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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 | +import sun.nio.cs.ext.DoubleByte; | |
| 28 | +import static sun.nio.cs.CharsetMapping.*; | |
| 29 | + | |
| 30 | +public abstract class ByteToCharEUC2 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 | + private DoubleByte.Decoder dec; | |
| 40 | + | |
| 41 | + public ByteToCharEUC2(DoubleByte.Decoder dec) { | |
| 42 | + super(); | |
| 43 | + state = G0; | |
| 44 | + this.dec = dec; | |
| 45 | + } | |
| 46 | + | |
| 47 | + char decodeSingle(int b) { | |
| 48 | + return dec.decodeSingle(b); | |
| 49 | + } | |
| 50 | + | |
| 51 | + char decodeDouble(int b1, int b2) { | |
| 52 | + return dec.decodeDouble(b1, b2); | |
| 53 | + } | |
| 54 | + | |
| 55 | + /** | |
| 56 | + * flush out any residual data and reset the buffer state | |
| 57 | + */ | |
| 58 | + public int flush(char[] output, int outStart, int outEnd) | |
| 59 | + throws MalformedInputException | |
| 60 | + { | |
| 61 | + if (state != G0) { | |
| 62 | + reset(); | |
| 63 | + badInputLength = 0; | |
| 64 | + throw new MalformedInputException(); | |
| 65 | + } | |
| 66 | + | |
| 67 | + reset(); | |
| 68 | + return 0; | |
| 69 | + } | |
| 70 | + | |
| 71 | + /** | |
| 72 | + * Resets the converter. | |
| 73 | + */ | |
| 74 | + public void reset() { | |
| 75 | + state = G0; | |
| 76 | + charOff = byteOff = 0; | |
| 77 | + } | |
| 78 | + | |
| 79 | + /** | |
| 80 | + * Character conversion | |
| 81 | + */ | |
| 82 | + public int convert(byte[] input, int inOff, int inEnd, | |
| 83 | + char[] output, int outOff, int outEnd) | |
| 84 | + throws UnknownCharacterException, MalformedInputException, | |
| 85 | + ConversionBufferFullException | |
| 86 | + { | |
| 87 | + int byte1; | |
| 88 | + char outputChar = UNMAPPABLE_DECODING; | |
| 89 | + byteOff = inOff; | |
| 90 | + charOff = outOff; | |
| 91 | + | |
| 92 | + while (byteOff < inEnd) { | |
| 93 | + byte1 = input[byteOff] & 0xff; | |
| 94 | + switch (state) { | |
| 95 | + case G0: | |
| 96 | + if (byte1 == SS2 || // no general support | |
| 97 | + byte1 == SS3 ) { // for g2 or g3 | |
| 98 | + badInputLength = 1; | |
| 99 | + throw new MalformedInputException(); | |
| 100 | + } | |
| 101 | + if ( byte1 <= 0x9f ) // < 0x9f has its own table | |
| 102 | + outputChar = decodeSingle(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 | + case G1: | |
| 113 | + state = G0; | |
| 114 | + if ( byte1 < 0xa1 || byte1 > 0xfe) { // valid G1 set second byte | |
| 115 | + badInputLength = 1; | |
| 116 | + throw new MalformedInputException(); | |
| 117 | + } | |
| 118 | + outputChar = decodeDouble(firstByte, byte1); | |
| 119 | + break; | |
| 120 | + } | |
| 121 | + if (state == G0) { | |
| 122 | + if (outputChar == UNMAPPABLE_DECODING) { | |
| 123 | + if (subMode) | |
| 124 | + outputChar = subChars[0]; | |
| 125 | + else { | |
| 126 | + badInputLength = 1; | |
| 127 | + throw new UnknownCharacterException(); | |
| 128 | + } | |
| 129 | + } | |
| 130 | + if (charOff >= outEnd) | |
| 131 | + throw new ConversionBufferFullException(); | |
| 132 | + output[charOff++] = outputChar; | |
| 133 | + } | |
| 134 | + byteOff++; | |
| 135 | + } | |
| 136 | + return charOff - outOff; | |
| 137 | + } | |
| 138 | +} | |