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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 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 | * @author Limin Shi | ||
| 30 | */ | ||
| 31 | |||
| 32 | public abstract class CharToByteDoubleByte extends CharToByteConverter { | ||
| 33 | |||
| 34 | /* | ||
| 35 | * 1st level index, provided by subclass | ||
| 36 | */ | ||
| 37 | protected short index1[]; | ||
| 38 | |||
| 39 | /* | ||
| 40 | * 2nd level index, provided by subclass | ||
| 41 | */ | ||
| 42 | protected String index2[]; | ||
| 43 | |||
| 44 | protected char highHalfZoneCode; | ||
| 45 | |||
| 46 | public short[] getIndex1() { | ||
| 47 | return index1; | ||
| 48 | } | ||
| 49 | |||
| 50 | public String[] getIndex2() { | ||
| 51 | return index2; | ||
| 52 | } | ||
| 53 | |||
| 54 | public int flush(byte[] output, int outStart, int outEnd) | ||
| 55 | throws MalformedInputException, ConversionBufferFullException | ||
| 56 | { | ||
| 57 | if (highHalfZoneCode != 0) { | ||
| 58 | highHalfZoneCode = 0; | ||
| 59 | badInputLength = 0; | ||
| 60 | throw new MalformedInputException(); | ||
| 61 | } | ||
| 62 | byteOff = charOff = 0; | ||
| 63 | return 0; | ||
| 64 | } | ||
| 65 | |||
| 66 | /** | ||
| 67 | * Converts characters to sequences of bytes. | ||
| 68 | * Conversions that result in Exceptions can be restarted by calling | ||
| 69 | * convert again, with appropriately modified parameters. | ||
| 70 | * @return the characters written to output. | ||
| 71 | * @param input char array containing text in Unicode | ||
| 72 | * @param inStart offset in input array | ||
| 73 | * @param inEnd offset of last byte to be converted | ||
| 74 | * @param output byte array to receive conversion result | ||
| 75 | * @param outStart starting offset | ||
| 76 | * @param outEnd offset of last byte to be written to | ||
| 77 | * @throw UnsupportedCharacterException for any character | ||
| 78 | * that cannot be converted to the external character set. | ||
| 79 | */ | ||
| 80 | public int convert(char[] input, int inOff, int inEnd, | ||
| 81 | byte[] output, int outOff, int outEnd) | ||
| 82 | throws MalformedInputException, UnknownCharacterException, | ||
| 83 | ConversionBufferFullException | ||
| 84 | { | ||
| 85 | char inputChar; // Input character to be converted | ||
| 86 | byte[] outputByte; // Output byte written to output | ||
| 87 | int inputSize = 0; // Size of input | ||
| 88 | int outputSize = 0; // Size of output | ||
| 89 | byte[] tmpbuf = new byte[2]; | ||
| 90 | |||
| 91 | // Record beginning offsets | ||
| 92 | charOff = inOff; | ||
| 93 | byteOff = outOff; | ||
| 94 | |||
| 95 | if (highHalfZoneCode != 0) { | ||
| 96 | inputChar = highHalfZoneCode; | ||
| 97 | highHalfZoneCode = 0; | ||
| 98 | if (input[inOff] >= 0xdc00 && input[inOff] <= 0xdfff) { | ||
| 99 | // This is legal UTF16 sequence. | ||
| 100 | badInputLength = 1; | ||
| 101 | throw new UnknownCharacterException(); | ||
| 102 | } else { | ||
| 103 | // This is illegal UTF16 sequence. | ||
| 104 | badInputLength = 0; | ||
| 105 | throw new MalformedInputException(); | ||
| 106 | } | ||
| 107 | } | ||
| 108 | |||
| 109 | // Loop until we hit the end of the input | ||
| 110 | while(charOff < inEnd) { | ||
| 111 | inputSize = 1; | ||
| 112 | outputByte = tmpbuf; | ||
| 113 | inputChar = input[charOff]; // Get the input character | ||
| 114 | |||
| 115 | // Is this a high surrogate? | ||
| 116 | if(inputChar >= '\uD800' && inputChar <= '\uDBFF') { | ||
| 117 | // Is this the last character of the input? | ||
| 118 | if (charOff + 1 >= inEnd) { | ||
| 119 | highHalfZoneCode = inputChar; | ||
| 120 | break; | ||
| 121 | } | ||
| 122 | |||
| 123 | // Is there a low surrogate following? | ||
| 124 | inputChar = input[charOff + 1]; | ||
