rev 52310 : 8213031: (zipfs) Add support for POSIX file permissions

   1 /*
   2  * Copyright (c) 2009, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nio.zipfs;
  27 
  28 /**
  29  *
  30  * @author Xueming Shen
  31  */
  32 
  33 class ZipConstants {
  34     /*
  35      * Compression methods
  36      */
  37     static final int METHOD_STORED     = 0;
  38     static final int METHOD_DEFLATED   = 8;
  39     static final int METHOD_DEFLATED64 = 9;
  40     static final int METHOD_BZIP2      = 12;
  41     static final int METHOD_LZMA       = 14;
  42     static final int METHOD_LZ77       = 19;
  43     static final int METHOD_AES        = 99;
  44 
  45     /*
  46      * General purpose bit flag
  47      */
  48     static final int FLAG_ENCRYPTED  = 0x01;
  49     static final int FLAG_DATADESCR  = 0x08;    // crc, size and csize in dd
  50     static final int FLAG_USE_UTF8   = 0x800;   // If this bit is set the filename and
  51                                                 // comment fields for this file must be
  52                                                 // encoded using UTF-8.
  53     /*
  54      * Header signatures
  55      */
  56     static long LOCSIG = 0x04034b50L;   // "PK\003\004"
  57     static long EXTSIG = 0x08074b50L;   // "PK\007\008"
  58     static long CENSIG = 0x02014b50L;   // "PK\001\002"
  59     static long ENDSIG = 0x06054b50L;   // "PK\005\006"
  60 
  61     /*
  62      * Header sizes in bytes (including signatures)
  63      */
  64     static final int LOCHDR = 30;       // LOC header size
  65     static final int EXTHDR = 16;       // EXT header size
  66     static final int CENHDR = 46;       // CEN header size
  67     static final int ENDHDR = 22;       // END header size
  68 
  69     /*
  70      * Local file (LOC) header field offsets
  71      */
  72     static final int LOCVER = 4;        // version needed to extract
  73     static final int LOCFLG = 6;        // general purpose bit flag
  74     static final int LOCHOW = 8;        // compression method
  75     static final int LOCTIM = 10;       // modification time
  76     static final int LOCCRC = 14;       // uncompressed file crc-32 value
  77     static final int LOCSIZ = 18;       // compressed size
  78     static final int LOCLEN = 22;       // uncompressed size
  79     static final int LOCNAM = 26;       // filename length
  80     static final int LOCEXT = 28;       // extra field length
  81 
  82     /*
  83      * Extra local (EXT) header field offsets
  84      */
  85     static final int EXTCRC = 4;        // uncompressed file crc-32 value
  86     static final int EXTSIZ = 8;        // compressed size
  87     static final int EXTLEN = 12;       // uncompressed size
  88 
  89     /*
  90      * Central directory (CEN) header field offsets
  91      */
  92     static final int CENVEM = 4;        // version made by
  93     static final int CENVER = 6;        // version needed to extract
  94     static final int CENFLG = 8;        // encrypt, decrypt flags
  95     static final int CENHOW = 10;       // compression method
  96     static final int CENTIM = 12;       // modification time
  97     static final int CENCRC = 16;       // uncompressed file crc-32 value
  98     static final int CENSIZ = 20;       // compressed size
  99     static final int CENLEN = 24;       // uncompressed size
 100     static final int CENNAM = 28;       // filename length
 101     static final int CENEXT = 30;       // extra field length
 102     static final int CENCOM = 32;       // comment length
 103     static final int CENDSK = 34;       // disk number start
 104     static final int CENATT = 36;       // internal file attributes
 105     static final int CENATX = 38;       // external file attributes
 106     static final int CENOFF = 42;       // LOC header offset
 107 
 108     /*
 109      * End of central directory (END) header field offsets
 110      */
 111     static final int ENDSUB = 8;        // number of entries on this disk
 112     static final int ENDTOT = 10;       // total number of entries
