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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 1997, 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 | |||
| 28 | /** | ||
| 29 | * UCS2 (UTF16) -> UCS Transformation Format 8 (UTF-8) converter | ||
| 30 | * It's represented like below. | ||
| 31 | * | ||
| 32 | * # Bits Bit pattern | ||
| 33 | * 1 7 0xxxxxxx | ||
| 34 | * 2 11 110xxxxx 10xxxxxx | ||
| 35 | * 3 16 1110xxxx 10xxxxxx 10xxxxxx | ||
| 36 | * 4 21 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx | ||
| 37 | * 5 26 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx | ||
| 38 | * 6 31 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx | ||
| 39 | * | ||
| 40 | * UCS2 uses 1-3 / UTF16 uses 1-4 / UCS4 uses 1-6 | ||
| 41 | */ | ||
| 42 | |||
| 43 | public class CharToByteUTF8 extends CharToByteConverter { | ||
| 44 | |||
| 45 | private char highHalfZoneCode; | ||
| 46 | |||
| 47 | public int flush(byte[] output, int outStart, int outEnd) | ||
| 48 | throws MalformedInputException | ||
| 49 | { | ||
| 50 | if (highHalfZoneCode != 0) { | ||
| 51 | highHalfZoneCode = 0; | ||
| 52 | badInputLength = 0; | ||
| 53 | throw new MalformedInputException(); | ||
| 54 | } | ||
| 55 | byteOff = charOff = 0; | ||
| 56 | return 0; | ||
| 57 | } | ||
| 58 | |||
| 59 | /** | ||
| 60 | * Character conversion | ||
| 61 | */ | ||
| 62 | public int convert(char[] input, int inOff, int inEnd, | ||
| 63 | byte[] output, int outOff, int outEnd) | ||
| 64 | throws ConversionBufferFullException, MalformedInputException | ||
| 65 | { | ||
| 66 | char inputChar; | ||
| 67 | byte[] outputByte = new byte[6]; | ||
| 68 | int inputSize; | ||
| 69 | int outputSize; | ||
| 70 | |||
| 71 | charOff = inOff; | ||
| 72 | byteOff = outOff; | ||
| 73 | |||
| 74 | if (highHalfZoneCode != 0) { | ||
| 75 | inputChar = highHalfZoneCode; | ||
| 76 | highHalfZoneCode = 0; | ||
| 77 | if (input[inOff] >= 0xdc00 && input[inOff] <= 0xdfff) { | ||
| 78 | // This is legal UTF16 sequence. | ||
| 79 | int ucs4 = (highHalfZoneCode - 0xd800) * 0x400 | ||
| 80 | + (input[inOff] - 0xdc00) + 0x10000; | ||
| 81 | output[0] = (byte)(0xf0 | ((ucs4 >> 18)) & 0x07); | ||
| 82 | output[1] = (byte)(0x80 | ((ucs4 >> 12) & 0x3f)); | ||
| 83 | output[2] = (byte)(0x80 | ((ucs4 >> 6) & 0x3f)); | ||
| 84 | output[3] = (byte)(0x80 | (ucs4 & 0x3f)); | ||
| 85 | charOff++; | ||
| 86 | highHalfZoneCode = 0; | ||
| 87 | } else { | ||
| 88 | // This is illegal UTF16 sequence. | ||
| 89 | badInputLength = 0; | ||
| 90 | throw new MalformedInputException(); | ||
| 91 | } | ||
| 92 | } | ||
| 93 | |||
| 94 | while(charOff < inEnd) { | ||
| 95 | inputChar = input[charOff]; | ||
| 96 | if (inputChar < 0x80) { | ||
| 97 | outputByte[0] = (byte)inputChar; | ||
| 98 | inputSize = 1; | ||
| 99 | outputSize = 1; | ||
| 100 | } else if (inputChar < 0x800) { | ||
| 101 | outputByte[0] = (byte)(0xc0 | ((inputChar >> 6) & 0x1f)); | ||
| 102 | outputByte[1] = (byte)(0x80 | (inputChar & 0x3f)); | ||
| 103 | inputSize = 1; | ||
| 104 | outputSize = 2; | ||
| 105 | } else if (inputChar >= 0xd800 && inputChar <= 0xdbff) { | ||
| 106 | // this is <high-half zone code> in UTF-16 | ||
| 107 | if (charOff + 1 >= inEnd) { | ||
| 108 | highHalfZoneCode = inputChar; | ||
| 109 | break; | ||
| 110 | } | ||
| 111 | // check next char is valid <low-half zone code> | ||
| 112 | char lowChar = input[charOff + 1]; | ||
| 113 | if (lowChar < 0xdc00 || lowChar > 0xdfff) { | ||
| 114 | badInputLength = 1; | ||
| 115 | throw new MalformedInputException(); | ||
| 116 | } | ||
| 117 | int ucs4 = (inputChar - 0xd800) * 0x400 + (lowChar - 0xdc00) | ||
| 118 | + 0x10000; | ||
| 119 | outputByte[0] = (byte)(0xf0 | ((ucs4 >> 18)) & 0x07); | ||
| 120 | outputByte[1] = (byte)(0x80 | ((ucs4 >> 12) & 0x3f)); | ||
| 121 | outputByte[2] = (byte)(0x80 | ((ucs4 >> 6) & 0x3f)); | ||
| 122 | outputByte[3] = (byte)(0x80 | (ucs4 & 0x3f)); | ||
| 123 | outputSize = 4; | ||
| 124 | inputSize = 2; | ||
| 125 | } else { | ||
| 126 | outputByte[0] = (byte)(0xe0 | ((inputChar >> 12)) & 0x0f); | ||
| 127 | outputByte[1] = (byte)(0x80 | ((inputChar >> 6) & 0x3f)); | ||
| 128 | outputByte[2] = (byte)(0x80 | (inputChar & 0x3f)); | ||
| 129 | inputSize = 1; | ||
| 130 | outputSize = 3; | ||
| 131 | } | ||
| 132 | if (byteOff + outputSize > outEnd) { | ||
| 133 | throw new ConversionBufferFullException(); | ||
| 134 | } | ||
| 135 | for (int i = 0; i < outputSize; i++) { | ||
| 136 | output[byteOff++] = outputByte[i]; | ||
| 137 | } | ||
| 138 | charOff += inputSize; | ||
| 139 | } | ||
| 140 | return byteOff - outOff; | ||
| 141 | } | ||
| 142 | |||
| 143 | public boolean canConvert(char ch) { | ||
| 144 | return true; | ||
| 145 | } | ||
| 146 | |||
| 147 | public int getMaxBytesPerChar() { | ||
| 148 | return 3; | ||
| 149 | } | ||
| 150 | |||
| 151 | public void reset() { | ||
| 152 | byteOff = charOff = 0; | ||
| 153 | highHalfZoneCode = 0; | ||
| 154 | } | ||
| 155 | |||
| 156 | public String getCharacterEncoding() { | ||
| 157 | return "UTF8"; | ||
| 158 | } | ||
| 159 | } | ||