW uninstall to remove libpng.dll.a
3911
3912 Version 1.6.0beta07 [January 28, 2012]
3913 Eliminated Intel icc/icl compiler warnings. The Intel (GCC derived)
3914 compiler issues slightly different warnings from those issued by the
3915 current vesions of GCC. This eliminates those warnings by
3916 adding/removing casts and small code rewrites.
3917 Updated configure.ac from autoupdate: added --enable-werror option.
3918 Also some layout regularization and removal of introduced tab characters
3919 (replaced with 3-character indentation). Obsolete macros identified by
3920 autoupdate have been removed; the replacements are all in 2.59 so
3921 the pre-req hasn't been changed. --enable-werror checks for support
3922 for -Werror (or the given argument) in the compiler. This mimics the
3923 gcc configure option by allowing -Werror to be turned on safely; without
3924 the option the tests written in configure itself fail compilation because
3925 they cause compiler warnings.
3926 Rewrote autogen.sh to run autoreconf instead of running tools one-by-one.
3927 Conditionalize the install rules for MINGW and CYGWIN in CMakeLists.txt and
3928 set CMAKE_LIBRARY_OUTPUT_DIRECTORY to "lib" on all platforms (C. Yapp).
3929 Freeze libtool files in the 'scripts' directory. This version of autogen.sh
3930 attempts to dissuade people from running it when it is not, or should not,
3931 be necessary. In fact, autogen.sh does not work when run in a libpng
3932 directory extracted from a tar distribution anymore. You must run it in
3933 a GIT clone instead.
3934 Added two images to contrib/pngsuite (1-bit and 2-bit transparent grayscale),
3935 and renamed three whose names were inconsistent with those in
3936 pngsuite/README.txt.
3937
3938 Version 1.6.0beta08 [February 1, 2012]
3939 Fixed Image::colormap misalignment in pngstest.c
3940 Check libtool/libtoolize version number (2.4.2) in configure.ac
3941 Divide test-pngstest.sh into separate pngstest runs for basic and
3942 transparent images.
3943 Moved automake options to AM_INIT_AUTOMAKE in configure.ac
3944 Added color-tests, silent-rules (Not yet implemented in Makefile.am) and
3945 version checking to configure.ac
3946 Improved pngstest speed by not doing redundant tests and add const to
3947 the background parameter of png_image_finish_read. The --background
3948 option is now done automagically only when required, so that commandline
3949 option no longer exists.
3950 Cleaned up pngpriv.h to consistently declare all functions and data.
3951 Also eliminated PNG_CONST_DATA, which is apparently not needed but we
3952 can't be sure until it is gone.
3953 Added symbol prefixing that allows all the libpng external symbols
3954 to be prefixed (suggested by Reuben Hawkins).
3955 Updated "ftbb*.png" list in the owatcom and vstudio projects.
3956 Fixed 'prefix' builds on clean systems. The generation of pngprefix.h
3957 should not require itself.
3958 Updated INSTALL to explain that autogen.sh must be run in a GIT clone,
3959 not in a libpng directory extracted from a tar distribution.
3960
3961 Version 1.6.0beta09 [February 1, 2012]
3962 Reverted the prebuilt configure files to libpng-1.6.0beta05 condition.
3963
3964 Version 1.6.0beta10 [February 3, 2012]
3965 Added Z_SOLO for zlib-1.2.6+ and correct pngstest tests
3966 Updated list of test images in CMakeLists.txt
3967 Updated the prebuilt configure files to current condition.
3968 Revised INSTALL information about autogen.sh; it works in tar distributions.
3969
3970 Version 1.6.0beta11 [February 16, 2012]
3971 Fix character count in pngstest command in projects/owatcom/pngstest.tgt
3972 Revised test-pngstest.sh to report PASS/FAIL for each image.
3973 Updated documentation about the simplified API.
3974 Corrected estimate of error in libpng png_set_rgb_to_gray API. The API is
3975 extremely inaccurate for sRGB conversions because it uses an 8-bit
3976 intermediate linear value and it does not use the sRGB transform, so it
3977 suffers from the known instability in gamma transforms for values close
3978 to 0 (see Poynton). The net result is that the calculation has a maximum
3979 error of 14.99/255; 0.5/255^(1/2.2). pngstest now uses 15 for the
3980 permitted 8-bit error. This may still not be enough because of arithmetic
3981 error.
3982 Removed some unused arrays (with #ifdef) from png_read_push_finish_row().
3983 Fixed a memory overwrite bug in simplified read of RGB PNG with
3984 non-linear gamma Also bugs in the error checking in pngread.c and changed
3985 quite a lot of the checks in pngstest.c to be correct; either correctly
3986 written or not over-optimistic. The pngstest changes are insufficient to
3987 allow all possible RGB transforms to be passed; pngstest cmppixel needs
3988 to be rewritten to make it clearer which errors it allows and then changed
3989 to permit known inaccuracies.
3990 Removed tests for no-longer-used *_EMPTY_PLTE_SUPPORTED from pngstruct.h
3991 Fixed fixed/float API export conditionals. 1) If FIXED_POINT or
3992 FLOATING_POINT options were switched off, png.h ended up with lone ';'
3993 characters. This is not valid ANSI-C outside a function. The ';'
3994 characters have been moved inside the definition of PNG_FP_EXPORT and
3995 PNG_FIXED_EXPORT. 2) If either option was switched off, the declaration
3996 of the corresponding functions were completely omitted, even though some
3997 of them are still used internally. The result is still valid, but
3998 produces warnings from gcc with some warning options (including -Wall). The
3999 fix is to cause png.h to declare the functions with PNG_INTERNAL_FUNCTION
4000 when png.h is included from pngpriv.h.
4001 Check for invalid palette index while reading paletted PNG. When one is
4002 found, issue a warning and increase png_ptr->num_palette accordingly.
4003 Apps are responsible for checking to see if that happened.
4004
4005 Version 1.6.0beta12 [February 18, 2012]
4006 Do not increase num_palette on invalid_index.
4007 Relocated check for invalid palette index to pngrtran.c, after unpacking
4008 the sub-8-bit pixels.
4009 Fixed CVE-2011-3026 buffer overrun bug. This bug was introduced when
4010 iCCP chunk support was added at libpng-1.0.6. Deal more correctly with the
4011 test on iCCP chunk length. Also removed spurious casts that may hide
4012 problems on 16-bit systems.
4013
4014 Version 1.6.0beta13 [February 24, 2012]
4015 Eliminated redundant png_push_read_tEXt|zTXt|iTXt|unknown code from
4016 pngpread.c and use the sequential png_handle_tEXt, etc., in pngrutil.c;
4017 now that png_ptr->buffer is inaccessible to applications, the special
4018 handling is no longer useful.
4019 Added PNG_SAFE_LIMITS feature to pnglibconf.dfa, pngpriv.h, and new
4020 pngusr.dfa to reset the user limits to safe ones if PNG_SAFE_LIMITS is
4021 defined. To enable, use "CPPFLAGS=-DPNG_SAFE_LIMITS_SUPPORTED=1" on the
4022 configure command or put #define PNG_SAFE_LIMITS_SUPPORTED in
4023 pnglibconf.h.prebuilt and pnglibconf.h.
4024
4025 Version 1.6.0beta14 [February 27, 2012]
4026 Added information about the new limits in the manual.
4027 Updated Makefile.in
4028
4029 Version 1.6.0beta15 [March 2, 2012]
4030 Removed unused "current_text" members of png_struct and the png_free()
4031 of png_ptr->current_text from pngread.c
4032 Rewrote pngstest.c for substantial speed improvement.
4033 Fixed transparent pixel and 16-bit rgb tests in pngstest and removed a
4034 spurious check in pngwrite.c
4035 Added PNG_IMAGE_FLAG_FAST for the benefit of applications that store
4036 intermediate files, or intermediate in-memory data, while processing
4037 image data with the simplified API. The option makes the files larger
4038 but faster to write and read. pngstest now uses this by default; this
4039 can be disabled with the --slow option.
4040 Improved pngstest fine tuning of error numbers, new test file generator.
4041 The generator generates images that test the full range of sample values,
4042 allow the error numbers in pngstest to be tuned and checked. makepng
4043 also allows generation of images with extra chunks, although this is
4044 still work-in-progress.
4045 Added check for invalid palette index while reading.
4046 Fixed some bugs in ICC profile writing. The code should now accept
4047 all potentially valid ICC profiles and reject obviously invalid ones.
4048 It now uses png_error() to do so rather than casually writing a PNG
4049 without the necessary color data.
4050 Removed whitespace from the end of lines in all source files and scripts.
4051
4052 Version 1.6.0beta16 [March 6, 2012]
4053 Relocated palette-index checking function from pngrutil.c to pngtrans.c
4054 Added palette-index checking while writing.
4055 Changed png_inflate() and calling routines to avoid overflow problems.
4056 This is an intermediate check-in that solves the immediate problems and
4057 introduces one performance improvement (avoiding a copy via png_ptr->zbuf.)
4058 Further changes will be made to make ICC profile handling more secure.
4059 Fixed build warnings (MSVC, GCC, GCC v3). Cygwin GCC with default options
4060 declares 'index' as a global, causing a warning if it is used as a local
4061 variable. GCC 64-bit warns about assigning a (size_t) (unsigned 64-bit)
4062 to an (int) (signed 32-bit). MSVC, however, warns about using the
4063 unary '-' operator on an unsigned value (even though it is well defined
4064 by ANSI-C to be ~x+1). The padding calculation was changed to use a
4065 different method. Removed the tests on png_ptr->pass.
4066 Added contrib/libtests/tarith.c to test internal arithmetic functions from
4067 png.c. This is a libpng maintainer program used to validate changes to the
4068 internal arithmetic functions.
4069 Made read 'inflate' handling like write 'deflate' handling. The read
4070 code now claims and releases png_ptr->zstream, like the write code.
4071 The bug whereby the progressive reader failed to release the zstream
4072 is now fixed, all initialization is delayed, and the code checks for
4073 changed parameters on deflate rather than always calling
4074 deflatedEnd/deflateInit.
4075 Validate the zTXt strings in pngvalid.
4076 Added code to validate the windowBits value passed to deflateInit2().
4077 If the call to deflateInit2() is wrong a png_warning will be issued
4078 (in fact this is harmless, but the PNG data produced may be sub-optimal).
4079
4080 Version 1.6.0beta17 [March 10, 2012]
4081 Fixed PNG_LIBPNG_BUILD_BASE_TYPE definition.
4082 Reject all iCCP chunks after the first, even if the first one is invalid.
4083 Deflate/inflate was reworked to move common zlib calls into single
4084 functions [rw]util.c. A new shared keyword check routine was also added
4085 and the 'zbuf' is no longer allocated on progressive read. It is now
4086 possible to call png_inflate() incrementally. A warning is no longer
4087 issued if the language tag or translated keyword in the iTXt chunk
4088 has zero length.
4089 If benign errors are disabled use maximum window on ancilliary inflate.
4090 This works round a bug introduced in 1.5.4 where compressed ancillary
4091 chunks could end up with a too-small windowBits value in the deflate
4092 header.
