116 lines
3.8 KiB
Java
116 lines
3.8 KiB
Java
/*
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* Copyright (c) 2000, 2012, 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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/*
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*/
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetDecoder;
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import java.nio.charset.CoderResult;
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import java.nio.charset.CharacterCodingException;
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import java.nio.charset.MalformedInputException;
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import java.nio.charset.UnmappableCharacterException;
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public abstract class SingleByteDecoder
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extends CharsetDecoder
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{
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private final String byteToCharTable;
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protected SingleByteDecoder(Charset cs, String byteToCharTable) {
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super(cs, 1.0f, 1.0f);
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this.byteToCharTable = byteToCharTable;
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}
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private CoderResult decodeArrayLoop(ByteBuffer src, CharBuffer dst) {
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byte[] sa = src.array();
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int sp = src.arrayOffset() + src.position();
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int sl = src.arrayOffset() + src.limit();
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assert (sp <= sl);
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sp = (sp <= sl ? sp : sl);
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char[] da = dst.array();
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int dp = dst.arrayOffset() + dst.position();
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int dl = dst.arrayOffset() + dst.limit();
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assert (dp <= dl);
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dp = (dp <= dl ? dp : dl);
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try {
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while (sp < sl) {
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int b = sa[sp];
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char c = decode(b);
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if (c == '\uFFFD')
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return CoderResult.unmappableForLength(1);
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if (dl - dp < 1)
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return CoderResult.OVERFLOW;
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da[dp++] = c;
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sp++;
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}
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return CoderResult.UNDERFLOW;
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} finally {
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src.position(sp - src.arrayOffset());
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dst.position(dp - dst.arrayOffset());
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}
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}
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private CoderResult decodeBufferLoop(ByteBuffer src, CharBuffer dst) {
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int mark = src.position();
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try {
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while (src.hasRemaining()) {
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int b = src.get();
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char c = decode(b);
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if (c == '\uFFFD')
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return CoderResult.unmappableForLength(1);
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if (!dst.hasRemaining())
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return CoderResult.OVERFLOW;
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mark++;
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dst.put(c);
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}
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return CoderResult.UNDERFLOW;
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} finally {
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src.position(mark);
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}
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}
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protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {
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if (true && src.hasArray() && dst.hasArray())
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return decodeArrayLoop(src, dst);
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else
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return decodeBufferLoop(src, dst);
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}
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public char decode(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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