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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 2002, 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 | * @author Limin Shi | ||
| 30 | * Sean Jiang | ||
| 31 | */ | ||
| 32 | |||
| 33 | public abstract class ByteToCharDoubleByte extends ByteToCharConverter { | ||
| 34 | protected byte savedByte; | ||
| 35 | |||
| 36 | /* | ||
| 37 | * 1st level index, provided by subclass | ||
| 38 | */ | ||
| 39 | protected short index1[]; | ||
| 40 | |||
| 41 | /* | ||
| 42 | * 2nd level index, provided by subclass | ||
| 43 | * every string has 0x10*(end-start+1) characters. | ||
| 44 | */ | ||
| 45 | protected String index2[]; | ||
| 46 | |||
| 47 | protected int start; | ||
| 48 | protected int end; | ||
| 49 | |||
| 50 | /* | ||
| 51 | * Size of bad input that caused conversion to stop | ||
| 52 | */ | ||
| 53 | protected int badInputLength; | ||
| 54 | |||
| 55 | public ByteToCharDoubleByte() { | ||
| 56 | super(); | ||
| 57 | savedByte = 0; | ||
| 58 | } | ||
| 59 | |||
| 60 | |||
| 61 | public short[] getIndex1() { | ||
| 62 | return(index1); | ||
| 63 | } | ||
| 64 | |||
| 65 | public String[] getIndex2() { | ||
| 66 | return(index2); | ||
| 67 | } | ||
| 68 | |||
| 69 | public int flush(char[] output, int outStart, int outEnd) | ||
| 70 | throws MalformedInputException | ||
| 71 | { | ||
| 72 | if (savedByte != 0) { | ||
| 73 | reset(); | ||
| 74 | badInputLength = 0; | ||
| 75 | throw new MalformedInputException(); | ||
| 76 | } | ||
| 77 | reset(); | ||
| 78 | return 0; | ||
| 79 | } | ||
| 80 | |||
| 81 | /** | ||
| 82 | * Converts sequences of bytes to characters. | ||
| 83 | * Conversions that result in Exceptions can be restarted by calling | ||
| 84 | * convert again, with appropriately modified parameters. | ||
| 85 | * @return the characters written to output. | ||
| 86 | * @param input byte array containing text in Double/single Byte | ||
| 87 | * @param inStart offset in input array | ||
| 88 | * @param inEnd offset of last byte to be converted | ||
| 89 | * @param output character array to receive conversion result | ||
| 90 | * @param outStart starting offset | ||
| 91 | * @param outEnd offset of last byte to be written to | ||
| 92 | * @throw UnsupportedCharacterException for any bytes | ||
| 93 | * that cannot be converted to the external character set. | ||
| 94 | */ | ||
| 95 | public int convert(byte[] input, int inOff, int inEnd, | ||
| 96 | char[] output, int outOff, int outEnd) | ||
| 97 | throws UnknownCharacterException, MalformedInputException, | ||
| 98 | ConversionBufferFullException | ||
| 99 | { | ||
| 100 | char outputChar = REPLACE_CHAR; | ||
| 101 | int inputSize = 0; // Size of input | ||
| 102 | |||
| 103 | // Record beginning offsets | ||
| 104 | charOff = outOff; | ||
| 105 | byteOff = inOff; | ||
| 106 | |||
| 107 | // Loop until we hit the end of the input | ||
| 108 | while (byteOff < inEnd) { | ||
| 109 | int byte1, byte2; | ||
| 110 | |||
| 111 | if (savedByte == 0) { | ||
| 112 | byte1 = input[byteOff]; | ||
| 113 | inputSize = 1; | ||
| 114 | } else { | ||
| 115 | byte1 = savedByte; | ||
| 116 | savedByte = 0; | ||
| 117 | inputSize = 0; | ||
| 118 | } | ||
| 119 | |||
| 120 | outputChar = convSingleByte(byte1); | ||
| 121 | |||
| 122 | if (outputChar == REPLACE_CHAR) { // DoubleByte char | ||
| 123 | if (byteOff + inputSize >= inEnd) { | ||
| 124 | // split in the middle of a character | ||
| 125 | // save the first byte for next time around | ||
| 126 | savedByte = (byte) byte1; | ||
| 127 | byteOff += inputSize; | ||
| 128 | break; | ||
| 129 | } | ||
| 130 | |||
| 131 | byte1 &= 0xff; | ||
| 132 | byte2 = input[byteOff + inputSize] & 0xff; | ||
| 133 | |||
| 134 | inputSize++; | ||
| 135 | outputChar = getUnicode(byte1, byte2); | ||
| 136 | } | ||
| 137 | |||
| 138 | if (outputChar == REPLACE_CHAR) { | ||
| 139 | if (subMode) | ||
| 140 | outputChar = subChars[0]; | ||
| 141 | else { | ||
| 142 | badInputLength = inputSize; | ||
| 143 | throw new UnknownCharacterException(); | ||
| 144 | } | ||
| 145 | } | ||
| 146 | |||
| 147 | if (charOff >= outEnd) | ||
| 148 | throw new ConversionBufferFullException(); | ||
| 149 | |||
| 150 | output[charOff++] = outputChar; | ||
| 151 | byteOff += inputSize; | ||
| 152 | } | ||
| 153 | |||
| 154 | return charOff - outOff; | ||
| 155 | } | ||
| 156 | |||
| 157 | /** | ||
| 158 | * Resets the converter. | ||
| 159 | * Call this method to reset the converter to its initial state | ||
| 160 | */ | ||
| 161 | public void reset() { | ||
| 162 | byteOff = charOff = 0; | ||
| 163 | savedByte = 0; | ||
| 164 | } | ||
| 165 | |||
| 166 | |||
| 167 | /* | ||
| 168 | * Can be changed by subclass | ||
| 169 | */ | ||
| 170 | protected char convSingleByte(int b) { | ||
| 171 | if (b >= 0) | ||
| 172 | return (char) b; | ||
| 173 | return REPLACE_CHAR; | ||
| 174 | } | ||
| 175 | |||
| 176 | /* | ||
| 177 | * Can be changed by subclass | ||
| 178 | */ | ||
| 179 | protected char getUnicode(int byte1, int byte2) { | ||
| 180 | // Fix for bug 4117820 - similar fix for bug 4121358 put | ||
| 181 | // into ByteToCharEUC_JP.getUnicode() | ||
| 182 | if (((byte1 < 0) || (byte1 > index1.length)) | ||
| 183 | || ((byte2 < start) || (byte2 > end))) | ||
| 184 | return REPLACE_CHAR; | ||
| 185 | |||
| 186 | int n = (index1[byte1] & 0xf) * (end - start + 1) + (byte2 - start); | ||
| 187 | return index2[index1[byte1] >> 4].charAt(n); | ||
| 188 | } | ||
| 189 | |||
| 190 | protected final static char REPLACE_CHAR = '\uFFFD'; | ||
| 191 | } | ||