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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.compress;
import java.util.Arrays;
/**
* 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
*/
public class ZstdCompressor {
private static final io.airlift.compress.zstd.ZstdCompressor compressor = new io.airlift.compress.zstd.ZstdCompressor();
private static final io.airlift.compress.zstd.ZstdDecompressor decompressor = new io.airlift.compress.zstd.ZstdDecompressor();
public byte[] compress(byte[] input, int inputOffset, int inputLength) {
int maxCompressedLength = compressor.maxCompressedLength(inputLength);
byte[] output = new byte[maxCompressedLength];
int compressedLength = compressor.compress(input, inputOffset, inputLength, output, 0, maxCompressedLength);
return Arrays.copyOf(output, compressedLength);
}
public byte[] decompress(byte[] input, int inputOffset, int inputLength) {
int decompressedLength = (int) io.airlift.compress.zstd.ZstdDecompressor.getDecompressedSize(input, inputOffset, inputLength);
byte[] output = new byte[decompressedLength];
decompressor.decompress(input, inputOffset, inputLength, output, 0, decompressedLength);
return output;
}
}
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