| /* |
| * Copyright (c) 1996, 2002, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.io; |
| |
| /** |
| * A table driven conversion from byte to char for single byte character sets. |
| * The needed data tables will reside in a character set specific subclass. |
| * |
| * @author Lloyd Honomichl |
| * @author Asmus Freytag |
| */ |
| public abstract class ByteToCharSingleByte extends ByteToCharConverter { |
| |
| /** |
| * Mapping table. Values supplied by subclass |
| */ |
| protected String byteToCharTable; |
| |
| public String getByteToCharTable() { |
| return byteToCharTable; |
| } |
| |
| public int flush(char[] output, int outStart, int outEnd) { |
| byteOff = charOff = 0; |
| return 0; |
| } |
| |
| /** |
| * Converts bytes to characters according to the selected character |
| * encoding. |
| * Maintains internal state, so that conversions that result in |
| * exceptions can be restarted by calling convert again, with |
| * appropriately modified parameters. |
| * Call reset before converting input that is not a continuation of |
| * the previous call. |
| * @return the number of characters written to output. |
| * @param input byte array containing text in character set |
| * @param inStart offset in input array |
| * @param inEnd offset of last byte to be converted |
| * @param output character array to receive conversion result |
| * @param outStart starting offset |
| * @param outEnd offset of last character to be written to |
| * @throw MalformedInputException for any sequence of bytes that is |
| * illegal for the input character set, including any partial multi-byte |
| * sequence which occurs at the end of an input buffer. |
| * @throw UnsupportedCharacterException for any sequence of bytes that |
| * contain a character not supported in the current conversion. |
| * @throw BufferFullException whenever the output buffer is full |
| * before the input is exhausted. |
| * @see #reset |
| */ |
| public int convert(byte[] input, int inOff, int inEnd, |
| char[] output, int outOff, int outEnd) |
| throws UnknownCharacterException, |
| MalformedInputException, |
| ConversionBufferFullException |
| { |
| char outputChar; |
| int byteIndex; |
| |
| charOff = outOff; |
| byteOff = inOff; |
| |
| // Loop until we hit the end of the input |
| while(byteOff < inEnd) { |
| |
| byteIndex = input[byteOff]; |
| |
| /* old source |
| *outputChar = byteToCharTable[input[byteOff] + 128]; |
| */ |
| // Lookup the output character |
| outputChar = getUnicode(byteIndex); |
| |
| // Is the output unmappable? |
| if (outputChar == '\uFFFD') { |
| if (subMode) { |
| outputChar = subChars[0]; |
| } else { |
| badInputLength = 1; |
| throw new UnknownCharacterException(); |
| } |
| } |
| |
| // If we don't have room for the output, throw an exception |
| if (charOff >= outEnd) |
| throw new ConversionBufferFullException(); |
| |
| // Put the character in the output buffer |
| output[charOff]= outputChar; |
| charOff++; |
| byteOff++; |
| } |
| |
| // Return the length written to the output buffer |
| return charOff-outOff; |
| } |
| |
| protected char getUnicode(int byteIndex) { |
| int n = byteIndex + 128; |
| if (n >= byteToCharTable.length() || n < 0) |
| return '\uFFFD'; |
| return byteToCharTable.charAt(n); |
| } |
| |
| /** |
| * Resets the converter. |
| * Call this method to reset the converter to its initial state |
| */ |
| public void reset() { |
| byteOff = charOff = 0; |
| } |
| |
| } |