01bcc34896
Summary:
Previously we were using -1 as the default for every library, which was legacy from our zlib options. That worked for a while, but after zstd introduced a146ee04ae, it started giving poor compression ratios by default in zstd.
This PR adds a constant to RocksDB public API, `CompressionOptions::kDefaultCompressionLevel`, which will get translated to the default value specific to the compression library being used in "util/compression.h". The constant uses a number that appears to be larger than any library's maximum compression level.
Closes https://github.com/facebook/rocksdb/pull/3895
Differential Revision: D8125780
Pulled By: ajkr
fbshipit-source-id: 2db157a89118cd4f94577c2f4a0a5ff31c8391c6
936 lines
29 KiB
C++
936 lines
29 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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//
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#pragma once
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#include <algorithm>
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#include <limits>
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#include <string>
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#include "rocksdb/options.h"
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#include "util/coding.h"
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#ifdef SNAPPY
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#include <snappy.h>
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#endif
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#ifdef ZLIB
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#include <zlib.h>
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#endif
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#ifdef BZIP2
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#include <bzlib.h>
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#endif
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#if defined(LZ4)
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#include <lz4.h>
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#include <lz4hc.h>
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#endif
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#if defined(ZSTD)
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#include <zstd.h>
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#if ZSTD_VERSION_NUMBER >= 800 // v0.8.0+
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#include <zdict.h>
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#endif // ZSTD_VERSION_NUMBER >= 800
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#endif // ZSTD
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#if defined(XPRESS)
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#include "port/xpress.h"
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#endif
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namespace rocksdb {
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inline bool Snappy_Supported() {
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#ifdef SNAPPY
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return true;
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#else
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return false;
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#endif
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}
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inline bool Zlib_Supported() {
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#ifdef ZLIB
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return true;
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#else
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return false;
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#endif
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}
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inline bool BZip2_Supported() {
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#ifdef BZIP2
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return true;
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#else
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return false;
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#endif
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}
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inline bool LZ4_Supported() {
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#ifdef LZ4
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return true;
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#else
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return false;
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#endif
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}
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inline bool XPRESS_Supported() {
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#ifdef XPRESS
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return true;
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#else
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return false;
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#endif
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}
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inline bool ZSTD_Supported() {
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#ifdef ZSTD
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// ZSTD format is finalized since version 0.8.0.
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return (ZSTD_versionNumber() >= 800);
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#else
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return false;
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#endif
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}
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inline bool ZSTDNotFinal_Supported() {
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#ifdef ZSTD
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return true;
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#else
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return false;
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#endif
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}
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inline bool CompressionTypeSupported(CompressionType compression_type) {
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switch (compression_type) {
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case kNoCompression:
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return true;
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case kSnappyCompression:
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return Snappy_Supported();
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case kZlibCompression:
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return Zlib_Supported();
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case kBZip2Compression:
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return BZip2_Supported();
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case kLZ4Compression:
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return LZ4_Supported();
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case kLZ4HCCompression:
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return LZ4_Supported();
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case kXpressCompression:
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return XPRESS_Supported();
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case kZSTDNotFinalCompression:
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return ZSTDNotFinal_Supported();
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case kZSTD:
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return ZSTD_Supported();
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default:
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assert(false);
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return false;
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}
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}
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inline std::string CompressionTypeToString(CompressionType compression_type) {
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switch (compression_type) {
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case kNoCompression:
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return "NoCompression";
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case kSnappyCompression:
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return "Snappy";
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case kZlibCompression:
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return "Zlib";
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case kBZip2Compression:
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return "BZip2";
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case kLZ4Compression:
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return "LZ4";
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case kLZ4HCCompression:
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return "LZ4HC";
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case kXpressCompression:
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return "Xpress";
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case kZSTD:
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return "ZSTD";
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case kZSTDNotFinalCompression:
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return "ZSTDNotFinal";
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default:
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assert(false);
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return "";
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}
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}
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// compress_format_version can have two values:
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// 1 -- decompressed sizes for BZip2 and Zlib are not included in the compressed
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// block. Also, decompressed sizes for LZ4 are encoded in platform-dependent
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// way.
