package net.sf.cram.encoding;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.util.Map;
import net.sf.cram.EncodingID;
import net.sf.cram.EncodingParams;
import net.sf.cram.io.ByteBufferUtils;
import net.sf.cram.io.ExposedByteArrayOutputStream;
public class GolombIntegerEncoding implements Encoding<Integer> {
public static final EncodingID ENCODING_ID = EncodingID.GOLOMB;
private int m;
private int offset;
public GolombIntegerEncoding() {
}
public GolombIntegerEncoding(int m) {
this.m = m;
this.offset = 0 ;
}
@Override
public EncodingID id() {
return ENCODING_ID;
}
public static EncodingParams toParam(int m) {
GolombIntegerEncoding e = new GolombIntegerEncoding();
e.m = m;
e.offset = 0 ;
return new EncodingParams(ENCODING_ID, e.toByteArray());
}
public static EncodingParams toParam(int m, int offset) {
GolombIntegerEncoding e = new GolombIntegerEncoding();
e.m = m;
e.offset = offset ;
return new EncodingParams(ENCODING_ID, e.toByteArray());
}
@Override
public byte[] toByteArray() {
ByteBuffer buf = ByteBuffer.allocate(10);
ByteBufferUtils.writeUnsignedITF8(offset, buf);
ByteBufferUtils.writeUnsignedITF8(m, buf);
buf.flip();
byte[] array = new byte[buf.limit()];
buf.get(array);
return array;
}
@Override
public void fromByteArray(byte[] data) {
ByteBuffer buf = ByteBuffer.wrap(data) ;
offset = ByteBufferUtils.readUnsignedITF8(buf);
m = ByteBufferUtils.readUnsignedITF8(buf);
}
@Override
public BitCodec<Integer> buildCodec(Map<Integer, InputStream> inputMap,
Map<Integer, ExposedByteArrayOutputStream> outputMap) {
return new GolombIntegerCodec(m, true, offset);
}
}