4093
4094 Version 1.6.0beta18 [March 16, 2012]
4095 Issue a png_benign_error() instead of png_warning() about bad palette index.
4096 In pngtest, treat benign errors as errors if "-strict" is present.
4097 Fixed an off-by-one error in the palette index checking function.
4098 Fixed a compiler warning under Cygwin (Windows-7, 32-bit system)
4099 Revised example.c to put text strings in a temporary character array
4100 instead of directly assigning string constants to png_textp members.
4101 This avoids compiler warnings when -Wwrite-strings is enabled.
4102 Added output flushing to aid debugging under Visual Studio. Unfortunately
4103 this is necessary because the VS2010 output window otherwise simply loses
4104 the error messages on error (they weren't flushed to the window before
4105 the process exited, apparently!)
4106 Added configuration support for benign errors and changed the read
4107 default. Also changed some warnings in the iCCP and sRGB handling
4108 from to benign errors. Configuration now makes read benign
4109 errors warnings and write benign errors to errors by default (thus
4110 changing the behavior on read). The simplified API always forces
4111 read benign errors to warnings (regardless of the system default, unless
4112 this is disabled in which case the simplified API can't be built.)
4113
4114 Version 1.6.0beta19 [March 18, 2012]
4115 Work around for duplicate row start calls; added warning messages.
4116 This turns on PNG_FLAG_DETECT_UNINITIALIZED to detect app code that
4117 fails to call one of the 'start' routines (not enabled in libpng-1.5
4118 because it is technically an API change, since it did normally work
4119 before.) It also makes duplicate calls to png_read_start_row (an
4120 internal function called at the start of the image read) benign, as
4121 they were before changes to use png_inflate_claim. Somehow webkit is
4122 causing this to happen; this is probably a mis-feature in the zlib
4123 changes so this commit is only a work-round.
4124 Removed erroneous setting of DETECT_UNINITIALIZED and added more
4125 checks. The code now does a png_error if an attempt is made to do the
4126 row initialization twice; this is an application error and it has
4127 serious consequences because the transform data in png_struct is
4128 changed by each call.
4129 Added application error reporting and added chunk names to read
4130 benign errors; also added --strict to pngstest - not enabled
4131 yet because a warning is produced.
4132 Avoid the double gamma correction warning in the simplified API.
4133 This allows the --strict option to pass in the pngstest checks
4134
4135 Version 1.6.0beta20 [March 29, 2012]
4136 Changed chunk handler warnings into benign errors, incrementally load iCCP
4137 Added checksum-icc.c to contrib/tools
4138 Prevent PNG_EXPAND+PNG_SHIFT doing the shift twice.
4139 Recognize known sRGB ICC profiles while reading; prefer writing the
4140 iCCP profile over writing the sRGB chunk, controlled by the
4141 PNG_sRGB_PROFILE_CHECKS option.
4142 Revised png_set_text_2() to avoid potential memory corruption (fixes
4143 CVE-2011-3048, also known as CVE-2012-3425).
4144
4145 Version 1.6.0beta21 [April 27, 2012]
4146 Revised scripts/makefile.darwin: use system zlib; remove quotes around
4147 architecture list; add missing ppc architecture; add architecture options
4148 to shared library link; don't try to create a shared lib based on missing
4149 RELEASE variable.
4150 Enable png_set_check_for_invalid_index() for both read and write.
4151 Removed #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED in pngpriv.h around
4152 declaration of png_handle_unknown().
4153 Added -lssp_nonshared in a comment in scripts/makefile.freebsd
4154 and changed deprecated NOOBJ and NOPROFILE to NO_OBJ and NO_PROFILE.
4155
4156 Version 1.6.0beta22 [May 23, 2012]
4157 Removed need for -Wno-cast-align with clang. clang correctly warns on
4158 alignment increasing pointer casts when -Wcast-align is passed. This
4159 fixes the cases that clang warns about either by eliminating the
4160 casts from png_bytep to png_uint_16p (pngread.c), or, for pngrutil.c
4161 where the cast is previously verified or pngstest.c where it is OK, by
4162 introducing new png_aligncast macros to do the cast in a way that clang
4163 accepts.
4164
4165 Version 1.6.0beta23 [June 6, 2012]
4166 Revised CMakeLists.txt to not attempt to make a symlink under mingw.
4167 Made fixes for new optimization warnings from gcc 4.7.0. The compiler
4168 performs an optimization which is safe; however it then warns about it.
4169 Changing the type of 'palette_number' in pngvalid.c removes the warning.
4170 Do not depend upon a GCC feature macro being available for use in generating
4171 the linker mapfile symbol prefix.
4172 Improved performance of new do_check_palette_indexes() function (only
4173 update the value when it actually increases, move test for whether
4174 the check is wanted out of the function.
4175
4176 Version 1.6.0beta24 [June 7, 2012]
4177 Don't check palette indexes if num_palette is 0 (as it can be in MNG files).
4178
4179 Version 1.6.0beta25 [June 16, 2012]
4180 Revised png_set_keep_unknown_chunks() so num_chunks < 0 means ignore all
4181 unknown chunks and all known chunks except for IHDR, PLTE, tRNS, IDAT,
4182 and IEND. Previously it only meant ignore all unknown chunks, the
4183 same as num_chunks == 0. Revised png_image_skip_unused_chunks() to
4184 provide a list of chunks to be processed instead of a list of chunks to
4185 ignore. Revised contrib/gregbook/readpng2.c accordingly.
4186
4187 Version 1.6.0beta26 [July 10, 2012]
4188 Removed scripts/makefile.cegcc from the *.zip and *.7z distributions; it
4189 depends on configure, which is not included in those archives.
4190 Moved scripts/chkfmt to contrib/tools.
4191 Changed "a+w" to "u+w" in Makefile.in to fix CVE-2012-3386.
4192
4193 Version 1.6.0beta27 [August 11, 2012]
4194 Do not compile PNG_DEPRECATED, PNG_ALLOC and PNG_PRIVATE when __GNUC__ < 3.
4195 Do not use __restrict when GNUC is <= 3.1
4196 Removed references to png_zalloc() and png_zfree() from the manual.
4197 Fixed configurations where floating point is completely disabled. Because
4198 of the changes to support symbol prefixing PNG_INTERNAL_FUNCTION declares
4199 floating point APIs during libpng builds even if they are completely
4200 disabled. This requires the png floating point types (png_double*) to be
4201 declared even though the functions are never actually defined. This
4202 change provides a dummy definition so that the declarations work, yet any
4203 implementation will fail to compile because of an incomplete type.
4204 Re-eliminated the use of strcpy() in pngtest.c. An unncessary use of
4205 strcpy() was accidentally re-introduced in libpng16; this change replaces
4206 it with strncpy().
4207 Eliminated use of png_sizeof(); use sizeof() instead.
4208 Use a consistent style for (sizeof type) and (sizeof (array))
4209 Cleanup of png_set_filler(). This function does very different things on
4210 read and write. In libpng 1.6 the two cases can be distinguished and
4211 considerable code cleanup, and extra error checking, is possible. This
4212 makes calls on the write side that have no effect be ignored with a
4213 png_app_error(), which can be disabled in the app using
4214 png_set_benign_errors(), and removes the spurious use of usr_channels
4215 on the read side.
4216 Insist on autotools 1.12.1 for git builds because there are security issues
4217 with 1.12 and insisting on anything less would allow 1.12 to be used.
4218 Removed info_ptr->signature[8] from WRITE-only builds.
4219 Add some conditions for compiling png_fixed(). This is a small function
4220 but it requires "-lm" on some platforms.
4221 Cause pngtest --strict to fail on any warning from libpng (not just errors)
4222 and cause it not to fail at the comparison step if libpng lacks support
4223 for writing chunks that it reads from the input (currently only implemented
4224 for compressed text chunks).
4225 Make all three "make check" test programs work without READ or WRITE support.
4226 Now "make check" will succeed even if libpng is compiled with -DPNG_NO_READ
4227 or -DPNG_NO_WRITE. The tests performed are reduced, but the basic reading
4228 and writing of a PNG file is always tested by one or more of the tests.
4229 Consistently use strlen(), memset(), memcpy(), and memcmp() instead of the
4230 png_strlen(), png_memset(), png_memcpy(), and png_memcmp() macros.
4231 Removed the png_sizeof(), png_strlen(), png_memset(), png_memcpy(), and
4232 png_memcmp() macros.
4233 Work around gcc 3.x and Microsoft Visual Studio 2010 complaints. Both object
4234 to the split initialization of num_chunks.
4235
4236 Version 1.6.0beta28 [August 29, 2012]
4237 Unknown handling fixes and clean up. This adds more correct option
4238 control of the unknown handling, corrects the pre-existing bug where
4239 the per-chunk 'keep' setting is ignored and makes it possible to skip
4240 IDAT chunks in the sequential reader (broken in earlier 1.6 versions).
4241 There is a new test program, test-unknown.c, which is a work in progress
4242 (not currently part of the test suite). Comments in the header files now
4243 explain how the unknown handling works.
4244 Allow fine grain control of unknown chunk APIs. This change allows
4245 png_set_keep_unknown_chunks() to be turned off if not required and causes
4246 both read and write to behave appropriately (on read this is only possible
4247 if the user callback is used to handle unknown chunks). The change
4248 also removes the support for storing unknown chunks in the info_struct
4249 if the only unknown handling enabled is via the callback, allowing libpng
4250 to be configured with callback reading and none of the unnecessary code.
4251 Corrected fix for unknown handling in pngtest. This reinstates the
4252 libpng handling of unknown chunks other than vpAg and sTER (including
4253 unsafe-to-copy chunks which were dropped before) and eliminates the
4254 repositioning of vpAg and sTER in pngtest.png by changing pngtest.png
4255 (so the chunks are where libpng would put them).
4256 Added "tunknown" test and corrected a logic error in png_handle_unknown()
4257 when SAVE support is absent. Moved the shell test scripts for
4258 contrib/libtests from the libpng top directory to contrib/libtests.
4259 png_handle_unknown() must always read or skip the chunk, if
4260 SAVE_UNKNOWN_CHUNKS is turned off *and* the application does not set
4261 a user callback an unknown chunk will not be read, leading to a read
4262 error, which was revealed by the "tunknown" test.
4263 Cleaned up and corrected ICC profile handling.
4264 contrib/libtests/makepng: corrected 'rgb' and 'gray' cases. profile_error
4265 messages could be truncated; made a correct buffer size calculation and
4266 adjusted pngerror.c appropriately. png_icc_check_* checking improved;
4267 changed the functions to receive the correct color type of the PNG on read
4268 or write and check that it matches the color space of the profile (despite
4269 what the comments said before, there is danger in assuming the app will
4270 cope correctly with an RGB profile on a grayscale image and, since it
4271 violates the PNG spec, allowing it is certain to produce inconsistent
4272 app behavior and might even cause app crashes.) Check that profiles
4273 contain the tags needed to process the PNG (tags all required by the ICC
4274 spec). Removed unused PNG_STATIC from pngpriv.h.
