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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 | package sun.io; | ||
| 26 | |||
| 27 | import java.io.UnsupportedEncodingException; | ||
| 28 | import sun.nio.cs.ext.JISAutoDetect; | ||
| 29 | |||
| 30 | public class ByteToCharJISAutoDetect extends ByteToCharConverter { | ||
| 31 | |||
| 32 | private final static int EUCJP_MASK = 0x01; | ||
| 33 | private final static int SJIS2B_MASK = 0x02; | ||
| 34 | private final static int SJIS1B_MASK = 0x04; | ||
| 35 | private final static int EUCJP_KANA1_MASK = 0x08; | ||
| 36 | private final static int EUCJP_KANA2_MASK = 0x10; | ||
| 37 | private final static byte[] maskTable1 = JISAutoDetect.getByteMask1(); | ||
| 38 | private final static byte[] maskTable2 = JISAutoDetect.getByteMask2(); | ||
| 39 | |||
| 40 | private final static int SS2 = 0x8e; | ||
| 41 | private final static int SS3 = 0x8f; | ||
| 42 | |||
| 43 | // SJISName is set to either "SJIS" or "MS932" | ||
| 44 | private String SJISName; | ||
| 45 | private String EUCJPName; | ||
| 46 | |||
| 47 | private String convName = null; | ||
| 48 | private ByteToCharConverter detectedConv = null; | ||
| 49 | private ByteToCharConverter defaultConv = null; | ||
| 50 | |||
| 51 | public ByteToCharJISAutoDetect() { | ||
| 52 | super(); | ||
| 53 | SJISName = CharacterEncoding.getSJISName(); | ||
| 54 | EUCJPName = CharacterEncoding.getEUCJPName(); | ||
| 55 | defaultConv = new ByteToCharISO8859_1(); | ||
| 56 | defaultConv.subChars = subChars; | ||
| 57 | defaultConv.subMode = subMode; | ||
| 58 | } | ||
| 59 | |||
| 60 | public int flush(char [] output, int outStart, int outEnd) | ||
| 61 | throws MalformedInputException, ConversionBufferFullException | ||
| 62 | { | ||
| 63 | badInputLength = 0; | ||
| 64 | if(detectedConv != null) | ||
| 65 | return detectedConv.flush(output, outStart, outEnd); | ||
| 66 | else | ||
| 67 | return defaultConv.flush(output, outStart, outEnd); | ||
| 68 | } | ||
| 69 | |||
| 70 | |||
| 71 | /** | ||
| 72 | * Character conversion | ||
| 73 | */ | ||
| 74 | public int convert(byte[] input, int inOff, int inEnd, | ||
| 75 | char[] output, int outOff, int outEnd) | ||
| 76 | throws UnknownCharacterException, MalformedInputException, | ||
| 77 | ConversionBufferFullException | ||
| 78 | { | ||
| 79 | int num = 0; | ||
| 80 | |||
| 81 | charOff = outOff; | ||
| 82 | byteOff = inOff; | ||
| 83 | |||
| 84 | try { | ||
| 85 | if (detectedConv == null) { | ||
| 86 | int euckana = 0; | ||
| 87 | int ss2count = 0; | ||
| 88 | int firstmask = 0; | ||
| 89 | int secondmask = 0; | ||
| 90 | int cnt; | ||
| 91 | boolean nonAsciiFound = false; | ||
| 92 | |||
| 93 | for (cnt = inOff; cnt < inEnd; cnt++) { | ||
| 94 | firstmask = 0; | ||
| 95 | secondmask = 0; | ||
| 96 | int byte1 = input[cnt]&0xff; | ||
| 97 | int byte2; | ||
| 98 | |||
| 99 | // TODO: should check valid escape sequences! | ||
| 100 | if (byte1 == 0x1b) { | ||
| 101 | convName = "ISO2022JP"; | ||
| 102 | break; | ||
| 103 | } | ||
| 104 | |||
| 105 | // Try to convert all leading ASCII characters. | ||
| 106 | if ((nonAsciiFound == false) && (byte1 < 0x80)) { | ||
| 107 | if (charOff >= outEnd) | ||
| 108 | throw new ConversionBufferFullException(); | ||
| 109 | output[charOff++] = (char) byte1; | ||
| 110 | byteOff++; | ||
| 111 | num++; | ||
| 112 | continue; | ||
| 113 | } | ||
| 114 | |||
| 115 | // We can no longer convert ASCII. | ||
| 116 | nonAsciiFound = true; | ||
| 117 | |||
| 118 | firstmask = maskTable1[byte1]; | ||
| 119 | if (byte1 == SS2) | ||
| 120 | ss2count++; | ||
| 121 | |||
| 122 | if (firstmask != 0) { | ||
| 123 | if (cnt+1 < inEnd) { | ||
| 124 | byte2 = input[++cnt] & 0xff; | ||
| 125 | secondmask = maskTable2[byte2]; | ||
| 126 | int mask = firstmask & secondmask; | ||
| 127 | if (mask == EUCJP_MASK) { | ||
| 128 | convName = EUCJPName; | ||
