/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.fs.jfat;
import java.nio.CharBuffer;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import java.nio.charset.CharacterCodingException;
/**
* @author gvt
*/
public class CodePageEncoder {
private final CharsetEncoder encoder;
private boolean lossy;
protected CodePageEncoder(Charset cs) {
this.encoder = cs.newEncoder();
reset();
}
public void reset() {
encoder.reset();
lossy = false;
}
public boolean isLossy() {
return lossy;
}
private ByteBuffer encode(CharBuffer in, boolean map, byte replacement)
throws CharacterCodingException {
int n = (int) (in.remaining() * encoder.averageBytesPerChar());
ByteBuffer out = ByteBuffer.allocate(n);
if (n == 0) {
return out;
}
reset();
for (;;) {
CoderResult cr;
if (in.hasRemaining()) {
cr = encoder.encode(in, out, true);
} else {
cr = encoder.flush(out);
}
if (cr.isUnderflow()) {
break;
}
if (cr.isOverflow()) {
n *= 2;
ByteBuffer o = ByteBuffer.allocate(n);
out.flip();
o.put(out);
out = o;
continue;
}
if (map & cr.isUnmappable()) {
lossy = true;
in.get();
out.put(replacement);
continue;
}
cr.throwException();
}
out.flip();
return out;
}
public byte[] encode(String s, byte replacement) throws CharacterCodingException {
ByteBuffer out = encode(CharBuffer.wrap(s), true, replacement);
byte[] b = new byte[out.remaining()];
out.get(b);
return b;
}
public byte[] encode(String s) throws CharacterCodingException {
ByteBuffer out = encode(CharBuffer.wrap(s), false, (byte) '?');
byte[] b = new byte[out.remaining()];
out.get(b);
return b;
}
}