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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 2010, 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 CharToByteDBCS_ASCII extends CharToByteConverter | ||
| 31 | { | ||
| 32 | |||
| 33 | private char highHalfZoneCode; | ||
| 34 | private byte[] outputByte = new byte[2]; | ||
| 35 | |||
| 36 | private DoubleByte.Encoder enc; | ||
| 37 | |||
| 38 | public CharToByteDBCS_ASCII(DoubleByte.Encoder enc) { | ||
| 39 | super(); | ||
| 40 | this.enc = enc; | ||
| 41 | } | ||
| 42 | |||
| 43 | int encodeChar(char c) { | ||
| 44 | return enc.encodeChar(c); | ||
| 45 | } | ||
| 46 | |||
| 47 | /** | ||
| 48 | * flush out any residual data and reset the buffer state | ||
| 49 | */ | ||
| 50 | public int flush(byte [] output, int outStart, int outEnd) | ||
| 51 | throws MalformedInputException, ConversionBufferFullException | ||
| 52 | { | ||
| 53 | |||
| 54 | if (highHalfZoneCode != 0) { | ||
| 55 | reset(); | ||
| 56 | badInputLength = 0; | ||
| 57 | throw new MalformedInputException(); | ||
| 58 | } | ||
| 59 | |||
| 60 | reset(); | ||
| 61 | return 0; | ||
| 62 | } | ||
| 63 | |||
| 64 | /** | ||
| 65 | * Character conversion | ||
| 66 | */ | ||
| 67 | public int convert(char[] input, int inOff, int inEnd, | ||
| 68 | byte[] output, int outOff, int outEnd) | ||
| 69 | throws UnknownCharacterException, MalformedInputException, | ||
| 70 | ConversionBufferFullException | ||
| 71 | { | ||
| 72 | char inputChar; | ||
| 73 | int inputSize; | ||
| 74 | |||
| 75 | byteOff = outOff; | ||
| 76 | charOff = inOff; | ||
| 77 | |||
| 78 | while(charOff < inEnd) { | ||
| 79 | int index; | ||
| 80 | int theBytes; | ||
| 81 | int spaceNeeded; | ||
| 82 | |||
| 83 | if (highHalfZoneCode == 0) { | ||
| 84 | inputChar = input[charOff]; | ||
| 85 | inputSize = 1; | ||
| 86 | } else { | ||
| 87 | inputChar = highHalfZoneCode; | ||
| 88 | inputSize = 0; | ||
| 89 | highHalfZoneCode = 0; | ||
| 90 | } | ||
| 91 | |||
| 92 | // Is this a high surrogate? | ||
| 93 | if (Character.isHighSurrogate(inputChar)) { | ||
| 94 | // Is this the last character of the input? | ||
| 95 | if (charOff + inputSize >= inEnd) { | ||
| 96 | highHalfZoneCode = inputChar; | ||
| 97 | charOff += inputSize; | ||
| 98 | break; | ||
| 99 | } | ||
| 100 | |||
| 101 | // Is there a low surrogate following? | ||
| 102 | inputChar = input[charOff + inputSize]; | ||
| 103 | if (Character.isLowSurrogate(inputChar)) { | ||
| 104 | // We have a valid surrogate pair. Too bad we don't do | ||
| 105 | // surrogates. Is substitution enabled? | ||
| 106 | if (subMode) { | ||
| 107 | if (subBytes.length == 1) { | ||
| 108 | outputByte[0] = 0x00; | ||
| 109 | outputByte[1] = subBytes[0]; | ||
| 110 | } | ||
| 111 | else { | ||
| 112 | outputByte[0] = subBytes[0]; | ||
| 113 | outputByte[1] = subBytes[1]; | ||
| 114 | } | ||
| 115 | inputSize++; | ||
| 116 | } else { | ||
| 117 | badInputLength = 2; | ||
| 118 | throw new UnknownCharacterException(); | ||
| 119 | } | ||
| 120 | } else { | ||
| 121 | // We have a malformed surrogate pair | ||
| 122 | badInputLength = 1; | ||
| 123 | throw new MalformedInputException(); | ||
| 124 | } | ||
| 125 | } | ||
| 126 | // Is this an unaccompanied low surrogate? | ||
| 127 | else if (Character.isLowSurrogate(inputChar)) { | ||
| 128 | badInputLength = 1; | ||
| 129 | throw new MalformedInputException(); | ||
| 130 | } else { | ||
| 131 | |||
| 132 | // We have a valid character, get the bytes for it | ||
| 133 | theBytes = encodeChar(inputChar); | ||
| 134 | if (theBytes == UNMAPPABLE_ENCODING) { | ||
| 135 | // if there was no mapping - look for substitution characters | ||
| 136 | if (subMode) { | ||
| 137 | if (subBytes.length == 1) { | ||
| 138 | outputByte[0] = 0x00; | ||
| 139 | outputByte[1] = subBytes[0]; | ||
| 140 | } else { | ||
| 141 | outputByte[0] = subBytes[0]; | ||
| 142 | outputByte[1] = subBytes[1]; | ||
| 143 | } | ||
| 144 | } else { | ||
| 145 | badInputLength = 1; | ||
| 146 | throw new UnknownCharacterException(); | ||
| 147 | } | ||
| 148 | } else { | ||
| 149 | outputByte[0] = (byte)(theBytes >>8); | ||
| 150 | outputByte[1] = (byte)theBytes; | ||
| 151 | } | ||
| 152 | } | ||
| 153 | if (outputByte[0] == 0x00) | ||
| 154 | spaceNeeded = 1; | ||
| 155 | else | ||
| 156 | spaceNeeded = 2; | ||
| 157 | |||
| 158 | if (byteOff + spaceNeeded > outEnd) | ||
| 159 | throw new ConversionBufferFullException(); | ||
| 160 | |||
| 161 | if (spaceNeeded == 1) | ||
| 162 | output[byteOff++] = outputByte[1]; | ||
| 163 | else { | ||
| 164 | output[byteOff++] = outputByte[0]; | ||
| 165 | output[byteOff++] = outputByte[1]; | ||
| 166 | } | ||
| 167 | |||
| 168 | charOff += inputSize; | ||
| 169 | } | ||
| 170 | return byteOff - outOff; | ||
| 171 | } | ||
| 172 | |||
| 173 | /** | ||
| 174 | * Resets converter to its initial state. | ||
| 175 | */ | ||
| 176 | public void reset() { | ||
| 177 | charOff = byteOff = 0; | ||
| 178 | highHalfZoneCode = 0; | ||
| 179 | } | ||
| 180 | |||
| 181 | /** | ||
| 182 | * Returns the maximum number of bytes needed to convert a char. | ||
| 183 | */ | ||
| 184 | public int getMaxBytesPerChar() { | ||
| 185 | return 2; | ||
| 186 | } | ||
| 187 | |||
| 188 | /** | ||
| 189 | * Returns true if the given character can be converted to the | ||
| 190 | * target character encoding. | ||
| 191 | */ | ||
| 192 | public boolean canConvert(char c) { | ||
| 193 | return encodeChar(c) != UNMAPPABLE_ENCODING; | ||
| 194 | } | ||
| 195 | } | ||