de.carne.nio.compression.common

Class HistoryBuffer

java.lang.Object

de.carne.nio.compression.common.HistoryBuffer

public final class HistoryBuffer
extends java.lang.Object

History buffer as used for Deflate processing.

Constructor Summary

Constructors

Constructor and Description
HistoryBuffer(int size) Construct HistoryBuffer.

Method Summary

Modifier and Type	Method and Description
void	clear() Clear the history buffer.
void	copyBlock(int dist, int len) Copy (repeat) a number of bytes from the history buffer.
int	flush(java.nio.ByteBuffer dst) Flush the history data to a byte buffer.
int	getSize() Get the history buffer size.
void	putByte(byte b) Put a single byte into the history buffer.
void	putBytes(BitDecoder bitDecoder, java.nio.channels.ReadableByteChannel src, int length) Read a number of bytes from a channel and put them into the history buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

HistoryBuffer

public HistoryBuffer(int size)

Construct HistoryBuffer.

Parameters:

size - The history buffer size.

Method Detail

getSize

public int getSize()

Get the history buffer size.

Returns:

The history buffer size.

clear

public void clear()

Clear the history buffer.

putByte

public void putByte(byte b)

Put a single byte into the history buffer.

Parameters:

b - The byte to put into the history buffer.

putBytes

public void putBytes(BitDecoder bitDecoder,
                     java.nio.channels.ReadableByteChannel src,
                     int length)
              throws java.io.IOException

Read a number of bytes from a channel and put them into the history buffer.

Parameters:

bitDecoder - The BitDecoder to use for reading the bytes.

src - The ReadableByteChannel to read the bytes from.

length - The number of bytes to read and to put into the history buffer.

Throws:

java.io.IOException - if an I/O error occurs.

copyBlock

public void copyBlock(int dist,
                      int len)
               throws java.io.IOException

Copy (repeat) a number of bytes from the history buffer.

Parameters:

dist - The distance of the history bytes to copy.

len - The number of bytes to copy.

Throws:

java.io.IOException - if an I/O error occurs.

flush

public int flush(java.nio.ByteBuffer dst)

Flush the history data to a byte buffer.

Parameters:

dst - The ByteBuffer receiving the history data.

Returns:

The number of flushed bytes.