Java example source code file (ISO2022_CN.java)
The ISO2022_CN.java Java example source code/*
* Copyright (c) 2003, 2006, 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.ext;
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.nio.charset.CharacterCodingException;
import sun.nio.cs.HistoricallyNamedCharset;
import sun.nio.cs.US_ASCII;
public class ISO2022_CN
extends Charset
implements HistoricallyNamedCharset
{
private static final byte ISO_ESC = 0x1b;
private static final byte ISO_SI = 0x0f;
private static final byte ISO_SO = 0x0e;
private static final byte ISO_SS2_7 = 0x4e;
private static final byte ISO_SS3_7 = 0x4f;
private static final byte MSB = (byte)0x80;
private static final char REPLACE_CHAR = '\uFFFD';
private static final byte SODesigGB = 0;
private static final byte SODesigCNS = 1;
public ISO2022_CN() {
super("ISO-2022-CN", ExtendedCharsets.aliasesFor("ISO-2022-CN"));
}
public String historicalName() {
return "ISO2022CN";
}
public boolean contains(Charset cs) {
return ((cs instanceof EUC_CN) // GB2312-80 repertoire
|| (cs instanceof US_ASCII)
|| (cs instanceof EUC_TW) // CNS11643 repertoire
|| (cs instanceof ISO2022_CN));
}
public CharsetDecoder newDecoder() {
return new Decoder(this);
}
public CharsetEncoder newEncoder() {
throw new UnsupportedOperationException();
}
public boolean canEncode() {
return false;
}
static class Decoder extends CharsetDecoder {
private boolean shiftOut;
private byte currentSODesig;
private static final Charset gb2312 = new EUC_CN();
private static final Charset cns = new EUC_TW();
private final DoubleByte.Decoder gb2312Decoder;
private final EUC_TW.Decoder cnsDecoder;
Decoder(Charset cs) {
super(cs, 1.0f, 1.0f);
shiftOut = false;
currentSODesig = SODesigGB;
gb2312Decoder = (DoubleByte.Decoder)gb2312.newDecoder();
cnsDecoder = (EUC_TW.Decoder)cns.newDecoder();
}
protected void implReset() {
shiftOut= false;
currentSODesig = SODesigGB;
}
private char cnsDecode(byte byte1, byte byte2, byte SS) {
byte1 |= MSB;
byte2 |= MSB;
int p = 0;
if (SS == ISO_SS2_7)
p = 1; //plane 2, index -- 1
else if (SS == ISO_SS3_7)
p = 2; //plane 3, index -- 2
else
return REPLACE_CHAR; //never happen.
char[] ret = cnsDecoder.toUnicode(byte1 & 0xff,
byte2 & 0xff,
p);
if (ret == null || ret.length == 2)
return REPLACE_CHAR;
return ret[0];
}
private char SODecode(byte byte1, byte byte2, byte SOD) {
byte1 |= MSB;
byte2 |= MSB;
if (SOD == SODesigGB) {
return gb2312Decoder.decodeDouble(byte1 & 0xff,
byte2 & 0xff);
} else { // SOD == SODesigCNS
char[] ret = cnsDecoder.toUnicode(byte1 & 0xff,
byte2 & 0xff,
0);
if (ret == null)
return REPLACE_CHAR;
return ret[0];
}
}
private CoderResult decodeBufferLoop(ByteBuffer src,
CharBuffer dst)
{
int mark = src.position();
byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;
int inputSize = 0;
char c = REPLACE_CHAR;
try {
while (src.hasRemaining()) {
b1 = src.get();
inputSize = 1;
while (b1 == ISO_ESC ||
b1 == ISO_SO ||
b1 == ISO_SI) {
if (b1 == ISO_ESC) { // ESC
currentSODesig = SODesigGB;
if (src.remaining() < 1)
return CoderResult.UNDERFLOW;
b2 = src.get();
inputSize++;
if ((b2 & (byte)0x80) != 0)
return CoderResult.malformedForLength(inputSize);
if (b2 == (byte)0x24) {
if (src.remaining() < 1)
return CoderResult.UNDERFLOW;
b3 = src.get();
inputSize++;
if ((b3 & (byte)0x80) != 0)
return CoderResult.malformedForLength(inputSize);
if (b3 == 'A'){ // "$A"
currentSODesig = SODesigGB;
} else if (b3 == ')') {
if (src.remaining() < 1)
return CoderResult.UNDERFLOW;
b4 = src.get();
inputSize++;
if (b4 == 'A'){ // "$)A"
currentSODesig = SODesigGB;
} else if (b4 == 'G'){ // "$)G"
currentSODesig = SODesigCNS;
} else {
return CoderResult.malformedForLength(inputSize);
}
} else if (b3 == '*') {
if (src.remaining() < 1)
return CoderResult.UNDERFLOW;
b4 = src.get();
inputSize++;
if (b4 != 'H') { // "$*H"
//SS2Desig -> CNS-P1
return CoderResult.malformedForLength(inputSize);
}
} else if (b3 == '+') {
if (src.remaining() < 1)
return CoderResult.UNDERFLOW;
b4 = src.get();
inputSize++;
if (b4 != 'I'){ // "$+I"
//SS3Desig -> CNS-P2.
