Package org.web3d.vrml.export.compressors

Class BitPacker

java.lang.Object

org.web3d.vrml.export.compressors.BitPacker

public class BitPacker
extends Object

Pack a stream of integers of variables bits into a packed form. Loosely copied from Johnathon Blow's "Packing Integers" article.

Version:

$Revision: 1.4 $

Author:

Alan Hudson

Constructor Summary

Constructors

Constructor	Description
BitPacker(int maxLength)	Construct a bit packer.

Method Summary

Modifier and Type	Method	Description
void	getResult(byte[] result)	Get the result of the packing.
void	pack(int value, int num_bits)	Pack this value using num_bits.
int	size()	Get the size of the result.
void	writeStream(DataOutputStream dos)	Write this stream out to a stream.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

BitPacker

public BitPacker(int maxLength)

Construct a bit packer.

Parameters:

maxLength - The maximum length in bytes of the stream to pack.

Method Details

size

public int size()

Get the size of the result. This will be the number of bytes used, not the maximum length.

Returns:

getResult

public void getResult(byte[] result)

Get the result of the packing. Use size to preallocate the result array.

Parameters:

result -

pack

public void pack(int value,
 int num_bits)

Pack this value using num_bits.

Parameters:

value -

num_bits -

writeStream

public void writeStream(DataOutputStream dos)
                 throws IOException

Write this stream out to a stream. Only writes the bytes used, not the maximum size.

Parameters:

dos -

Throws:

IOException