/*
* Created on 21-Jun-2004
* Created by Paul Gardner
* Copyright (C) 2004, 2005, 2006 Aelitis, All Rights Reserved.
*
* This program 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.
* This program 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 for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package com.frostwire.torrent;
/**
* @author parg
*
*/
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
import java.util.Arrays;
final class LocaleUtilDecoderReal implements LocaleUtilDecoder {
private final CharsetDecoder decoder;
private final int index;
protected LocaleUtilDecoderReal(int index, CharsetDecoder decoder) {
this.index = index;
this.decoder = decoder;
}
public String getName() {
return decoder.charset().name();
}
public int getIndex() {
return index;
}
public String tryDecode(byte[] array, boolean lax) {
try {
ByteBuffer bb = ByteBuffer.wrap(array);
CharBuffer cb = CharBuffer.allocate(array.length);
CoderResult cr = decoder.decode(bb, cb, true);
if (!cr.isError()) {
cb.flip();
String str = cb.toString();
// lax means that as long as the conversion works we consider it usable
// as opposed to strict which requires reverse-conversion equivalence
if (lax) {
return str;
}
byte[] b2 = str.getBytes(getName());
// make sure the conversion is symetric (there are cases where it appears
// to work but in fact converting back to bytes leads to a different
// result
/*
for (int k=0;k<str.length();k++){
System.out.print( Integer.toHexString(str.charAt(k)));
}
System.out.println("");
*/
if (Arrays.equals(array, b2)) {
return str;
}
}
return null;
} catch (Throwable e) {
// Throwable here as we can get "classdefnotfound" + others if the decoder
// isn't available
return null;
}
}
public String decodeString(byte[] bytes) throws UnsupportedEncodingException {
if (bytes == null) {
return null;
}
try {
ByteBuffer bb = ByteBuffer.wrap(bytes);
CharBuffer cb = CharBuffer.allocate(bytes.length);
CoderResult cr = decoder.decode(bb, cb, true);
if (!cr.isError()) {
cb.flip();
String str = cb.toString();
byte[] b2 = str.getBytes(decoder.charset().name());
// make sure the conversion is symetric (there are cases where it appears
// to work but in fact converting back to bytes leads to a different
// result
/*
for (int k=0;k<str.length();k++){
System.out.print( Integer.toHexString(str.charAt(k)));
}
System.out.println("");
*/
if (Arrays.equals(bytes, b2)) {
return str;
}
}
} catch (Throwable e) {
// Throwable here as we can get "classdefnotfound" + others if the decoder
// isn't available
// ignore
}
try {
// no joy, default
return new String(bytes, Constants.DEFAULT_ENCODING);
} catch (UnsupportedEncodingException e) {
Debug.printStackTrace(e);
return new String(bytes);
}
}
}