return CoderResult.malformedForLength(inputSize);
}
} else {
return CoderResult.malformedForLength(inputSize);
}
} else if (b2 == ISO_SS2_7 || b2 == ISO_SS3_7) {
if (src.remaining() < 2)
return CoderResult.UNDERFLOW;
b3 = src.get();
b4 = src.get();
inputSize += 2;
if (dst.remaining() < 1)
return CoderResult.OVERFLOW;
//SS2->CNS-P2, SS3->CNS-P3
c = cnsDecode(b3, b4, b2);
if (c == REPLACE_CHAR)
return CoderResult.unmappableForLength(inputSize);
dst.put(c);
} else {
return CoderResult.malformedForLength(inputSize);
}
} else if (b1 == ISO_SO) {
shiftOut = true;
} else if (b1 == ISO_SI) { // shift back in
shiftOut = false;
}
mark += inputSize;
if (src.remaining() < 1)
return CoderResult.UNDERFLOW;
b1 = src.get();
inputSize = 1;
}
if (dst.remaining() < 1)
return CoderResult.OVERFLOW;
if (!shiftOut) {
dst.put((char)(b1 & 0xff)); //clear the upper byte
mark += inputSize;
} else {
if (src.remaining() < 1)
return CoderResult.UNDERFLOW;
b2 = src.get();
inputSize++;
c = SODecode(b1, b2, currentSODesig);
if (c == REPLACE_CHAR)
return CoderResult.unmappableForLength(inputSize);
dst.put(c);
mark += inputSize;
}
}
return CoderResult.UNDERFLOW;
} finally {
src.position(mark);
}
}
private CoderResult decodeArrayLoop(ByteBuffer src,
CharBuffer dst)
{
int inputSize = 0;
byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;
char c = REPLACE_CHAR;
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) {
b1 = sa[sp];
inputSize = 1;
while (b1 == ISO_ESC || b1 == ISO_SO || b1 == ISO_SI) {
if (b1 == ISO_ESC) { // ESC
currentSODesig = SODesigGB;
if (sp + 2 > sl)
return CoderResult.UNDERFLOW;
b2 = sa[sp + 1];
inputSize++;
if ((b2 & (byte)0x80) != 0)
return CoderResult.malformedForLength(inputSize);
if (b2 == (byte)0x24) {
if (sp + 3 > sl)
return CoderResult.UNDERFLOW;
b3 = sa[sp + 2];
inputSize++;
if ((b3 & (byte)0x80) != 0)
return CoderResult.malformedForLength(inputSize);
if (b3 == 'A'){ // "$A"
/* <ESC>$A is not a legal designator sequence for
ISO2022_CN, it is listed as an escape sequence
for GB2312 in ISO2022-JP-2. Keep it here just for
the sake of "compatibility".
*/
currentSODesig = SODesigGB;
} else if (b3 == ')') {
if (sp + 4 > sl)
return CoderResult.UNDERFLOW;
b4 = sa[sp + 3];
inputSize++;
if (b4 == 'A'){ // "$)A"
currentSODesig = SODesigGB;
} else if (b4 == 'G'){ // "$)G"
currentSODesig = SODesigCNS;
} else {
return CoderResult.malformedForLength(inputSize);
}
} else if (b3 == '*') {
if (sp + 4 > sl)
return CoderResult.UNDERFLOW;
b4 = sa[sp + 3];
inputSize++;
if (b4 != 'H'){ // "$*H"
return CoderResult.malformedForLength(inputSize);
}
} else if (b3 == '+') {
if (sp + 4 > sl)
return CoderResult.UNDERFLOW;
b4 = sa[sp + 3];
inputSize++;
if (b4 != 'I'){ // "$+I"
return CoderResult.malformedForLength(inputSize);
}
} else {
return CoderResult.malformedForLength(inputSize);
}
} else if (b2 == ISO_SS2_7 || b2 == ISO_SS3_7) {
if (sp + 4 > sl) {
return CoderResult.UNDERFLOW;
}
b3 = sa[sp + 2];
b4 = sa[sp + 3];
if (dl - dp < 1) {
return CoderResult.OVERFLOW;
}
inputSize += 2;
c = cnsDecode(b3, b4, b2);
if (c == REPLACE_CHAR)
return CoderResult.unmappableForLength(inputSize);
da[dp++] = c;
} else {
return CoderResult.malformedForLength(inputSize);
}
} else if (b1 == ISO_SO) {
shiftOut = true;
} else if (b1 == ISO_SI) { // shift back in
shiftOut = false;
}
sp += inputSize;
if (sp + 1 > sl)
return CoderResult.UNDERFLOW;
b1 = sa[sp];
inputSize = 1;
}
if (dl - dp < 1) {
return CoderResult.OVERFLOW;
}
if (!shiftOut) {
da[dp++] = (char)(b1 & 0xff); //clear the upper byte
} else {
if (sp + 2 > sl)
return CoderResult.UNDERFLOW;
b2 = sa[sp + 1];
inputSize++;
c = SODecode(b1, b2, currentSODesig);
if (c == REPLACE_CHAR)
return CoderResult.unmappableForLength(inputSize);
da[dp++] = c;
}
sp += inputSize;
}
return CoderResult.UNDERFLOW;
} finally {
src.position(sp - src.arrayOffset());
dst.position(dp - dst.arrayOffset());
}
}
protected CoderResult decodeLoop(ByteBuffer src,
CharBuffer dst)
{
if (src.hasArray() && dst.hasArray())
return decodeArrayLoop(src, dst);
else
return decodeBufferLoop(src, dst);
}
}
}
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