/*
* Entagged Audio Tag library
* Copyright (c) 2003-2005 Rapha�l Slinckx <raphael@slinckx.net>
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package entagged.audioformats.ape.util;
import java.io.IOException;
import java.io.RandomAccessFile;
import entagged.audioformats.Tag;
import entagged.audioformats.ape.ApeTag;
import entagged.audioformats.exceptions.CannotReadException;
import entagged.audioformats.generic.Utils;
public class ApeTagReader {
public Tag read(RandomAccessFile raf) throws CannotReadException, IOException {
ApeTag tag = new ApeTag();
//Check wether the file contains an APE tag--------------------------------
raf.seek( raf.length() - 32 );
byte[] b = new byte[8];
raf.read(b);
String tagS = new String( b );
if(!tagS.equals( "APETAGEX" )){
throw new CannotReadException("There is no APE Tag in this file");
}
//Parse the tag -)------------------------------------------------
//Version
b = new byte[4];
raf.read( b );
int version = Utils.getNumber(b, 0,3);
if(version != 2000) {
throw new CannotReadException("APE Tag other than version 2.0 are not supported");
}
//Size
b = new byte[4];
raf.read( b );
long tagSize = Utils.getLongNumber(b, 0,3);
//Number of items
b = new byte[4];
raf.read( b );
int itemNumber = Utils.getNumber(b, 0,3);
//Tag Flags
b = new byte[4];
raf.read( b );
//TODO handle these
raf.seek(raf.length() - tagSize);
for(int i = 0; i<itemNumber; i++) {
//Content length
b = new byte[4];
raf.read( b );
int contentLength = Utils.getNumber(b, 0,3);
if(contentLength > 500000)
throw new CannotReadException("Item size is much too large: "+contentLength+" bytes");
//Item flags
b = new byte[4];
raf.read( b );
//TODO handle these
boolean binary = ((b[0]&0x06) >> 1) == 1;
int j = 0;
while(raf.readByte() != 0)
j++;
raf.seek(raf.getFilePointer() - j -1);
int fieldSize = j;
//Read Item key
b = new byte[fieldSize];
raf.read( b );
raf.skipBytes(1);
String field = new String(b);
//Read Item content
b = new byte[contentLength];
raf.read( b );
if(!binary)
tag.add(new ApeTagTextField(field, new String(b, "UTF-8")));
else
tag.add(new ApeTagBinaryField(field, b));
}
return tag;
}
}