/*
* 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
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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.CharsetEncoder;
import java.nio.charset.CoderResult;
import sun.nio.cs.Surrogate;
/**
* An abstract base class for subclasses which encodes
* IBM double byte host encodings such as ibm code
* pages 942,943,948, etc.
*
*/
public abstract class DBCS_IBM_EBCDIC_Encoder extends CharsetEncoder
{
protected static final char REPLACE_CHAR='\uFFFD';
private byte b1;
private byte b2;
protected short index1[];
protected String index2;
protected String index2a;
protected int mask1;
protected int mask2;
protected int shift;
private static final int SBCS = 0;
private static final int DBCS = 1;
private static final byte SO = 0x0e;
private static final byte SI = 0x0f;
private int currentState;
private final Surrogate.Parser sgp = new Surrogate.Parser();
protected DBCS_IBM_EBCDIC_Encoder(Charset cs) {
super(cs, 4.0f, 5.0f, new byte[] {(byte)0x6f});
}
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;
}
/**
* Returns true if the given character can be converted to the
* target character encoding.
*/
public boolean canEncode(char ch) {
int index;
int theBytes;
index = index1[((ch & mask1) >> shift)] + (ch & mask2);
if (index < 15000)
theBytes = (int)(index2.charAt(index));
else
theBytes = (int)(index2a.charAt(index-15000));
if (theBytes != 0)
return (true);
// only return true if input char was unicode null - all others are
// undefined
return( ch == '\u0000');
}
private 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();
int outputSize = 0; // size of output
int spaceNeeded;
try {
while (sp < sl) {
int index;
int theBytes;
char c = sa[sp];
if (Surrogate.is(c)) {
if (sgp.parse(c, sa, sp, sl) < 0)
return sgp.error();
return sgp.unmappableResult();
}
if (c >= '\uFFFE')
return CoderResult.unmappableForLength(1);
index = index1[((c & mask1) >> shift)]
+ (c & mask2);
if (index < 15000)
theBytes = (int)(index2.charAt(index));
else
theBytes = (int)(index2a.charAt(index-15000));
b1= (byte)((theBytes & 0x0000ff00)>>8);
b2 = (byte)(theBytes & 0x000000ff);
if (b1 == 0x00 && b2 == 0x00
&& c != '\u0000') {
return CoderResult.unmappableForLength(1);
}
if (currentState == DBCS && b1 == 0x00) {
if (dl - dp < 1)
return CoderResult.OVERFLOW;
currentState = SBCS;
da[dp++] = SI;
} else if (currentState == SBCS && b1 != 0x00) {
if (dl - dp < 1)
return CoderResult.OVERFLOW;
currentState = DBCS;
da[dp++] = SO;
}
if (currentState == DBCS)
spaceNeeded = 2;
else
spaceNeeded = 1;
if (dl - dp < spaceNeeded)
return CoderResult.OVERFLOW;
if (currentState == SBCS)
da[dp++] = b2;
else {
da[dp++] = b1;
da[dp++] = b2;
}
sp++;
}
return CoderResult.UNDERFLOW;
} finally {
src.position(sp - src.arrayOffset());
dst.position(dp - dst.arrayOffset());
}
}
private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {
int mark = src.position();
int outputSize = 0; // size of output
int spaceNeeded;
try {
while (src.hasRemaining()) {
int index;
int theBytes;
char c = src.get();
if (Surrogate.is(c)) {
if (sgp.parse(c, src) < 0)
return sgp.error();
return sgp.unmappableResult();
}
if (c >= '\uFFFE')
return CoderResult.unmappableForLength(1);
index = index1[((c & mask1) >> shift)]
+ (c & mask2);
if (index < 15000)
theBytes = (int)(index2.charAt(index));
else
theBytes = (int)(index2a.charAt(index-15000));
b1 = (byte)((theBytes & 0x0000ff00)>>8);
b2 = (byte)(theBytes & 0x000000ff);
if (b1== 0x00 && b2 == 0x00
&& c != '\u0000') {
return CoderResult.unmappableForLength(1);
}
if (currentState == DBCS && b1 == 0x00) {
if (dst.remaining() < 1)
return CoderResult.OVERFLOW;
currentState = SBCS;
dst.put(SI);
} else if (currentState == SBCS && b1 != 0x00) {
if (dst.remaining() < 1)
return CoderResult.OVERFLOW;
currentState = DBCS;
dst.put(SO);
}
if (currentState == DBCS)
spaceNeeded = 2;
else
spaceNeeded = 1;
if (dst.remaining() < spaceNeeded)
return CoderResult.OVERFLOW;
if (currentState == SBCS)
dst.put(b2);
else {
dst.put(b1);
dst.put(b2);
}
mark++;
}
return CoderResult.UNDERFLOW;
} finally {
src.position(mark);
}
}
protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
if (true && src.hasArray() && dst.hasArray())
return encodeArrayLoop(src, dst);
else
return encodeBufferLoop(src, dst);
}
}