org.itadaki.bzip2

Class BZip2BlockDecompressor

java.lang.Object

org.itadaki.bzip2.BZip2BlockDecompressor

public class BZip2BlockDecompressor
extends Object

Reads and decompresses a single BZip2 block

Constructor Summary

Constructors

Constructor and Description
BZip2BlockDecompressor(BZip2BitInputStream bitInputStream, int blockSize)

Method Summary

Methods

Modifier and Type	Method and Description
int	checkCRC() Verify and return the block CRC.
int	read() Decodes a byte from the final Run-Length Encoding stage, pulling a new byte from the Burrows-Wheeler Transform stage when required
int	read(byte[] destination, int offset, int length) Decodes multiple bytes from the final Run-Length Encoding stage, pulling new bytes from the Burrows-Wheeler Transform stage when required

Methods inherited from class java.lang.Object

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

Constructor Detail

BZip2BlockDecompressor

public BZip2BlockDecompressor(BZip2BitInputStream bitInputStream,
                      int blockSize)
                       throws IOException

Parameters:

bitInputStream - The BZip2BitInputStream to read from

blockSize - The maximum decoded size of the block

Throws:

IOException - If the block could not be decoded

Method Detail

read

public int read()

Decodes a byte from the final Run-Length Encoding stage, pulling a new byte from the Burrows-Wheeler Transform stage when required

Returns:

The decoded byte, or -1 if there are no more bytes

read

public int read(byte[] destination,
       int offset,
       int length)

Decodes multiple bytes from the final Run-Length Encoding stage, pulling new bytes from the Burrows-Wheeler Transform stage when required

Parameters:

destination - The array to write to

offset - The starting position within the array

length - The number of bytes to read

Returns:

The number of bytes actually read, or -1 if there are no bytes left in the block

checkCRC

public int checkCRC()
             throws IOException

Verify and return the block CRC. This method may only be called after all of the block's bytes have been read

Returns:

The block CRC

Throws:

IOException - if the CRC verification failed