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// 2 -- Zlib, BZip2 and LZ4 encode decompressed size as Varint32 just before the
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// start of compressed block. Snappy format is the same as version 1.
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inline bool Snappy_Compress(const CompressionOptions& /*opts*/,
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const char* input, size_t length,
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::std::string* output) {
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#ifdef SNAPPY
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output->resize(snappy::MaxCompressedLength(length));
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size_t outlen;
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snappy::RawCompress(input, length, &(*output)[0], &outlen);
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output->resize(outlen);
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return true;
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#else
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(void)input;
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(void)length;
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(void)output;
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return false;
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#endif
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}
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inline bool Snappy_GetUncompressedLength(const char* input, size_t length,
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size_t* result) {
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#ifdef SNAPPY
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return snappy::GetUncompressedLength(input, length, result);
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#else
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(void)input;
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(void)length;
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(void)result;
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return false;
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#endif
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}
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inline bool Snappy_Uncompress(const char* input, size_t length, char* output) {
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#ifdef SNAPPY
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return snappy::RawUncompress(input, length, output);
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#else
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(void)input;
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(void)length;
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(void)output;
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return false;
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#endif
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}
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namespace compression {
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// returns size
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inline size_t PutDecompressedSizeInfo(std::string* output, uint32_t length) {
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PutVarint32(output, length);
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return output->size();
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}
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inline bool GetDecompressedSizeInfo(const char** input_data,
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size_t* input_length,
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uint32_t* output_len) {
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auto new_input_data =
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GetVarint32Ptr(*input_data, *input_data + *input_length, output_len);
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if (new_input_data == nullptr) {
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return false;
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}
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*input_length -= (new_input_data - *input_data);
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*input_data = new_input_data;
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return true;
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}
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} // namespace compression
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// compress_format_version == 1 -- decompressed size is not included in the
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// block header
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// compress_format_version == 2 -- decompressed size is included in the block
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// header in varint32 format
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// @param compression_dict Data for presetting the compression library's
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// dictionary.
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inline bool Zlib_Compress(const CompressionOptions& opts,
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uint32_t compress_format_version, const char* input,
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size_t length, ::std::string* output,
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const Slice& compression_dict = Slice()) {
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#ifdef ZLIB
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if (length > std::numeric_limits<uint32_t>::max()) {
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// Can't compress more than 4GB
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return false;
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}
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size_t output_header_len = 0;
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if (compress_format_version == 2) {
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output_header_len = compression::PutDecompressedSizeInfo(
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output, static_cast<uint32_t>(length));
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}
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// Resize output to be the plain data length.
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// This may not be big enough if the compression actually expands data.
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output->resize(output_header_len + length);
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// The memLevel parameter specifies how much memory should be allocated for
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// the internal compression state.
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// memLevel=1 uses minimum memory but is slow and reduces compression ratio.
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// memLevel=9 uses maximum memory for optimal speed.
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// The default value is 8. See zconf.h for more details.
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static const int memLevel = 8;
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int level;
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if (opts.level == CompressionOptions::kDefaultCompressionLevel) {
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level = Z_DEFAULT_COMPRESSION;
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} else {
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level = opts.level;
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}
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z_stream _stream;
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memset(&_stream, 0, sizeof(z_stream));
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int st = deflateInit2(&_stream, level, Z_DEFLATED, opts.window_bits,
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memLevel, opts.strategy);
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if (st != Z_OK) {
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return false;
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}
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if (compression_dict.size()) {
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// Initialize the compression library's dictionary
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st = deflateSetDictionary(
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&_stream, reinterpret_cast<const Bytef*>(compression_dict.data()),
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static_cast<unsigned int>(compression_dict.size()));
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if (st != Z_OK) {
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deflateEnd(&_stream);
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return false;
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}
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}
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// Compress the input, and put compressed data in output.
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_stream.next_in = (Bytef*)input;
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_stream.avail_in = static_cast<unsigned int>(length);
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// Initialize the output size.
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_stream.avail_out = static_cast<unsigned int>(length);
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_stream.next_out = reinterpret_cast<Bytef*>(&(*output)[output_header_len]);
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bool compressed = false;
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st = deflate(&_stream, Z_FINISH);
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if (st == Z_STREAM_END) {
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compressed = true;
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output->resize(output->size() - _stream.avail_out);
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}
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// The only return value we really care about is Z_STREAM_END.
