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/*
* Copyright (c) 2001, 2005, 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.
*/
import java.nio.CharBuffer;
import java.nio.ByteBuffer;
import java.nio.charset.*;
import sun.nio.cs.ext.EUC_TW;
public abstract class X11CNS11643 extends Charset {
private final int plane;
public X11CNS11643 (int plane, String name) {
super(name, null);
switch (plane) {
case 1:
this.plane = 0; // CS1
break;
case 2:
case 3:
this.plane = plane;
break;
default:
throw new IllegalArgumentException
("Only planes 1, 2, and 3 supported");
}
}
public CharsetEncoder newEncoder() {
return new Encoder(this, plane);
}
public CharsetDecoder newDecoder() {
return new Decoder(this, plane);
}
public boolean contains(Charset cs) {
return cs instanceof X11CNS11643;
}
private class Encoder extends EUC_TW_OLD.Encoder {
private int plane;
public Encoder(Charset cs, int plane) {
super(cs);
this.plane = plane;
}
public boolean canEncode(char c) {
if (c <= 0x7F) {
return false;
}
int p = getNative(c) >> 16;
if (p == 1 && plane == 0 ||
p == 2 && plane == 2 ||
p == 3 && plane == 3)
return true;
return false;
}
public boolean isLegalReplacement(byte[] repl) {
return true;
}
protected CoderResult encodeLoop(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 (c >= '\uFFFE' || c <= '\u007f')
return CoderResult.unmappableForLength(1);
int cns = getNative(c);
int p = cns >> 16;
if (p == 1 && plane == 0 ||
p == 2 && plane == 2 ||
p == 3 && plane == 3) {
if (dl - dp < 2)
return CoderResult.OVERFLOW;
da[dp++] = (byte) ((cns >> 8) & 0x7f);
da[dp++] = (byte) (cns & 0x7f);
sp++;
continue;
}
return CoderResult.unmappableForLength(1);
}
return CoderResult.UNDERFLOW;
} finally {
src.position(sp - src.arrayOffset());
dst.position(dp - dst.arrayOffset());
}
}
}
private class Decoder extends EUC_TW_OLD.Decoder {
private String table;
protected Decoder(Charset cs, int plane) {
super(cs);
switch (plane) {
case 0:
table = unicodeCNS1;
break;
case 2:
table = unicodeCNS2;
break;
case 3:
table = unicodeCNS3;
break;
default:
throw new IllegalArgumentException
("Only planes 1, 2, and 3 supported");
}
}
//we only work on array backed buffer.
protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {
byte[] sa = src.array();
int sp = src.arrayOffset() + src.position();
int sl = src.arrayOffset() + src.limit();
assert (sp <= sl);
sp = (sp <= sl ? sp : sl);
char[] da = dst.array();
int dp = dst.arrayOffset() + dst.position();
int dl = dst.arrayOffset() + dst.limit();
assert (dp <= dl);
dp = (dp <= dl ? dp : dl);
try {
while (sp < sl) {
if ( sl - sp < 2) {
return CoderResult.UNDERFLOW;
}
byte b1 = sa[sp];
byte b2 = sa[sp + 1];
char c = replacement().charAt(0);
if (table == unicodeCNS3) {
char[] cc = convToSurrogate((byte)(b1 | 0x80),
(byte)(b2 | 0x80),
table);
if (cc != null && cc[0] == '\u0000')
c = cc[1];
} else {
c = convToUnicode((byte)(b1 | 0x80),
(byte)(b2 | 0x80),
table);
}
if (c == replacement().charAt(0)
//to keep the compatibility with b2cX11CNS11643
/*|| c == '\u0000'*/) {
return CoderResult.unmappableForLength(2);
}
if (dl - dp < 1)
return CoderResult.OVERFLOW;
da[dp++] = c;
sp +=2;
}
return CoderResult.UNDERFLOW;
} finally {
src.position(sp - src.arrayOffset());
dst.position(dp - dst.arrayOffset());
}
}
}
}
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