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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 | +} | |