001: /*
002: * @(#)CharToByteISO8859_1.java 1.28 06/10/10
003: *
004: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
005: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006: *
007: * This program is free software; you can redistribute it and/or
008: * modify it under the terms of the GNU General Public License version
009: * 2 only, as published by the Free Software Foundation.
010: *
011: * This program is distributed in the hope that it will be useful, but
012: * WITHOUT ANY WARRANTY; without even the implied warranty of
013: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014: * General Public License version 2 for more details (a copy is
015: * included at /legal/license.txt).
016: *
017: * You should have received a copy of the GNU General Public License
018: * version 2 along with this work; if not, write to the Free Software
019: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020: * 02110-1301 USA
021: *
022: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023: * Clara, CA 95054 or visit www.sun.com if you need additional
024: * information or have any questions.
025: *
026: */
027: package sun.io;
028:
029: public class CharToByteISO8859_1 extends CharToByteConverter {
030:
031: // Return the character set ID
032: public String getCharacterEncoding() {
033: return "ISO8859_1";
034: }
035:
036: private char highHalfZoneCode;
037:
038: public int flush(byte[] output, int outStart, int outEnd)
039: throws MalformedInputException {
040: if (highHalfZoneCode != 0) {
041: highHalfZoneCode = 0;
042: throw new MalformedInputException(
043: "String ends with <High Half Zone code> of UTF16");
044: }
045: byteOff = charOff = 0;
046: return 0;
047: }
048:
049: /*
050: * Character conversion
051: */
052: public native int convert(char[] input, int inOff, int inEnd,
053: byte[] output, int outOff, int outEnd)
054: throws MalformedInputException, UnknownCharacterException,
055: ConversionBufferFullException;
056:
057: /**
058: * This method is changed to a CNI method
059: * for performance purpose.
060: *
061: *public int convert(char[] input, int inOff, int inEnd,
062: * byte[] output, int outOff, int outEnd)
063: * throws MalformedInputException,
064: * UnknownCharacterException,
065: * ConversionBufferFullException
066: *
067: *{
068: *
069: * char inputChar; // Input character to be converted
070: * int outputSize; // Size of output
071: *
072: * // Record beginning offsets
073: * charOff = inOff;
074: * byteOff = outOff;
075: *
076: * if (highHalfZoneCode != 0) {
077: * highHalfZoneCode = 0;
078: * if (input[inOff] >= 0xdc00 && input[inOff] <= 0xdfff) {
079: * // This is legal UTF16 sequence.
080: * if (subMode) {
081: * outputSize = subBytes.length;
082: * if (byteOff + outputSize > outEnd)
083: * throw new ConversionBufferFullException();
084: * System.arraycopy(subBytes, 0, output, byteOff, outputSize);
085: * byteOff += outputSize;
086: * charOff += 1;
087: * } else {
088: * badInputLength = 1;
089: * throw new UnknownCharacterException();
090: * }
091: * } else {
092: * // This is illegal UTF16 sequence.
093: * badInputLength = 0;
094: * throw new MalformedInputException
095: * ("Previous converted string ends with " +
096: * "<High Half Zone Code> of UTF16 " +
097: * ", but this string is not begin with <Low Half Zone>");
098: * }
099: * }
100: *
101: * // Loop until we hit the end of the input
102: * while(charOff < inEnd) {
103: * // Get the input character
104: * inputChar = input[charOff];
105: *
106: * // Is this character mappable?
107: * if (inputChar <= '\u00FF') {
108: * if (byteOff + 1 > outEnd)
109: * throw new ConversionBufferFullException();
110: *
111: * output[byteOff++] = (byte)inputChar;
112: * charOff += 1;
113: * }
114: * // Is this a high surrogate?
115: * else if(inputChar >= '\uD800' && inputChar <= '\uDBFF') {
116: * // Is this the last character in the input?
117: * if (charOff + 1 == inEnd) {
118: * highHalfZoneCode = inputChar;
119: * break;
120: * }
121: *
122: * // Is there a low surrogate following?
123: * inputChar = input[charOff + 1];
124: * if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') {
125: * // We have a valid surrogate pair. Too bad we don't map
126: * // surrogates. Is substitution enabled?
127: * if (subMode) {
128: * outputSize = subBytes.length;
129: *
130: * if (byteOff + outputSize > outEnd)
131: * throw new ConversionBufferFullException();
132: *
133: * System.arraycopy(subBytes, 0, output, byteOff, outputSize);
134: * byteOff += outputSize;
135: * charOff += 2;
136: *
137: * } else {
138: * badInputLength = 2;
139: * throw new UnknownCharacterException();
140: * }
141: * } else {
142: * // We have a malformed surrogate pair
143: * badInputLength = 1;
144: * throw new MalformedInputException();
145: * }
146: * }
147: * // Is this an unaccompanied low surrogate?
148: * else if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') {
149: * badInputLength = 1;
150: * throw new MalformedInputException();
151: * }
152: * // Unmappable and not part of a surrogate
153: * else {
154: * // Is substitution enabled?
155: * if (subMode) {
156: * outputSize = subBytes.length;
157: *
158: * if (byteOff + outputSize > outEnd)
159: * throw new ConversionBufferFullException();
160: *
161: * System.arraycopy(subBytes, 0, output, byteOff, outputSize);
162: * byteOff += outputSize;
163: * charOff += 1;
164: *
165: * } else {
166: * badInputLength = 1;
167: * throw new UnknownCharacterException();
168: * }
169: * }
170: * }
171: *
172: * // Return the length written to the output buffer
173: * return byteOff-outOff;
174: *}
175: */
176:
177: // Determine if a character is mappable or not
178: public boolean canConvert(char ch) {
179: return (ch <= '\u00FF');
180: }
181:
182: // Reset the converter
183: public void reset() {
184: byteOff = charOff = 0;
185: highHalfZoneCode = 0;
186: }
187:
188: /**
189: * returns the maximum number of bytes needed to convert a char
190: */
191: public int getMaxBytesPerChar() {
192: return 1;
193: }
194:
195: }
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