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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "lz4compressor.h"
#include <vespa/vespalib/util/alloc.h>
#include <lz4.h>
#include <lz4hc.h>
#include <cassert>
using vespalib::alloc::Alloc;
namespace vespalib::compression {
size_t LZ4Compressor::adjustProcessLen(uint16_t, size_t len) const { return LZ4_compressBound(len); }
bool
LZ4Compressor::process(CompressionConfig config, const void * inputV, size_t inputLen, void * outputV, size_t & outputLenV)
{
const char * input(static_cast<const char *>(inputV));
char * output(static_cast<char *>(outputV));
int sz(-1);
int maxOutputLen = LZ4_compressBound(inputLen);
if (config.compressionLevel > 6) {
Alloc state = Alloc::alloc(LZ4_sizeofStateHC());
sz = LZ4_compress_HC_extStateHC(state.get(), input, output, inputLen, maxOutputLen, config.compressionLevel);
} else {
Alloc state = Alloc::alloc(LZ4_sizeofState());
sz = LZ4_compress_fast_extState(state.get(), input, output, inputLen, maxOutputLen, 1);
}
assert(sz != 0);
outputLenV = sz;
return (sz != 0);
}
bool
LZ4Compressor::unprocess(const void * inputV, size_t inputLen, void * outputV, size_t & outputLenV)
{
const char * input(static_cast<const char *>(inputV));
char * output(static_cast<char *>(outputV));
int sz = LZ4_decompress_safe(input, output, inputLen, outputLenV);
assert(sz > 0);
outputLenV = sz;
return (sz > 0);
}
}
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