Back to index...

	/*
	* Copyright (c) 2009, 2013, 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.util.Arrays;
	import sun.nio.cs.Surrogate;
	import sun.nio.cs.ArrayDecoder;
	import sun.nio.cs.ArrayEncoder;
	import static sun.nio.cs.CharsetMapping.*;

	/*
	* Four types of "DoubleByte" charsets are implemented in this class
	* (1)DoubleByte
	* The "mostly widely used" multibyte charset, a combination of
	* a singlebyte character set (usually the ASCII charset) and a
	* doublebyte character set. The codepoint values of singlebyte
	* and doublebyte don't overlap. Microsoft's multibyte charsets
	* and IBM's "DBCS_ASCII" charsets, such as IBM1381, 942, 943,
	* 948, 949 and 950 are such charsets.
	*
	* (2)DoubleByte_EBCDIC
	* IBM EBCDIC Mix multibyte charset. Use SO and SI to shift (switch)
	* in and out between the singlebyte character set and doublebyte
	* character set.
	*
	* (3)DoubleByte_SIMPLE_EUC
	* It's a "simple" form of EUC encoding scheme, only have the
	* singlebyte character set G0 and one doublebyte character set
	* G1 are defined, G2 (with SS2) and G3 (with SS3) are not used.
	* So it is actually the same as the "typical" type (1) mentioned
	* above, except it return "malformed" for the SS2 and SS3 when
	* decoding.
	*
	* (4)DoubleByte ONLY
	* A "pure" doublebyte only character set. From implementation
	* point of view, this is the type (1) with "decodeSingle" always
	* returns unmappable.
	*
	* For simplicity, all implementations share the same decoding and
	* encoding data structure.
	*
	* Decoding:
	*
	* char[][] b2c;
	* char[] b2cSB;
	* int b2Min, b2Max
	*
	* public char decodeSingle(int b) {
	* return b2cSB.[b];
	* }
	*
	* public char decodeDouble(int b1, int b2) {
	* if (b2 < b2Min \|\| b2 > b2Max)
	* return UNMAPPABLE_DECODING;
	* return b2c[b1][b2 - b2Min];
	* }
	*
	* (1)b2Min, b2Max are the corresponding min and max value of the
	* low-half of the double-byte.
	* (2)The high 8-bit/b1 of the double-byte are used to indexed into
	* b2c array.
	*
	* Encoding:
	*
	* char[] c2b;
	* char[] c2bIndex;
	*
	* public int encodeChar(char ch) {
	* return c2b[c2bIndex[ch >> 8] + (ch & 0xff)];
	* }
	*
	*/

	public class DoubleByte {

	public final static char[] B2C_UNMAPPABLE;
	static {
	B2C_UNMAPPABLE = new char[0x100];
	Arrays.fill(B2C_UNMAPPABLE, UNMAPPABLE_DECODING);
	}

	public static class Decoder extends CharsetDecoder
	implements DelegatableDecoder, ArrayDecoder
	{
	final char[][] b2c;
	final char[] b2cSB;
	final int b2Min;
	final int b2Max;

	// for SimpleEUC override
	protected CoderResult crMalformedOrUnderFlow(int b) {
	return CoderResult.UNDERFLOW;
	}

	protected CoderResult crMalformedOrUnmappable(int b1, int b2) {
	if (b2c[b1] == B2C_UNMAPPABLE \|\| // isNotLeadingByte(b1)
	b2c[b2] != B2C_UNMAPPABLE \|\| // isLeadingByte(b2)
	decodeSingle(b2) != UNMAPPABLE_DECODING) { // isSingle(b2)
	return CoderResult.malformedForLength(1);
	}
	return CoderResult.unmappableForLength(2);
	}

	Decoder(Charset cs, float avgcpb, float maxcpb,
	char[][] b2c, char[] b2cSB,
	int b2Min, int b2Max) {
	super(cs, avgcpb, maxcpb);
	this.b2c = b2c;
	this.b2cSB = b2cSB;
	this.b2Min = b2Min;
	this.b2Max = b2Max;
	}