| 129 | break; | ||
| 130 | } | ||
| 131 | if ((mask == SJIS2B_MASK) || (mask == SJIS1B_MASK) | ||
| 132 | || (JISAutoDetect.canBeSJIS1B(firstmask) && secondmask == 0)) { | ||
| 133 | convName = SJISName; | ||
| 134 | break; | ||
| 135 | } | ||
| 136 | |||
| 137 | // If the first byte is a SS3 and the third byte | ||
| 138 | // is not an EUC byte, it should be SJIS. | ||
| 139 | // Otherwise, we can't determine it yet, but it's | ||
| 140 | // very likely SJIS. So we don't take the EUCJP CS3 | ||
| 141 | // character boundary. If we tried both | ||
| 142 | // possibilities here, it might be able to be | ||
| 143 | // determined correctly. | ||
| 144 | if ((byte1 == SS3) && JISAutoDetect.canBeEUCJP(secondmask)) { | ||
| 145 | if (cnt+1 < inEnd) { | ||
| 146 | int nextbyte = input[cnt+1] & 0xff; | ||
| 147 | if (! JISAutoDetect.canBeEUCJP(maskTable2[nextbyte])) | ||
| 148 | convName = SJISName; | ||
| 149 | } else | ||
| 150 | convName = SJISName; | ||
| 151 | } | ||
| 152 | if (JISAutoDetect.canBeEUCKana(firstmask, secondmask)) | ||
| 153 | euckana++; | ||
| 154 | } else { | ||
| 155 | if ((firstmask & SJIS1B_MASK) != 0) { | ||
| 156 | convName = SJISName; | ||
| 157 | break; | ||
| 158 | } | ||
| 159 | } | ||
| 160 | } | ||
| 161 | } | ||
| 162 | |||
| 163 | if (nonAsciiFound && (convName == null)) { | ||
| 164 | if ((euckana > 1) || (ss2count > 1)) | ||
| 165 | convName = EUCJPName; | ||
| 166 | else | ||
| 167 | convName = SJISName; | ||
| 168 | } | ||
| 169 | |||
| 170 | if (convName != null) { | ||
| 171 | try { | ||
| 172 | detectedConv = ByteToCharConverter.getConverter(convName); | ||
| 173 | detectedConv.subChars = subChars; | ||
| 174 | detectedConv.subMode = subMode; | ||
| 175 | } catch (UnsupportedEncodingException e){ | ||
| 176 | detectedConv = null; | ||
| 177 | convName = null; | ||
| 178 | } | ||
| 179 | } | ||
| 180 | } | ||
| 181 | } catch (ConversionBufferFullException bufferFullException) { | ||
| 182 | throw bufferFullException; | ||
| 183 | } catch (Exception e) { | ||
| 184 | // If we fail to detect the converter needed for any reason, | ||
| 185 | // use the default converter. | ||
| 186 | detectedConv = defaultConv; | ||
| 187 | } | ||
| 188 | |||
| 189 | // If we've converted all ASCII characters, then return. | ||
| 190 | if (byteOff == inEnd) { | ||
| 191 | return num; | ||
| 192 | } | ||
| 193 | |||
| 194 | if(detectedConv != null) { | ||
| 195 | try { | ||
| 196 | num += detectedConv.convert(input, inOff + num, inEnd, | ||
| 197 | output, outOff + num, outEnd); | ||
| 198 | } finally { | ||
| 199 | charOff = detectedConv.nextCharIndex(); | ||
| 200 | byteOff = detectedConv.nextByteIndex(); | ||
| 201 | badInputLength = detectedConv.badInputLength; | ||
| 202 | } | ||
| 203 | } else { | ||
| 204 | try { | ||
| 205 | num += defaultConv.convert(input, inOff + num, inEnd, | ||
| 206 | output, outOff + num, outEnd); | ||
| 207 | } finally { | ||
| 208 | charOff = defaultConv.nextCharIndex(); | ||
| 209 | byteOff = defaultConv.nextByteIndex(); | ||
| 210 | badInputLength = defaultConv.badInputLength; | ||
| 211 | } | ||
| 212 | } | ||
| 213 | return num; | ||
| 214 | } | ||
| 215 | |||
| 216 | public void reset() { | ||
| 217 | if(detectedConv != null) { | ||
| 218 | detectedConv.reset(); | ||
| 219 | detectedConv = null; | ||
| 220 | convName = null; | ||
| 221 | } else | ||
| 222 | defaultConv.reset(); | ||
| 223 | charOff = byteOff = 0; | ||
| 224 | } | ||
| 225 | |||
| 226 | public String getCharacterEncoding() { | ||
| 227 | return "JISAutoDetect"; | ||
| 228 | } | ||
| 229 | |||
| 230 | public String toString() { | ||
| 231 | String s = getCharacterEncoding(); | ||
| 232 | if (detectedConv != null) { | ||
| 233 | s += "[" + detectedConv.getCharacterEncoding() + "]"; | ||
| 234 | } else { | ||
| 235 | s += "[unknown]"; | ||
| 236 | } | ||
| 237 | return s; | ||
| 238 | } | ||
| 239 | } | ||