4275
4276 Version 1.6.0beta29 [September 4, 2012]
4277 Fixed the simplified API example programs to add the *colormap parameter
4278 to several of he API and improved the error message if the version field
4279 is not set.
4280 Added contrib/examples/* to the *.zip and *.7z distributions.
4281 Updated simplified API synopses and description of the png_image structure
4282 in the manual.
4283 Made makepng and pngtest produce identical PNGs, add "--relaxed" option
4284 to pngtest. The "--relaxed" option turns off the benign errors that are
4285 enabled by default in pre-RC builds. makepng can now write ICC profiles
4286 where the length has not been extended to a multiple of 4, and pngtest
4287 now intercepts all libpng errors, allowing the previously-introduced
4288 "--strict test" on no warnings to actually work.
4289 Improved ICC profile handling including cHRM chunk generation and fixed
4290 Cygwin+MSVC build errors. The ICC profile handling now includes more
4291 checking. Several errors that caused rejection of the profile are now
4292 handled with a warning in such a way that the invalid profiles will be
4293 read by default in release (but not pre-RC) builds but will not be
4294 written by default. The easy part of handling the cHRM chunk is written,
4295 where the ICC profile contains the required data. The more difficult
4296 part plus guessing a gAMA value requires code to pass selected RGB values
4297 through the profile.
4298
4299 Version 1.6.0beta30 [October 24, 2012]
4300 Changed ICC profile matrix/vector types to not depend on array type rules.
4301 By the ANSI-C standard the new types should be identical to the previous
4302 versions, and all known versions of gcc tested with the previous versions
4303 except for GCC-4.2.1 work with this version. The change makes the ANSI-C
4304 rule that const applied to an array of elements applies instead to the
4305 elements in the array moot by explicitly applying const to the base
4306 elements of the png_icc_matrix and png_icc_vector types. The accidental
4307 (harmless) 'const' previously applied to the parameters of two of the
4308 functions have also been removed.
4309 Added a work around for GCC 4.2 optimization bug.
4310 Marked the broken (bad white point) original HP sRGB profiles correctly and
4311 correct comments.
4312 Added -DZ_SOLO to contrib/pngminim/*/makefile to work with zlib-1.2.7
4313 Use /MDd for vstudio debug builds. Also added pngunkown to the vstudio
4314 builds, fixed build errors and corrected a minor exit code error in
4315 pngvalid if the 'touch' file name is invalid.
4316 Add updated WARNING file to projects/vstudio from libpng 1.5/vstudio
4317 Fixed build when using #define PNG_NO_READ_GAMMA in png_do_compose() in
4318 pngrtran.c (Domani Hannes).
4319
4320 Version 1.6.0beta31 [November 1, 2012]
4321 Undid the erroneous change to vstudio/pngvalid build in libpng-1.6.0beta30.
4322 Made pngvalid so that it will build outside the libpng source tree.
4323 Made builds -DPNG_NO_READ_GAMMA compile (the unit tests still fail).
4324 Made PNG_NO_READ_GAMMA switch off interfaces that depend on READ_GAMMA.
4325 Prior to 1.6.0 switching off READ_GAMMA did unpredictable things to the
4326 interfaces that use it (specifically, png_do_background in 1.4 would
4327 simply display composite for grayscale images but do composition
4328 with the incorrect arithmetic for color ones). In 1.6 the semantic
4329 of -DPNG_NO_READ_GAMMA is changed to simply disable any interface that
4330 depends on it; this obliges people who set it to consider whether they
4331 really want it off if they happen to use any of the interfaces in
4332 question (typically most users who disable it won't).
4333 Fixed GUIDs in projects/vstudio. Some were duplicated or missing,
4334 resulting in VS2010 having to update the files.
4335 Removed non-working ICC profile support code that was mostly added to
4336 libpng-1.6.0beta29 and beta30. There was too much code for too little
4337 gain; implementing full ICC color correction may be desireable but is left
4338 up to applications.
4339
4340 Version 1.6.0beta32 [November 25, 2012]
4341 Fixed an intermittent SEGV in pngstest due to an uninitialized array element.
4342 Added the ability for contrib/libtests/makepng.c to make a PNG with just one
4343 color. This is useful for debugging pngstest color inaccuracy reports.
4344 Fixed error checking in the simplified write API (Olaf van der Spek)
4345 Made png_user_version_check() ok to use with libpng version 1.10.x and later.
4346
4347 Version 1.6.0beta33 [December 15, 2012]
4348 Fixed typo in png.c (PNG_SET_CHUNK_MALLOC_MAX should be PNG_CHUNK_MALLOC_MAX)
4349 that causes the MALLOC_MAX limit not to work (John Bowler)
4350 Change png_warning() to png_app_error() in pngwrite.c and comment the
4351 fall-through condition.
4352 Change png_warning() to png_app_warning() in png_write_tRNS().
4353 Rearranged the ARM-NEON optimizations: Isolated the machine specific code
4354 to the hardware subdirectory and added comments to pngrutil.c so that
4355 implementors of other optimizations know what to do.
4356 Fixed cases of unquoted DESTDIR in Makefile.am
4357 Rebuilt Makefile.in, etc., with autoconf-2.69 and automake-1.12.5.
4358
4359 Version 1.6.0beta34 [December 19, 2012]
4360 Cleaned up whitespace in the synopsis portion of the manpage "libpng.3"
4361 Disassembled the version number in scripts/options.awk (necessary for
4362 building on SunOs).
4363
4364 Version 1.6.0beta35 [December 23, 2012]
4365 Made default Zlib compression settings be configurable. This adds #defines to
4366 pnglibconf.h to control the defaults.
4367 Fixed Windows build issues, enabled ARM compilation. Various warnings issued
4368 by earlier versions of GCC fixed for Cygwin and Min/GW (which both use old
4369 GCCs.) ARM support is enabled by default in zlib.props (unsupported by
4370 Microsoft) and ARM compilation is made possible by deleting the check for
4371 x86. The test programs cannot be run because they are not signed.
4372
4373 Version 1.6.0beta36 [January 2, 2013]
4374 Discontinued distributing libpng-1.x.x.tar.bz2.
4375 Discontinued distributing libpng-1.7.0-1.6.0-diff.txt and similar.
4376 Rebuilt configure with autoconf-2.69 (inadvertently not done in beta33)
4377 Fixed 'make distcheck' on SUN OS - libpng.so was not being removed
4378
4379 Version 1.6.0beta37 [January 10, 2013]
4380 Fixed conceivable but difficult to repro overflow. Also added two test
4381 programs to generate and test a PNG which should have the problem.
4382
4383 Version 1.6.0beta39 [January 19, 2013]
4384 Again corrected attempt at overflow detection in png_set_unknown_chunks()
4385 (CVE-2013-7353). Added overflow detection in png_set_sPLT() and
4386 png_set_text_2() (CVE-2013-7354).
4387
4388 Version 1.6.0beta40 [January 20, 2013]
4389 Use consistent handling of overflows in text, sPLT and unknown png_set_* APIs
4390
4391 Version 1.6.0rc01 [January 26, 2013]
4392 No changes.
4393
4394 Version 1.6.0rc02 [February 4, 2013]
4395 Added png_get_palette_max() function.
4396
4397 Version 1.6.0rc03 [February 5, 2013]
4398 Fixed the png_get_palette_max API.
4399
4400 Version 1.6.0rc04 [February 7, 2013]
4401 Turn serial tests back on (recently turned off by autotools upgrade).
4402
4403 Version 1.6.0rc05 [February 8, 2013]
4404 Update manual about png_get_palette_max().
4405
4406 Version 1.6.0rc06 [February 9, 2013]
4407 Fixed missing dependency in --prefix builds The intermediate
4408 internal 'prefix.h' file can only be generated correctly after
4409 pnglibconf.h, however the dependency was not in Makefile.am. The
4410 symptoms are unpredictable depending on the order make chooses to
4411 build pngprefix.h and pnglibconf.h, often the error goes unnoticed
4412 because there is a system pnglibconf.h to use instead.
4413
4414 Version 1.6.0rc07 [February 10, 2013]
4415 Enclosed the new png_get_palette_max in #ifdef PNG_GET_PALETTE_MAX_SUPPORTED
4416 block, and revised pnglibconf.h and pnglibconf.h.prebuilt accordingly.
4417
4418 Version 1.6.0rc08 [February 10, 2013]
4419 Fix typo in png.h #ifdef
4420
4421 Version 1.6.0 [February 14, 2013]
4422 No changes.
4423
4424 Version 1.6.1beta01 [February 16, 2013]
4425 Made symbol prefixing work with the ARM neon optimizations. Also allow
4426 pngpriv.h to be included for preprocessor definitions only, so it can
4427 be used in non-C/C++ files. Back ported from libpng 1.7.
4428 Made sRGB check numbers consistent.
4429 Ported libpng 1.5 options.awk/dfn file handling to 1.6, fixed one bug.
4430 Removed cc -E workround, corrected png_get_palette_max API Tested on
4431 SUN OS cc 5.9, which demonstrates the tokenization problem previously
4432 avoided by using /lib/cpp. Since all .dfn output is now protected in
4433 double quotes unless it is to be macro substituted the fix should
4434 work everywhere.
4435 Enabled parallel tests - back ported from libpng-1.7.
4436 scripts/pnglibconf.dfa formatting improvements back ported from libpng17.
4437 Fixed a race condition in the creation of the build 'scripts' directory
4438 while building with a parallel make.
4439 Use approved/supported Android method to check for NEON, use Linux/POSIX
4440 1003.1 API to check /proc/self/auxv avoiding buffer allocation and other
4441 library calls (ported from libpng15).
4442
4443 Version 1.6.1beta02 [February 19, 2013]
4444 Use parentheses more consistently in "#if defined(MACRO)" tests.
4445 Folded long lines.
4446 Reenabled code to allow zero length PLTE chunks for MNG.
4447
4448 Version 1.6.1beta03 [February 22, 2013]
4449 Fixed ALIGNED_MEMORY support.
4450 Added a new configure option:
4451 --enable-arm-neon=always will stop the run-time checks. New checks
4452 within arm/arm_init.c will cause the code not to be compiled unless
4453 __ARM_NEON__ is set. This should make it fail safe (if someone asks
4454 for it on then the build will fail if it can't be done.)
4455 Updated the INSTALL document.
4456
4457 Version 1.6.1beta04 [February 27, 2013]
4458 Revised INSTALL to recommend using CPPFLAGS instead of INCLUDES.
4459 Revised scripts/makefile.freebsd to respect ZLIBLIB and ZLIBINC.
4460 Revised scripts/dfn.awk to work with the buggy MSYS awk that has trouble
4461 with CRLF line endings.
4462
4463 Version 1.6.1beta05 [March 1, 2013]
4464 Avoid a possible memory leak in contrib/gregbook/readpng.c
4465
4466 Version 1.6.1beta06 [March 4, 2013]
4467 Better documentation of unknown handling API interactions.
4468 Corrected Android builds and corrected libpng.vers with symbol
4469 prefixing. It also makes those tests compile and link on Android.
4470 Added an API png_set_option() to set optimization options externally,
4471 providing an alternative and general solution for the non-portable
4472 run-time tests used by the ARM Neon code, using the PNG_ARM_NEON option.