	Decoder(Charset cs, char[][] b2c, char[] b2cSB, int b2Min, int b2Max) {
	this(cs, 0.5f, 1.0f, b2c, b2cSB, b2Min, b2Max);
	}

	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 && dp < dl) {
	// inline the decodeSingle/Double() for better performance
	int inSize = 1;
	int b1 = sa[sp] & 0xff;
	char c = b2cSB[b1];
	if (c == UNMAPPABLE_DECODING) {
	if (sl - sp < 2)
	return crMalformedOrUnderFlow(b1);
	int b2 = sa[sp + 1] & 0xff;
	if (b2 < b2Min \|\| b2 > b2Max \|\|
	(c = b2c[b1][b2 - b2Min]) == UNMAPPABLE_DECODING) {
	return crMalformedOrUnmappable(b1, b2);
	}
	inSize++;
	}
	da[dp++] = c;
	sp += inSize;
	}
	return (sp >= sl) ? CoderResult.UNDERFLOW
	: CoderResult.OVERFLOW;
	} 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() && dst.hasRemaining()) {
	int b1 = src.get() & 0xff;
	char c = b2cSB[b1];
	int inSize = 1;
	if (c == UNMAPPABLE_DECODING) {
	if (src.remaining() < 1)
	return crMalformedOrUnderFlow(b1);
	int b2 = src.get() & 0xff;
	if (b2 < b2Min \|\| b2 > b2Max \|\|
	(c = b2c[b1][b2 - b2Min]) == UNMAPPABLE_DECODING)
	return crMalformedOrUnmappable(b1, b2);
	inSize++;
	}
	dst.put(c);
	mark += inSize;
	}
	return src.hasRemaining()? CoderResult.OVERFLOW
	: CoderResult.UNDERFLOW;
	} finally {
	src.position(mark);
	}
	}

	// Make some protected methods public for use by JISAutoDetect
	public CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {
	if (src.hasArray() && dst.hasArray())
	return decodeArrayLoop(src, dst);
	else
	return decodeBufferLoop(src, dst);
	}

	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 = b2cSB[b1];
	if (c == UNMAPPABLE_DECODING) {
	if (sp < sl) {
	int b2 = src[sp++] & 0xff;
	if (b2 < b2Min \|\| b2 > b2Max \|\|
	(c = b2c[b1][b2 - b2Min]) == UNMAPPABLE_DECODING) {
	if (b2c[b1] == B2C_UNMAPPABLE \|\| // isNotLeadingByte
	b2c[b2] != B2C_UNMAPPABLE \|\| // isLeadingByte
	decodeSingle(b2) != UNMAPPABLE_DECODING) {
	sp--;
	}
	}
	}
	if (c == UNMAPPABLE_DECODING) {
	c = repl;
	}
	}
	dst[dp++] = c;
	}
	return dp;
	}

	public void implReset() {
	super.implReset();
	}

	public CoderResult implFlush(CharBuffer out) {
	return super.implFlush(out);
	}

	// decode loops are not using decodeSingle/Double() for performance
	// reason.
	public char decodeSingle(int b) {
	return b2cSB[b];
	}

	public char decodeDouble(int b1, int b2) {
	if (b1 < 0 \|\| b1 > b2c.length \|\|
	b2 < b2Min \|\| b2 > b2Max)
	return UNMAPPABLE_DECODING;
	return b2c[b1][b2 - b2Min];
	}
	}

	// IBM_EBCDIC_DBCS
	public static class Decoder_EBCDIC extends Decoder {
	private static final int SBCS = 0;
	private static final int DBCS = 1;
	private static final int SO = 0x0e;
	private static final int SI = 0x0f;
	private int currentState;

