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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 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 | |||
| 28 | /** | ||
| 29 | * UCS Transformation Format 8 (UTF-8) -> UCS2 (UTF16) converter | ||
| 30 | * | ||
| 31 | * see CharToByteUTF8.java about UTF-8 format | ||
| 32 | */ | ||
| 33 | |||
| 34 | public class ByteToCharUTF8 extends ByteToCharConverter { | ||
| 35 | |||
| 36 | private int savedSize; | ||
| 37 | private byte[] savedBytes; | ||
| 38 | |||
| 39 | public ByteToCharUTF8() { | ||
| 40 | super(); | ||
| 41 | savedSize = 0; | ||
| 42 | savedBytes = new byte[5]; | ||
| 43 | } | ||
| 44 | |||
| 45 | public int flush(char[] output, int outStart, int outEnd) | ||
| 46 | throws MalformedInputException | ||
| 47 | { | ||
| 48 | if (savedSize != 0) { | ||
| 49 | savedSize = 0; | ||
| 50 | badInputLength = 0; | ||
| 51 | throw new MalformedInputException(); | ||
| 52 | } | ||
| 53 | byteOff = charOff = 0; | ||
| 54 | return 0; | ||
| 55 | } | ||
| 56 | |||
| 57 | /** | ||
| 58 | * Character converson | ||
| 59 | */ | ||
| 60 | public int convert(byte[] input, int inOff, int inEnd, | ||
| 61 | char[] output, int outOff, int outEnd) | ||
| 62 | throws MalformedInputException, ConversionBufferFullException | ||
| 63 | { | ||
| 64 | int byte1, byte2, byte3, byte4; | ||
| 65 | char[] outputChar = new char[2]; | ||
| 66 | int outputSize; | ||
| 67 | int byteOffAdjustment = 0; | ||
| 68 | |||
| 69 | if (savedSize != 0) { | ||
| 70 | byte[] newBuf; | ||
| 71 | newBuf = new byte[inEnd - inOff + savedSize]; | ||
| 72 | for (int i = 0; i < savedSize; i++) { | ||
| 73 | newBuf[i] = savedBytes[i]; | ||
| 74 | } | ||
| 75 | System.arraycopy(input, inOff, newBuf, savedSize, inEnd - inOff); | ||
| 76 | input = newBuf; | ||
| 77 | inOff = 0; | ||
| 78 | inEnd = newBuf.length; | ||
| 79 | byteOffAdjustment = -savedSize; | ||
| 80 | savedSize = 0; | ||
| 81 | } | ||
| 82 | |||
| 83 | charOff = outOff; | ||
| 84 | byteOff = inOff; | ||
| 85 | int startByteOff; | ||
| 86 | |||
| 87 | while(byteOff < inEnd) { | ||
| 88 | |||
| 89 | startByteOff = byteOff; | ||
| 90 | byte1 = input[byteOff++] & 0xff; | ||
| 91 | |||
| 92 | if ((byte1 & 0x80) == 0){ | ||
| 93 | outputChar[0] = (char)byte1; | ||
| 94 | outputSize = 1; | ||
| 95 | } else if ((byte1 & 0xe0) == 0xc0) { | ||
| 96 | if (byteOff >= inEnd) { | ||
| 97 | savedSize = 1; | ||
| 98 | savedBytes[0] = (byte)byte1; | ||
| 99 | break; | ||
| 100 | } | ||
| 101 | byte2 = input[byteOff++] & 0xff; | ||
| 102 | if ((byte2 & 0xc0) != 0x80) { | ||
| 103 | badInputLength = 2; | ||
| 104 | byteOff += byteOffAdjustment; | ||
| 105 | throw new MalformedInputException(); | ||
| 106 | } | ||
| 107 | outputChar[0] = (char)(((byte1 & 0x1f) << 6) | (byte2 & 0x3f)); | ||
| 108 | outputSize = 1; | ||
| 109 | } else if ((byte1 & 0xf0) == 0xe0){ | ||
| 110 | if (byteOff + 1 >= inEnd) { | ||
| 111 | savedBytes[0] = (byte)byte1; | ||
| 112 | if (byteOff >= inEnd) { | ||
