J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1996-1999 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.io; |
| 27 | import java.io.*; |
| 28 | |
| 29 | public class CharToByteISO2022JP extends CharToByteJIS0208 { |
| 30 | |
| 31 | private static final int ASCII = 0; // ESC ( B |
| 32 | private static final int JISX0201_1976 = 1; // ESC ( J |
| 33 | private static final int JISX0208_1978 = 2; // ESC $ @ |
| 34 | private static final int JISX0208_1983 = 3; // ESC $ B |
| 35 | private static final int JISX0201_1976_KANA = 4; // ESC ( I |
| 36 | |
| 37 | private char highHalfZoneCode; |
| 38 | private boolean flushed = true; |
| 39 | |
| 40 | // JIS is state full encoding, so currentMode keep the |
| 41 | // current codeset |
| 42 | private int currentMode = ASCII; |
| 43 | |
| 44 | /** |
| 45 | * Bytes for substitute for unmappable input. |
| 46 | */ |
| 47 | // XXX: Assumes subBytes are ASCII string. Need to change Escape sequence |
| 48 | // for other character sets. |
| 49 | protected byte[] subBytesEscape = { (byte)0x1b, (byte)0x28, (byte)0x42 }; // ESC ( B |
| 50 | protected int subBytesMode = ASCII; |
| 51 | |
| 52 | public int flush(byte[] output, int outStart, int outEnd) |
| 53 | throws MalformedInputException, ConversionBufferFullException |
| 54 | { |
| 55 | if (highHalfZoneCode != 0) { |
| 56 | highHalfZoneCode = 0; |
| 57 | badInputLength = 0; |
| 58 | throw new MalformedInputException(); |
| 59 | } |
| 60 | |
| 61 | if (!flushed && (currentMode != ASCII)) { |
| 62 | if (outEnd - outStart < 3) { |
| 63 | throw new ConversionBufferFullException(); |
| 64 | } |
| 65 | output[outStart] = (byte)0x1b; |
| 66 | output[outStart + 1] = (byte)0x28; |
| 67 | output[outStart + 2] = (byte)0x42; |
| 68 | byteOff += 3; |
| 69 | byteOff = charOff = 0; |
| 70 | flushed = true; |
| 71 | currentMode = ASCII; |
| 72 | return 3; |
| 73 | } |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | public int convert(char[] input, int inOff, int inEnd, |
| 78 | byte[] output, int outOff, int outEnd) |
| 79 | throws MalformedInputException, UnknownCharacterException, |
| 80 | ConversionBufferFullException |
| 81 | |
| 82 | { |
| 83 | char inputChar; // Input character to be converted |
| 84 | int inputSize; // Size of the input |
| 85 | int outputSize; // Size of the output |
| 86 | |
| 87 | // Buffer for output bytes |
| 88 | byte[] tmpArray = new byte[6]; |
| 89 | byte[] outputByte; |
| 90 | |
| 91 | flushed = false; |
| 92 | |
| 93 | // Make copies of input and output indexes |
| 94 | charOff = inOff; |
| 95 | byteOff = outOff; |
| 96 | |
| 97 | if (highHalfZoneCode != 0) { |
| 98 | inputChar = highHalfZoneCode; |
| 99 | highHalfZoneCode = 0; |
| 100 | if (input[inOff] >= 0xdc00 && input[inOff] <= 0xdfff) { |
| 101 | // This is legal UTF16 sequence. |
| 102 | badInputLength = 1; |
| 103 | throw new UnknownCharacterException(); |
| 104 | } else { |
| 105 | // This is illegal UTF16 sequence. |
| 106 | badInputLength = 0; |
| 107 | throw new MalformedInputException(); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | // Loop until we run out of input |
| 112 | while(charOff < inEnd) { |
| 113 | outputByte = tmpArray; |
| 114 | int newMode = currentMode; // Trace character mode changing |
| 115 | |
| 116 | // Get the input character |
| 117 | inputChar = input[charOff]; |
| 118 | inputSize = 1; |
