Java example source code file (ISO2022.java)
The ISO2022.java Java example source code
/*
* Copyright (c) 2002, 2010, 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 sun.nio.cs.Surrogate;
abstract class ISO2022
extends Charset
{
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 minDesignatorLength = 3;
public ISO2022(String csname, String[] aliases) {
super(csname, aliases);
}
public CharsetDecoder newDecoder() {
return new Decoder(this);
}
public CharsetEncoder newEncoder() {
return new Encoder(this);
}
protected static class Decoder extends CharsetDecoder {
// Value to be filled by subclass
protected byte SODesig[][];
protected byte SS2Desig[][] = null;
protected byte SS3Desig[][] = null;
protected CharsetDecoder SODecoder[];
protected CharsetDecoder SS2Decoder[] = null;
protected CharsetDecoder SS3Decoder[] = null;
private static final byte SOFlag = 0;
private static final byte SS2Flag = 1;
private static final byte SS3Flag = 2;
private int curSODes, curSS2Des, curSS3Des;
private boolean shiftout;
private CharsetDecoder tmpDecoder[];
protected Decoder(Charset cs) {
super(cs, 1.0f, 1.0f);
}
protected void implReset() {
curSODes = 0;
curSS2Des = 0;
curSS3Des = 0;
shiftout = false;
}
private char decode(byte byte1, byte byte2, byte shiftFlag)
{
byte1 |= MSB;
byte2 |= MSB;
byte[] tmpByte = { byte1,byte2 };
char[] tmpChar = new char[1];
int i = 0,
tmpIndex = 0;
switch(shiftFlag) {
case SOFlag:
tmpIndex = curSODes;
tmpDecoder = SODecoder;
break;
case SS2Flag:
tmpIndex = curSS2Des;
tmpDecoder = SS2Decoder;
break;
case SS3Flag:
tmpIndex = curSS3Des;
tmpDecoder = SS3Decoder;
break;
}
if (tmpDecoder != null) {
for(i = 0; i < tmpDecoder.length; i++) {
if(tmpIndex == i) {
try {
ByteBuffer bb = ByteBuffer.wrap(tmpByte,0,2);
CharBuffer cc = CharBuffer.wrap(tmpChar,0,1);
tmpDecoder[i].decode(bb, cc, true);
cc.flip();
return cc.get();
} catch (Exception e) {}
}
}
}
return REPLACE_CHAR;
}
private int findDesig(byte[] in, int sp, int sl, byte[][] desigs) {
if (desigs == null) return -1;
int i = 0;
while (i < desigs.length) {
if (desigs[i] != null && sl - sp >= desigs[i].length) {
int j = 0;
while (j < desigs[i].length && in[sp+j] == desigs[i][j]) { j++; }
if (j == desigs[i].length)
return i;
}
i++;
}
return -1;
}
private int findDesigBuf(ByteBuffer in, byte[][] desigs) {
if (desigs == null) return -1;
int i = 0;
while (i < desigs.length) {
if (desigs[i] != null && in.remaining() >= desigs[i].length) {
int j = 0;
in.mark();
while (j < desigs[i].length && in.get() == desigs[i][j]) { j++; }
if (j == desigs[i].length)
return i;
in.reset();
}
i++;
}
return -1;
}
private CoderResult decodeArrayLoop(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);
int b1 = 0, b2 = 0, b3 = 0;
try {
while (sp < sl) {
b1 = sa[sp] & 0xff;
int inputSize = 1;
switch (b1) {
case ISO_SO:
shiftout = true;
inputSize = 1;
break;
case ISO_SI:
shiftout = false;
inputSize = 1;
break;
case ISO_ESC:
if (sl - sp - 1 < minDesignatorLength)
return CoderResult.UNDERFLOW;
int desig = findDesig(sa, sp + 1, sl, SODesig);
if (desig != -1) {
curSODes = desig;
inputSize = SODesig[desig].length + 1;
break;
}
desig = findDesig(sa, sp + 1, sl, SS2Desig);
if (desig != -1) {
curSS2Des = desig;
inputSize = SS2Desig[desig].length + 1;
break;
}
desig = findDesig(sa, sp + 1, sl, SS3Desig);
if (desig != -1) {
curSS3Des = desig;
inputSize = SS3Desig[desig].length + 1;
break;
}
if (sl - sp < 2)
return CoderResult.UNDERFLOW;
b1 = sa[sp + 1];
switch(b1) {
case ISO_SS2_7:
if (sl - sp < 4)
return CoderResult.UNDERFLOW;
b2 = sa[sp +2];
b3 = sa[sp +3];
if (dl - dp <1)
return CoderResult.OVERFLOW;
da[dp] = decode((byte)b2,
(byte)b3,
SS2Flag);
dp++;
inputSize = 4;
break;
case ISO_SS3_7:
if (sl - sp < 4)
return CoderResult.UNDERFLOW;
b2 = sa[sp + 2];
b3 = sa[sp + 3];
if (dl - dp <1)
return CoderResult.OVERFLOW;
da[dp] = decode((byte)b2,
(byte)b3,
SS3Flag);
