/*
* Copyright 2002-2006 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package sun.nio.cs.ext;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import sun.nio.cs.Surrogate;
public abstract class DoubleByteEncoder
extends CharsetEncoder
{
private short index1[];
private String index2[];
private final Surrogate.Parser sgp = new Surrogate.Parser();
protected DoubleByteEncoder(Charset cs,
short[] index1, String[] index2)
{
super(cs, 2.0f, 2.0f);
this.index1 = index1;
this.index2 = index2;
}
protected DoubleByteEncoder(Charset cs,
short[] index1, String[] index2,
float avg, float max)
{
super(cs, avg, max);
this.index1 = index1;
this.index2 = index2;
}
protected DoubleByteEncoder(Charset cs,
short[] index1, String[] index2, byte[] repl)
{
super(cs, 2.0f, 2.0f, repl);
this.index1 = index1;
this.index2 = index2;
}
protected DoubleByteEncoder(Charset cs,
short[] index1, String[] index2,
byte[] repl, float avg, float max)
{
super(cs, avg, max,repl);
this.index1 = index1;
this.index2 = index2;
}
public boolean canEncode(char c) {
return (encodeSingle(c) != -1 ||
encodeDouble(c) != 0);
}
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();
try {
while (sp < sl) {
char c = sa[sp];
if (Surrogate.is(c)) {
if (sgp.parse(c, sa, sp, sl) < 0)
return sgp.error();
if (sl - sp < 2)
return CoderResult.UNDERFLOW;
char c2 = sa[sp + 1];
byte[] outputBytes = new byte[2];
outputBytes = encodeSurrogate(c, c2);
if (outputBytes == null) {
return sgp.unmappableResult();
}
else {
if (dl - dp < 2)
return CoderResult.OVERFLOW;
da[dp++] = outputBytes[0];
da[dp++] = outputBytes[1];
sp += 2;
continue;
}
}
if (c >= '\uFFFE')
return CoderResult.unmappableForLength(1);
int b = encodeSingle(c);
if (b != -1) { // Single Byte
if (dl - dp < 1)
return CoderResult.OVERFLOW;
da[dp++] = (byte)b;
sp++;
continue;
}
int ncode = encodeDouble(c);
if (ncode != 0 && c != '\u0000' ) {
if (dl - dp < 2)
return CoderResult.OVERFLOW;
da[dp++] = (byte) ((ncode & 0xff00) >> 8);
da[dp++] = (byte) (ncode & 0xff);
sp++;
continue;
}
return CoderResult.unmappableForLength(1);
}
return CoderResult.UNDERFLOW;
} finally {
src.position(sp - src.arrayOffset());
dst.position(dp - dst.arrayOffset());
}
}
private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {
int mark = src.position();
try {
while (src.hasRemaining()) {
char c = src.get();
if (Surrogate.is(c)) {
int surr;
if ((surr = sgp.parse(c, src)) < 0)
return sgp.error();
char c2 = Surrogate.low(surr);
byte[] outputBytes = new byte[2];
outputBytes = encodeSurrogate(c, c2);
if (outputBytes == null) {
return sgp.unmappableResult();
} else {
if (dst.remaining() < 2)
return CoderResult.OVERFLOW;
mark += 2;
dst.put(outputBytes[0]);
dst.put(outputBytes[1]);
continue;
}
}
if (c >= '\uFFFE')
return CoderResult.unmappableForLength(1);
int b = encodeSingle(c);
if (b != -1) { // Single-byte character
if (dst.remaining() < 1)
return CoderResult.OVERFLOW;
mark++;
dst.put((byte)b);
continue;
}
// Double Byte character
int ncode = encodeDouble(c);
if (ncode != 0 && c != '\u0000') {
if (dst.remaining() < 2)
return CoderResult.OVERFLOW;
mark++;
dst.put((byte) ((ncode & 0xff00) >> 8));
dst.put((byte) ncode);
continue;
}
return CoderResult.unmappableForLength(1);
}
return CoderResult.UNDERFLOW;
} finally {
src.position(mark);
}
}
protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
if (true && src.hasArray() && dst.hasArray())
return encodeArrayLoop(src, dst);
else
return encodeBufferLoop(src, dst);
}
/*
* Can be changed by subclass
*/
protected int encodeDouble(char ch) {
int offset = index1[((ch & 0xff00) >> 8 )] << 8;
return index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff));
}
/*
* Can be changed by subclass
*/
protected int encodeSingle(char inputChar) {
if (inputChar < 0x80)
return (byte)inputChar;
else
return -1;
}
/**
* Protected method which should be overridden by concrete DBCS
* CharsetEncoder classes which included supplementary characters
* within their mapping coverage.
* null return value indicates surrogate values could not be
* handled or encoded.
*/
protected byte[] encodeSurrogate(char highSurrogate, char lowSurrogate) {
return null;
}
}