 113     static final int ENDSIZ = 12;       // central directory size in bytes
 114     static final int ENDOFF = 16;       // offset of first CEN header
 115     static final int ENDCOM = 20;       // zip file comment length
 116 
 117     /*
 118      * ZIP64 constants
 119      */
 120     static final long ZIP64_ENDSIG = 0x06064b50L;  // "PK\006\006"
 121     static final long ZIP64_LOCSIG = 0x07064b50L;  // "PK\006\007"
 122     static final int  ZIP64_ENDHDR = 56;           // ZIP64 end header size
 123     static final int  ZIP64_LOCHDR = 20;           // ZIP64 end loc header size
 124     static final int  ZIP64_EXTHDR = 24;           // EXT header size
 125     static final int  ZIP64_EXTID  = 0x0001;       // Extra field Zip64 header ID
 126 
 127     static final int  ZIP64_MINVAL32 = 0xFFFF;
 128     static final long ZIP64_MINVAL = 0xFFFFFFFFL;
 129 
 130     /*
 131      * Zip64 End of central directory (END) header field offsets
 132      */
 133     static final int  ZIP64_ENDLEN = 4;       // size of zip64 end of central dir
 134     static final int  ZIP64_ENDVEM = 12;      // version made by
 135     static final int  ZIP64_ENDVER = 14;      // version needed to extract
 136     static final int  ZIP64_ENDNMD = 16;      // number of this disk
 137     static final int  ZIP64_ENDDSK = 20;      // disk number of start
 138     static final int  ZIP64_ENDTOD = 24;      // total number of entries on this disk
 139     static final int  ZIP64_ENDTOT = 32;      // total number of entries
 140     static final int  ZIP64_ENDSIZ = 40;      // central directory size in bytes
 141     static final int  ZIP64_ENDOFF = 48;      // offset of first CEN header
 142     static final int  ZIP64_ENDEXT = 56;      // zip64 extensible data sector
 143 
 144     /*
 145      * Zip64 End of central directory locator field offsets
 146      */
 147     static final int  ZIP64_LOCDSK = 4;       // disk number start
 148     static final int  ZIP64_LOCOFF = 8;       // offset of zip64 end
 149     static final int  ZIP64_LOCTOT = 16;      // total number of disks
 150 
 151     /*
 152      * Zip64 Extra local (EXT) header field offsets
 153      */
 154     static final int  ZIP64_EXTCRC = 4;       // uncompressed file crc-32 value
 155     static final int  ZIP64_EXTSIZ = 8;       // compressed size, 8-byte
 156     static final int  ZIP64_EXTLEN = 16;      // uncompressed size, 8-byte
 157 
 158     /*
 159      * Extra field header ID
 160      */
 161     static final int  EXTID_ZIP64 = 0x0001;      // ZIP64
 162     static final int  EXTID_NTFS  = 0x000a;      // NTFS
 163     static final int  EXTID_UNIX  = 0x000d;      // UNIX
 164     static final int  EXTID_EFS   = 0x0017;      // Strong Encryption
 165     static final int  EXTID_EXTT  = 0x5455;      // Info-ZIP Extended Timestamp
 166 
 167     /*
 168      * fields access methods
 169      */
 170     ///////////////////////////////////////////////////////
 171     static final int CH(byte[] b, int n) {
 172         return Byte.toUnsignedInt(b[n]);
 173     }
 174 
 175     static final int SH(byte[] b, int n) {
 176         return Byte.toUnsignedInt(b[n]) | (Byte.toUnsignedInt(b[n + 1]) << 8);
 177     }
 178 
 179     static final long LG(byte[] b, int n) {
 180         return ((SH(b, n)) | (SH(b, n + 2) << 16)) & 0xffffffffL;
 181     }
 182 
 183     static final long LL(byte[] b, int n) {
 184         return (LG(b, n)) | (LG(b, n + 4) << 32);
 185     }
 186 
 187     static long getSig(byte[] b, int n) { return LG(b, n); }
 188 
 189     private static boolean pkSigAt(byte[] b, int n, int b1, int b2) {
 190         return b[n] == 'P' & b[n + 1] == 'K' & b[n + 2] == b1 & b[n + 3] == b2;
 191     }
 192 
 193     static boolean cenSigAt(byte[] b, int n) { return pkSigAt(b, n, 1, 2); }
 194     static boolean locSigAt(byte[] b, int n) { return pkSigAt(b, n, 3, 4); }
 195     static boolean endSigAt(byte[] b, int n) { return pkSigAt(b, n, 5, 6); }
 196     static boolean extSigAt(byte[] b, int n) { return pkSigAt(b, n, 7, 8); }
