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