	Decoder_EBCDIC(Charset cs,
	char[][] b2c, char[] b2cSB, int b2Min, int b2Max) {
	super(cs, b2c, b2cSB, b2Min, b2Max);
	}

	public void implReset() {
	currentState = SBCS;
	}

	// Check validity of dbcs ebcdic byte pair values
	//
	// First byte : 0x41 -- 0xFE
	// Second byte: 0x41 -- 0xFE
	// Doublebyte blank: 0x4040
	//
	// The validation implementation in "old" DBCS_IBM_EBCDIC and sun.io
	// as
	// if ((b1 != 0x40 \|\| b2 != 0x40) &&
	// (b2 < 0x41 \|\| b2 > 0xfe)) {...}
	// is not correct/complete (range check for b1)
	//
	private static boolean isDoubleByte(int b1, int b2) {
	return (0x41 <= b1 && b1 <= 0xfe && 0x41 <= b2 && b2 <= 0xfe)
	\|\| (b1 == 0x40 && b2 == 0x40); // DBCS-HOST SPACE
	}

	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 {
	// don't check dp/dl together here, it's possible to
	// decdoe a SO/SI without space in output buffer.
	while (sp < sl) {
	int b1 = sa[sp] & 0xff;
	int inSize = 1;
	if (b1 == SO) { // Shift out
	if (currentState != SBCS)
	return CoderResult.malformedForLength(1);
	else
	currentState = DBCS;
	} else if (b1 == SI) {
	if (currentState != DBCS)
	return CoderResult.malformedForLength(1);
	else
	currentState = SBCS;
	} else {
	char c = UNMAPPABLE_DECODING;
	if (currentState == SBCS) {
	c = b2cSB[b1];
	if (c == UNMAPPABLE_DECODING)
	return CoderResult.unmappableForLength(1);
	} else {
	if (sl - sp < 2)
	return CoderResult.UNDERFLOW;
	int b2 = sa[sp + 1] & 0xff;
	if (b2 < b2Min \|\| b2 > b2Max \|\|
	(c = b2c[b1][b2 - b2Min]) == UNMAPPABLE_DECODING) {
	if (!isDoubleByte(b1, b2))
	return CoderResult.malformedForLength(2);
	return CoderResult.unmappableForLength(2);
	}
	inSize++;
	}
	if (dl - dp < 1)
	return CoderResult.OVERFLOW;

	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()) {
	int b1 = src.get() & 0xff;
	int inSize = 1;
	if (b1 == SO) { // Shift out
	if (currentState != SBCS)
	return CoderResult.malformedForLength(1);
	else
	currentState = DBCS;
	} else if (b1 == SI) {
	if (currentState != DBCS)
	return CoderResult.malformedForLength(1);
	else
	currentState = SBCS;
	} else {
	char c = UNMAPPABLE_DECODING;
	if (currentState == SBCS) {
	c = b2cSB[b1];
	if (c == UNMAPPABLE_DECODING)
	return CoderResult.unmappableForLength(1);
	} else {
	if (src.remaining() < 1)
	return CoderResult.UNDERFLOW;
	int b2 = src.get()&0xff;
	if (b2 < b2Min \|\| b2 > b2Max \|\|
	(c = b2c[b1][b2 - b2Min]) == UNMAPPABLE_DECODING) {
	if (!isDoubleByte(b1, b2))
	return CoderResult.malformedForLength(2);
	return CoderResult.unmappableForLength(2);
	}
	inSize++;
	}

	if (dst.remaining() < 1)
	return CoderResult.OVERFLOW;

	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;
	currentState = SBCS;
	char repl = replacement().charAt(0);
	while (sp < sl) {
	int b1 = src[sp++] & 0xff;
	if (b1 == SO) { // Shift out
	if (currentState != SBCS)
	dst[dp++] = repl;
	else
	currentState = DBCS;
	} else if (b1 == SI) {
	if (currentState != DBCS)
	dst[dp++] = repl;
	else
	currentState = SBCS;
	} else {
	char c = UNMAPPABLE_DECODING;
	if (currentState == SBCS) {
	c = b2cSB[b1];
	if (c == UNMAPPABLE_DECODING)
	c = repl;
	} else {
	if (sl == sp) {
	c = repl;
	} else {
	int b2 = src[sp++] & 0xff;
	if (b2 < b2Min \|\| b2 > b2Max \|\|
	(c = b2c[b1][b2 - b2Min]) == UNMAPPABLE_DECODING) {
	c = repl;
	}
	}
	}
	dst[dp++] = c;
	}
	}
	return dp;
	}
	}

