{

static constexpr int ZXC_DEFAULT_LEVEL = 3;

explicit CompressionCodecZXC(int level_);

uint8_t getMethodByte() const override;

UInt32 getMaxCompressedDataSize(UInt32 uncompressed_size) const override;

/// zxc decodes literals with 32-byte SIMD "wild" loads that can read up to

/// ZXC_PAD_SIZE (32) bytes past the end of the compressed input. Reserve slack

/// at the end of the (de)compression buffers so these over-reads stay inside

/// allocated memory. This is the same mechanism `LZ4` uses. The over-read

/// bytes are only ever wild-copied and never influence results; MemorySanitizer

/// false positives from zxc's SIMD kernels are handled separately by building

/// zxc scalar under MSan (see contrib/zxc-cmake).

UInt32 getAdditionalSizeAtTheEndOfBuffer() const override { return 64; }

void updateHash(SipHash & hash) const override;

UInt32 doCompressData(const char * source, UInt32 source_size, char * dest) const override;

UInt32 doDecompressData(const char * source, UInt32 source_size, char * dest, UInt32 uncompressed_size) const override;

bool isCompression() const override { return true; }

bool isGenericCompression() const override { return true; }

bool isExperimental() const override { return true; }

String getDescription() const override

{

return "Asymmetric LZ codec (zxc): slow compression, very fast decompression, ratio between LZ4 and ZSTD. Levels 1..7.";

}

const int level;