dp++;
inputSize = 4;
break;
default:
return CoderResult.malformedForLength(2);
}
break;
default:
if (dl - dp < 1)
return CoderResult.OVERFLOW;
if (!shiftout) {
da[dp++]=(char)(sa[sp] & 0xff);
} else {
if (dl - dp < 1)
return CoderResult.OVERFLOW;
if (sl - sp < 2)
return CoderResult.UNDERFLOW;
b2 = sa[sp+1] & 0xff;
da[dp++] = decode((byte)b1,
(byte)b2,
SOFlag);
inputSize = 2;
}
break;
}
sp += inputSize;
}
return CoderResult.UNDERFLOW;
} finally {
src.position(sp - src.arrayOffset());
dst.position(dp - dst.arrayOffset());
}
}
private CoderResult decodeBufferLoop(ByteBuffer src,
CharBuffer dst)
{
int mark = src.position();
int b1 = 0, b2 = 0, b3 = 0;
try {
while (src.hasRemaining()) {
b1 = src.get();
int inputSize = 1;
switch (b1) {
case ISO_SO:
shiftout = true;
break;
case ISO_SI:
shiftout = false;
break;
case ISO_ESC:
if (src.remaining() < minDesignatorLength)
return CoderResult.UNDERFLOW;
int desig = findDesigBuf(src, SODesig);
if (desig != -1) {
curSODes = desig;
inputSize = SODesig[desig].length + 1;
break;
}
desig = findDesigBuf(src, SS2Desig);
if (desig != -1) {
curSS2Des = desig;
inputSize = SS2Desig[desig].length + 1;
break;
}
desig = findDesigBuf(src, SS3Desig);
if (desig != -1) {
curSS3Des = desig;
inputSize = SS3Desig[desig].length + 1;
break;
}
if (src.remaining() < 1)
return CoderResult.UNDERFLOW;
b1 = src.get();
switch(b1) {
case ISO_SS2_7:
if (src.remaining() < 2)
return CoderResult.UNDERFLOW;
b2 = src.get();
b3 = src.get();
if (dst.remaining() < 1)
return CoderResult.OVERFLOW;
dst.put(decode((byte)b2,
(byte)b3,
SS2Flag));
inputSize = 4;
break;
case ISO_SS3_7:
if (src.remaining() < 2)
return CoderResult.UNDERFLOW;
b2 = src.get();
b3 = src.get();
if (dst.remaining() < 1)
return CoderResult.OVERFLOW;
dst.put(decode((byte)b2,
(byte)b3,
SS3Flag));
inputSize = 4;
break;
default:
return CoderResult.malformedForLength(2);
}
break;
default:
if (dst.remaining() < 1)
return CoderResult.OVERFLOW;
if (!shiftout) {
dst.put((char)(b1 & 0xff));
} else {
if (dst.remaining() < 1)
return CoderResult.OVERFLOW;
if (src.remaining() < 1)
return CoderResult.UNDERFLOW;
b2 = src.get() & 0xff;
dst.put(decode((byte)b1,
(byte)b2,
SOFlag));
inputSize = 2;
}
break;
}
mark += inputSize;
}
return CoderResult.UNDERFLOW;
} catch (Exception e) { e.printStackTrace(); return CoderResult.OVERFLOW; }
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);
}
}
protected static class Encoder extends CharsetEncoder {
private final Surrogate.Parser sgp = new Surrogate.Parser();
public static final byte SS2 = (byte)0x8e;
public static final byte PLANE2 = (byte)0xA2;
public static final byte PLANE3 = (byte)0xA3;
private final byte MSB = (byte)0x80;
protected final byte maximumDesignatorLength = 4;
protected String SODesig,
SS2Desig = null,
SS3Desig = null;
protected CharsetEncoder ISOEncoder;
private boolean shiftout = false;
private boolean SODesDefined = false;
private boolean SS2DesDefined = false;
private boolean SS3DesDefined = false;
private boolean newshiftout = false;
private boolean newSODesDefined = false;
private boolean newSS2DesDefined = false;
private boolean newSS3DesDefined = false;
protected Encoder(Charset cs) {
super(cs, 4.0f, 8.0f);
}
public boolean canEncode(char c) {
return (ISOEncoder.canEncode(c));
}
protected void implReset() {
shiftout = false;
SODesDefined = false;
SS2DesDefined = false;
SS3DesDefined = false;
}
private int unicodeToNative(char unicode, byte ebyte[])
{
int index = 0;
byte tmpByte[];
char convChar[] = {unicode};
byte convByte[] = new byte[4];
int converted;
try{
CharBuffer cc = CharBuffer.wrap(convChar);
ByteBuffer bb = ByteBuffer.allocate(4);
ISOEncoder.encode(cc, bb, true);
bb.flip();
converted = bb.remaining();
bb.get(convByte,0,converted);
} catch(Exception e) {
return -1;
}
if (converted == 2) {
if (!SODesDefined) {
newSODesDefined = true;
ebyte[0] = ISO_ESC;
tmpByte = SODesig.getBytes();
