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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 2008, 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 | +import static sun.nio.cs.CharsetMapping.*; | |
| 29 | + | |
| 30 | +/** | |
| 31 | +* A table driven conversion from char to byte for single byte | |
| 32 | +* character sets. Tables will reside in the class CharToByteYYYYY, | |
| 33 | +* where YYYYY is a unique character set identifier | |
| 34 | + | |
| 35 | + < TBD: Tables are of the form... > | |
| 36 | + | |
| 37 | +* | |
| 38 | +* @author Lloyd Honomichl | |
| 39 | +* @author Asmus Freytag | |
| 40 | +* @version 8/28/96 | |
| 41 | +*/ | |
| 42 | + | |
| 43 | +public abstract class CharToByteSingleByte extends CharToByteConverter { | |
| 44 | + | |
| 45 | + /* | |
| 46 | + * 1st level index, provided by subclass | |
| 47 | + */ | |
| 48 | + protected char[] index1; | |
| 49 | + | |
| 50 | + /* | |
| 51 | + * 2nd level index, provided by subclass | |
| 52 | + */ | |
| 53 | + protected char[] index2; | |
| 54 | + | |
| 55 | + /* | |
| 56 | + * Mask to isolate bits for 1st level index, from subclass | |
| 57 | + */ | |
| 58 | + protected int mask1; | |
| 59 | + | |
| 60 | + /* | |
| 61 | + * Mask to isolate bits for 2nd level index, from subclass | |
| 62 | + */ | |
| 63 | + protected int mask2; | |
| 64 | + | |
| 65 | + /* | |
| 66 | + * Shift to isolate bits for 1st level index, from subclass | |
| 67 | + */ | |
| 68 | + protected int shift; | |
| 69 | + | |
| 70 | + private char highHalfZoneCode; | |
| 71 | + | |
| 72 | + public char[] getIndex1() { | |
| 73 | + return index1; | |
| 74 | + } | |
| 75 | + | |
| 76 | + public char[] getIndex2() { | |
| 77 | + return index2; | |
| 78 | + } | |
| 79 | + public int flush(byte[] output, int outStart, int outEnd) | |
| 80 | + throws MalformedInputException | |
| 81 | + { | |
| 82 | + if (highHalfZoneCode != 0) { | |
| 83 | + highHalfZoneCode = 0; | |
| 84 | + badInputLength = 0; | |
| 85 | + throw new MalformedInputException(); | |
| 86 | + } | |
| 87 | + byteOff = charOff = 0; | |
| 88 | + return 0; | |
| 89 | + } | |
| 90 | + | |
| 91 | + /** | |
| 92 | + * Converts characters to sequences of bytes. | |
| 93 | + * Conversions that result in Exceptions can be restarted by calling | |
| 94 | + * convert again, with appropriately modified parameters. | |
| 95 | + * @return the characters written to output. | |
| 96 | + * @param input char array containing text in Unicode | |
| 97 | + * @param inStart offset in input array | |
| 98 | + * @param inEnd offset of last byte to be converted | |
| 99 | + * @param output byte array to receive conversion result | |
| 100 | + * @param outStart starting offset | |
| 101 | + * @param outEnd offset of last byte to be written to | |
| 102 | + * @throw MalformedInputException for any sequence of chars that is | |
| 103 | + * illegal in Unicode (principally unpaired surrogates | |
| 104 | + * and \uFFFF or \uFFFE), including any partial surrogate pair | |
| 105 | + * which occurs at the end of an input buffer. | |
| 106 | + * @throw UnsupportedCharacterException for any character that | |
| 107 | + * that cannot be converted to the external character set. | |
| 108 | + */ | |
| 109 | + public int convert(char[] input, int inOff, int inEnd, | |
| 110 | + byte[] output, int outOff, int outEnd) | |
| 111 | + throws MalformedInputException, | |
| 112 | + UnknownCharacterException, | |
| 113 | + ConversionBufferFullException | |
| 114 | + { | |
| 115 | + char inputChar; // Input character to be converted | |
| 116 | + byte[] outputByte; // Output byte written to output | |
| 117 | + int inputSize; // Size of input | |
| 118 | + int outputSize; // Size of output | |
| 119 | + | |
| 120 | + byte[] tmpArray = new byte[1]; | |
| 121 | + | |
| 122 | + // Record beginning offsets | |
| 123 | + charOff = inOff; | |
| 124 | + byteOff = outOff; | |
| 125 | + | |
| 126 | + if (highHalfZoneCode != 0) { | |
| 127 | + inputChar = highHalfZoneCode; | |
| 128 | + highHalfZoneCode = 0; | |
| 129 | + if (input[inOff] >= 0xdc00 && input[inOff] <= 0xdfff) { | |
| 130 | + // This is legal UTF16 sequence. | |
| 131 | + badInputLength = 1; | |
| 132 | + throw new UnknownCharacterException(); | |
| 133 | + } else { | |
| 134 | + // This is illegal UTF16 sequence. | |
| 135 | + badInputLength = 0; | |
| 136 | + throw new MalformedInputException(); | |
| 137 | + } | |
| 138 | + } | |
| 139 | + | |
| 140 | + // Loop until we hit the end of the input | |