| 119 | outputSize = 1; |
| 120 | |
| 121 | // Is this a high surrogate? |
| 122 | if(inputChar >= '\uD800' && inputChar <= '\uDBFF') { |
| 123 | // Is this the last character of the input? |
| 124 | if (charOff + 1 >= inEnd) { |
| 125 | highHalfZoneCode = inputChar; |
| 126 | break; |
| 127 | } |
| 128 | |
| 129 | // Is there a low surrogate following? |
| 130 | inputChar = input[charOff + 1]; |
| 131 | if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') { |
| 132 | // We have a valid surrogate pair. Too bad we don't do |
| 133 | // surrogates. Is substitution enabled? |
| 134 | if (subMode) { |
| 135 | if (currentMode != subBytesMode) { |
| 136 | System.arraycopy(subBytesEscape, 0, outputByte, 0, |
| 137 | subBytesEscape.length); |
| 138 | outputSize = subBytesEscape.length; |
| 139 | System.arraycopy(subBytes, 0, outputByte, |
| 140 | outputSize, subBytes.length); |
| 141 | outputSize += subBytes.length; |
| 142 | newMode = subBytesMode; |
| 143 | } else { |
| 144 | outputByte = subBytes; |
| 145 | outputSize = subBytes.length; |
| 146 | } |
| 147 | inputSize = 2; |
| 148 | } else { |
| 149 | badInputLength = 2; |
| 150 | throw new UnknownCharacterException(); |
| 151 | } |
| 152 | } else { |
| 153 | // We have a malformed surrogate pair |
| 154 | badInputLength = 1; |
| 155 | throw new MalformedInputException(); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | // Is this an unaccompanied low surrogate? |
| 160 | else if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') { |
| 161 | badInputLength = 1; |
| 162 | throw new MalformedInputException(); |
| 163 | } else { |
| 164 | // Not part of a surrogate |
| 165 | |
| 166 | // Does this map to the Roman range? |
| 167 | if (inputChar <= '\u007F') { |
| 168 | if (currentMode != ASCII) { |
| 169 | outputByte[0] = (byte)0x1b; |
| 170 | outputByte[1] = (byte)0x28; |
| 171 | outputByte[2] = (byte)0x42; |
| 172 | outputByte[3] = (byte)inputChar; |
| 173 | outputSize = 4; |
| 174 | newMode = ASCII; |
| 175 | } else { |
| 176 | outputByte[0] = (byte)inputChar; |
| 177 | outputSize = 1; |
| 178 | } |
| 179 | } |
| 180 | // Is it a single byte kana? |
| 181 | else if (inputChar >= 0xFF61 && inputChar <= 0xFF9F) { |
| 182 | if (currentMode != JISX0201_1976_KANA) { |
| 183 | outputByte[0] = (byte)0x1b; |
| 184 | outputByte[1] = (byte)0x28; |
| 185 | outputByte[2] = (byte)0x49; |
| 186 | outputByte[3] = (byte)(inputChar - 0xff40); |
| 187 | outputSize = 4; |
| 188 | newMode = JISX0201_1976_KANA; |
| 189 | } else { |
| 190 | outputByte[0] = (byte)(inputChar - 0xff40); |
| 191 | outputSize = 1; |
| 192 | } |
| 193 | } |
| 194 | // Is it a yen sign? |
| 195 | else if (inputChar == '\u00A5') { |
| 196 | if (currentMode != JISX0201_1976) { |
| 197 | outputByte[0] = (byte)0x1b; |
| 198 | outputByte[1] = (byte)0x28; |
| 199 | outputByte[2] = (byte)0x4a; |
| 200 | outputByte[3] = (byte)0x5c; |
| 201 | outputSize = 4; |
| 202 | newMode = JISX0201_1976; |
| 203 | } else { |
| 204 | outputByte[0] = (byte)0x5C; |
| 205 | outputSize = 1; |
| 206 | } |
| 207 | } |
| 208 | // Is it a tilde? |
| 209 | else if (inputChar == '\u203E') |
| 210 | { |
| 211 | if (currentMode != JISX0201_1976) { |
| 212 | outputByte[0] = (byte)0x1b; |
| 213 | outputByte[1] = (byte)0x28; |
| 214 | outputByte[2] = (byte)0x4a; |
| 215 | outputByte[3] = (byte)0x7e; |