System.arraycopy(tmpByte,0,ebyte,1,tmpByte.length);
index = tmpByte.length+1;
}
if (!shiftout) {
newshiftout = true;
ebyte[index++] = ISO_SO;
}
ebyte[index++] = (byte)(convByte[0] & 0x7f);
ebyte[index++] = (byte)(convByte[1] & 0x7f);
} else {
if(convByte[0] == SS2) {
if (convByte[1] == PLANE2) {
if (!SS2DesDefined) {
newSS2DesDefined = true;
ebyte[0] = ISO_ESC;
tmpByte = SS2Desig.getBytes();
System.arraycopy(tmpByte, 0, ebyte, 1, tmpByte.length);
index = tmpByte.length+1;
}
ebyte[index++] = ISO_ESC;
ebyte[index++] = ISO_SS2_7;
ebyte[index++] = (byte)(convByte[2] & 0x7f);
ebyte[index++] = (byte)(convByte[3] & 0x7f);
} else if (convByte[1] == PLANE3) {
if(!SS3DesDefined){
newSS3DesDefined = true;
ebyte[0] = ISO_ESC;
tmpByte = SS3Desig.getBytes();
System.arraycopy(tmpByte, 0, ebyte, 1, tmpByte.length);
index = tmpByte.length+1;
}
ebyte[index++] = ISO_ESC;
ebyte[index++] = ISO_SS3_7;
ebyte[index++] = (byte)(convByte[2] & 0x7f);
ebyte[index++] = (byte)(convByte[3] & 0x7f);
}
}
}
return index;
}
private CoderResult encodeArrayLoop(CharBuffer src,
ByteBuffer dst)
{
char[] sa = src.array();
int sp = src.arrayOffset() + src.position();
int sl = src.arrayOffset() + src.limit();
assert (sp <= sl);
sp = (sp <= sl ? sp : sl);
byte[] da = dst.array();
int dp = dst.arrayOffset() + dst.position();
int dl = dst.arrayOffset() + dst.limit();
assert (dp <= dl);
dp = (dp <= dl ? dp : dl);
int outputSize = 0;
byte[] outputByte = new byte[8];
newshiftout = shiftout;
newSODesDefined = SODesDefined;
newSS2DesDefined = SS2DesDefined;
newSS3DesDefined = SS3DesDefined;
try {
while (sp < sl) {
char c = sa[sp];
if (Character.isSurrogate(c)) {
if (sgp.parse(c, sa, sp, sl) < 0)
return sgp.error();
return sgp.unmappableResult();
}
if (c < 0x80) { // ASCII
if (shiftout){
newshiftout = false;
outputSize = 2;
outputByte[0] = ISO_SI;
outputByte[1] = (byte)(c & 0x7f);
} else {
outputSize = 1;
outputByte[0] = (byte)(c & 0x7f);
}
if(sa[sp] == '\n'){
newSODesDefined = false;
newSS2DesDefined = false;
newSS3DesDefined = false;
}
} else {
outputSize = unicodeToNative(c, outputByte);
if (outputSize == 0) {
return CoderResult.unmappableForLength(1);
}
}
if (dl - dp < outputSize)
return CoderResult.OVERFLOW;
for (int i = 0; i < outputSize; i++)
da[dp++] = outputByte[i];
sp++;
shiftout = newshiftout;
SODesDefined = newSODesDefined;
SS2DesDefined = newSS2DesDefined;
SS3DesDefined = newSS3DesDefined;
}
return CoderResult.UNDERFLOW;
} finally {
src.position(sp - src.arrayOffset());
dst.position(dp - dst.arrayOffset());
}
}
private CoderResult encodeBufferLoop(CharBuffer src,
ByteBuffer dst)
{
int outputSize = 0;
byte[] outputByte = new byte[8];
int inputSize = 0; // Size of input
newshiftout = shiftout;
newSODesDefined = SODesDefined;
newSS2DesDefined = SS2DesDefined;
newSS3DesDefined = SS3DesDefined;
int mark = src.position();
try {
while (src.hasRemaining()) {
char inputChar = src.get();
if (Character.isSurrogate(inputChar)) {
if (sgp.parse(inputChar, src) < 0)
return sgp.error();
return sgp.unmappableResult();
}
if (inputChar < 0x80) { // ASCII
if (shiftout){
newshiftout = false;
outputSize = 2;
outputByte[0] = ISO_SI;
outputByte[1] = (byte)(inputChar & 0x7f);
} else {
outputSize = 1;
outputByte[0] = (byte)(inputChar & 0x7f);
}
if(inputChar == '\n'){
newSODesDefined = false;
newSS2DesDefined = false;
newSS3DesDefined = false;
}
} else {
outputSize = unicodeToNative(inputChar, outputByte);
if (outputSize == 0) {
return CoderResult.unmappableForLength(1);
}
}
if (dst.remaining() < outputSize)
return CoderResult.OVERFLOW;
for (int i = 0; i < outputSize; i++)
dst.put(outputByte[i]);
mark++;
shiftout = newshiftout;
SODesDefined = newSODesDefined;
SS2DesDefined = newSS2DesDefined;
SS3DesDefined = newSS3DesDefined;
}
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);
}
}
}
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