SMF to JET converter for Android JetPlayer

gistfile1.java

/*

Copyright (C) 2010 Atsushi Eno  http://github.com/atsushieno

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

// The converter main() just runs. Not sure if the resulting jet file is valid.

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

public class SmfToJetConverter
{
	public static void main (String [] args) throws IOException
	{
		SmfToJetConverter c = new SmfToJetConverter ();
		for (int i = 0; i < args.length; i++) {
			String arg = args [i];
			c.Convert (arg, arg.substring(0, arg.length() - 4) + ".jet");
		}
	}

	public void Convert (String smf, String jet) throws IOException
	{
		File smfFile = new File (smf);
		int headerSize = 0x30 + 8 - 8; // JET..JCOP0000JSMFxxxx
		int smfLen = (int) smfFile.length();
		FileInputStream smfStream = new FileInputStream (smfFile);
		DataOutputStream jetStream = new DataOutputStream (new FileOutputStream (jet));
		jetStream.writeBytes("JET ");
		writeBigEndianInt(jetStream, smfLen + headerSize);
		jetStream.writeBytes("JINF");
		jetStream.writeInt(0x18000000);
		jetStream.writeBytes("JVER");
		jetStream.writeInt(1);
		jetStream.writeBytes("SMF#");
		jetStream.writeInt(0x01000000);
		jetStream.writeBytes("DLS#");
		jetStream.writeInt(0);
		jetStream.writeBytes("JCOP");
		jetStream.writeInt(0);
		jetStream.writeBytes("JSMF");
		writeBigEndianInt(jetStream, smfLen);
		byte [] smfBuf = new byte [smfLen];
		smfStream.read(smfBuf);
		smfStream.close();
		jetStream.write(smfBuf);
		jetStream.close();
	}

	void writeBigEndianInt(DataOutputStream s, int value)
		throws IOException
	{
		ByteBuffer buffer = ByteBuffer.allocate(4);
		buffer.order(ByteOrder.LITTLE_ENDIAN);
		buffer.putInt(0, value);
		for (int i = 0; i < 4; i++)
			s.writeByte(buffer.get());
	}
}