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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 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 | /** | ||
| 28 | * @author Malcolm Ayres | ||
| 29 | */ | ||
| 30 | public abstract class ByteToCharEUC extends ByteToCharConverter | ||
| 31 | { | ||
| 32 | private final int G0 = 0; | ||
| 33 | private final int G1 = 1; | ||
| 34 | private final int SS2 = 0x8E; | ||
| 35 | private final int SS3 = 0x8F; | ||
| 36 | |||
| 37 | private int firstByte, state; | ||
| 38 | |||
| 39 | protected String mappingTableG1; | ||
| 40 | protected String byteToCharTable; | ||
| 41 | |||
| 42 | |||
| 43 | public ByteToCharEUC() { | ||
| 44 | super(); | ||
| 45 | state = G0; | ||
| 46 | } | ||
| 47 | |||
| 48 | /** | ||
| 49 | * flush out any residual data and reset the buffer state | ||
| 50 | */ | ||
| 51 | public int flush(char[] output, int outStart, int outEnd) | ||
| 52 | throws MalformedInputException | ||
| 53 | { | ||
| 54 | if (state != G0) { | ||
| 55 | reset(); | ||
| 56 | badInputLength = 0; | ||
| 57 | throw new MalformedInputException(); | ||
| 58 | } | ||
| 59 | |||
| 60 | reset(); | ||
| 61 | return 0; | ||
| 62 | } | ||
| 63 | |||
| 64 | /** | ||
| 65 | * Resets the converter. | ||
| 66 | */ | ||
| 67 | public void reset() { | ||
| 68 | state = G0; | ||
| 69 | charOff = byteOff = 0; | ||
| 70 | } | ||
| 71 | |||
| 72 | /** | ||
| 73 | * Character conversion | ||
| 74 | */ | ||
| 75 | public int convert(byte[] input, int inOff, int inEnd, | ||
| 76 | char[] output, int outOff, int outEnd) | ||
| 77 | throws UnknownCharacterException, MalformedInputException, | ||
| 78 | ConversionBufferFullException | ||
| 79 | { | ||
| 80 | |||
| 81 | int byte1; | ||
| 82 | char outputChar = '\uFFFD'; | ||
| 83 | |||
| 84 | byteOff = inOff; | ||
| 85 | charOff = outOff; | ||
| 86 | |||
| 87 | while (byteOff < inEnd) { | ||
| 88 | |||
| 89 | byte1 = input[byteOff]; | ||
| 90 | if (byte1 < 0) | ||
| 91 | byte1 += 256; | ||
| 92 | |||
| 93 | switch (state) { | ||
| 94 | case G0: | ||
| 95 | if (byte1 == SS2 || // no general support | ||
| 96 | byte1 == SS3 ) { // for g2 or g3 | ||
| 97 | badInputLength = 1; | ||
| 98 | throw new MalformedInputException(); | ||
| 99 | } | ||
| 100 | |||
| 101 | if ( byte1 <= 0x9f ) // < 0x9f has its own table | ||
| 102 | outputChar = byteToCharTable.charAt(byte1); | ||
| 103 | else | ||
| 104 | if (byte1 < 0xa1 || byte1 > 0xfe) { // byte within range? | ||
| 105 | badInputLength = 1; | ||
| 106 | throw new MalformedInputException(); | ||
| 107 | } else { // G1 set first byte | ||
| 108 | firstByte = byte1; | ||
| 109 | state = G1; | ||
| 110 | } | ||
| 111 | break; | ||
| 112 | |||
| 113 | case G1: | ||
| 114 | |||
| 115 | state = G0; | ||
| 116 | if ( byte1 < 0xa1 || byte1 > 0xfe) { // valid G1 set second byte | ||
| 117 | badInputLength = 1; | ||
| 118 | throw new MalformedInputException(); | ||
| 119 | } | ||
| 120 | |||
| 121 | outputChar = mappingTableG1.charAt(((firstByte - 0xa1) * 94) + byte1 - 0xa1); | ||
| 122 | break; | ||
| 123 | |||
| 124 | } | ||
| 125 | |||
| 126 | if (state == G0) { | ||
| 127 | if (outputChar == '\uFFFD') { | ||
| 128 | if (subMode) | ||
| 129 | outputChar = subChars[0]; | ||
| 130 | else { | ||
| 131 | badInputLength = 1; | ||
| 132 | throw new UnknownCharacterException(); | ||
| 133 | } | ||
| 134 | } | ||
| 135 | |||
| 136 | if (charOff >= outEnd) | ||
| 137 | throw new ConversionBufferFullException(); | ||
| 138 | |||
| 139 | output[charOff++] = outputChar; | ||
| 140 | } | ||
| 141 | |||
| 142 | byteOff++; | ||
| 143 | |||
| 144 | } | ||
| 145 | |||
| 146 | return charOff - outOff; | ||
| 147 | |||
| 148 | } | ||
| 149 | |||
| 150 | } | ||