| 141 | + while(charOff < inEnd) { | |
| 142 | + | |
| 143 | + outputByte = tmpArray; | |
| 144 | + | |
| 145 | + // Get the input character | |
| 146 | + inputChar = input[charOff]; | |
| 147 | + | |
| 148 | + // Default output size | |
| 149 | + outputSize = 1; | |
| 150 | + | |
| 151 | + // Assume this is a simple character | |
| 152 | + inputSize = 1; | |
| 153 | + | |
| 154 | + // Is this a high surrogate? | |
| 155 | + if(inputChar >= '\uD800' && inputChar <= '\uDBFF') { | |
| 156 | + // Is this the last character in the input? | |
| 157 | + if (charOff + 1 >= inEnd) { | |
| 158 | + highHalfZoneCode = inputChar; | |
| 159 | + break; | |
| 160 | + } | |
| 161 | + | |
| 162 | + // Is there a low surrogate following? | |
| 163 | + inputChar = input[charOff + 1]; | |
| 164 | + if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') { | |
| 165 | + // We have a valid surrogate pair. Too bad we don't map | |
| 166 | + // surrogates. Is substitution enabled? | |
| 167 | + if (subMode) { | |
| 168 | + outputByte = subBytes; | |
| 169 | + outputSize = subBytes.length; | |
| 170 | + inputSize = 2; | |
| 171 | + } else { | |
| 172 | + badInputLength = 2; | |
| 173 | + throw new UnknownCharacterException(); | |
| 174 | + } | |
| 175 | + } else { | |
| 176 | + // We have a malformed surrogate pair | |
| 177 | + badInputLength = 1; | |
| 178 | + throw new MalformedInputException(); | |
| 179 | + } | |
| 180 | + } | |
| 181 | + | |
| 182 | + // Is this an unaccompanied low surrogate? | |
| 183 | + else if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') { | |
| 184 | + badInputLength = 1; | |
| 185 | + throw new MalformedInputException(); | |
| 186 | + } | |
| 187 | + | |
| 188 | + // Not part of a surrogate, so look it up | |
| 189 | + else { | |
| 190 | + // Get output using two level lookup | |
| 191 | + outputByte[0] = getNative(inputChar); | |
| 192 | + | |
| 193 | + // Might this character be unmappable? | |
| 194 | + if (outputByte[0] == 0) { | |
| 195 | + // If outputByte is zero because the input was zero | |
| 196 | + // then this character is actually mappable | |
| 197 | + if (input[charOff] != '\u0000') { | |
| 198 | + // We have an unmappable character | |
| 199 | + // Is substitution enabled? | |
| 200 | + if (subMode) { | |
| 201 | + outputByte = subBytes; | |
| 202 | + outputSize = subBytes.length; | |
| 203 | + } else { | |
| 204 | + badInputLength = 1; | |
| 205 | + throw new UnknownCharacterException(); | |
| 206 | + } | |
| 207 | + } | |
| 208 | + } | |
| 209 | + } | |
| 210 | + | |
| 211 | + // If we don't have room for the output, throw an exception | |
| 212 | + if (byteOff + outputSize > outEnd) | |
| 213 | + throw new ConversionBufferFullException(); | |
| 214 | + | |
| 215 | + // Put the byte in the output buffer | |
| 216 | + for (int i = 0; i < outputSize; i++) { | |
| 217 | + output[byteOff++] = outputByte[i]; | |
| 218 | + } | |
| 219 | + charOff += inputSize; | |
| 220 | + | |
| 221 | + } | |
| 222 | + | |
| 223 | + // Return the length written to the output buffer | |
| 224 | + return byteOff - outOff; | |
| 225 | + } | |
| 226 | + | |
| 227 | + /** | |
| 228 | + * the maximum number of bytes needed to hold a converted char | |
| 229 | + * @returns the maximum number of bytes needed for a converted char | |
| 230 | + */ | |
| 231 | + public int getMaxBytesPerChar() { | |
| 232 | + return 1; | |
| 233 | + } | |
| 234 | + | |
| 235 | + int encodeChar(char ch) { | |
| 236 | + char index = index1[ch >> 8]; | |
| 237 | + if (index == UNMAPPABLE_ENCODING) | |
| 238 | + return UNMAPPABLE_ENCODING; | |
| 239 | + return index2[index + (ch & 0xff)]; | |
| 240 | + } | |
| 241 | + | |
| 242 | + public byte getNative(char inputChar) { | |
| 243 | + int b = encodeChar(inputChar); | |
| 244 | + if (b == UNMAPPABLE_ENCODING) | |
| 245 | + return 0; | |
| 246 | + return (byte)b; | |
| 247 | + } | |
| 248 | + | |
| 249 | + /** | |
| 250 | + * Resets the converter. | |
| 251 | + * Call this method to reset the converter to its initial state | |
| 252 | + */ | |
| 253 | + public void reset() { | |
| 254 | + byteOff = charOff = 0; | |
| 255 | + highHalfZoneCode = 0; | |
| 256 | + } | |
| 257 | + | |
| 258 | + /** | |
| 259 | + * Return whether a character is mappable or not | |
| 260 | + * @return true if a character is mappable | |
| 261 | + */ | |
| 262 | + public boolean canConvert(char ch) { | |
| 263 | + return encodeChar(ch) != UNMAPPABLE_ENCODING; | |
| 264 | + } | |
| 265 | +} | |