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| 1 | +/* | |
| 2 | + * Copyright (c) 1997, 2010, 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.io; | |
| 27 | + | |
| 28 | +/** | |
| 29 | + * An algorithmic conversion from ISO 2022 to Unicode | |
| 30 | + * | |
| 31 | + * @author Tom Zhou | |
| 32 | + */ | |
| 33 | +public abstract class ByteToCharISO2022 extends ByteToCharConverter | |
| 34 | +{ | |
| 35 | + // Value to be filled by subclass | |
| 36 | + protected String SODesignator[]; | |
| 37 | + protected String SS2Designator[] = null; | |
| 38 | + protected String SS3Designator[] = null; | |
| 39 | + | |
| 40 | + protected ByteToCharConverter SOConverter[]; | |
| 41 | + protected ByteToCharConverter SS2Converter[] = null; | |
| 42 | + protected ByteToCharConverter SS3Converter[] = null; | |
| 43 | + | |
| 44 | + private static final byte ISO_ESC = 0x1b; | |
| 45 | + private static final byte ISO_SI = 0x0f; | |
| 46 | + private static final byte ISO_SO = 0x0e; | |
| 47 | + private static final byte ISO_SS2_7 = 0x4e; | |
| 48 | + private static final byte ISO_SS3_7 = 0x4f; | |
| 49 | + private static final byte MSB = (byte)0x80; | |
| 50 | + private static final char REPLACE_CHAR = '\uFFFD'; | |
| 51 | + private static final byte maximumDesignatorLength = 3; | |
| 52 | + | |
| 53 | + private static final byte SOFlag = 0; | |
| 54 | + private static final byte SS2Flag = 1; | |
| 55 | + private static final byte SS3Flag = 2; | |
| 56 | + private static final byte G0 = 0; | |
| 57 | + private static final byte G1 = 1; | |
| 58 | + | |
| 59 | + private ByteToCharConverter tmpConverter[]; | |
| 60 | + | |
| 61 | + private int curSODes, curSS2Des, curSS3Des; | |
| 62 | + private boolean shiftout; | |
| 63 | + | |
| 64 | + private byte remainByte[] = new byte[10]; | |
| 65 | + private int remainIndex = -1; | |
| 66 | + private byte state, firstByte; | |
| 67 | + | |
| 68 | + public void reset() | |
| 69 | + { | |
| 70 | + int i = 0; | |
| 71 | + | |
| 72 | + shiftout = false; | |
| 73 | + state = G0; | |
| 74 | + firstByte = 0; | |
| 75 | + | |
| 76 | + curSODes = 0; | |
| 77 | + curSS2Des = 0; | |
| 78 | + curSS3Des = 0; | |
| 79 | + | |
| 80 | + charOff = byteOff = 0; | |
| 81 | + remainIndex = -1; | |
| 82 | + | |
| 83 | + for(i = 0; i < remainByte.length; i++) | |
| 84 | + remainByte[i] = 0; | |
| 85 | + } | |
| 86 | + | |
| 87 | + public int flush(char[] output, int outStart, int outEnd) | |
| 88 | + throws MalformedInputException | |
| 89 | + { | |
| 90 | + int i; | |
| 91 | + if (state != G0) { | |
| 92 | + badInputLength = 0; | |
| 93 | + throw new MalformedInputException(); | |
| 94 | + } | |
| 95 | + reset(); | |
| 96 | + return 0; | |
| 97 | + } | |
| 98 | + | |
| 99 | + private byte[] savetyGetSrc(byte[] input, int inOff, int inEnd, int nbytes) | |
| 100 | + { | |
| 101 | + int i; | |
| 102 | + byte tmp[]; | |
| 103 | + | |
| 104 | + if(inOff <= (inEnd-nbytes+1)) | |
