1 /*
2 * Copyright (c) 2000, 2017, 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 sun.nio.cs;
27
28 import java.nio.ByteBuffer;
29 import java.nio.CharBuffer;
30 import java.nio.charset.Charset;
31 import java.nio.charset.CharsetDecoder;
32 import java.nio.charset.CharsetEncoder;
33 import java.nio.charset.CoderResult;
34 import java.util.Objects;
35
36 import jdk.internal.HotSpotIntrinsicCandidate;
37
38 public class ISO_8859_1
39 extends Charset
40 implements HistoricallyNamedCharset
41 {
42
43 public static final ISO_8859_1 INSTANCE = new ISO_8859_1();
44
45 public ISO_8859_1() {
46 super("ISO-8859-1", StandardCharsets.aliases_ISO_8859_1());
47 }
48
49 public String historicalName() {
50 return "ISO8859_1";
51 }
52
53 public boolean contains(Charset cs) {
54 return ((cs instanceof US_ASCII)
55 || (cs instanceof ISO_8859_1));
56 }
57
58 public CharsetDecoder newDecoder() {
59 return new Decoder(this);
60 }
61
62 public CharsetEncoder newEncoder() {
63 return new Encoder(this);
64 }
65
66 private static class Decoder extends CharsetDecoder {
67
68 private Decoder(Charset cs) {
69 super(cs, 1.0f, 1.0f);
70 }
71
72 private CoderResult decodeArrayLoop(ByteBuffer src,
73 CharBuffer dst)
74 {
75 byte[] sa = src.array();
76 int sp = src.arrayOffset() + src.position();
77 int sl = src.arrayOffset() + src.limit();
78 assert (sp <= sl);
79 sp = (sp <= sl ? sp : sl);
80 char[] da = dst.array();
81 int dp = dst.arrayOffset() + dst.position();
82 int dl = dst.arrayOffset() + dst.limit();
83 assert (dp <= dl);
84 dp = (dp <= dl ? dp : dl);
85
86 try {
87 while (sp < sl) {
88 byte b = sa[sp];
89 if (dp >= dl)
90 return CoderResult.OVERFLOW;
91 da[dp++] = (char)(b & 0xff);
92 sp++;
93 }
94 return CoderResult.UNDERFLOW;
95 } finally {
96 src.position(sp - src.arrayOffset());
97 dst.position(dp - dst.arrayOffset());
98 }
99 }
100
101 private CoderResult decodeBufferLoop(ByteBuffer src,
102 CharBuffer dst)
103 {
104 int mark = src.position();
105 try {
106 while (src.hasRemaining()) {
107 byte b = src.get();
108 if (!dst.hasRemaining())
109 return CoderResult.OVERFLOW;
110 dst.put((char)(b & 0xff));
111 mark++;
112 }
113 return CoderResult.UNDERFLOW;
114 } finally {
115 src.position(mark);
116 }
117 }
118
119 protected CoderResult decodeLoop(ByteBuffer src,
120 CharBuffer dst)
121 {
122 if (src.hasArray() && dst.hasArray())
123 return decodeArrayLoop(src, dst);
124 else
125 return decodeBufferLoop(src, dst);
126 }
127 }
128
129 private static class Encoder extends CharsetEncoder {
130
131 private Encoder(Charset cs) {
132 super(cs, 1.0f, 1.0f);
133 }
134
135 public boolean canEncode(char c) {
136 return c <= '\u00FF';
137 }
138
139 public boolean isLegalReplacement(byte[] repl) {
140 return true; // we accept any byte value
141 }
142
143 private final Surrogate.Parser sgp = new Surrogate.Parser();
144
145 // Method possible replaced with a compiler intrinsic.
146 private static int encodeISOArray(char[] sa, int sp,
147 byte[] da, int dp, int len) {
148 if (len <= 0) {
149 return 0;
150 }
151 encodeISOArrayCheck(sa, sp, da, dp, len);
152 return implEncodeISOArray(sa, sp, da, dp, len);
153 }
154
155 @HotSpotIntrinsicCandidate
156 private static int implEncodeISOArray(char[] sa, int sp,
157 byte[] da, int dp, int len)
158 {
159 int i = 0;
160 for (; i < len; i++) {
161 char c = sa[sp++];
162 if (c > '\u00FF')
163 break;
164 da[dp++] = (byte)c;
165 }
166 return i;
167 }
168
169 private static void encodeISOArrayCheck(char[] sa, int sp,
170 byte[] da, int dp, int len) {
171 Objects.requireNonNull(sa);
172 Objects.requireNonNull(da);
173
174 if (sp < 0 || sp >= sa.length) {
175 throw new ArrayIndexOutOfBoundsException(sp);
176 }
177
178 if (dp < 0 || dp >= da.length) {
179 throw new ArrayIndexOutOfBoundsException(dp);
180 }
181
182 int endIndexSP = sp + len - 1;
183 if (endIndexSP < 0 || endIndexSP >= sa.length) {
184 throw new ArrayIndexOutOfBoundsException(endIndexSP);
185 }
186
187 int endIndexDP = dp + len - 1;
188 if (endIndexDP < 0 || endIndexDP >= da.length) {
189 throw new ArrayIndexOutOfBoundsException(endIndexDP);
190 }
191 }
192
193 private CoderResult encodeArrayLoop(CharBuffer src,
194 ByteBuffer dst)
195 {
196 char[] sa = src.array();
197 int soff = src.arrayOffset();
198 int sp = soff + src.position();
199 int sl = soff + src.limit();
200 assert (sp <= sl);
201 sp = (sp <= sl ? sp : sl);
202 byte[] da = dst.array();
203 int doff = dst.arrayOffset();
204 int dp = doff + dst.position();
205 int dl = doff + dst.limit();
206 assert (dp <= dl);
207 dp = (dp <= dl ? dp : dl);
208 int dlen = dl - dp;
209 int slen = sl - sp;
210 int len = (dlen < slen) ? dlen : slen;
211 try {
212 int ret = encodeISOArray(sa, sp, da, dp, len);
213 sp = sp + ret;
214 dp = dp + ret;
215 if (ret != len) {
216 if (sgp.parse(sa[sp], sa, sp, sl) < 0)
217 return sgp.error();
218 return sgp.unmappableResult();
219 }
220 if (len < slen)
221 return CoderResult.OVERFLOW;
222 return CoderResult.UNDERFLOW;
223 } finally {
224 src.position(sp - soff);
225 dst.position(dp - doff);
226 }
227 }
228
229 private CoderResult encodeBufferLoop(CharBuffer src,
230 ByteBuffer dst)
231 {
232 int mark = src.position();
233 try {
234 while (src.hasRemaining()) {
235 char c = src.get();
236 if (c <= '\u00FF') {
237 if (!dst.hasRemaining())
238 return CoderResult.OVERFLOW;
239 dst.put((byte)c);
240 mark++;
241 continue;
242 }
243 if (sgp.parse(c, src) < 0)
244 return sgp.error();
245 return sgp.unmappableResult();
246 }
247 return CoderResult.UNDERFLOW;
248 } finally {
249 src.position(mark);
250 }
251 }
252
253 protected CoderResult encodeLoop(CharBuffer src,
254 ByteBuffer dst)
255 {
256 if (src.hasArray() && dst.hasArray())
257 return encodeArrayLoop(src, dst);
258 else
259 return encodeBufferLoop(src, dst);
260 }
261 }
262 }