//
// TargaRLECodec.java
//
/*
OME Bio-Formats package for reading and converting biological file formats.
Copyright (C) 2005-@year@ UW-Madison LOCI and Glencoe Software, Inc.
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
*/
package loci.formats.codec;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import loci.common.RandomAccessInputStream;
import loci.formats.FormatException;
import loci.formats.UnsupportedCompressionException;
/**
* This class implements Targa RLE decompression. Compression is not yet
* implemented.
*
* <dl><dt><b>Source code:</b></dt>
* <dd><a href="http://trac.openmicroscopy.org.uk/ome/browser/bioformats.git/components/bio-formats/src/loci/formats/codec/TargaRLECodec.java">Trac</a>,
* <a href="http://git.openmicroscopy.org/?p=bioformats.git;a=blob;f=components/bio-formats/src/loci/formats/codec/TargaRLECodec.java;hb=HEAD">Gitweb</a></dd></dl>
*
* @author Melissa Linkert melissa at glencoesoftware.com
*/
public class TargaRLECodec extends BaseCodec {
/* @see Codec#compress(byte[], CodecOptions) */
public byte[] compress(byte[] data, CodecOptions options)
throws FormatException
{
// TODO: Add compression support.
throw new UnsupportedCompressionException(
"Targa RLE compression not currently supported");
}
/**
* The CodecOptions parameter should have the following fields set:
* {@link CodecOptions#maxBytes maxBytes}
* {@link CodecOptions#bitsPerSample}
*
* @see Codec#decompress(RandomAccessInputStream, CodecOptions)
*/
public byte[] decompress(RandomAccessInputStream in, CodecOptions options)
throws FormatException, IOException
{
if (in == null)
throw new IllegalArgumentException("No data to decompress.");
if (options == null) options = CodecOptions.getDefaultOptions();
long fp = in.getFilePointer();
ByteArrayOutputStream output = new ByteArrayOutputStream(options.maxBytes);
int nread = 0;
BufferedInputStream s = new BufferedInputStream(in, 262144);
int bpp = options.bitsPerSample / 8;
while (output.size() < options.maxBytes) {
byte n = (byte) (s.read() & 0xff);
nread++;
if (n >= 0) { // 0 <= n <= 127
byte[] b = new byte[bpp * (n + 1)];
s.read(b);
nread += (bpp * n + 1);
output.write(b);
b = null;
}
else if (n != -128) { // -127 <= n <= -1
int len = (n & 0x7f) + 1;
byte[] inp = new byte[bpp];
s.read(inp);
nread += bpp;
for (int i=0; i<len; i++) output.write(inp);
}
}
in.seek(fp + nread);
return output.toByteArray();
}
}