Package org.apache.hadoop.io.compress.zstd

Class ZStandardDecompressor.ZStandardDirectDecompressor

java.lang.Object

org.apache.hadoop.io.compress.zstd.ZStandardDecompressor

org.apache.hadoop.io.compress.zstd.ZStandardDecompressor.ZStandardDirectDecompressor

All Implemented Interfaces:

Decompressor, DirectDecompressor

Enclosing class:

ZStandardDecompressor

public static class ZStandardDecompressor.ZStandardDirectDecompressor
extends ZStandardDecompressor
implements DirectDecompressor

A DirectDecompressor for ZStandard https://github.com/facebook/zstd.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.io.compress.zstd.ZStandardDecompressor

ZStandardDecompressor.ZStandardDirectDecompressor

Constructor Summary

Constructors

Constructor	Description
ZStandardDirectDecompressor(int directBufferSize)

Method Summary

Modifier and Type	Method	Description
int	decompress(byte[] b, int off, int len)	Fills specified buffer with uncompressed data.
void	decompress(java.nio.ByteBuffer src, java.nio.ByteBuffer dst)
boolean	finished()	Returns true if the end of the decompressed data output stream has been reached.
void	reset()	Resets everything including the input buffers (user and direct).
void	setDictionary(byte[] b, int off, int len)	Sets preset dictionary for compression.

Methods inherited from class org.apache.hadoop.io.compress.zstd.ZStandardDecompressor

end, finalize, getRecommendedBufferSize, getRemaining, isNativeCodeLoaded, needsDictionary, needsInput, setInput

Methods inherited from class java.lang.Object

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

Constructor Detail

ZStandardDirectDecompressor

public ZStandardDirectDecompressor(int directBufferSize)

Method Detail

finished

public boolean finished()

Description copied from interface: Decompressor

Returns true if the end of the decompressed data output stream has been reached. Indicates a concatenated data stream when finished() returns true and Decompressor.getRemaining() returns a positive value. finished() will be reset with the Decompressor.reset() method.

Specified by:

finished in interface Decompressor

Overrides:

finished in class ZStandardDecompressor

Returns:

true if the end of the decompressed data output stream has been reached.

reset

public void reset()

Description copied from class: ZStandardDecompressor

Resets everything including the input buffers (user and direct).

Specified by:

reset in interface Decompressor

Overrides:

reset in class ZStandardDecompressor

decompress

public void decompress(java.nio.ByteBuffer src,
                       java.nio.ByteBuffer dst)
                throws java.io.IOException

Specified by:

decompress in interface DirectDecompressor

Throws:

java.io.IOException

setDictionary

public void setDictionary(byte[] b,
                          int off,
                          int len)

Description copied from interface: Decompressor

Sets preset dictionary for compression. A preset dictionary is used when the history buffer can be predetermined.

Specified by:

setDictionary in interface Decompressor

Overrides:

setDictionary in class ZStandardDecompressor

Parameters:

b - Dictionary data bytes

off - Start offset

len - Length

decompress

public int decompress(byte[] b,
                      int off,
                      int len)

Description copied from interface: Decompressor

Fills specified buffer with uncompressed data. Returns actual number of bytes of uncompressed data. A return value of 0 indicates that Decompressor.needsInput() should be called in order to determine if more input data is required.

Specified by:

decompress in interface Decompressor

Overrides:

decompress in class ZStandardDecompressor

Parameters:

b - Buffer for the uncompressed data

off - Start offset of the data

len - Size of the buffer

Returns:

The actual number of bytes of uncompressed data.