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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 "zstdcompressor.h"
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/vespalib/data/databuffer.h>
#include <stdexcept>
using vespalib::alloc::Alloc;
namespace vespalib::compression {
//-----------------------------------------------------------------------------
namespace {
template <typename F>
void with_compressor(CompressionConfig::Type type, F &&f) {
switch (type) {
case CompressionConfig::LZ4:
{
LZ4Compressor lz4;
f(lz4);
}
break;
case CompressionConfig::ZSTD:
{
ZStdCompressor zstd;
f(zstd);
}
break;
default:
throw std::runtime_error(make_string("No implementation for compression type '%d'", type));
break;
}
}
}
//-----------------------------------------------------------------------------
CompressionConfig::Type
compress(ICompressor & compressor, CompressionConfig compression, const ConstBufferRef & org, DataBuffer & dest)
{
CompressionConfig::Type type(CompressionConfig::NONE);
dest.ensureFree(compressor.adjustProcessLen(0, org.size()));
size_t compressedSize(dest.getFreeLen());
if (compressor.process(compression, org.c_str(), org.size(), dest.getFree(), compressedSize)) {
if (compressedSize < ((org.size() * compression.threshold)/100)) {
dest.moveFreeToData(compressedSize);
type = compression.type;
}
}
return type;
}
CompressionConfig::Type
docompress(CompressionConfig compression, const ConstBufferRef & org, DataBuffer & dest)
{
switch (compression.type) {
case CompressionConfig::LZ4:
{
LZ4Compressor lz4;
return compress(lz4, compression, org, dest);
}
case CompressionConfig::ZSTD:
{
ZStdCompressor zstd;
return compress(zstd, compression, org, dest);
}
case CompressionConfig::NONE_MULTI:
return CompressionConfig::NONE_MULTI;
case CompressionConfig::NONE:
default:
return CompressionConfig::NONE;
}
}
CompressionConfig::Type
compress(CompressionConfig::Type compression, const ConstBufferRef & org, DataBuffer & dest, bool allowSwap) {
return compress(CompressionConfig(compression), org, dest, allowSwap);
}
CompressionConfig::Type
compress(CompressionConfig compression, const ConstBufferRef & org, DataBuffer & dest, bool allowSwap)
{
CompressionConfig::Type type(CompressionConfig::NONE);
if (org.size() >= compression.minSize) {
type = docompress(compression, org, dest);
}
if ((type == CompressionConfig::NONE) || (type == CompressionConfig::NONE_MULTI)) {
if (allowSwap) {
DataBuffer tmp(const_cast<char *>(org.c_str()), org.size());
tmp.moveFreeToData(org.size());
dest.swap(tmp);
} else {
dest.writeBytes(org.c_str(), org.size());
}
}
return type;
}
void
decompress(ICompressor & decompressor, size_t uncompressedLen, const ConstBufferRef & org, DataBuffer & dest, bool allowSwap)
{
dest.ensureFree(uncompressedLen);
size_t realUncompressedLen(dest.getFreeLen());
if ( ! decompressor.unprocess(org.c_str(), org.size(), dest.getFree(), realUncompressedLen) ) {
if ( uncompressedLen < realUncompressedLen) {
if (allowSwap) {
DataBuffer tmp(const_cast<char *>(org.c_str()), org.size());
tmp.moveFreeToData(org.size());
dest.swap(tmp);
} else {
dest.writeBytes(org.c_str(), org.size());
}
} else {
throw std::runtime_error(make_string("unprocess failed had %zu, wanted %zu, got %zu",
org.size(), uncompressedLen, realUncompressedLen));
}
} else {
dest.moveFreeToData(realUncompressedLen);
}
}
void
decompress(CompressionConfig::Type type, size_t uncompressedLen, const ConstBufferRef & org, DataBuffer & dest, bool allowSwap)
{
switch (type) {
case CompressionConfig::LZ4:
{
LZ4Compressor lz4;
decompress(lz4, uncompressedLen, org, dest, allowSwap);
}
break;
case CompressionConfig::ZSTD:
{
ZStdCompressor zstd;
decompress(zstd, uncompressedLen, org, dest, allowSwap);
}
break;
case CompressionConfig::NONE:
case CompressionConfig::NONE_MULTI:
case CompressionConfig::UNCOMPRESSABLE:
if (allowSwap) {
DataBuffer tmp(const_cast<char *>(org.c_str()), org.size());
tmp.moveFreeToData(org.size());
dest.swap(tmp);
} else {
dest.writeBytes(org.c_str(), org.size());
}
break;
default:
throw std::runtime_error(make_string("Unable to handle decompression of type '%d'", type));
break;
}
}
size_t computeMaxCompressedsize(CompressionConfig::Type type, size_t payloadSize) {
if (type == CompressionConfig::LZ4) {
LZ4Compressor lz4;
return lz4.adjustProcessLen(0, payloadSize);
} else if (type == CompressionConfig::ZSTD) {
ZStdCompressor zstd;
return zstd.adjustProcessLen(0, payloadSize);
}
return payloadSize;
}
//-----------------------------------------------------------------------------
Compress::Compress(CompressionConfig config,
const char *uncompressed_data, size_t uncompressed_size)
: _space(),
_type(CompressionConfig::NONE),
_data(uncompressed_data),
_size(uncompressed_size)
{
if (config.useCompression() && (uncompressed_size >= config.minSize)) {
with_compressor(config.type, [this, &config, uncompressed_data, uncompressed_size](ICompressor &compressor)
{
size_t compressed_size = compressor.adjustProcessLen(0, uncompressed_size);
_space = alloc::Alloc::allocHeap(compressed_size);
if (compressor.process(config, uncompressed_data, uncompressed_size, _space.get(), compressed_size) &&
(compressed_size < ((uncompressed_size * config.threshold)/100)))
{
_type = config.type;
_data = static_cast<char *>(_space.get());
_size = compressed_size;
} else {
_space = alloc::Alloc::allocHeap();
}
});
}
}
Decompress::Decompress(CompressionConfig::Type type, size_t uncompressed_size,
const char *compressed_data, size_t compressed_size)
: _space(),
_data(compressed_data),
_size(compressed_size)
{
if (CompressionConfig::isCompressed(type)) {
with_compressor(type, [this, uncompressed_size, compressed_data, compressed_size](ICompressor &compressor)
{
_space = alloc::Alloc::allocHeap(uncompressed_size);
size_t produced_size = uncompressed_size;
if (compressor.unprocess(compressed_data, compressed_size, _space.get(), produced_size) &&
(uncompressed_size == produced_size))
{
_data = static_cast<char *>(_space.get());
_size = uncompressed_size;
} else {
throw std::runtime_error(make_string("unprocess failed; had %zu, wanted %zu, got %zu",
compressed_size, uncompressed_size, produced_size));
}
});
}
}
//-----------------------------------------------------------------------------
}
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