/*
* 21.04.2004 Original verion. davagin@udm.ru.
*-----------------------------------------------------------------------
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*----------------------------------------------------------------------
*/
package davaguine.jmac.info;
import davaguine.jmac.tools.ByteArrayReader;
import davaguine.jmac.tools.ByteArrayWriter;
import davaguine.jmac.tools.File;
import davaguine.jmac.tools.JMACException;
import java.io.EOFException;
import java.io.IOException;
/**
* Author: Dmitry Vaguine
* Date: 07.04.2004
* Time: 14:36:53
*/
public class APEDescriptor {
public String cID; // should equal 'MAC ' (char[4])
public int nVersion; // version number * 1000 (3.81 = 3810) (unsigned short)
public long nDescriptorBytes; // the number of descriptor bytes (allows later expansion of this header) (unsigned int32)
public long nHeaderBytes; // the number of header APE_HEADER bytes (unsigned int32)
public long nSeekTableBytes; // the number of bytes of the seek table (unsigned int32)
public long nHeaderDataBytes; // the number of header data bytes (from original file) (unsigned int32)
public long nAPEFrameDataBytes; // the number of bytes of APE frame data (unsigned int32)
public long nAPEFrameDataBytesHigh; // the high order number of APE frame data bytes (unsigned int32)
public long nTerminatingDataBytes; // the terminating data of the file (not including tag data) (unsigned int32)
public byte[] cFileMD5 = new byte[16]; // the MD5 hash of the file (see notes for usage... it's a littly tricky) (unsigned char[16])
public final static int APE_DESCRIPTOR_BYTES = 52;
public static APEDescriptor read(final File file) throws IOException {
try {
APEDescriptor header = new APEDescriptor();
final ByteArrayReader reader = new ByteArrayReader(file, APE_DESCRIPTOR_BYTES - 16);
header.cID = reader.readString(4, "US-ASCII");
header.nVersion = reader.readUnsignedShort();
reader.skipBytes(2);
header.nDescriptorBytes = reader.readUnsignedInt();
header.nHeaderBytes = reader.readUnsignedInt();
header.nSeekTableBytes = reader.readUnsignedInt();
header.nHeaderDataBytes = reader.readUnsignedInt();
header.nAPEFrameDataBytes = reader.readUnsignedInt();
header.nAPEFrameDataBytesHigh = reader.readUnsignedInt();
header.nTerminatingDataBytes = reader.readUnsignedInt();
file.readFully(header.cFileMD5);
return header;
} catch (EOFException e) {
throw new JMACException("Unsupported Format");
}
}
public void write(ByteArrayWriter writer) {
writer.writeString(cID, 4, "US-ASCII");
writer.writeUnsignedShort(nVersion);
writer.writeUnsignedShort(0);
writer.writeUnsignedInt(nDescriptorBytes);
writer.writeUnsignedInt(nHeaderBytes);
writer.writeUnsignedInt(nSeekTableBytes);
writer.writeUnsignedInt(nHeaderDataBytes);
writer.writeUnsignedInt(nAPEFrameDataBytes);
writer.writeUnsignedInt(nAPEFrameDataBytesHigh);
writer.writeUnsignedInt(nTerminatingDataBytes);
writer.writeBytes(cFileMD5);
}
}