	// DBCS_ONLY
	public static class Decoder_DBCSONLY extends Decoder {
	static final char[] b2cSB_UNMAPPABLE;
	static {
	b2cSB_UNMAPPABLE = new char[0x100];
	Arrays.fill(b2cSB_UNMAPPABLE, UNMAPPABLE_DECODING);
	}
	Decoder_DBCSONLY(Charset cs, char[][] b2c, char[] b2cSB, int b2Min, int b2Max) {
	super(cs, 0.5f, 1.0f, b2c, b2cSB_UNMAPPABLE, b2Min, b2Max);
	}
	}

	// EUC_SIMPLE
	// The only thing we need to "override" is to check SS2/SS3 and
	// return "malformed" if found
	public static class Decoder_EUC_SIM extends Decoder {
	private final int SS2 = 0x8E;
	private final int SS3 = 0x8F;

	Decoder_EUC_SIM(Charset cs,
	char[][] b2c, char[] b2cSB, int b2Min, int b2Max) {
	super(cs, b2c, b2cSB, b2Min, b2Max);
	}

	// No support provided for G2/G3 for SimpleEUC
	protected CoderResult crMalformedOrUnderFlow(int b) {
	if (b == SS2 \|\| b == SS3 )
	return CoderResult.malformedForLength(1);
	return CoderResult.UNDERFLOW;
	}

	protected CoderResult crMalformedOrUnmappable(int b1, int b2) {
	if (b1 == SS2 \|\| b1 == SS3 )
	return CoderResult.malformedForLength(1);
	return CoderResult.unmappableForLength(2);
	}

	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 = b2cSB[b1];
	if (c == UNMAPPABLE_DECODING) {
	if (sp < sl) {
	int b2 = src[sp++] & 0xff;
	if (b2 < b2Min \|\| b2 > b2Max \|\|
	(c = b2c[b1][b2 - b2Min]) == UNMAPPABLE_DECODING) {
	if (b1 == SS2 \|\| b1 == SS3) {
	sp--;
	}
	c = repl;
	}
	} else {
	c = repl;
	}
	}
	dst[dp++] = c;
	}
	return dp;
	}
	}

	public static class Encoder extends CharsetEncoder
	implements ArrayEncoder
	{
	final int MAX_SINGLEBYTE = 0xff;
	private final char[] c2b;
	private final char[] c2bIndex;
	Surrogate.Parser sgp;

	protected Encoder(Charset cs, char[] c2b, char[] c2bIndex) {
	super(cs, 2.0f, 2.0f);
	this.c2b = c2b;
	this.c2bIndex = c2bIndex;
	}

	Encoder(Charset cs, float avg, float max, byte[] repl, char[] c2b, char[] c2bIndex) {
	super(cs, avg, max, repl);
	this.c2b = c2b;
	this.c2bIndex = c2bIndex;
	}

	public boolean canEncode(char c) {
	return encodeChar(c) != UNMAPPABLE_ENCODING;
	}

	Surrogate.Parser sgp() {
	if (sgp == null)
	sgp = new Surrogate.Parser();
	return sgp;
	}

	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 bb = encodeChar(c);
	if (bb == UNMAPPABLE_ENCODING) {
	if (Character.isSurrogate(c)) {
	if (sgp().parse(c, sa, sp, sl) < 0)
	return sgp.error();
	return sgp.unmappableResult();
	}
	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++;
	}
	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()) {
	char c = src.get();
	int bb = encodeChar(c);
	if (bb == UNMAPPABLE_ENCODING) {
	if (Character.isSurrogate(c)) {
	if (sgp().parse(c, src) < 0)
	return sgp.error();
	return sgp.unmappableResult();
	}
	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++;
	}
	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);
	}

	protected 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;
	int dl = dst.length;
	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])) {
	sp++;
	}
	dst[dp++] = repl[0];
	if (repl.length > 1)
	dst[dp++] = repl[1];
	continue;
	} //else
	if (bb > MAX_SINGLEBYTE) { // DoubleByte
	dst[dp++] = (byte)(bb >> 8);
	dst[dp++] = (byte)bb;
	} else { // SingleByte
	dst[dp++] = (byte)bb;
	}

