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/*****************************************************************
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
| $Id: DataAtom.java 196 2008-10-14 22:59:31Z bok $
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL 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, or (at your option)
| any later version.
|
| Bento4|GPL 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 Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
package com.axiosys.bento4.metadata;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import com.axiosys.bento4.Atom;
public class DataAtom extends Atom {
public final static int DATA_TYPE_BINARY = 0;
public final static int DATA_TYPE_STRING_UTF8 = 1;
public final static int DATA_TYPE_STRING_UTF16 = 2;
public final static int DATA_TYPE_STRING_MAC_ENCODED = 3;
public final static int DATA_TYPE_JPEG = 14;
public final static int DATA_TYPE_SIGNED_INT_BE = 21; /* the size of the integer is derived from the container size */
public final static int DATA_TYPE_FLOAT32_BE = 22;
public final static int DATA_TYPE_FLOAT64_BE = 23;
private int dataType;
private int dataLang;
private RandomAccessFile source;
private long sourceOffset;
private int payloadSize;
public DataAtom(int size, RandomAccessFile source) throws IOException {
super(MetaData.TYPE_DATA, size, false);
if (size < Atom.HEADER_SIZE+8) return;
dataType = source.readInt();
dataLang = source.readInt();
// the stream for the data is a substream of this source
this.source = source;
sourceOffset = source.getFilePointer();
payloadSize = size-Atom.HEADER_SIZE-8;
}
// accessors
int getDataType() { return dataType; }
int getDataLang() { return dataLang; }
// methods
String loadString() throws IOException {
return new String(loadBytes(), "UTF-8");
}
byte[] loadBytes() throws IOException {
source.seek(sourceOffset);
byte[] str = new byte[payloadSize];
source.read(str);
return str;
}
long loadInteger() throws IOException {
source.seek(sourceOffset);
switch (payloadSize) {
case 1:
return source.readByte();
case 2:
return source.readShort();
case 4:
return source.readInt();
case 8:
return source.readLong();
default:
throw new IOException("invalid integer size");
}
}
protected void writeFields(DataOutputStream stream) throws IOException {
// not implemented yet
throw new RuntimeException("not implemented yet");
}
public String toString(String indentation) {
StringBuffer result = new StringBuffer(super.toString(indentation));
result.append("\n" + indentation + " data_type = " + dataType);
result.append("\n" + indentation + " data_lang = " + dataLang);
String dataString;
try {
switch (dataType) {
case DATA_TYPE_STRING_UTF8: dataString = loadString(); break;
case DATA_TYPE_SIGNED_INT_BE: dataString = Integer.toString((int) loadInteger()); break;
default: dataString = Integer.toString(payloadSize) + " bytes"; break;
}
} catch (Exception e) {
dataString = "";
}
result.append("\n" + indentation + " data = " + dataString);
return result.toString();
}
}
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