4473 The order of settings vs options in pnglibconf.h is reversed to allow
4474 settings to depend on options and options can now set (or override) the
4475 defaults for settings.
4476
4477 Version 1.6.1beta07 [March 7, 2013]
4478 Corrected simplified API default gamma for color-mapped output, added
4479 a flag to change default. In 1.6.0 when the simplified API was used
4480 to produce color-mapped output from an input image with no gamma
4481 information the gamma assumed for the input could be different from
4482 that assumed for non-color-mapped output. In particular 16-bit depth
4483 input files were assumed to be sRGB encoded, whereas in the 'direct'
4484 case they were assumed to have linear data. This was an error. The
4485 fix makes the simplified API treat all input files the same way and
4486 adds a new flag to the png_image::flags member to allow the
4487 application/user to specify that 16-bit files contain sRGB data
4488 rather than the default linear.
4489 Fixed bugs in the pngpixel and makepng test programs.
4490
4491 Version 1.6.1beta08 [March 7, 2013]
4492 Fixed CMakelists.txt to allow building a single variant of the library
4493 (Claudio Bley):
4494 Introduced a PNG_LIB_TARGETS variable that lists all activated library
4495 targets. It is an error if this variable ends up empty, ie. you have
4496 to build at least one library variant.
4497 Made the *_COPY targets only depend on library targets actually being build.
4498 Use PNG_LIB_TARGETS to unify a code path.
4499 Changed the CREATE_SYMLINK macro to expect the full path to a file as the
4500 first argument. When symlinking the filename component of that path is
4501 determined and used as the link target.
4502 Use copy_if_different in the CREATE_SYMLINK macro.
4503
4504 Version 1.6.1beta09 [March 13, 2013]
4505 Eliminated two warnings from the Intel C compiler. The warnings are
4506 technically valid, although a reasonable treatment of division would
4507 show it to be incorrect.
4508
4509 Version 1.6.1rc01 [March 21, 2013]
4510 No changes.
4511
4512 Version 1.6.1 [March 28, 2013]
4513 No changes.
4514
4515 Version 1.6.2beta01 [April 14, 2013]
4516 Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling.
4517 Fixed incorrect warning of excess deflate data. End condition - the
4518 warning would be produced if the end of the deflate stream wasn't read
4519 in the last row. The warning is harmless.
4520 Corrected the test on user transform changes on read. It was in the
4521 png_set of the transform function, but that doesn't matter unless the
4522 transform function changes the rowbuf size, and that is only valid if
4523 transform_info is called.
4524 Corrected a misplaced closing bracket in contrib/libtests/pngvalid.c
4525 (Flavio Medeiros).
4526 Corrected length written to uncompressed iTXt chunks (Samuli Suominen).
4527 Bug was introduced in libpng-1.6.0.
4528
4529 Version 1.6.2rc01 [April 18, 2013]
4530 Added contrib/tools/fixitxt.c, to repair the erroneous iTXt chunk length
4531 written by libpng-1.6.0 and 1.6.1.
4532 Disallow storing sRGB information when the sRGB is not supported.
4533
4534 Version 1.6.2rc02 [April 18, 2013]
4535 Merge pngtest.c with libpng-1.7.0
4536
4537 Version 1.6.2rc03 [April 22, 2013]
4538 Trivial spelling cleanup.
4539
4540 Version 1.6.2rc04 and 1.6.2rc05 [omitted]
4541
4542 Version 1.6.2rc06 [April 24, 2013]
4543 Reverted to version 1.6.2rc03. Recent changes to arm/neon support
4544 have been ported to libpng-1.7.0beta09 and will reappear in version
4545 1.6.3beta01.
4546
4547 Version 1.6.2 [April 25, 2013]
4548 No changes.
4549
4550 Version 1.6.3beta01 [April 25, 2013]
4551 Revised stack marking in arm/filter_neon.S and configure.ac.
4552 Ensure that NEON filter stuff is completely disabled when switched 'off'.
4553 Previously the ARM NEON specific files were still built if the option
4554 was switched 'off' as opposed to being explicitly disabled.
4555
4556 Version 1.6.3beta02 [April 26, 2013]
4557 Test for 'arm*' not just 'arm' in the host_cpu configure variable.
4558 Rebuilt the configure scripts.
4559
4560 Version 1.6.3beta03 [April 30, 2013]
4561 Expanded manual paragraph about writing private chunks, particularly
4562 the need to call png_set_keep_unknown_chunks() when writing them.
4563 Avoid dereferencing NULL pointer possibly returned from
4564 png_create_write_struct() (Andrew Church).
4565
4566 Version 1.6.3beta05 [May 9, 2013]
4567 Calculate our own zlib windowBits when decoding rather than trusting the
4568 CMF bytes in the PNG datastream.
4569 Added an option to force maximum window size for inflating, which was
4570 the behavior of libpng15 and earlier, via a new PNG_MAXIMUM_INFLATE_WINDOW
4571 option for png_set_options().
4572 Added png-fix-itxt and png-fix-too-far-back to the built programs and
4573 removed warnings from the source code and timepng that are revealed as
4574 a result.
4575 Detect wrong libpng versions linked to png-fix-too-far-back, which currently
4576 only works with libpng versions that can be made to reliably fail when
4577 the deflate data contains an out-of-window reference. This means only
4578 1.6 and later.
4579 Fixed gnu issues: g++ needs a static_cast, gcc 4.4.7 has a broken warning
4580 message which it is easier to work round than ignore.
4581 Updated contrib/pngminus/pnm2png.c (Paul Stewart):
4582 Check for EOF
4583 Ignore "#" delimited comments in input file to pnm2png.c.
4584 Fixed whitespace handling
4585 Added a call to png_set_packing()
4586 Initialize dimension values so if sscanf fails at least we have known
4587 invalid values.
4588 Attempt to detect configuration issues with png-fix-too-far-back, which
4589 requires both the correct libpng and the correct zlib to function
4590 correctly.
4591 Check ZLIB_VERNUM for mismatches, enclose #error in quotes
4592 Added information in the documentation about problems with and fixes for
4593 the bad CRC and bad iTXt chunk situations.
4594
4595 Version 1.6.3beta06 [May 12, 2013]
4596 Allow contrib/pngminus/pnm2png.c to compile without WRITE_INVERT and
4597 WRITE_PACK supported (writes error message that it can't read P1 or
4598 P4 PBM files).
4599 Improved png-fix-too-far-back usage message, added --suffix option.
4600 Revised contrib/pngminim/*/makefile to generate pnglibconf.h with the
4601 right zlib header files.
4602 Separated CPPFLAGS and CFLAGS in contrib/pngminim/*/makefile
4603
4604 Version 1.6.3beta07 [June 8, 2013]
4605 Removed a redundant test in png_set_IHDR().
4606 Added set(CMAKE_CONFIGURATION_TYPES ...) to CMakeLists.txt (Andrew Hundt)
4607 Deleted set(CMAKE_BUILD_TYPE) block from CMakeLists.txt
4608 Enclose the prototypes for the simplified write API in
4609 #ifdef PNG_STDIO_SUPPORTED/#endif
4610 Make ARM NEON support work at compile time (not just configure time).
4611 This moves the test on __ARM_NEON__ into pngconf.h to avoid issues when
4612 using a compiler that compiles for multiple architectures at one time.
4613 Removed PNG_FILTER_OPTIMIZATIONS and PNG_ARM_NEON_SUPPORTED from
4614 pnglibconf.h, allowing more of the decisions to be made internally
4615 (pngpriv.h) during the compile. Without this, symbol prefixing is broken
4616 under certain circumstances on ARM platforms. Now only the API parts of
4617 the optimizations ('check' vs 'api') are exposed in the public header files
4618 except that the new setting PNG_ARM_NEON_OPT documents how libpng makes the
4619 decision about whether or not to use the optimizations.
4620 Protect symbol prefixing against CC/CPPFLAGS/CFLAGS useage.
4621 Previous iOS/Xcode fixes for the ARM NEON optimizations moved the test
4622 on __ARM_NEON__ from configure time to compile time. This breaks symbol
4623 prefixing because the definition of the special png_init_filter_functions
4624 call was hidden at configure time if the relevant compiler arguments are
4625 passed in CFLAGS as opposed to CC. This change attempts to avoid all
4626 the confusion that would result by declaring the init function even when
4627 it is not used, so that it will always get prefixed.
4628
4629 Version 1.6.3beta08 [June 18, 2013]
4630 Revised libpng.3 so that "doclifter" can process it.
4631
4632 Version 1.6.3beta09 [June 27, 2013]
4633 Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18
4634 as parameters for png_set_gamma(). These have been available since
4635 libpng-1.5.4.
4636 Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised it
4637 to check all compressed chunks known to libpng.
4638
4639 Version 1.6.3beta10 [July 5, 2013]
4640 Updated documentation to show default behavior of benign errors correctly.
4641 Only compile ARM code when PNG_READ_SUPPORTED is defined.
4642 Fixed undefined behavior in contrib/tools/pngfix.c and added new strip
4643 option. pngfix relied on undefined behavior and even a simple change from
4644 gcc to g++ caused it to fail. The new strip option 'unsafe' has been
4645 implemented and is the default if --max is given. Option names have
4646 been clarified, with --strip=transform now stripping the bKGD chunk,
4647 which was stripped previously with --strip=unused.
4648 Added all documented chunk types to pngpriv.h
4649 Unified pngfix.c source with libpng17.
4650
4651 Version 1.6.3rc01 [July 11, 2013]
4652 No changes.
4653
4654 Version 1.6.3 [July 18, 2013]
4655 Revised manual about changes in iTXt chunk handling made in libpng-1.6.0.
4656 Added "/* SAFE */" comments in pngrutil.c and pngrtran.c where warnings
4657 may be erroneously issued by code-checking applications.
4658
4659 Version 1.6.4beta01 [August 21, 2013]
4660 Added information about png_set_options() to the manual.
4661 Delay calling png_init_filter_functions() until a row with nonzero filter
4662 is found.
4663
4664 Version 1.6.4beta02 [August 30, 2013]
4665 Fixed inconsistent conditional compilation of png_chunk_unknown_handling()
4666 prototype, definition, and usage. Made it depend on
4667 PNG_HANDLE_AS_UNKNOWN_SUPPORTED everywhere.
4668
4669 Version 1.6.4rc01 [September 5, 2013]
4670 No changes.
4671
4672 Version 1.6.4 [September 12, 2013]
4673 No changes.
4674
4675 Version 1.6.5 [September 14, 2013]
4676 Removed two stray lines of code from arm/arm_init.c.
4677
4678 Version 1.6.6 [September 16, 2013]
4679 Removed two stray lines of code from arm/arm_init.c, again.
4680
4681 Version 1.6.7beta01 [September 30, 2013]
4682 Revised unknown chunk code to correct several bugs in the NO_SAVE_/NO_WRITE
4683 combination
4684 Allow HANDLE_AS_UNKNOWN to work when other options are configured off. Also
4685 fixed the pngminim makefiles to work when $(MAKEFLAGS) contains stuff
4686 which terminates the make options (as by default in recent versions of
4687 Gentoo).
4688 Avoid up-cast warnings in pngvalid.c. On ARM the alignment requirements of
4689 png_modifier are greater than that of png_store and as a consequence
4690 compilation of pngvalid.c results in a warning about increased alignment
4691 requirements because of the bare cast to (png_modifier*). The code is safe,
4692 because the pointer is known to point to a stack allocated png_modifier,
4693 but this change avoids the warning.