	}
	return dp;
	}

	public int encodeChar(char ch) {
	return c2b[c2bIndex[ch >> 8] + (ch & 0xff)];
	}

	// init the c2b and c2bIndex tables from b2c.
	static void initC2B(String[] b2c, String b2cSB, String b2cNR, String c2bNR,
	int b2Min, int b2Max,
	char[] c2b, char[] c2bIndex)
	{
	Arrays.fill(c2b, (char)UNMAPPABLE_ENCODING);
	int off = 0x100;

	char[][] b2c_ca = new char[b2c.length][];
	char[] b2cSB_ca = null;
	if (b2cSB != null)
	b2cSB_ca = b2cSB.toCharArray();

	for (int i = 0; i < b2c.length; i++) {
	if (b2c[i] == null)
	continue;
	b2c_ca[i] = b2c[i].toCharArray();
	}

	if (b2cNR != null) {
	int j = 0;
	while (j < b2cNR.length()) {
	char b = b2cNR.charAt(j++);
	char c = b2cNR.charAt(j++);
	if (b < 0x100 && b2cSB_ca != null) {
	if (b2cSB_ca[b] == c)
	b2cSB_ca[b] = UNMAPPABLE_DECODING;
	} else {
	if (b2c_ca[b >> 8][(b & 0xff) - b2Min] == c)
	b2c_ca[b >> 8][(b & 0xff) - b2Min] = UNMAPPABLE_DECODING;
	}
	}
	}

	if (b2cSB_ca != null) { // SingleByte
	for (int b = 0; b < b2cSB_ca.length; b++) {
	char c = b2cSB_ca[b];
	if (c == UNMAPPABLE_DECODING)
	continue;
	int index = c2bIndex[c >> 8];
	if (index == 0) {
	index = off;
	off += 0x100;
	c2bIndex[c >> 8] = (char)index;
	}
	c2b[index + (c & 0xff)] = (char)b;
	}
	}

	for (int b1 = 0; b1 < b2c.length; b1++) { // DoubleByte
	char[] db = b2c_ca[b1];
	if (db == null)
	continue;
	for (int b2 = b2Min; b2 <= b2Max; b2++) {
	char c = db[b2 - b2Min];
	if (c == UNMAPPABLE_DECODING)
	continue;
	int index = c2bIndex[c >> 8];
	if (index == 0) {
	index = off;
	off += 0x100;
	c2bIndex[c >> 8] = (char)index;
	}
	c2b[index + (c & 0xff)] = (char)((b1 << 8) \| b2);
	}
	}

	if (c2bNR != null) {
	// add c->b only nr entries
	for (int i = 0; i < c2bNR.length(); i += 2) {
	char b = c2bNR.charAt(i);
	char c = c2bNR.charAt(i + 1);
	int index = (c >> 8);
	if (c2bIndex[index] == 0) {
	c2bIndex[index] = (char)off;
	off += 0x100;
	}
	index = c2bIndex[index] + (c & 0xff);
	c2b[index] = b;
	}
	}
	}
	}

	public static class Encoder_DBCSONLY extends Encoder {
	Encoder_DBCSONLY(Charset cs, byte[] repl,
	char[] c2b, char[] c2bIndex) {
	super(cs, 2.0f, 2.0f, repl, c2b, c2bIndex);
	}

	public int encodeChar(char ch) {
	int bb = super.encodeChar(ch);
	if (bb <= MAX_SINGLEBYTE)
	return UNMAPPABLE_ENCODING;
	return bb;
	}
	}



	public static class Encoder_EBCDIC extends Encoder {
	static final int SBCS = 0;
	static final int DBCS = 1;
	static final byte SO = 0x0e;
	static final byte SI = 0x0f;

	protected int currentState = SBCS;

