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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 | +} | |