4694 Fixed default behavior of ARM_NEON_API. If the ARM NEON API option was
4695 compiled without the CHECK option it defaulted to on, not off.
4696 Check user callback behavior in pngunknown.c. Previous versions compiled
4697 if SAVE_UNKNOWN was not available but did nothing since the callback
4698 was never implemented.
4699 Merged pngunknown.c with 1.7 version and back ported 1.7 improvements/fixes
4700
4701 Version 1.6.7beta02 [October 12, 2013]
4702 Made changes for compatibility with automake 1.14:
4703 1) Added the 'compile' program to the list of programs that must be cleaned
4704 in autogen.sh
4705 2) Added 'subdir-objects' which causes .c files in sub-directories to be
4706 compiled such that the corresponding .o files are also in the
4707 sub-directory. This is because automake 1.14 warns that the
4708 current behavior of compiling to the top level directory may be removed
4709 in the future.
4710 3) Updated dependencies on pnglibconf.h to match the new .o locations and
4711 added all the files in contrib/libtests and contrib/tools that depend
4712 on pnglibconf.h
4713 4) Added 'BUILD_SOURCES = pnglibconf.h'; this is the automake recommended
4714 way of handling the dependencies of sources that are machine generated;
4715 unfortunately it only works if the user does 'make all' or 'make check',
4716 so the dependencies (3) are still required.
4717 Cleaned up (char*) casts of zlib messages. The latest version of the Intel C
4718 compiler complains about casting a string literal as (char*), so copied the
4719 treatment of z_const from the library code into pngfix.c
4720 Simplified error message code in pngunknown. The simplification has the
4721 useful side effect of avoiding a bogus warning generated by the latest
4722 version of the Intel C compiler (it objects to
4723 condition ? string-literal : string-literal).
4724 Make autogen.sh work with automake 1.13 as well as 1.14. Do this by always
4725 removing the 1.14 'compile' script but never checking for it.
4726
4727 Version 1.6.7beta03 [October 19, 2013]
4728 Added ARMv8 support (James Yu <james.yu at linaro.org>). Added file
4729 arm/filter_neon_intrinsics.c; enable with -mfpu=neon.
4730 Revised pngvalid to generate size images with as many filters as it can
4731 manage, limited by the number of rows.
4732 Cleaned up ARM NEON compilation handling. The tests are now in pngpriv.h
4733 and detect the broken GCC compilers.
4734
4735 Version 1.6.7beta04 [October 26, 2013]
4736 Allow clang derived from older GCC versions to use ARM intrinsics. This
4737 causes all clang builds that use -mfpu=neon to use the intrinsics code,
4738 not the assembler code. This has only been tested on iOS 7. It may be
4739 necessary to exclude some earlier clang versions but this seems unlikely.
4740 Changed NEON implementation selection mechanism. This allows assembler
4741 or intrinsics to be turned on at compile time during the build by defining
4742 PNG_ARM_NEON_IMPLEMENTATION to the correct value (2 or 1). This macro
4743 is undefined by default and the build type is selected in pngpriv.h.
4744
4745 Version 1.6.7rc01 [November 2, 2013]
4746 No changes.
4747
4748 Version 1.6.7rc02 [November 7, 2013]
4749 Fixed #include in filter_neon_intrinsics.c and ctype macros. The ctype char
4750 checking macros take an unsigned char argument, not a signed char.
4751
4752 Version 1.6.7 [November 14, 2013]
4753 No changes.
4754
4755 Version 1.6.8beta01 [November 24, 2013]
4756 Moved prototype for png_handle_unknown() in pngpriv.h outside of
4757 the #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED/#endif block.
4758 Added "-Wall" to CFLAGS in contrib/pngminim/*/makefile
4759 Conditionally compile some unused functions reported by -Wall in
4760 pngminim.
4761 Fixed 'minimal' builds. Various obviously useful minimal configurations
4762 don't build because of missing contrib/libtests test programs and
4763 overly complex dependencies in scripts/pnglibconf.dfa. This change
4764 adds contrib/conftest/*.dfa files that can be used in automatic build
4765 scripts to ensure that these configurations continue to build.
4766 Enabled WRITE_INVERT and WRITE_PACK in contrib/pngminim/encoder.
4767 Fixed pngvalid 'fail' function declaration on the Intel C Compiler.
4768 This reverts to the previous 'static' implementation and works round
4769 the 'unused static function' warning by using PNG_UNUSED().
4770
4771 Version 1.6.8beta02 [November 30, 2013]
4772 Removed or marked PNG_UNUSED some harmless "dead assignments" reported
4773 by clang scan-build.
4774 Changed tabs to 3 spaces in png_debug macros and changed '"%s"m'
4775 to '"%s" m' to improve portability among compilers.
4776 Changed png_free_default() to free() in pngtest.c
4777
4778 Version 1.6.8rc01 [December 12, 2013]
4779 Tidied up pngfix inits and fixed pngtest no-write builds.
4780
4781 Version 1.6.8rc02 [December 14, 2013]
4782 Handle zero-length PLTE chunk or NULL palette with png_error()
4783 instead of png_chunk_report(), which by default issues a warning
4784 rather than an error, leading to later reading from a NULL pointer
4785 (png_ptr->palette) in png_do_expand_palette(). This is CVE-2013-6954
4786 and VU#650142. Libpng-1.6.1 through 1.6.7 are vulnerable.
4787 Libpng-1.6.0 and earlier do not have this bug.
4788
4789 Version 1.6.8 [December 19, 2013]
4790 No changes.
4791
4792 Version 1.6.9beta01 [December 26, 2013]
4793 Bookkeeping: Moved functions around (no changes). Moved transform
4794 function definitions before the place where they are called so that
4795 they can be made static. Move the intrapixel functions and the
4796 grayscale palette builder out of the png?tran.c files. The latter
4797 isn't a transform function and is no longer used internally, and the
4798 former MNG specific functions are better placed in pngread/pngwrite.c
4799 Made transform implementation functions static. This makes the internal
4800 functions called by png_do_{read|write}_transformations static. On an
4801 x86-64 DLL build (Gentoo Linux) this reduces the size of the text
4802 segment of the DLL by 1208 bytes, about 0.6%. It also simplifies
4803 maintenance by removing the declarations from pngpriv.h and allowing
4804 easier changes to the internal interfaces.
4805 Rebuilt configure scripts with automake-1.14.1 and autoconf-2.69
4806 in the tar distributions.
4807
4808 Version 1.6.9beta02 [January 1, 2014]
4809 Added checks for libpng 1.5 to pngvalid.c. This supports the use of
4810 this version of pngvalid in libpng 1.5
4811 Merged with pngvalid.c from libpng-1.7 changes to create a single
4812 pngvalid.c
4813 Removed #error macro from contrib/tools/pngfix.c (Thomas Klausner).
4814 Merged pngrio.c, pngtrans.c, pngwio.c, and pngerror.c with libpng-1.7.0
4815 Merged libpng-1.7.0 changes to make no-interlace configurations work
4816 with test programs.
4817 Revised pngvalid.c to support libpng 1.5, which does not support the
4818 PNG_MAXIMUM_INFLATE_WINDOW option, so #define it out when appropriate in
4819 pngvalid.c
4820 Allow unversioned links created on install to be disabled in configure.
4821 In configure builds 'make install' changes/adds links like png.h
4822 and libpng.a to point to the newly installed, versioned, files (e.g.
4823 libpng17/png.h and libpng17.a). Three new configure options and some
4824 rearrangement of Makefile.am allow creation of these links to be disabled.
4825
4826 Version 1.6.9beta03 [January 10, 2014]
4827 Removed potentially misleading warning from png_check_IHDR().
4828
4829 Version 1.6.9beta04 [January 20, 2014]
4830 Updated scripts/makefile.* to use CPPFLAGS (Cosmin).
4831 Added clang attribute support (Cosmin).
4832
4833 Version 1.6.9rc01 [January 28, 2014]
4834 No changes.
4835
4836 Version 1.6.9rc02 [January 30, 2014]
4837 Quiet an uninitialized memory warning from VC2013 in png_get_png().
4838
4839 Version 1.6.9 [February 6, 2014]
4840
4841 Version 1.6.10beta01 [February 9, 2014]
4842 Backported changes from libpng-1.7.0beta30 and beta31:
4843 Fixed a large number of instances where PNGCBAPI was omitted from
4844 function definitions.
4845 Added pngimage test program for png_read_png() and png_write_png()
4846 with two new test scripts.
4847 Removed dependence on !PNG_READ_EXPAND_SUPPORTED for calling
4848 png_set_packing() in png_read_png().
4849 Fixed combination of ~alpha with shift. On read invert alpha, processing
4850 occurred after shift processing, which causes the final values to be
4851 outside the range that should be produced by the shift. Reversing the
4852 order on read makes the two transforms work together correctly and mirrors
4853 the order used on write.
4854 Do not read invalid sBIT chunks. Previously libpng only checked sBIT
4855 values on write, so a malicious PNG writer could therefore cause
4856 the read code to return an invalid sBIT chunk, which might lead to
4857 application errors or crashes. Such chunks are now skipped (with
4858 chunk_benign_error).
4859 Make png_read_png() and png_write_png() prototypes in png.h depend
4860 upon PNG_READ_SUPPORTED and PNG_WRITE_SUPPORTED.
4861 Support builds with unsupported PNG_TRANSFORM_* values. All of the
4862 PNG_TRANSFORM_* values are always defined in png.h and, because they
4863 are used for both read and write in some cases, it is not reliable
4864 to #if out ones that are totally unsupported. This change adds error
4865 detection in png_read_image() and png_write_image() to do a
4866 png_app_error() if the app requests something that cannot be done
4867 and it adds corresponding code to pngimage.c to handle such options
4868 by not attempting to test them.
4869
4870 Version 1.6.10beta02 [February 23, 2014]
4871 Moved redefines of png_error(), png_warning(), png_chunk_error(),
4872 and png_chunk_warning() from pngpriv.h to png.h to make them visible
4873 to libpng-calling applications.
4874 Moved OS dependent code from arm/arm_init.c, to allow the included
4875 implementation of the ARM NEON discovery function to be set at
4876 build-time and provide sample implementations from the current code in the
4877 contrib/arm-neon subdirectory. The __linux__ code has also been changed to
4878 compile and link on Android by using /proc/cpuinfo, and the old linux code
4879 is in contrib/arm-neon/linux-auxv.c. The new code avoids POSIX and Linux
4880 dependencies apart from opening /proc/cpuinfo and is C90 compliant.
4881 Check for info_ptr == NULL early in png_read_end() so we don't need to
4882 run all the png_handle_*() and depend on them to return if info_ptr == NULL.
