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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "zstdcompressor.h"
#include <vespa/vespalib/util/alloc.h>
#include <zstd.h>
#include <cassert>
using vespalib::alloc::Alloc;
namespace vespalib::compression {
namespace {
class CompressContext {
public:
CompressContext() : _ctx(ZSTD_createCCtx()) {}
~CompressContext() { ZSTD_freeCCtx(_ctx); }
ZSTD_CCtx * get() { return _ctx; }
private:
ZSTD_CCtx * _ctx;
};
class DecompressContext {
public:
DecompressContext() : _ctx(ZSTD_createDCtx()) {}
~DecompressContext() { ZSTD_freeDCtx(_ctx); }
ZSTD_DCtx * get() { return _ctx; }
private:
ZSTD_DCtx * _ctx;
};
thread_local std::unique_ptr<CompressContext> _tlCompressState;
thread_local std::unique_ptr<DecompressContext> _tlDecompressState;
}
size_t ZStdCompressor::adjustProcessLen(uint16_t, size_t len) const { return ZSTD_compressBound(len); }
bool
ZStdCompressor::process(CompressionConfig config, const void * inputV, size_t inputLen, void * outputV, size_t & outputLenV)
{
size_t maxOutputLen = ZSTD_compressBound(inputLen);
if ( ! _tlCompressState) {
_tlCompressState = std::make_unique<CompressContext>();
}
size_t sz = ZSTD_compressCCtx(_tlCompressState->get(), outputV, maxOutputLen, inputV, inputLen, config.compressionLevel);
assert( ! ZSTD_isError(sz) );
outputLenV = sz;
return ! ZSTD_isError(sz);
}
bool
ZStdCompressor::unprocess(const void * inputV, size_t inputLen, void * outputV, size_t & outputLenV)
{
if ( ! _tlDecompressState) {
_tlDecompressState = std::make_unique<DecompressContext>();
}
size_t sz = ZSTD_decompressDCtx(_tlDecompressState->get(), outputV, outputLenV, inputV, inputLen);
assert( ! ZSTD_isError(sz) );
outputLenV = sz;
return ! ZSTD_isError(sz);
}
}
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