/* * Copyright (c) 2008, 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.nio.cs; import java.nio.Buffer;import java.nio.ByteBuffer;import java.nio.CharBuffer;import java.nio.charset.Charset;import java.nio.charset.CharsetDecoder;import java.nio.charset.CharsetEncoder;import java.nio.charset.CoderResult;import java.util.Arrays;import static sun.nio.cs.CharsetMapping.*; public class SingleByte{    private static final CoderResult withResult(CoderResult cr,                                                Buffer src, int sp,                                                Buffer dst, int dp)    {        src.position(sp - src.arrayOffset());        dst.position(dp - dst.arrayOffset());        return cr;    }     final public static class Decoder extends CharsetDecoder                                      implements ArrayDecoder {        private final char[] b2c;         public Decoder(Charset cs, char[] b2c) {            super(cs, 1.0f, 1.0f);            this.b2c = b2c;        }         private CoderResult decodeArrayLoop(ByteBuffer src, CharBuffer dst) {            byte[] sa = src.array();            int sp = src.arrayOffset() + src.position();            int sl = src.arrayOffset() + src.limit();             char[] da = dst.array();            int dp = dst.arrayOffset() + dst.position();            int dl = dst.arrayOffset() + dst.limit();             CoderResult cr = CoderResult.UNDERFLOW;            if ((dl - dp) < (sl - sp)) {                sl = sp + (dl - dp);                cr = CoderResult.OVERFLOW;            }             while (sp < sl) {                char c = decode(sa[sp]);                if (c == UNMAPPABLE_DECODING) {                    return withResult(CoderResult.unmappableForLength(1),                               src, sp, dst, dp);                }                da[dp++] = c;                sp++;            }            return withResult(cr, src, sp, dst, dp);        }         private CoderResult decodeBufferLoop(ByteBuffer src, CharBuffer dst) {            int mark = src.position();            try {                while (src.hasRemaining()) {                    char c = decode(src.get());                    if (c == UNMAPPABLE_DECODING)                        return CoderResult.unmappableForLength(1);                    if (!dst.hasRemaining())                        return CoderResult.OVERFLOW;                    dst.put(c);                    mark++;                }                return CoderResult.UNDERFLOW;            } finally {                src.position(mark);            }        }         protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {            if (src.hasArray() && dst.hasArray())                return decodeArrayLoop(src, dst);            else                return decodeBufferLoop(src, dst);        }         private final char decode(int b) {            return b2c[b + 128];        }         private char repl = '\uFFFD';        protected void implReplaceWith(String newReplacement) {            repl = newReplacement.charAt(0);        }         public int decode(byte[] src, int sp, int len, char[] dst) {            if (len > dst.length)                len = dst.length;            int dp = 0;            while (dp < len) {                dst[dp] = decode(src[sp++]);                if (dst[dp] == UNMAPPABLE_DECODING) {                    dst[dp] = repl;                }                dp++;            }            return dp;        }    }     final public static class Encoder extends CharsetEncoder                                      implements ArrayEncoder {        private Surrogate.Parser sgp;        private final char[] c2b;        private final char[] c2bIndex;         public Encoder(Charset cs, char[] c2b, char[] c2bIndex) {            super(cs, 1.0f, 1.0f);            this.c2b = c2b;            this.c2bIndex = c2bIndex;        }         public boolean canEncode(char c) {            return encode(c) != UNMAPPABLE_ENCODING;        }         public boolean isLegalReplacement(byte[] repl) {            return ((repl.length == 1 && repl[0] == (byte)'?') ||                    super.isLegalReplacement(repl));        }         private CoderResult encodeArrayLoop(CharBuffer src, ByteBuffer dst) {            char[] sa = src.array();            int sp = src.arrayOffset() + src.position();            int sl = src.arrayOffset() + src.limit();             byte[] da = dst.array();            int dp = dst.arrayOffset() + dst.position();            int dl = dst.arrayOffset() + dst.limit();             CoderResult cr = CoderResult.UNDERFLOW;            if ((dl - dp) < (sl - sp)) {                sl = sp + (dl - dp);                cr = CoderResult.OVERFLOW;            }             while (sp < sl) {                char c = sa[sp];                int b = encode(c);                if (b == UNMAPPABLE_ENCODING) {                    if (Character.isSurrogate(c)) {                        if (sgp == null)                            sgp = new Surrogate.Parser();                        if (sgp.parse(c, sa, sp, sl) < 0)                            return withResult(sgp.error(), src, sp, dst, dp);                        return withResult(sgp.unmappableResult(), src, sp, dst, dp);                    }                    return withResult(CoderResult.unmappableForLength(1),                               src, sp, dst, dp);                }                da[dp++] = (byte)b;                sp++;            }            return withResult(cr, src, sp, dst, dp);        }         private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {            int mark = src.position();            try {                while (src.hasRemaining()) {                    char c = src.get();                    int b = encode(c);                    if (b == UNMAPPABLE_ENCODING) {                        if (Character.isSurrogate(c)) {                            if (sgp == null)                                sgp = new Surrogate.Parser();                            if (sgp.parse(c, src) < 0)                                return sgp.error();                            return sgp.unmappableResult();                        }                        return CoderResult.unmappableForLength(1);                    }                    if (!dst.hasRemaining())                        return CoderResult.OVERFLOW;                    dst.put((byte)b);                    mark++;                }                return CoderResult.UNDERFLOW;            } finally {                src.position(mark);            }        }         protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {            if (src.hasArray() && dst.hasArray())                return encodeArrayLoop(src, dst);            else                return encodeBufferLoop(src, dst);        }         private final int encode(char ch) {            char index = c2bIndex[ch >> 8];            if (index == UNMAPPABLE_ENCODING)                return UNMAPPABLE_ENCODING;            return c2b[index + (ch & 0xff)];        }         private byte repl = (byte)'?';        protected void implReplaceWith(byte[] newReplacement) {            repl = newReplacement[0];        }         public int encode(char[] src, int sp, int len, byte[] dst) {            int dp = 0;            int sl = sp + Math.min(len, dst.length);            while (sp < sl) {                char c = src[sp++];                int b = encode(c);                if (b != UNMAPPABLE_ENCODING) {                    dst[dp++] = (byte)b;                    continue;                }                if (Character.isHighSurrogate(c) && sp < sl &&                    Character.isLowSurrogate(src[sp])) {                    if (len > dst.length) {                        sl++;                        len--;                    }                    sp++;                }                dst[dp++] = repl;            }            return dp;        }    }     // init the c2b and c2bIndex tables from b2c.    public static void initC2B(char[] b2c, char[] c2bNR,                               char[] c2b, char[] c2bIndex) {        for (int i = 0; i < c2bIndex.length; i++)            c2bIndex[i] = UNMAPPABLE_ENCODING;        for (int i = 0; i < c2b.length; i++)            c2b[i] = UNMAPPABLE_ENCODING;        int off = 0;        for (int i = 0; i < b2c.length; i++) {            char c = b2c[i];            if (c == UNMAPPABLE_DECODING)                continue;            int index = (c >> 8);            if (c2bIndex[index] == UNMAPPABLE_ENCODING) {                c2bIndex[index] = (char)off;                off += 0x100;            }            index = c2bIndex[index] + (c & 0xff);            c2b[index] = (char)((i>=0x80)?(i-0x80):(i+0x80));        }        if (c2bNR != null) {            // c-->b nr entries            int i = 0;            while (i < c2bNR.length) {                char b = c2bNR[i++];                char c = c2bNR[i++];                int index = (c >> 8);                if (c2bIndex[index] == UNMAPPABLE_ENCODING) {                    c2bIndex[index] = (char)off;                    off += 0x100;                }                index = c2bIndex[index] + (c & 0xff);                c2b[index] = b;            }        }    }}