4883 This improves the performance of png_read_end(png_ptr, NULL) and makes
4884 it more robust against future programming errors.
4885 Check for __has_extension before using it in pngconf.h, to
4886 support older Clang versions (Jeremy Sequoia).
4887 Treat CRC error handling with png_set_crc_action(), instead of with
4888 png_set_benign_errors(), which has been the case since libpng-1.6.0beta18.
4889 Use a user warning handler in contrib/gregbook/readpng2.c instead of default,
4890 so warnings will be put on stderr even if libpng has CONSOLE_IO disabled.
4891 Added png_ptr->process_mode = PNG_READ_IDAT_MODE in png_push_read_chunk
4892 after recognizing the IDAT chunk, which avoids an infinite loop while
4893 reading a datastream whose first IDAT chunk is of zero-length.
4894 This fixes CERT VU#684412 and CVE-2014-0333.
4895 Don't recognize known sRGB profiles as sRGB if they have been hacked,
4896 but don't reject them and don't issue a copyright violation warning.
4897
4898 Version 1.6.10beta03 [February 25, 2014]
4899 Moved some documentation from png.h to libpng.3 and libpng-manual.txt
4900 Minor editing of contrib/arm-neon/README and contrib/examples/*.c
4901
4902 Version 1.6.10rc01 [February 27, 2014]
4903 Fixed typos in the manual and in scripts/pnglibconf.dfa (CFLAGS -> CPPFLAGS
4904 and PNG_USR_CONFIG -> PNG_USER_CONFIG).
4905
4906 Version 1.6.10rc02 [February 28, 2014]
4907 Removed unreachable return statement after png_chunk_error()
4908 in pngrutil.c
4909
4910 Version 1.6.10rc03 [March 4, 2014]
4911 Un-deprecated png_data_freer().
4912
4913 Version 1.6.10 [March 6, 2014]
4914 No changes.
4915
4916 Version 1.6.11beta01 [March 17, 2014]
4917 Use "if (value != 0)" instead of "if (value)" consistently.
4918 Changed ZlibSrcDir from 1.2.5 to 1.2.8 in projects/vstudio.
4919 Moved configuration information from the manual to the INSTALL file.
4920
4921 Version 1.6.11beta02 [April 6, 2014]
4922 Removed #if/#else/#endif from inside two pow() calls in pngvalid.c because
4923 they were handled improperly by Portland Group's PGI-14.1 - PGI-14.3
4924 when using its "__builtin_pow()" function.
4925 Silence 'unused parameter' build warnings (Cosmin Truta).
4926 $(CP) is now used alongside $(RM_F). Also, use 'copy' instead of 'cp'
4927 where applicable, and applied other minor makefile changes (Cosmin).
4928 Don't warn about invalid dimensions exceeding user limits (Cosmin).
4929 Allow an easy replacement of the default pre-built configuration
4930 header with a custom header, via the make PNGLIBCONF_H_PREBUILT
4931 macro (Cosmin).
4932
4933 Version 1.6.11beta03 [April 6, 2014]
4934 Fixed a typo in pngrutil.c, introduced in libpng-1.5.6, that interferes
4935 with "blocky" expansion of sub-8-bit interlaced PNG files (Eric Huss).
4936 Optionally use __builtin_bswap16() in png_do_swap().
4937
4938 Version 1.6.11beta04 [April 19, 2014]
4939 Made progressive reading of interlaced images consistent with the
4940 behavior of the sequential reader and consistent with the manual, by
4941 moving some code out of the PNG_READ_INTERLACING_SUPPORTED blocks. The
4942 row_callback now receives the proper pass number and unexpanded rows, when
4943 png_combine_row() isn't built or used, and png_set_interlace_handling()
4944 is not called.
4945 Allow PNG_sRGB_PROFILE_CHECKING = (-1) to mean no sRGB profile checking.
4946
4947 Version 1.6.11beta05 [April 26, 2014]
4948 Do not reject ICC V2 profiles that lack padding (Kai-Uwe Behrmann).
4949 Relocated closing bracket of the sRGB profile test loop to avoid getting
4950 "Not recognizing known sRGB profile that has been edited" warning for
4951 ICC V2 profiles that lack the MD5 signature in the profile header.
4952
4953 Version 1.6.11beta06 [May 19, 2014]
4954 Added PNG_SKIP_sRGB_CHECK_PROFILE choice for png_set_option().
4955
4956 Version 1.6.11rc01 [May 27, 2014]
4957 No changes.
4958
4959 Version 1.6.11rc02 [June 3, 2014]
4960 Test ZLIB_VERNUM instead of PNG_ZLIB_VERNUM in contrib/tools/pngfix.c
4961
4962 Version 1.6.11 [June 5, 2014]
4963 No changes.
4964
4965 Version 1.6.12rc01 [June 6, 2014]
4966 Relocated new code from 1.6.11beta06 in png.c to a point after the
4967 declarations (Max Stepin).
4968
4969 Version 1.6.12rc02 [June 7, 2014]
4970 Changed file permissions of contrib/tools/intgamma.sh,
4971 test-driver, and compile from 0644 to 0755 (Cosmin).
4972
4973 Version 1.6.12rc03 [June 8, 2014]
4974 Ensure "__has_attribute()" macro exists before trying to use it with
4975 old clang compilers (MacPorts Ticket #43939).
4976
4977 Version 1.6.12 [June 12, 2014]
4978 No changes.
4979
4980 Version 1.6.13beta01 [July 4, 2014]
4981 Quieted -Wsign-compare and -Wclobber compiler warnings in
4982 contrib/pngminus/*.c
4983 Added "(void) png_ptr;" where needed in contrib/gregbook to quiet
4984 compiler complaints about unused pointers.
4985 Split a long output string in contrib/gregbook/rpng2-x.c.
4986 Added "PNG_SET_OPTION" requirement for sRGB chunk support to pnglibconf.dfa,
4987 Needed for write-only support (John Bowler).
4988 Changed "if defined(__ARM_NEON__)" to
4989 "if (defined(__ARM_NEON__) || defined(__ARM_NEON))" (James Wu).
4990 Fixed clang no-warning builds: png_digit was defined but never used.
4991
4992 Version 1.6.13beta02 [July 21, 2014]
4993 Fixed an incorrect separator ("/" should be "\") in scripts/makefile.vcwin32
4994 (bug report from Wolfgang S. Kechel). Bug was introduced in libpng-1.6.11.
4995 Also fixed makefile.bc32, makefile.bor, makefile.msc, makefile.intel, and
4996 makefile.tc3 similarly.
4997
4998 Version 1.6.13beta03 [August 3, 2014]
4999 Removed scripts/makefile.elf. It has not worked since libpng-1.5.0beta14
5000 due to elimination of the PNG_FUNCTION_EXPORT and PNG_DATA_EXPORT
5001 definitions from pngconf.h.
5002 Ensure that CMakeLists.txt makes the target "lib" directory before making
5003 symbolic link into it (SourceForge bug report #226 by Rolf Timmermans).
5004
5005 Version 1.6.13beta04 [August 8, 2014]
5006 Added opinion that the ECCN (Export Control Classification Number) for
5007 libpng is EAR99 to the README file.
5008 Eliminated use of "$<" in makefile explicit rules, when copying
5009 $PNGLIBCONF_H_PREBUILT. This does not work on some versions of make;
5010 bug introduced in libpng version 1.6.11.
5011
5012 Version 1.6.13rc01 [August 14, 2014]
5013 Made "ccopts" agree with "CFLAGS" in scripts/makefile.hp* and makefile.*sunu
5014
5015 Version 1.6.13 [August 21, 2014]
5016 No changes.
5017
5018 Version 1.6.14beta01 [September 14, 2014]
5019 Guard usage of png_ptr->options with #ifdef PNG_SET_OPTION_SUPPORTED.
5020 Do not build contrib/tools/pngfix.c when PNG_SETJMP_NOT_SUPPORTED,
5021 to allow "make" to complete without setjmp support (bug report by
5022 Claudio Fontana)
5023 Add "#include <setjmp.h>" to contrib/tools/pngfix.c (John Bowler)
5024
5025 Version 1.6.14beta02 [September 18, 2014]
5026 Use nanosleep() instead of usleep() in contrib/gregbook/rpng2-x.c
5027 because usleep() is deprecated.
5028 Define usleep() in contrib/gregbook/rpng2-x.c if not already defined
5029 in unistd.h and nanosleep() is not available; fixes error introduced
5030 in libpng-1.6.13.
5031 Disable floating point exception handling in pngvalid.c when
5032 PNG_FLOATING_ARITHMETIC is not supported (bug report by "zootus
5033 at users.sourceforge.net").
5034
5035 Version 1.6.14beta03 [September 19, 2014]
5036 Define FE_DIVBYZERO, FE_INVALID, and FE_OVERFLOW in pngvalid.c if not
5037 already defined. Revert floating point exception handling in pngvalid.c
5038 to version 1.6.14beta01 behavior.
5039
5040 Version 1.6.14beta04 [September 27, 2014]
5041 Fixed incorrect handling of the iTXt compression flag in pngrutil.c
5042 (bug report by Shunsaku Hirata). Bug was introduced in libpng-1.6.0.
5043
5044 Version 1.6.14beta05 [October 1, 2014]
5045 Added "option READ_iCCP enables READ_COMPRESSED_TEXT" to pnglibconf.dfa
5046
5047 Version 1.6.14beta06 [October 5, 2014]
5048 Removed unused "text_len" parameter from private function png_write_zTXt().
5049 Conditionally compile some code in png_deflate_claim(), when
5050 PNG_WARNINGS_SUPPORTED and PNG_ERROR_TEXT_SUPPORTED are disabled.
5051 Replaced repeated code in pngpread.c with PNG_PUSH_SAVE_BUFFER_IF_FULL.
5052 Added "chunk iTXt enables TEXT" and "chunk zTXt enables TEXT"
5053 to pnglibconf.dfa.
5054 Removed "option READ_COMPRESSED_TEXT enables READ_TEXT" from pnglibconf.dfa,
5055 to make it possible to configure a libpng that supports iCCP but not TEXT.
5056
5057 Version 1.6.14beta07 [October 7, 2014]
5058 Removed "option WRITE_COMPRESSED_TEXT enables WRITE_TEXT" from pnglibconf.dfa
5059 Only mark text chunks as written after successfully writing them.
5060
5061 Version 1.6.14rc01 [October 15, 2014]
5062 Fixed some typos in comments.
5063
5064 Version 1.6.14rc02 [October 17, 2014]
5065 Changed png_convert_to_rfc_1123() to png_convert_to_rfc_1123_buffer()
5066 in the manual, to reflect the change made in libpng-1.6.0.
5067 Updated README file to explain that direct access to the png_struct
5068 and info_struct members has not been permitted since libpng-1.5.0.