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// Z_OK means insufficient output space. This means the compression is
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// bigger than decompressed size. Just fail the compression in that case.
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deflateEnd(&_stream);
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return compressed;
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#else
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(void)opts;
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(void)compress_format_version;
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(void)input;
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(void)length;
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(void)output;
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(void)compression_dict;
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return false;
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#endif
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}
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// compress_format_version == 1 -- decompressed size is not included in the
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// block header
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// compress_format_version == 2 -- decompressed size is included in the block
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// header in varint32 format
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// @param compression_dict Data for presetting the compression library's
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// dictionary.
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inline char* Zlib_Uncompress(const char* input_data, size_t input_length,
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int* decompress_size,
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uint32_t compress_format_version,
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const Slice& compression_dict = Slice(),
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int windowBits = -14) {
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#ifdef ZLIB
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uint32_t output_len = 0;
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if (compress_format_version == 2) {
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if (!compression::GetDecompressedSizeInfo(&input_data, &input_length,
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&output_len)) {
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return nullptr;
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}
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} else {
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// Assume the decompressed data size will 5x of compressed size, but round
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// to the page size
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size_t proposed_output_len = ((input_length * 5) & (~(4096 - 1))) + 4096;
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output_len = static_cast<uint32_t>(
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std::min(proposed_output_len,
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static_cast<size_t>(std::numeric_limits<uint32_t>::max())));
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}
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z_stream _stream;
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memset(&_stream, 0, sizeof(z_stream));
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// For raw inflate, the windowBits should be -8..-15.
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// If windowBits is bigger than zero, it will use either zlib
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// header or gzip header. Adding 32 to it will do automatic detection.
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int st =
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inflateInit2(&_stream, windowBits > 0 ? windowBits + 32 : windowBits);
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if (st != Z_OK) {
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return nullptr;
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}
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if (compression_dict.size()) {
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// Initialize the compression library's dictionary
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st = inflateSetDictionary(
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&_stream, reinterpret_cast<const Bytef*>(compression_dict.data()),
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static_cast<unsigned int>(compression_dict.size()));
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if (st != Z_OK) {
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return nullptr;
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}
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}
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_stream.next_in = (Bytef*)input_data;
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_stream.avail_in = static_cast<unsigned int>(input_length);
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char* output = new char[output_len];
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_stream.next_out = (Bytef*)output;
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_stream.avail_out = static_cast<unsigned int>(output_len);
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bool done = false;
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while (!done) {
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st = inflate(&_stream, Z_SYNC_FLUSH);
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switch (st) {
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case Z_STREAM_END:
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done = true;
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break;
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case Z_OK: {
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// No output space. Increase the output space by 20%.
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// We should never run out of output space if
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// compress_format_version == 2
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assert(compress_format_version != 2);
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size_t old_sz = output_len;
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uint32_t output_len_delta = output_len / 5;
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output_len += output_len_delta < 10 ? 10 : output_len_delta;
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char* tmp = new char[output_len];
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memcpy(tmp, output, old_sz);
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delete[] output;
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output = tmp;
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// Set more output.
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_stream.next_out = (Bytef*)(output + old_sz);
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_stream.avail_out = static_cast<unsigned int>(output_len - old_sz);
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break;
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}
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case Z_BUF_ERROR:
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default:
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delete[] output;
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inflateEnd(&_stream);
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return nullptr;
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}
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}
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// If we encoded decompressed block size, we should have no bytes left
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assert(compress_format_version != 2 || _stream.avail_out == 0);
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*decompress_size = static_cast<int>(output_len - _stream.avail_out);
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inflateEnd(&_stream);
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return output;
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#else
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(void)input_data;
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(void)input_length;
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(void)decompress_size;
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(void)compress_format_version;
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(void)compression_dict;
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(void)windowBits;
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return nullptr;
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#endif
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}
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// compress_format_version == 1 -- decompressed size is not included in the
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// block header
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// compress_format_version == 2 -- decompressed size is included in the block
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// header in varint32 format
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inline bool BZip2_Compress(const CompressionOptions& /*opts*/,
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uint32_t compress_format_version, const char* input,
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size_t length, ::std::string* output) {
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#ifdef BZIP2
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if (length > std::numeric_limits<uint32_t>::max()) {
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// Can't compress more than 4GB
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return false;
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}
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size_t output_header_len = 0;
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if (compress_format_version == 2) {
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output_header_len = compression::PutDecompressedSizeInfo(
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output, static_cast<uint32_t>(length));
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}
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// Resize output to be the plain data length.
