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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 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 | * A table driven conversion from byte to char for single byte character sets. | ||
| 30 | * The needed data tables will reside in a character set specific subclass. | ||
| 31 | * | ||
| 32 | * @author Lloyd Honomichl | ||
| 33 | * @author Asmus Freytag | ||
| 34 | */ | ||
| 35 | public abstract class ByteToCharSingleByte extends ByteToCharConverter { | ||
| 36 | |||
| 37 | /** | ||
| 38 | * Mapping table. Values supplied by subclass | ||
| 39 | */ | ||
| 40 | protected String byteToCharTable; | ||
| 41 | |||
| 42 | public String getByteToCharTable() { | ||
| 43 | return byteToCharTable; | ||
| 44 | } | ||
| 45 | |||
| 46 | public int flush(char[] output, int outStart, int outEnd) { | ||
| 47 | byteOff = charOff = 0; | ||
| 48 | return 0; | ||
| 49 | } | ||
| 50 | |||
| 51 | /** | ||
| 52 | * Converts bytes to characters according to the selected character | ||
| 53 | * encoding. | ||
| 54 | * Maintains internal state, so that conversions that result in | ||
| 55 | * exceptions can be restarted by calling convert again, with | ||
| 56 | * appropriately modified parameters. | ||
| 57 | * Call reset before converting input that is not a continuation of | ||
| 58 | * the previous call. | ||
| 59 | * @return the number of characters written to output. | ||
| 60 | * @param input byte array containing text in character set | ||
| 61 | * @param inStart offset in input array | ||
| 62 | * @param inEnd offset of last byte to be converted | ||
| 63 | * @param output character array to receive conversion result | ||
| 64 | * @param outStart starting offset | ||
| 65 | * @param outEnd offset of last character to be written to | ||
| 66 | * @throw MalformedInputException for any sequence of bytes that is | ||
| 67 | * illegal for the input character set, including any partial multi-byte | ||
| 68 | * sequence which occurs at the end of an input buffer. | ||
| 69 | * @throw UnsupportedCharacterException for any sequence of bytes that | ||
| 70 | * contain a character not supported in the current conversion. | ||
| 71 | * @throw BufferFullException whenever the output buffer is full | ||
| 72 | * before the input is exhausted. | ||
| 73 | * @see #reset | ||
| 74 | */ | ||
| 75 | public int convert(byte[] input, int inOff, int inEnd, | ||
| 76 | char[] output, int outOff, int outEnd) | ||
| 77 | throws UnknownCharacterException, | ||
| 78 | MalformedInputException, | ||
| 79 | ConversionBufferFullException | ||
| 80 | { | ||
| 81 | char outputChar; | ||
| 82 | int byteIndex; | ||
| 83 | |||
| 84 | charOff = outOff; | ||
| 85 | byteOff = inOff; | ||
| 86 | |||
| 87 | // Loop until we hit the end of the input | ||
| 88 | while(byteOff < inEnd) { | ||
| 89 | |||
| 90 | byteIndex = input[byteOff]; | ||
| 91 | |||
| 92 | /* old source | ||
| 93 | *outputChar = byteToCharTable[input[byteOff] + 128]; | ||
| 94 | */ | ||
| 95 | // Lookup the output character | ||
| 96 | outputChar = getUnicode(byteIndex); | ||
| 97 | |||
| 98 | // Is the output unmappable? | ||
| 99 | if (outputChar == '\uFFFD') { | ||
| 100 | if (subMode) { | ||
| 101 | outputChar = subChars[0]; | ||
| 102 | } else { | ||
| 103 | badInputLength = 1; | ||
| 104 | throw new UnknownCharacterException(); | ||
| 105 | } | ||
| 106 | } | ||
| 107 | |||
| 108 | // If we don't have room for the output, throw an exception | ||
| 109 | if (charOff >= outEnd) | ||
| 110 | throw new ConversionBufferFullException(); | ||
| 111 | |||
| 112 | // Put the character in the output buffer | ||
| 113 | output[charOff]= outputChar; | ||
| 114 | charOff++; | ||
| 115 | byteOff++; | ||
| 116 | } | ||
| 117 | |||
| 118 | // Return the length written to the output buffer | ||
| 119 | return charOff-outOff; | ||
| 120 | } | ||
| 121 | |||
| 122 | protected char getUnicode(int byteIndex) { | ||
| 123 | int n = byteIndex + 128; | ||
| 124 | if (n >= byteToCharTable.length() || n < 0) | ||
| 125 | return '\uFFFD'; | ||
| 126 | return byteToCharTable.charAt(n); | ||
| 127 | } | ||
| 128 | |||
| 129 | /** | ||
| 130 | * Resets the converter. | ||
| 131 | * Call this method to reset the converter to its initial state | ||
| 132 | */ | ||
| 133 | public void reset() { | ||
| 134 | byteOff = charOff = 0; | ||
| 135 | } | ||
| 136 | |||
| 137 | } | ||