5069
5070 Version 1.6.14 [October 23, 2014]
5071 No changes.
5072
5073 Version 1.6.15beta01 [October 29, 2014]
5074 Changed "if (!x)" to "if (x == 0)" and "if (x)" to "if (x != 0)"
5075 Simplified png_free_data().
5076 Added missing "ptr = NULL" after some instances of png_free().
5077
5078 Version 1.6.15beta02 [November 1, 2014]
5079 Changed remaining "if (!x)" to "if (x == 0)" and "if (x)" to "if (x != 0)"
5080
5081 Version 1.6.15beta03 [November 3, 2014]
5082 Added PNG_USE_ARM_NEON configuration flag (Marcin Juszkiewicz).
5083
5084 Version 1.6.15beta04 [November 4, 2014]
5085 Removed new PNG_USE_ARM_NEON configuration flag and made a one-line
5086 revision to configure.ac to support ARM on aarch64 instead (John Bowler).
5087
5088 Version 1.6.15beta05 [November 5, 2014]
5089 Use png_get_libpng_ver(NULL) instead of PNG_LIBPNG_VER_STRING in
5090 example.c, pngtest.c, and applications in the contrib directory.
5091 Avoid out-of-bounds memory access in png_user_version_check().
5092 Simplified and future-proofed png_user_version_check().
5093 Fixed GCC unsigned int->float warnings. Various versions of GCC
5094 seem to generate warnings when an unsigned value is implicitly
5095 converted to double. This is probably a GCC bug but this change
5096 avoids the issue by explicitly converting to (int) where safe.
5097 Free all allocated memory in pngimage. The file buffer cache was left
5098 allocated at the end of the program, harmless but it causes memory
5099 leak reports from clang.
5100 Fixed array size calculations to avoid warnings. At various points
5101 in the code the number of elements in an array is calculated using
5102 sizeof. This generates a compile time constant of type (size_t) which
5103 is then typically assigned to an (unsigned int) or (int). Some versions
5104 of GCC on 64-bit systems warn about the apparent narrowing, even though
5105 the same compiler does apparently generate the correct, in-range,
5106 numeric constant. This adds appropriate, safe, casts to make the
5107 warnings go away.
5108
5109 Version 1.6.15beta06 [November 6, 2014]
5110 Reverted use png_get_libpng_ver(NULL) instead of PNG_LIBPNG_VER_STRING
5111 in the manual, example.c, pngtest.c, and applications in the contrib
5112 directory. It was incorrect advice.
5113
5114 Version 1.6.15beta07 [November 7, 2014]
5115 Removed #ifdef PNG_16BIT_SUPPORTED/#endif around png_product2(); it is
5116 needed by png_reciprocal2().
5117 Added #ifdef PNG_16BIT_SUPPORTED/#endif around png_log16bit() and
5118 png_do_swap().
5119 Changed all "#endif /* PNG_FEATURE_SUPPORTED */" to "#endif /* FEATURE */"
5120
5121 Version 1.6.15beta08 [November 8, 2014]
5122 More housecleaning in *.h
5123
5124 Version 1.6.15rc01 [November 13, 2014]
5125
5126 Version 1.6.15rc02 [November 14, 2014]
5127 The macros passed in the command line to Borland make were ignored if
5128 similarly-named macros were already defined in makefiles. This behavior
5129 is different from POSIX make and other make programs. Surround the
5130 macro definitions with ifndef guards (Cosmin).
5131
5132 Version 1.6.15rc03 [November 16, 2014]
5133 Added "-D_CRT_SECURE_NO_WARNINGS" to CFLAGS in scripts/makefile.vcwin32.
5134 Removed the obsolete $ARCH variable from scripts/makefile.darwin.
5135
5136 Version 1.6.15 [November 20, 2014]
5137 No changes.
5138
5139 Version 1.6.16beta01 [December 14, 2014]
5140 Added ".align 2" to arm/filter_neon.S to support old GAS assemblers that
5141 don't do alignment correctly.
5142 Revised Makefile.am and scripts/symbols.dfn to work with MinGW/MSYS
5143 (Bob Friesenhahn).
5144
5145 Version 1.6.16beta02 [December 15, 2014]
5146 Revised Makefile.am and scripts/*.dfn again to work with MinGW/MSYS;
5147 renamed scripts/*.dfn to scripts/*.c (John Bowler).
5148
5149 Version 1.6.16beta03 [December 21, 2014]
5150 Quiet a "comparison always true" warning in pngstest.c (John Bowler).
5151
5152 Version 1.6.16rc01 [December 21, 2014]
5153 Restored a test on width that was removed from png.c at libpng-1.6.9
5154 (Bug report by Alex Eubanks, CVE-2015-0973).
5155
5156 Version 1.6.16rc02 [December 21, 2014]
5157 Undid the update to pngrutil.c in 1.6.16rc01.
5158
5159 Version 1.6.16rc03 [December 21, 2014]
5160 Fixed an overflow in png_combine_row() with very wide interlaced images
5161 (Bug report and fix by John Bowler, CVE-2014-9495).
5162
5163 Version 1.6.16 [December 22, 2014]
5164 No changes.
5165
5166 Version 1.6.17beta01 [January 29, 2015]
5167 Removed duplicate PNG_SAFE_LIMITS_SUPPORTED handling from pngconf.h
5168 Corrected the width limit calculation in png_check_IHDR().
5169 Removed user limits from pngfix. Also pass NULL pointers to
5170 png_read_row to skip the unnecessary row de-interlace stuff.
5171 Added testing of png_set_packing() to pngvalid.c
5172 Regenerated configure scripts in the *.tar distributions with libtool-2.4.4
5173 Implement previously untested cases of libpng transforms in pngvalid.c
5174 Fixed byte order in png_do_read_filler() with 16-bit input. Previously
5175 the high and low bytes of the filler, from png_set_filler() or from
5176 png_set_add_alpha(), were read in the wrong order.
5177 Made the check for out-of-range values in png_set_tRNS() detect
5178 values that are exactly 2^bit_depth, and work on 16-bit platforms.
5179 Merged some parts of libpng-1.6.17beta01 and libpng-1.7.0beta47.
5180 Added #ifndef __COVERITY__ where needed in png.c, pngrutil.c and
5181 pngset.c to avoid warnings about dead code.
5182 Added "& 0xff" to many instances of expressions that are typecast
5183 to (png_byte), to avoid Coverity warnings.
5184
5185 Version 1.6.17beta02 [February 7, 2015]
5186 Work around one more Coverity-scan dead-code warning.
5187 Do not build png_product2() when it is unused.
5188
5189 Version 1.6.17beta03 [February 17, 2015]
5190 Display user limits in the output from pngtest.
5191 Eliminated the PNG_SAFE_LIMITS macro and restored the 1-million-column
5192 and 1-million-row default limits in pnglibconf.dfa, that can be reset
5193 by the user at build time or run time. This provides a more robust
5194 defense against DOS and as-yet undiscovered overflows.
5195
5196 Version 1.6.17beta04 [February 21, 2015]
5197 Added PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED macro, on by default.
5198 Allow user to call png_get_IHDR() with NULL arguments (Reuben Hawkins).
5199 Rebuilt configure scripts with automake-1.15 and libtool-2.4.6
5200
5201 Version 1.6.17beta05 [February 25, 2015]
5202 Restored compiling of png_reciprocal2 with PNG_NO_16BIT.
5203
5204 Version 1.6.17beta06 [February 27, 2015]
5205 Moved png_set_filter() prototype into a PNG_WRITE_SUPPORTED block
5206 of png.h.
5207 Avoid runtime checks when converting integer to png_byte with
5208 Visual Studio (Sergey Kosarevsky)
5209
5210 Version 1.6.17rc01 [March 4, 2015]
5211 No changes.
5212
5213 Version 1.6.17rc02 [March 9, 2015]
5214 Removed some comments that the configure script did not handle
5215 properly from scripts/pnglibconf.dfa and pnglibconf.h.prebuilt.
5216 Free the unknown_chunks structure even when it contains no data.
5217
5218 Version 1.6.17rc03 [March 12, 2015]
5219 Updated CMakeLists.txt to add OSX framework, change YES/NO to ON/OFF
5220 for consistency, and remove some useless tests (Alexey Petruchik).
5221
5222 Version 1.6.17rc04 [March 16, 2015]
5223 Remove pnglibconf.h, pnglibconf.c, and pnglibconf.out instead of
5224 pnglibconf.* in "make clean" (Cosmin).
5225 Fix bug in calculation of maxbits, in png_write_sBIT, introduced
5226 in libpng-1.6.17beta01 (John Bowler).
5227
5228 Version 1.6.17rc05 [March 21, 2015]
5229 Define PNG_FILTER_* and PNG_FILTER_VALUE_* in png.h even when WRITE
5230 is not supported (John Bowler). This fixes an error introduced in
5231 libpng-1.6.17beta06.
5232 Reverted "& 0xff" additions of version 1.6.17beta01. Libpng passes
5233 the Coverity scan without them.
5234
5235 Version 1.6.17rc06 [March 23, 2015]
5236 Remove pnglibconf.dfn and pnglibconf.pre with "make clean".
5237 Reformatted some "&0xff" instances to "& 0xff".
5238 Fixed simplified 8-bit-linear to sRGB alpha. The calculated alpha
5239 value was wrong. It's not clear if this affected the final stored
5240 value; in the obvious code path the upper and lower 8-bits of the
5241 alpha value were identical and the alpha was truncated to 8-bits
5242 rather than dividing by 257 (John Bowler).
5243
5244 Version 1.6.17 [March 26, 2015]
5245 No changes.
5246
5247 Version 1.6.18beta01 [April 1, 2015]
5248 Removed PNG_SET_CHUNK_[CACHE|MALLOC]_LIMIT_SUPPORTED macros. They
5249 have been combined with PNG_SET_USER_LIMITS_SUPPORTED (resolves
5250 bug report by Andrew Church).
5251 Fixed rgb_to_gray checks and added tRNS checks to pngvalid.c. This
5252 fixes some arithmetic errors that caused some tests to fail on
5253 some 32-bit platforms (Bug reports by Peter Breitenlohner [i686]
5254 and Petr Gajdos [i586]).
5255
5256 Version 1.6.18beta02 [April 26, 2015]
5257 Suppressed some warnings from the Borland C++ 5.5.1/5.82 compiler
5258 (Bug report by Viktor Szakats).
5259
5260 Version 1.6.18beta03 [May 6, 2015]
5261 Replaced "unexpected" with an integer (0xabadca11) in pngset.c
5262 where a long was expected, to avoid a compiler warning when PNG_DEBUG > 1.
5263 Added contrib/examples/simpleover.c, to demonstrate how to handle
5264 alpha compositing of multiple images, using the "simplified API"
5265 and an example PNG generation tool, contrib/examples/genpng.c
5266 (John Bowler).
5267
5268 Version 1.6.18beta04 [May 20, 2015]
5269 PNG_RELEASE_BUILD replaces tests where the code depended on the build base
5270 type and can be defined on the command line, allowing testing in beta
5271 builds (John Bowler).
5272 Avoid Coverity issue 80858 (REVERSE NULL) in pngtest.c PNG_DEBUG builds.
5273 Avoid a harmless potential integer overflow in png_XYZ_from_xy() (Bug
5274 report from Christopher Ferris).
5275
5276 Version 1.6.18beta05 [May 31, 2015]
5277 Backport filter selection code from libpng-1.7.0beta51, to combine
5278 sub_row, up_row, avg_row, and paeth_row into try_row and tst_row.