| 216 | outputSize = 4; |
| 217 | newMode = JISX0201_1976; |
| 218 | } else { |
| 219 | outputByte[0] = (byte)0x7e; |
| 220 | outputSize = 1; |
| 221 | } |
| 222 | } |
| 223 | // Is it a JIS-X-0208 character? |
| 224 | else { |
| 225 | int index = getNative(inputChar); |
| 226 | if (index != 0) { |
| 227 | if (currentMode != JISX0208_1983) { |
| 228 | outputByte[0] = (byte)0x1b; |
| 229 | outputByte[1] = (byte)0x24; |
| 230 | outputByte[2] = (byte)0x42; |
| 231 | outputByte[3] = (byte)(index >> 8); |
| 232 | outputByte[4] = (byte)(index & 0xff); |
| 233 | outputSize = 5; |
| 234 | newMode = JISX0208_1983; |
| 235 | } else { |
| 236 | outputByte[0] = (byte)(index >> 8); |
| 237 | outputByte[1] = (byte)(index & 0xff); |
| 238 | outputSize = 2; |
| 239 | } |
| 240 | } |
| 241 | // It doesn't map to JIS-0208! |
| 242 | else { |
| 243 | if (subMode) { |
| 244 | if (currentMode != subBytesMode) { |
| 245 | System.arraycopy(subBytesEscape, 0, outputByte, 0, |
| 246 | subBytesEscape.length); |
| 247 | outputSize = subBytesEscape.length; |
| 248 | System.arraycopy(subBytes, 0, outputByte, |
| 249 | outputSize, subBytes.length); |
| 250 | outputSize += subBytes.length; |
| 251 | newMode = subBytesMode; |
| 252 | } else { |
| 253 | outputByte = subBytes; |
| 254 | outputSize = subBytes.length; |
| 255 | } |
| 256 | } else { |
| 257 | badInputLength = 1; |
| 258 | throw new UnknownCharacterException(); |
| 259 | } |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | // Is there room in the output buffer? |
| 265 | // XXX: The code assumes output buffer can hold at least 5 bytes, |
| 266 | // in this coverter case. However, there is no way for apps to |
| 267 | // see how many bytes will be necessary for next call. |
| 268 | // getMaxBytesPerChar() should be overriden in every subclass of |
| 269 | // CharToByteConverter and reflect real value (5 for this). |
| 270 | if (byteOff + outputSize > outEnd) |
| 271 | throw new ConversionBufferFullException(); |
| 272 | |
| 273 | // Put the output into the buffer |
| 274 | for ( int i = 0 ; i < outputSize ; i++ ) |
| 275 | output[byteOff++] = outputByte[i]; |
| 276 | |
| 277 | // Advance the input pointer |
| 278 | charOff += inputSize; |
| 279 | |
| 280 | // We can successfuly output the characters, changes |
| 281 | // current mode. Fix for 4251646. |
| 282 | currentMode = newMode; |
| 283 | } |
| 284 | |
| 285 | // return mode ASCII at the end |
| 286 | if (currentMode != ASCII){ |
| 287 | if (byteOff + 3 > outEnd) |
| 288 | throw new ConversionBufferFullException(); |
| 289 | |
| 290 | output[byteOff++] = 0x1b; |
| 291 | output[byteOff++] = 0x28; |
| 292 | output[byteOff++] = 0x42; |
| 293 | currentMode = ASCII; |
| 294 | } |
| 295 | |
| 296 | // Return the length written to the output buffer |
| 297 | return byteOff-outOff; |
| 298 | } |
| 299 | |
| 300 | // Reset |
| 301 | public void reset() { |
| 302 | highHalfZoneCode = 0; |
| 303 | byteOff = charOff = 0; |
| 304 | currentMode = ASCII; |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * returns the maximum number of bytes needed to convert a char |
| 309 | */ |
| 310 | public int getMaxBytesPerChar() { |
| 311 | return 8; |
| 312 | } |
| 313 | |
| 314 | // Return the character set ID |
| 315 | public String getCharacterEncoding() { |
| 316 | return "ISO2022JP"; |
| 317 | } |
| 318 | |
| 319 | } |