| 113 | savedSize = 1; | ||
| 114 | } else { | ||
| 115 | savedSize = 2; | ||
| 116 | savedBytes[1] = input[byteOff++]; | ||
| 117 | } | ||
| 118 | break; | ||
| 119 | } | ||
| 120 | byte2 = input[byteOff++] & 0xff; | ||
| 121 | byte3 = input[byteOff++] & 0xff; | ||
| 122 | if ((byte2 & 0xc0) != 0x80 || (byte3 & 0xc0) != 0x80) { | ||
| 123 | badInputLength = 3; | ||
| 124 | byteOff += byteOffAdjustment; | ||
| 125 | throw new MalformedInputException(); | ||
| 126 | } | ||
| 127 | outputChar[0] = (char)(((byte1 & 0x0f) << 12) | ||
| 128 | | ((byte2 & 0x3f) << 6) | ||
| 129 | | (byte3 & 0x3f)); | ||
| 130 | outputSize = 1; | ||
| 131 | } else if ((byte1 & 0xf8) == 0xf0) { | ||
| 132 | if (byteOff + 2 >= inEnd) { | ||
| 133 | savedBytes[0] = (byte)byte1; | ||
| 134 | if (byteOff >= inEnd) { | ||
| 135 | savedSize = 1; | ||
| 136 | } else if (byteOff + 1 >= inEnd) { | ||
| 137 | savedSize = 2; | ||
| 138 | savedBytes[1] = input[byteOff++]; | ||
| 139 | } else { | ||
| 140 | savedSize = 3; | ||
| 141 | savedBytes[1] = input[byteOff++]; | ||
| 142 | savedBytes[2] = input[byteOff++]; | ||
| 143 | } | ||
| 144 | break; | ||
| 145 | } | ||
| 146 | byte2 = input[byteOff++] & 0xff; | ||
| 147 | byte3 = input[byteOff++] & 0xff; | ||
| 148 | byte4 = input[byteOff++] & 0xff; | ||
| 149 | if ((byte2 & 0xc0) != 0x80 || | ||
| 150 | (byte3 & 0xc0) != 0x80 || | ||
| 151 | (byte4 & 0xc0) != 0x80) { | ||
| 152 | badInputLength = 4; | ||
| 153 | byteOff += byteOffAdjustment; | ||
| 154 | throw new MalformedInputException(); | ||
| 155 | } | ||
| 156 | // this byte sequence is UTF16 character | ||
| 157 | int ucs4 = (0x07 & byte1) << 18 | | ||
| 158 | (0x3f & byte2) << 12 | | ||
| 159 | (0x3f & byte3) << 6 | | ||
| 160 | (0x3f & byte4); | ||
| 161 | outputChar[0] = (char)((ucs4 - 0x10000) / 0x400 + 0xd800); | ||
| 162 | outputChar[1] = (char)((ucs4 - 0x10000) % 0x400 + 0xdc00); | ||
| 163 | outputSize = 2; | ||
| 164 | } else { | ||
| 165 | badInputLength = 1; | ||
| 166 | byteOff += byteOffAdjustment; | ||
| 167 | throw new MalformedInputException(); | ||
| 168 | } | ||
| 169 | |||
| 170 | if (charOff + outputSize > outEnd) { | ||
| 171 | byteOff = startByteOff; | ||
| 172 | byteOff += byteOffAdjustment; | ||
| 173 | throw new ConversionBufferFullException(); | ||
| 174 | } | ||
| 175 | |||
| 176 | for (int i = 0; i < outputSize; i++) { | ||
| 177 | output[charOff + i] = outputChar[i]; | ||
| 178 | } | ||
| 179 | charOff += outputSize; | ||
| 180 | } | ||
| 181 | |||
| 182 | byteOff += byteOffAdjustment; | ||
| 183 | return charOff - outOff; | ||
| 184 | } | ||
| 185 | |||
| 186 | /* | ||
| 187 | * Return the character set id | ||
| 188 | */ | ||
| 189 | public String getCharacterEncoding() { | ||
| 190 | return "UTF8"; | ||
| 191 | } | ||
| 192 | |||
| 193 | /* | ||
| 194 | * Reset after finding bad input | ||
| 195 | */ | ||
| 196 | public void reset() { | ||
| 197 | byteOff = charOff = 0; | ||
| 198 | savedSize = 0; | ||
| 199 | } | ||
| 200 | } | ||