| 125 | if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') { | ||
| 126 | // We have a valid surrogate pair. Too bad we don't do | ||
| 127 | // surrogates. Is substitution enabled? | ||
| 128 | if (subMode) { | ||
| 129 | outputByte = subBytes; | ||
| 130 | outputSize = subBytes.length; | ||
| 131 | inputSize = 2; | ||
| 132 | } else { | ||
| 133 | badInputLength = 2; | ||
| 134 | throw new UnknownCharacterException(); | ||
| 135 | } | ||
| 136 | } else { | ||
| 137 | // We have a malformed surrogate pair | ||
| 138 | badInputLength = 1; | ||
| 139 | throw new MalformedInputException(); | ||
| 140 | } | ||
| 141 | } | ||
| 142 | // Is this an unaccompanied low surrogate? | ||
| 143 | else if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') { | ||
| 144 | badInputLength = 1; | ||
| 145 | throw new MalformedInputException(); | ||
| 146 | } else { | ||
| 147 | outputSize = convSingleByte(inputChar, outputByte); | ||
| 148 | if (outputSize == 0) { // DoubleByte | ||
| 149 | int ncode = getNative(inputChar); | ||
| 150 | if (ncode != 0 ) { | ||
| 151 | outputByte[0] = (byte) ((ncode & 0xff00) >> 8); | ||
| 152 | outputByte[1] = (byte) (ncode & 0xff); | ||
| 153 | outputSize = 2; | ||
| 154 | } else { | ||
| 155 | if (subMode) { | ||
| 156 | outputByte = subBytes; | ||
| 157 | outputSize = subBytes.length; | ||
| 158 | } else { | ||
| 159 | badInputLength = 1; | ||
| 160 | throw new UnknownCharacterException(); | ||
| 161 | } | ||
| 162 | } | ||
| 163 | } | ||
| 164 | } | ||
| 165 | |||
| 166 | // If we don't have room for the output, throw an exception | ||
| 167 | if (byteOff + outputSize > outEnd) | ||
| 168 | throw new ConversionBufferFullException(); | ||
| 169 | |||
| 170 | // Put the byte in the output buffer | ||
| 171 | for (int i = 0; i < outputSize; i++) { | ||
| 172 | output[byteOff++] = outputByte[i]; | ||
| 173 | } | ||
| 174 | charOff += inputSize; | ||
| 175 | } | ||
| 176 | // Return the length written to the output buffer | ||
| 177 | return byteOff - outOff; | ||
| 178 | } | ||
| 179 | |||
| 180 | |||
| 181 | /** | ||
| 182 | * the maximum number of bytes needed to hold a converted char | ||
| 183 | * @returns the maximum number of bytes needed for a converted char | ||
| 184 | */ | ||
| 185 | public int getMaxBytesPerChar() { | ||
| 186 | return 2; | ||
| 187 | } | ||
| 188 | |||
| 189 | /** | ||
| 190 | * Resets the converter. | ||
| 191 | * Call this method to reset the converter to its initial state | ||
| 192 | */ | ||
| 193 | public void reset() { | ||
| 194 | byteOff = charOff = 0; | ||
| 195 | highHalfZoneCode = 0; | ||
| 196 | } | ||
| 197 | |||
| 198 | /** | ||
| 199 | * Return whether a character is mappable or not | ||
| 200 | * @return true if a character is mappable | ||
| 201 | */ | ||
| 202 | public boolean canConvert(char ch) { | ||
| 203 | byte[] outByte = new byte[2]; | ||
| 204 | |||
| 205 | if ((ch == (char) 0) || (convSingleByte(ch, outByte) != 0)) | ||
| 206 | return true; | ||
| 207 | if (this.getNative(ch) != 0) | ||
| 208 | return true; | ||
| 209 | return false; | ||
| 210 | } | ||
| 211 | |||
| 212 | |||
| 213 | /* | ||
| 214 | * Can be changed by subclass | ||
| 215 | */ | ||
| 216 | protected int convSingleByte(char inputChar, byte[] outputByte) { | ||
| 217 | if (inputChar < 0x80) { | ||
| 218 | outputByte[0] = (byte)(inputChar & 0x7f); | ||
| 219 | return 1; | ||
| 220 | } | ||
| 221 | return 0; | ||
| 222 | } | ||
| 223 | |||
| 224 | /* | ||
| 225 | * Can be changed by subclass | ||
| 226 | */ | ||
| 227 | protected int getNative(char ch) { | ||
| 228 | int offset = index1[((ch & 0xff00) >> 8 )] << 8; | ||
| 229 | return index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff)); | ||
| 230 | } | ||
| 231 | |||
| 232 | } | ||