Java example source code file (HKSCS.java)
The HKSCS.java Java example source code/*
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* 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.
*
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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.util.Arrays;
import sun.nio.cs.Surrogate;
import static sun.nio.cs.CharsetMapping.*;
public class HKSCS {
public static class Decoder extends DoubleByte.Decoder {
static int b2Min = 0x40;
static int b2Max = 0xfe;
private char[][] b2cBmp;
private char[][] b2cSupp;
private DoubleByte.Decoder big5Dec;
protected Decoder(Charset cs,
DoubleByte.Decoder big5Dec,
char[][] b2cBmp, char[][] b2cSupp)
{
// super(cs, 0.5f, 1.0f);
// need to extends DoubleByte.Decoder so the
// sun.io can use it. this implementation
super(cs, 0.5f, 1.0f, null, null, 0, 0);
this.big5Dec = big5Dec;
this.b2cBmp = b2cBmp;
this.b2cSupp = b2cSupp;
}
public char decodeSingle(int b) {
return big5Dec.decodeSingle(b);
}
public char decodeBig5(int b1, int b2) {
return big5Dec.decodeDouble(b1, b2);
}
public char decodeDouble(int b1, int b2) {
return b2cBmp[b1][b2 - b2Min];
}
public char decodeDoubleEx(int b1, int b2) {
/* if the b2cSupp is null, the subclass need
to override the methold
if (b2cSupp == null)
return UNMAPPABLE_DECODING;
*/
return b2cSupp[b1][b2 - b2Min];
}
protected 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();
try {
while (sp < sl) {
int b1 = sa[sp] & 0xff;
char c = decodeSingle(b1);
int inSize = 1, outSize = 1;
char[] cc = null;
if (c == UNMAPPABLE_DECODING) {
if (sl - sp < 2)
return CoderResult.UNDERFLOW;
int b2 = sa[sp + 1] & 0xff;
inSize++;
if (b2 < b2Min || b2 > b2Max)
return CoderResult.unmappableForLength(2);
c = decodeDouble(b1, b2); //bmp
if (c == UNMAPPABLE_DECODING) {
c = decodeDoubleEx(b1, b2); //supp
if (c == UNMAPPABLE_DECODING) {
c = decodeBig5(b1, b2); //big5
if (c == UNMAPPABLE_DECODING)
return CoderResult.unmappableForLength(2);
} else {
// supplementary character in u+2xxxx area
outSize = 2;
}
}
}
if (dl - dp < outSize)
return CoderResult.OVERFLOW;
if (outSize == 2) {
// supplementary characters
da[dp++] = Surrogate.high(0x20000 + c);
da[dp++] = Surrogate.low(0x20000 + c);
} else {
da[dp++] = c;
}
sp += inSize;
}
return CoderResult.UNDERFLOW;
} finally {
src.position(sp - src.arrayOffset());
dst.position(dp - dst.arrayOffset());
}
}
protected CoderResult decodeBufferLoop(ByteBuffer src, CharBuffer dst) {
int mark = src.position();
try {
while (src.hasRemaining()) {
char[] cc = null;
int b1 = src.get() & 0xff;
int inSize = 1, outSize = 1;
char c = decodeSingle(b1);
if (c == UNMAPPABLE_DECODING) {
if (src.remaining() < 1)
return CoderResult.UNDERFLOW;
int b2 = src.get() & 0xff;
inSize++;
if (b2 < b2Min || b2 > b2Max)
return CoderResult.unmappableForLength(2);
c = decodeDouble(b1, b2); //bmp
if (c == UNMAPPABLE_DECODING) {
c = decodeDoubleEx(b1, b2); //supp
if (c == UNMAPPABLE_DECODING) {
c = decodeBig5(b1, b2); //big5
if (c == UNMAPPABLE_DECODING)
return CoderResult.unmappableForLength(2);
} else {
outSize = 2;
}
}
}
if (dst.remaining() < outSize)
return CoderResult.OVERFLOW;
if (outSize == 2) {
dst.put(Surrogate.high(0x20000 + c));
dst.put(Surrogate.low(0x20000 + c));
} else {
dst.put(c);
}
mark += inSize;
}
return CoderResult.UNDERFLOW;
} finally {
src.position(mark);
}
}
public int decode(byte[] src, int sp, int len, char[] dst) {
int dp = 0;
int sl = sp + len;
char repl = replacement().charAt(0);
while (sp < sl) {
int b1 = src[sp++] & 0xff;
char c = decodeSingle(b1);
if (c == UNMAPPABLE_DECODING) {
if (sl == sp) {
c = repl;
} else {
int b2 = src[sp++] & 0xff;
if (b2 < b2Min || b2 > b2Max) {
c = repl;
} else if ((c = decodeDouble(b1, b2)) == UNMAPPABLE_DECODING) {
c = decodeDoubleEx(b1, b2); //supp
if (c == UNMAPPABLE_DECODING) {
c = decodeBig5(b1, b2); //big5
if (c == UNMAPPABLE_DECODING)
c = repl;
} else {
// supplementary character in u+2xxxx area
dst[dp++] = Surrogate.high(0x20000 + c);
dst[dp++] = Surrogate.low(0x20000 + c);
continue;
}
}
}
}
dst[dp++] = c;
}
return dp;
}
public CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {
if (src.hasArray() && dst.hasArray())
return decodeArrayLoop(src, dst);
else
return decodeBufferLoop(src, dst);