| 105 | + tmp = new byte[nbytes]; | |
| 106 | + else | |
| 107 | + tmp = new byte[inEnd-inOff]; | |
| 108 | + | |
| 109 | + for(i = 0; i < tmp.length; i++) | |
| 110 | + tmp[i] = input[inOff+i]; | |
| 111 | + return tmp; | |
| 112 | + } | |
| 113 | + | |
| 114 | + private char getUnicode(byte byte1, byte byte2, byte shiftFlag) | |
| 115 | + { | |
| 116 | + byte1 |= MSB; | |
| 117 | + byte2 |= MSB; | |
| 118 | + | |
| 119 | + byte[] tmpByte = {byte1,byte2}; | |
| 120 | + char[] tmpChar = new char[1]; | |
| 121 | + int i = 0, | |
| 122 | + tmpIndex = 0; | |
| 123 | + | |
| 124 | + switch(shiftFlag) { | |
| 125 | + case SOFlag: | |
| 126 | + tmpIndex = curSODes; | |
| 127 | + tmpConverter = SOConverter; | |
| 128 | + break; | |
| 129 | + case SS2Flag: | |
| 130 | + tmpIndex = curSS2Des; | |
| 131 | + tmpConverter = SS2Converter; | |
| 132 | + break; | |
| 133 | + case SS3Flag: | |
| 134 | + tmpIndex = curSS3Des; | |
| 135 | + tmpConverter = SS3Converter; | |
| 136 | + break; | |
| 137 | + } | |
| 138 | + | |
| 139 | + for(i = 0; i < tmpConverter.length; i++) { | |
| 140 | + if(tmpIndex == i) { | |
| 141 | + try { | |
| 142 | + tmpConverter[i].convert(tmpByte, 0, 2, tmpChar, 0, 1); | |
| 143 | + } catch (Exception e) {} | |
| 144 | + return tmpChar[0]; | |
| 145 | + } | |
| 146 | + } | |
| 147 | + return REPLACE_CHAR; | |
| 148 | + } | |
| 149 | + | |
| 150 | + public final int convert(byte[] input, int inOff, int inEnd, | |
| 151 | + char[] output, int outOff, int outEnd) | |
| 152 | + throws ConversionBufferFullException, | |
| 153 | + MalformedInputException | |
| 154 | + { | |
| 155 | + int i; | |
| 156 | + int DesignatorLength = 0; | |
| 157 | + charOff = outOff; | |
| 158 | + byteOff = inOff; | |
| 159 | + | |
| 160 | + // Loop until we hit the end of the input | |
| 161 | + while (byteOff < inEnd) { | |
| 162 | + // If we don't have room for the output, throw an exception | |
| 163 | + if (charOff >= outEnd) | |
| 164 | + throw new ConversionBufferFullException(); | |
| 165 | + if(remainIndex < 0) { | |
| 166 | + remainByte[0] = input[byteOff]; | |
| 167 | + remainIndex = 0; | |
| 168 | + byteOff++; | |
| 169 | + } | |
| 170 | + switch (remainByte[0]) { | |
| 171 | + case ISO_SO: | |
| 172 | + shiftout = true; | |
| 173 | + if(remainIndex > 0) | |
| 174 | + System.arraycopy(remainByte, 1, remainByte, 0, remainIndex); | |
| 175 | + remainIndex--; | |
| 176 | + break; | |
| 177 | + case ISO_SI: | |
| 178 | + shiftout = false; | |
| 179 | + if(remainIndex > 0) | |
| 180 | + System.arraycopy(remainByte, 1, remainByte, 0, remainIndex); | |
| 181 | + remainIndex--; | |
| 182 | + break; | |
| 183 | + case ISO_ESC: | |
| 184 | + byte tmp[] = savetyGetSrc(input, byteOff, inEnd, | |
| 185 | + (maximumDesignatorLength-remainIndex)); | |
| 186 | + System.arraycopy(tmp, 0, remainByte, remainIndex+1, tmp.length); | |
| 187 | + remainIndex += tmp.length; | |
| 188 | + byteOff += tmp.length; | |
