Package com.yahoo.compress

Class ZstdCompressor

java.lang.Object

com.yahoo.compress.ZstdCompressor

public class ZstdCompressor
extends Object

Frame based Zstd compressor (https://github.com/facebook/zstd) Implemented based on https://github.com/airlift/aircompressor - a pure Java implementation (no JNI).

Author:

bjorncs

Constructor Summary

Constructors

Constructor	Description
ZstdCompressor()

Method Summary

Modifier and Type	Method	Description
byte[]	compress(byte[] input, int inputOffset, int inputLength)
int	compress(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset, int maxOutputLength)
byte[]	decompress(byte[] input, int inputOffset, int inputLength)	Note: Implementation assumes single frame (since getDecompressedLength(byte[], int, int) only includes the first frame) The decompress(byte[], int, int, byte[], int, int) overload will try to decompress all frame, causing the output buffer to overflow.
int	decompress(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset, int maxOutputLength)
static int	getDecompressedLength(byte[] input, int inputOffset, int inputLength)
static int	getMaxCompressedLength(int uncompressedLength)

Methods inherited from class java.lang.Object

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

Constructor Detail

ZstdCompressor

public ZstdCompressor()

Method Detail

compress

public byte[] compress(byte[] input,
                       int inputOffset,
                       int inputLength)

compress

public int compress(byte[] input,
                    int inputOffset,
                    int inputLength,
                    byte[] output,
                    int outputOffset,
                    int maxOutputLength)

decompress

public byte[] decompress(byte[] input,
                         int inputOffset,
                         int inputLength)

Note: Implementation assumes single frame (since getDecompressedLength(byte[], int, int) only includes the first frame) The decompress(byte[], int, int, byte[], int, int) overload will try to decompress all frame, causing the output buffer to overflow.

decompress

public int decompress(byte[] input,
                      int inputOffset,
                      int inputLength,
                      byte[] output,
                      int outputOffset,
                      int maxOutputLength)

getMaxCompressedLength

public static int getMaxCompressedLength(int uncompressedLength)

getDecompressedLength

public static int getDecompressedLength(byte[] input,
                                        int inputOffset,
                                        int inputLength)