	Encoder_EBCDIC(Charset cs, char[] c2b, char[] c2bIndex) {
	super(cs, 4.0f, 5.0f, new byte[] {(byte)0x6f}, c2b, c2bIndex);
	}

	protected void implReset() {
	currentState = SBCS;
	}

	protected CoderResult implFlush(ByteBuffer out) {
	if (currentState == DBCS) {
	if (out.remaining() < 1)
	return CoderResult.OVERFLOW;
	out.put(SI);
	}
	implReset();
	return CoderResult.UNDERFLOW;
	}

	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 bb = encodeChar(c);
	if (bb == UNMAPPABLE_ENCODING) {
	if (Character.isSurrogate(c)) {
	if (sgp().parse(c, sa, sp, sl) < 0)
	return sgp.error();
	return sgp.unmappableResult();
	}
	return CoderResult.unmappableForLength(1);
	}
	if (bb > MAX_SINGLEBYTE) { // DoubleByte
	if (currentState == SBCS) {
	if (dl - dp < 1)
	return CoderResult.OVERFLOW;
	currentState = DBCS;
	da[dp++] = SO;
	}
	if (dl - dp < 2)
	return CoderResult.OVERFLOW;
	da[dp++] = (byte)(bb >> 8);
	da[dp++] = (byte)bb;
	} else { // SingleByte
	if (currentState == DBCS) {
	if (dl - dp < 1)
	return CoderResult.OVERFLOW;
	currentState = SBCS;
	da[dp++] = SI;
	}
	if (dl - dp < 1)
	return CoderResult.OVERFLOW;
	da[dp++] = (byte)bb;

	}
	sp++;
	}
	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()) {
	char c = src.get();
	int bb = encodeChar(c);
	if (bb == UNMAPPABLE_ENCODING) {
	if (Character.isSurrogate(c)) {
	if (sgp().parse(c, src) < 0)
	return sgp.error();
	return sgp.unmappableResult();
	}
	return CoderResult.unmappableForLength(1);
	}
	if (bb > MAX_SINGLEBYTE) { // DoubleByte
	if (currentState == SBCS) {
	if (dst.remaining() < 1)
	return CoderResult.OVERFLOW;
	currentState = DBCS;
	dst.put(SO);
	}
	if (dst.remaining() < 2)
	return CoderResult.OVERFLOW;
	dst.put((byte)(bb >> 8));
	dst.put((byte)(bb));
	} else { // Single-byte
	if (currentState == DBCS) {
	if (dst.remaining() < 1)
	return CoderResult.OVERFLOW;
	currentState = SBCS;
	dst.put(SI);
	}
	if (dst.remaining() < 1)
	return CoderResult.OVERFLOW;
	dst.put((byte)bb);
	}
	mark++;
	}
	return CoderResult.UNDERFLOW;
	} finally {
	src.position(mark);
	}
	}

	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])) {
	sp++;
	}
	dst[dp++] = repl[0];
	if (repl.length > 1)
	dst[dp++] = repl[1];
	continue;
	} //else
	if (bb > MAX_SINGLEBYTE) { // DoubleByte
	if (currentState == SBCS) {
	currentState = DBCS;
	dst[dp++] = SO;
	}
	dst[dp++] = (byte)(bb >> 8);
	dst[dp++] = (byte)bb;
	} else { // SingleByte
	if (currentState == DBCS) {
	currentState = SBCS;
	dst[dp++] = SI;
	}
	dst[dp++] = (byte)bb;
	}
	}

	if (currentState == DBCS) {
	currentState = SBCS;
	dst[dp++] = SI;
	}
	return dp;
	}
	}

	// EUC_SIMPLE
	public static class Encoder_EUC_SIM extends Encoder {
	Encoder_EUC_SIM(Charset cs, char[] c2b, char[] c2bIndex) {
	super(cs, c2b, c2bIndex);
	}
	}

	}

Back to index...