| 189 | + if(tmp.length<(maximumDesignatorLength-remainIndex)) | |
| 190 | + break; | |
| 191 | + String tmpString = new String(remainByte, 1, remainIndex); | |
| 192 | + for (i = 0; i < SODesignator.length; i++) { | |
| 193 | + if(tmpString.indexOf(SODesignator[i]) == 0) { | |
| 194 | + curSODes = i; | |
| 195 | + DesignatorLength = SODesignator[i].length(); | |
| 196 | + break; | |
| 197 | + } | |
| 198 | + } | |
| 199 | + | |
| 200 | + if (DesignatorLength == 0 ) { // Designator not recognized | |
| 201 | + badInputLength = tmp.length; | |
| 202 | + throw new MalformedInputException(); | |
| 203 | + } | |
| 204 | + | |
| 205 | + if (i == SODesignator.length) { | |
| 206 | + for (i = 0; i < SS2Designator.length; i++) { | |
| 207 | + if(tmpString.indexOf(SS2Designator[i]) == 0) { | |
| 208 | + curSS2Des = i; | |
| 209 | + DesignatorLength = SS2Designator[i].length(); | |
| 210 | + break; | |
| 211 | + } | |
| 212 | + } | |
| 213 | + if(i == SS2Designator.length) { | |
| 214 | + for(i = 0; i < SS3Designator.length; i++) { | |
| 215 | + if (tmpString.indexOf(SS3Designator[i]) == 0) { | |
| 216 | + curSS3Des = i; | |
| 217 | + DesignatorLength = SS3Designator[i].length(); | |
| 218 | + break; | |
| 219 | + } | |
| 220 | + } | |
| 221 | + if (i == SS3Designator.length) { | |
| 222 | + switch(remainByte[1]) { | |
| 223 | + case ISO_SS2_7: | |
| 224 | + output[charOff] = getUnicode(remainByte[2], | |
| 225 | + remainByte[3], | |
| 226 | + SS2Flag); | |
| 227 | + charOff++; | |
| 228 | + DesignatorLength = 3; | |
| 229 | + break; | |
| 230 | + case ISO_SS3_7: | |
| 231 | + output[charOff] = getUnicode(remainByte[2], | |
| 232 | + remainByte[3], | |
| 233 | + SS3Flag); | |
| 234 | + charOff++; | |
| 235 | + DesignatorLength = 3; | |
| 236 | + break; | |
| 237 | + default: | |
| 238 | + DesignatorLength = 0; | |
| 239 | + } | |
| 240 | + } | |
| 241 | + } | |
| 242 | + } | |
| 243 | + if (remainIndex > DesignatorLength) { | |
| 244 | + for(i = 0; i < remainIndex-DesignatorLength; i++) | |
| 245 | + remainByte[i] = remainByte[DesignatorLength+1+i]; | |
| 246 | + remainIndex = i-1; | |
| 247 | + } else { | |
| 248 | + remainIndex = -1; | |
| 249 | + } | |
| 250 | + break; | |
| 251 | + default: | |
| 252 | + if (!shiftout) { | |
| 253 | + output[charOff] = (char)remainByte[0]; | |
| 254 | + charOff++; | |
| 255 | + } else { | |
| 256 | + switch (state) { | |
| 257 | + case G0: | |
| 258 | + firstByte = remainByte[0]; | |
| 259 | + state = G1; | |
| 260 | + break; | |
| 261 | + case G1: | |
| 262 | + output[charOff] = getUnicode(firstByte, remainByte[0], | |
| 263 | + SOFlag); | |
| 264 | + charOff++; | |
| 265 | + state = G0; | |
| 266 | + break; | |
| 267 | + } | |
| 268 | + } | |
| 269 | + if (remainIndex > 0) | |
| 270 | + System.arraycopy(remainByte, 1, remainByte, 0, remainIndex); | |
| 271 | + remainIndex--; | |
| 272 | + } | |
| 273 | + } | |
| 274 | + return charOff - outOff; | |
| 275 | + } | |
| 276 | +} | |