 197     static boolean end64SigAt(byte[] b, int n) { return pkSigAt(b, n, 6, 6); }
 198     static boolean locator64SigAt(byte[] b, int n) { return pkSigAt(b, n, 6, 7); }
 199 
 200     // local file (LOC) header fields
 201     static final long LOCSIG(byte[] b) { return LG(b, 0); } // signature
 202     static final int  LOCVER(byte[] b) { return SH(b, 4); } // version needed to extract
 203     static final int  LOCFLG(byte[] b) { return SH(b, 6); } // general purpose bit flags
 204     static final int  LOCHOW(byte[] b) { return SH(b, 8); } // compression method
 205     static final long LOCTIM(byte[] b) { return LG(b, 10);} // modification time
 206     static final long LOCCRC(byte[] b) { return LG(b, 14);} // crc of uncompressed data
 207     static final long LOCSIZ(byte[] b) { return LG(b, 18);} // compressed data size
 208     static final long LOCLEN(byte[] b) { return LG(b, 22);} // uncompressed data size
 209     static final int  LOCNAM(byte[] b) { return SH(b, 26);} // filename length
 210     static final int  LOCEXT(byte[] b) { return SH(b, 28);} // extra field length
 211 
 212     // extra local (EXT) header fields
 213     static final long EXTCRC(byte[] b) { return LG(b, 4);}  // crc of uncompressed data
 214     static final long EXTSIZ(byte[] b) { return LG(b, 8);}  // compressed size
 215     static final long EXTLEN(byte[] b) { return LG(b, 12);} // uncompressed size
 216 
 217     // end of central directory header (END) fields
 218     static final int  ENDSUB(byte[] b) { return SH(b, 8); }  // number of entries on this disk
 219     static final int  ENDTOT(byte[] b) { return SH(b, 10);}  // total number of entries
 220     static final long ENDSIZ(byte[] b) { return LG(b, 12);}  // central directory size
 221     static final long ENDOFF(byte[] b) { return LG(b, 16);}  // central directory offset
 222     static final int  ENDCOM(byte[] b) { return SH(b, 20);}  // size of zip file comment
 223     static final int  ENDCOM(byte[] b, int off) { return SH(b, off + 20);}
 224 
 225     // zip64 end of central directory recoder fields
 226     static final long ZIP64_ENDTOD(byte[] b) { return LL(b, 24);}  // total number of entries on disk
 227     static final long ZIP64_ENDTOT(byte[] b) { return LL(b, 32);}  // total number of entries
 228     static final long ZIP64_ENDSIZ(byte[] b) { return LL(b, 40);}  // central directory size
 229     static final long ZIP64_ENDOFF(byte[] b) { return LL(b, 48);}  // central directory offset
 230     static final long ZIP64_LOCOFF(byte[] b) { return LL(b, 8);}   // zip64 end offset
 231 
 232     // central directory header (CEN) fields
 233     static final long CENSIG(byte[] b, int pos) { return LG(b, pos + 0); }
 234     static final int  CENVEM(byte[] b, int pos) { return SH(b, pos + 4); }

 235     static final int  CENVER(byte[] b, int pos) { return SH(b, pos + 6); }
 236     static final int  CENFLG(byte[] b, int pos) { return SH(b, pos + 8); }
 237     static final int  CENHOW(byte[] b, int pos) { return SH(b, pos + 10);}
 238     static final long CENTIM(byte[] b, int pos) { return LG(b, pos + 12);}
 239     static final long CENCRC(byte[] b, int pos) { return LG(b, pos + 16);}
 240     static final long CENSIZ(byte[] b, int pos) { return LG(b, pos + 20);}
 241     static final long CENLEN(byte[] b, int pos) { return LG(b, pos + 24);}
 242     static final int  CENNAM(byte[] b, int pos) { return SH(b, pos + 28);}
 243     static final int  CENEXT(byte[] b, int pos) { return SH(b, pos + 30);}
 244     static final int  CENCOM(byte[] b, int pos) { return SH(b, pos + 32);}
 245     static final int  CENDSK(byte[] b, int pos) { return SH(b, pos + 34);}
 246     static final int  CENATT(byte[] b, int pos) { return SH(b, pos + 36);}
 247     static final long CENATX(byte[] b, int pos) { return LG(b, pos + 38);}

 248     static final long CENOFF(byte[] b, int pos) { return LG(b, pos + 42);}
 249 
 250     /* The END header is followed by a variable length comment of size < 64k. */
 251     static final long END_MAXLEN = 0xFFFF + ENDHDR;
 252     static final int READBLOCKSZ = 128;
 253 }
--- EOF ---