/*
* Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Nam Nguyen
*/
package com.caucho.quercus.lib.i18n;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.StringValue;
import com.caucho.vfs.TempCharBuffer;
public class GenericDecoder
extends Decoder
{
private Charset _charset;
protected CharsetDecoder _decoder;
public GenericDecoder(String charsetName)
{
super(charsetName);
_charset = Charset.forName(charsetName);
_decoder = _charset.newDecoder();
}
@Override
public void reset()
{
_decoder.reset();
super.reset();
}
@Override
public boolean isDecodable(Env env, StringValue str)
{
if (str.isUnicode())
return true;
ByteBuffer in = ByteBuffer.wrap(str.toBytes());
CharBuffer out = CharBuffer.allocate(512);
while (in.hasRemaining()) {
CoderResult coder = _decoder.decode(in, out, false);
if (coder.isMalformed())
return false;
out.clear();
}
CoderResult coder = _decoder.decode(in, out, true);
if (coder.isMalformed())
return false;
out.clear();
coder = _decoder.flush(out);
if (coder.isMalformed())
return false;
return true;
}
@Override
protected StringBuilder decodeImpl(Env env, StringValue str)
{
ByteBuffer in = ByteBuffer.wrap(str.toBytes());
TempCharBuffer tempBuf = TempCharBuffer.allocate();
try {
CharBuffer out = CharBuffer.wrap(tempBuf.getBuffer());
StringBuilder sb = new StringBuilder();
while (in.hasRemaining()) {
CoderResult coder = _decoder.decode(in, out, false);
if (! fill(sb, in, out, coder))
return sb;
out.clear();
}
CoderResult coder = _decoder.decode(in, out, true);
if (! fill(sb, in, out, coder))
return sb;
out.clear();
coder = _decoder.flush(out);
fill(sb, in, out, coder);
return sb;
} finally {
TempCharBuffer.free(tempBuf);
}
}
protected boolean fill(StringBuilder sb, ByteBuffer in,
CharBuffer out, CoderResult coder)
{
int len = out.position();
if (len > 0) {
int offset = out.arrayOffset();
sb.append(out.array(), offset, len);
}
if (coder.isMalformed() || coder.isUnmappable()) {
_hasError = true;
int errorPosition = in.position();
in.position(errorPosition + 1);
if (_isIgnoreErrors) {
}
else if (_replacement != null)
sb.append(_replacement);
else if (_isAllowMalformedOut)
sb.append((char) in.get(errorPosition));
else
return false;
}
return true;
}
}