}
static void initb2c(char[][]b2c, String[] b2cStr)
{
for (int i = 0; i < b2cStr.length; i++) {
if (b2cStr[i] == null)
b2c[i] = DoubleByte.B2C_UNMAPPABLE;
else
b2c[i] = b2cStr[i].toCharArray();
}
}
}
public static class Encoder extends DoubleByte.Encoder {
private DoubleByte.Encoder big5Enc;
private char[][] c2bBmp;
private char[][] c2bSupp;
protected Encoder(Charset cs,
DoubleByte.Encoder big5Enc,
char[][] c2bBmp,
char[][] c2bSupp)
{
super(cs, null, null);
this.big5Enc = big5Enc;
this.c2bBmp = c2bBmp;
this.c2bSupp = c2bSupp;
}
public int encodeBig5(char ch) {
return big5Enc.encodeChar(ch);
}
public int encodeChar(char ch) {
int bb = c2bBmp[ch >> 8][ch & 0xff];
if (bb == UNMAPPABLE_ENCODING)
return encodeBig5(ch);
return bb;
}
public int encodeSupp(int cp) {
if ((cp & 0xf0000) != 0x20000)
return UNMAPPABLE_ENCODING;
return c2bSupp[(cp >> 8) & 0xff][cp & 0xff];
}
public boolean canEncode(char c) {
return encodeChar(c) != UNMAPPABLE_ENCODING;
}
protected 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];
int inSize = 1;
int bb = encodeChar(c);
if (bb == UNMAPPABLE_ENCODING) {
if (Character.isSurrogate(c)) {
int cp;
if ((cp = sgp().parse(c, sa, sp, sl)) < 0)
return sgp.error();
bb = encodeSupp(cp);
if (bb == UNMAPPABLE_ENCODING)
return CoderResult.unmappableForLength(2);
inSize = 2;
} else {
return CoderResult.unmappableForLength(1);
}
}
if (bb > MAX_SINGLEBYTE) { // DoubleByte
if (dl - dp < 2)
return CoderResult.OVERFLOW;
da[dp++] = (byte)(bb >> 8);
da[dp++] = (byte)bb;
} else { // SingleByte
if (dl - dp < 1)
return CoderResult.OVERFLOW;
da[dp++] = (byte)bb;
}
sp += inSize;
}
return CoderResult.UNDERFLOW;
} finally {
src.position(sp - src.arrayOffset());
dst.position(dp - dst.arrayOffset());
}
}
protected CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {
int mark = src.position();
try {
while (src.hasRemaining()) {
int inSize = 1;
char c = src.get();
int bb = encodeChar(c);
if (bb == UNMAPPABLE_ENCODING) {
if (Character.isSurrogate(c)) {
int cp;
if ((cp = sgp().parse(c, src)) < 0)
return sgp.error();
bb = encodeSupp(cp);
if (bb == UNMAPPABLE_ENCODING)
return CoderResult.unmappableForLength(2);
inSize = 2;
} else {
return CoderResult.unmappableForLength(1);
}
}
if (bb > MAX_SINGLEBYTE) { // DoubleByte
if (dst.remaining() < 2)
return CoderResult.OVERFLOW;
dst.put((byte)(bb >> 8));
dst.put((byte)(bb));
} else {
if (dst.remaining() < 1)
return CoderResult.OVERFLOW;
dst.put((byte)bb);
}
mark += inSize;
}
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 byte[] repl = replacement();
protected void implReplaceWith(byte[] newReplacement) {
repl = newReplacement;
}
public int encode(char[] src, int sp, int len, byte[] dst) {
int dp = 0;
int sl = sp + len;
while (sp < sl) {
char c = src[sp++];
int bb = encodeChar(c);
if (bb == UNMAPPABLE_ENCODING) {
if (!Character.isHighSurrogate(c) || sp == sl ||
!Character.isLowSurrogate(src[sp]) ||
(bb = encodeSupp(Character.toCodePoint(c, src[sp++])))
== UNMAPPABLE_ENCODING) {
dst[dp++] = repl[0];
if (repl.length > 1)
dst[dp++] = repl[1];
continue;
}
sp++;
}
if (bb > MAX_SINGLEBYTE) { // DoubleByte
dst[dp++] = (byte)(bb >> 8);
dst[dp++] = (byte)bb;
} else { // SingleByte
dst[dp++] = (byte)bb;
}
}
return dp;
}
static char[] C2B_UNMAPPABLE = new char[0x100];
static {
Arrays.fill(C2B_UNMAPPABLE, (char)UNMAPPABLE_ENCODING);
}
static void initc2b(char[][] c2b, String[] b2cStr, String pua) {
// init c2b/c2bSupp from b2cStr and supp
int b2Min = 0x40;
Arrays.fill(c2b, C2B_UNMAPPABLE);
for (int b1 = 0; b1 < 0x100; b1++) {
String s = b2cStr[b1];
if (s == null)
continue;
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
int hi = c >> 8;
if (c2b[hi] == C2B_UNMAPPABLE) {
c2b[hi] = new char[0x100];
Arrays.fill(c2b[hi], (char)UNMAPPABLE_ENCODING);
}
c2b[hi][c & 0xff] = (char)((b1 << 8) | (i + b2Min));
}
}
if (pua != null) { // add the compatibility pua entries
char c = '\ue000'; //first pua character
for (int i = 0; i < pua.length(); i++) {
char bb = pua.charAt(i);
if (bb != UNMAPPABLE_DECODING) {
int hi = c >> 8;
if (c2b[hi] == C2B_UNMAPPABLE) {
c2b[hi] = new char[0x100];
Arrays.fill(c2b[hi], (char)UNMAPPABLE_ENCODING);
}
c2b[hi][c & 0xff] = bb;
}
c++;
}
}
}
}
}
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