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