5279 Changed png_voidcast(), etc., to voidcast(), etc., in contrib/tools/pngfix.c
5280 to avoid confusion with the libpng private macros.
5281 Fixed old cut&paste bug in the weighted filter selection code in
5282 pngwutil.c, introduced in libpng-0.95, March 1997.
5283
5284 Version 1.6.18beta06 [June 1, 2015]
5285 Removed WRITE_WEIGHTED_FILTERED code, to save a few kbytes of the
5286 compiled library size. It never worked properly and as far as we can
5287 tell, no one uses it. The png_set_filter_heuristics() and
5288 png_set_filter_heuristics_fixed() APIs are retained but deprecated
5289 and do nothing.
5290
5291 Version 1.6.18beta07 [June 6, 2015]
5292 Removed non-working progressive reader 'skip' function. This
5293 function has apparently never been used. It was implemented
5294 to support back-door modification of png_struct in libpng-1.4.x
5295 but (because it does nothing and cannot do anything) was apparently
5296 never tested (John Bowler).
5297 Fixed cexcept.h in which GCC 5 now reports that one of the auto
5298 variables in the Try macro needs to be volatile to prevent value
5299 being lost over the setjmp (John Bowler).
5300 Fixed NO_WRITE_FILTER and -Wconversion build breaks (John Bowler).
5301 Fix g++ build breaks (John Bowler).
5302 Quieted some Coverity issues in pngfix.c, png-fix-itxt.c, pngvalid.c,
5303 pngstest.c, and pngimage.c. Most seem harmless, but png-fix-itxt
5304 would only work with iTXt chunks with length 255 or less.
5305 Added #ifdef's to contrib/examples programs so people don't try
5306 to compile them without the minimum required support enabled
5307 (suggested by Flavio Medeiros).
5308
5309 Version 1.6.18beta08 [June 30, 2015]
5310 Eliminated the final two Coverity defects (insecure temporary file
5311 handling in contrib/libtests/pngstest.c; possible overflow of
5312 unsigned char in contrib/tools/png-fix-itxt.c). To use the "secure"
5313 file handling, define PNG_USE_MKSTEMP, otherwise "tmpfile()" will
5314 be used.
5315 Removed some unused WEIGHTED_FILTER macros from png.h and pngstruct.h
5316
5317 Version 1.6.18beta09 [July 5, 2015]
5318 Removed some useless typecasts from contrib/tools/png-fix-itxt.c
5319 Fixed a new signed-unsigned comparison in pngrtran.c (Max Stepin).
5320 Replaced arbitrary use of 'extern' with #define PNG_LINKAGE_*. To
5321 preserve API compatibility, the new defines all default to "extern"
5322 (requested by Jan Nijtmans).
5323
5324 Version 1.6.18rc01 [July 9, 2015]
5325 Belatedly added Mans Rullgard and James Yu to the list of Contributing
5326 Authors.
5327
5328 Version 1.6.18rc02 [July 12, 2015]
5329 Restored unused FILTER_HEURISTIC macros removed at libpng-1.6.18beta08
5330 to png.h to avoid compatibility warnings.
5331
5332 Version 1.6.18rc03 [July 15, 2015]
5333 Minor changes to the man page
5334
5335 Version 1.6.18 [July 23, 2015]
5336 No changes.
5337
5338 Version 1.6.19beta01 [July 30, 2015]
5339 Updated obsolete information about the simplified API macros in the
5340 manual pages (Bug report by Arc Riley).
5341 Avoid potentially dereferencing NULL info_ptr in png_info_init_3().
5342 Rearranged png.h to put the major sections in the same order as
5343 in libpng17.
5344 Eliminated unused PNG_COST_SHIFT, PNG_WEIGHT_SHIFT, PNG_COST_FACTOR, and
5345 PNG_WEIGHT_FACTOR macros.
5346 Suppressed some warnings from the Borland C++ 5.5.1/5.82 compiler
5347 (Bug report by Viktor Szakats). Several warnings remain and are
5348 unavoidable, where we test for overflow.
5349 Fixed potential leak of png_pixels in contrib/pngminus/pnm2png.c
5350 Fixed uninitialized variable in contrib/gregbook/rpng2-x.c
5351
5352 Version 1.6.19beta02 [August 19, 2015]
5353 Moved config.h.in~ from the "libpng_autotools_files" list to the
5354 "libpng_autotools_extra" list in autogen.sh because it was causing a
5355 false positive for missing files (bug report by Robert C. Seacord).
5356 Removed unreachable "break" statements in png.c, pngread.c, and pngrtran.c
5357 to suppress clang warnings (Bug report by Viktor Szakats).
5358 Fixed some bad links in the man page.
5359 Changed "n bit" to "n-bit" in comments.
5360 Added signed/unsigned 16-bit safety net. This removes the dubious
5361 0x8000 flag definitions on 16-bit systems. They aren't supported
5362 yet the defs *probably* work, however it seems much safer to do this
5363 and be advised if anyone, contrary to advice, is building libpng 1.6
5364 on a 16-bit system. It also adds back various switch default clauses
5365 for GCC; GCC errors out if they are not present (with an appropriately
5366 high level of warnings).
5367 Safely convert num_bytes to a png_byte in png_set_sig_bytes() (Robert
5368 Seacord).
5369 Fixed the recently reported 1's complement security issue by replacing
5370 the value that is illegal in the PNG spec, in both signed and unsigned
5371 values, with 0. Illegal unsigned values (anything greater than or equal
5372 to 0x80000000) can still pass through, but since these are not illegal
5373 in ANSI-C (unlike 0x80000000 in the signed case) the checking that
5374 occurs later can catch them (John Bowler).
5375
5376 Version 1.6.19beta03 [September 26, 2015]
5377 Fixed png_save_int_32 when int is not 2's complement (John Bowler).
5378 Updated libpng16 with all the recent test changes from libpng17,
5379 including changes to pngvalid.c to ensure that the original,
5380 distributed, version of contrib/visupng/cexcept.h can be used
5381 (John Bowler).
5382 pngvalid contains the correction to the use of SAVE/STORE_
5383 UNKNOWN_CHUNKS; a bug revealed by changes in libpng 1.7. More
5384 tests contain the --strict option to detect warnings and the
5385 pngvalid-standard test has been corrected so that it does not
5386 turn on progressive-read. There is a separate test which does
5387 that. (John Bowler)
5388 Also made some signed/unsigned fixes.
5389 Make pngstest error limits version specific. Splitting the machine
5390 generated error structs out to a file allows the values to be updated
5391 without changing pngstest.c itself. Since libpng 1.6 and 1.7 have
5392 slightly different error limits this simplifies maintenance. The
5393 makepngs.sh script has also been updated to more accurately reflect
5394 current problems in libpng 1.7 (John Bowler).
5395 Incorporated new test PNG files into make check. tests/pngstest-*
5396 are changed so that the new test files are divided into 8 groups by
5397 gamma and alpha channel. These tests have considerably better code
5398 and pixel-value coverage than contrib/pngsuite; however,coverage is
5399 still incomplete (John Bowler).
5400 Removed the '--strict' in 1.6 because of the double-gamma-correction
5401 warning, updated pngstest-errors.h for the errors detected with the
5402 new contrib/testspngs PNG test files (John Bowler).
5403
5404 Version 1.6.19beta04 [October 15, 2015]
5405 Worked around rgb-to-gray issues in libpng 1.6. The previous
5406 attempts to ignore the errors in the code aren't quite enough to
5407 deal with the 'channel selection' encoding added to libpng 1.7; abort.
5408 pngvalid.c is changed to drop this encoding in prior versions.
5409 Fixed 'pow' macros in pngvalid.c. It is legal for 'pow' to be a
5410 macro, therefore the argument list cannot contain preprocessing
5411 directives. Make sure pow is a function where this happens. This is
5412 a minimal safe fix, the issue only arises in non-performance-critical
5413 code (bug report by Curtis Leach, fix by John Bowler).
5414 Added sPLT support to pngtest.c
5415
5416 Version 1.6.19rc01 [October 23, 2015]
5417 No changes.
5418
5419 Version 1.6.19rc02 [October 31, 2015]
5420 Prevent setting or writing over-length PLTE chunk (Cosmin Truta).
5421 Silently truncate over-length PLTE chunk while reading.
5422 Libpng incorrectly calculated the output rowbytes when the application
5423 decreased either the number of channels or the bit depth (or both) in
5424 a user transform. This was safe; libpng overallocated buffer space
5425 (potentially by quite a lot; up to 4 times the amount required) but,
5426 from 1.5.4 on, resulted in a png_error (John Bowler).
5427
5428 Version 1.6.19rc03 [November 3, 2015]
5429 Fixed some inconsequential cut-and-paste typos in png_set_cHRM_XYZ_fixed().
5430 Clarified COPYRIGHT information to state explicitly that versions
5431 are derived from previous versions.
5432 Removed much of the long list of previous versions from png.h and
5433 libpng.3.
5434
5435 Version 1.6.19rc04 [November 5, 2015]
5436 Fixed new bug with CRC error after reading an over-length palette
5437 (bug report by Cosmin Truta) (CVE-2015-8126).
5438
5439 Version 1.6.19 [November 12, 2015]
5440 Cleaned up coding style in png_handle_PLTE().
5441
5442 Version 1.6.20beta01 [November 20, 2015]
5443 Avoid potential pointer overflow/underflow in png_handle_sPLT() and
5444 png_handle_pCAL() (Bug report by John Regehr).
5445
5446 Version 1.6.20beta02 [November 23, 2015]
5447 Fixed incorrect implementation of png_set_PLTE() that uses png_ptr
5448 not info_ptr, that left png_set_PLTE() open to the CVE-2015-8126
5449 vulnerability.
5450
5451 Version 1.6.20beta03 [November 24, 2015]
5452 Backported tests from libpng-1.7.0beta69.
5453
5454 Version 1.6.20rc01 [November 26, 2015]
5455 Fixed an error in handling of bad zlib CMINFO field in pngfix, found by
5456 American Fuzzy Lop, reported by Brian Carpenter. inflate() doesn't
5457 immediately fault a bad CMINFO field; instead a 'too far back' error
5458 happens later (at least some times). pngfix failed to limit CMINFO to
5459 the allowed values but then assumed that window_bits was in range,
5460 triggering an assert. The bug is mostly harmless; the PNG file cannot
5461 be fixed.
5462
5463 Version 1.6.20rc02 [November 29, 2015]
5464 In libpng 1.6 zlib initialization was changed to use the window size
5465 in the zlib stream, not a fixed value. This causes some invalid images,
5466 where CINFO is too large, to display 'correctly' if the rest of the
5467 data is valid. This provides a workaround for zlib versions where the
5468 error arises (ones that support the API change to use the window size
5469 in the stream).
5470
5471 Version 1.6.20 [December 3, 2015]
5472 No changes.
5473
5474 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
5475 (subscription required; visit
5476 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
5477 to subscribe)
5478 or to glennrp at users.sourceforge.net
5479
5480 Glenn R-P
5481 #endif