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/*
* Copyright (c) 2002, 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 sun.nio.cs.HistoricallyNamedCharset;
public class SJIS
extends Charset
implements HistoricallyNamedCharset
{
public SJIS() {
super("Shift_JIS", ExtendedCharsets.aliasesFor("Shift_JIS"));
}
public String historicalName() {
return "SJIS";
}
public boolean contains(Charset cs) {
return ((cs.name().equals("US-ASCII"))
|| (cs instanceof JIS_X_0201)
|| (cs instanceof SJIS)
|| (cs instanceof JIS_X_0208));
}
public CharsetDecoder newDecoder() {
return new Decoder(this);
}
public CharsetEncoder newEncoder() {
// Need to force the replacement byte to 0x3f
// because JIS_X_0208_Encoder defines its own
// alternative 2 byte substitution to permit it
// to exist as a self-standing Encoder
byte[] replacementBytes = { (byte)0x3f };
return new Encoder(this).replaceWith(replacementBytes);
}
static class Decoder extends JIS_X_0208_Decoder
implements DelegatableDecoder {
JIS_X_0201.Decoder jis0201;
protected Decoder(Charset cs) {
super(cs);
jis0201 = new JIS_X_0201.Decoder(cs);
}
protected char decodeSingle(int b) {
// If the high bits are all off, it's ASCII == Unicode
if ((b & 0xFF80) == 0) {
return (char)b;
}
return jis0201.decode(b);
}
protected char decodeDouble(int c1, int c2) {
int adjust = c2 < 0x9F ? 1 : 0;
int rowOffset = c1 < 0xA0 ? 0x70 : 0xB0;
int cellOffset = (adjust == 1) ? (c2 > 0x7F ? 0x20 : 0x1F) : 0x7E;
int b1 = ((c1 - rowOffset) << 1) - adjust;
int b2 = c2 - cellOffset;
return super.decodeDouble(b1, b2);
}
// Make some protected methods public for use by JISAutoDetect
public CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {
return super.decodeLoop(src, dst);
}
public void implReset() {
super.implReset();
}
public CoderResult implFlush(CharBuffer out) {
return super.implFlush(out);
}
}
static class Encoder extends JIS_X_0208_Encoder {
private JIS_X_0201.Encoder jis0201;
private static final short[] j0208Index1 =
JIS_X_0208_Encoder.getIndex1();
private static final String[] j0208Index2 =
JIS_X_0208_Encoder.getIndex2();
protected Encoder(Charset cs) {
super(cs);
jis0201 = new JIS_X_0201.Encoder(cs);
}
protected int encodeSingle(char inputChar) {
byte b;
// \u0000 - \u007F map straight through
if ((inputChar & 0xFF80) == 0)
return (byte)inputChar;
if ((b = jis0201.encode(inputChar)) == 0)
return -1;
else
return b;
}
protected int encodeDouble(char ch) {
int offset = j0208Index1[ch >> 8] << 8;
int pos = j0208Index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff));
if (pos == 0) {
/* Zero value indicates this Unicode has no mapping to
* JIS0208.
* We bail here because the JIS -> SJIS algorithm produces
* bogus SJIS values for invalid JIS input. Zero should be
* the only invalid JIS value in our table.
*/
return 0;
}
/*
* This algorithm for converting from JIS to SJIS comes from
* Ken Lunde's "Understanding Japanese Information Processing",
* pg 163.
*/
int c1 = (pos >> 8) & 0xff;
int c2 = pos & 0xff;
int rowOffset = c1 < 0x5F ? 0x70 : 0xB0;
int cellOffset = (c1 % 2 == 1) ? (c2 > 0x5F ? 0x20 : 0x1F) : 0x7E;
return ((((c1 + 1 ) >> 1) + rowOffset) << 8) | (c2 + cellOffset);
}
}
}
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