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// This may not be big enough if the compression actually expands data.
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output->resize(output_header_len + length);
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bz_stream _stream;
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memset(&_stream, 0, sizeof(bz_stream));
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// Block size 1 is 100K.
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// 0 is for silent.
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// 30 is the default workFactor
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int st = BZ2_bzCompressInit(&_stream, 1, 0, 30);
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if (st != BZ_OK) {
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return false;
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}
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// Compress the input, and put compressed data in output.
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_stream.next_in = (char*)input;
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_stream.avail_in = static_cast<unsigned int>(length);
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// Initialize the output size.
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_stream.avail_out = static_cast<unsigned int>(length);
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_stream.next_out = reinterpret_cast<char*>(&(*output)[output_header_len]);
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bool compressed = false;
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st = BZ2_bzCompress(&_stream, BZ_FINISH);
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if (st == BZ_STREAM_END) {
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compressed = true;
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output->resize(output->size() - _stream.avail_out);
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}
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// The only return value we really care about is BZ_STREAM_END.
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// BZ_FINISH_OK means insufficient output space. This means the compression
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// is bigger than decompressed size. Just fail the compression in that case.
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BZ2_bzCompressEnd(&_stream);
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return compressed;
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#else
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(void)compress_format_version;
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(void)input;
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(void)length;
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(void)output;
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return false;
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#endif
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}
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// compress_format_version == 1 -- decompressed size is not included in the
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// block header
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// compress_format_version == 2 -- decompressed size is included in the block
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// header in varint32 format
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inline char* BZip2_Uncompress(const char* input_data, size_t input_length,
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int* decompress_size,
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uint32_t compress_format_version) {
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#ifdef BZIP2
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uint32_t output_len = 0;
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if (compress_format_version == 2) {
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if (!compression::GetDecompressedSizeInfo(&input_data, &input_length,
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&output_len)) {
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return nullptr;
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}
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} else {
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// Assume the decompressed data size will 5x of compressed size, but round
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// to the next page size
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size_t proposed_output_len = ((input_length * 5) & (~(4096 - 1))) + 4096;
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output_len = static_cast<uint32_t>(
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std::min(proposed_output_len,
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static_cast<size_t>(std::numeric_limits<uint32_t>::max())));
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}
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bz_stream _stream;
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memset(&_stream, 0, sizeof(bz_stream));
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int st = BZ2_bzDecompressInit(&_stream, 0, 0);
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if (st != BZ_OK) {
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return nullptr;
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}
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_stream.next_in = (char*)input_data;
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_stream.avail_in = static_cast<unsigned int>(input_length);
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char* output = new char[output_len];
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_stream.next_out = (char*)output;
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_stream.avail_out = static_cast<unsigned int>(output_len);
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bool done = false;
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while (!done) {
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st = BZ2_bzDecompress(&_stream);
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switch (st) {
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|
case BZ_STREAM_END:
|
|
done = true;
|
|
break;
|
|
case BZ_OK: {
|
|
// No output space. Increase the output space by 20%.
|
|
// We should never run out of output space if
|
|
// compress_format_version == 2
|
|
assert(compress_format_version != 2);
|
|
uint32_t old_sz = output_len;
|
|
output_len = output_len * 1.2;
|
|
char* tmp = new char[output_len];
|
|
memcpy(tmp, output, old_sz);
|
|
delete[] output;
|
|
output = tmp;
|
|
|
|
// Set more output.
|
|
_stream.next_out = (char*)(output + old_sz);
|
|
_stream.avail_out = static_cast<unsigned int>(output_len - old_sz);
|
|
break;
|
|
}
|
|
default:
|
|
delete[] output;
|
|
BZ2_bzDecompressEnd(&_stream);
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
// If we encoded decompressed block size, we should have no bytes left
|
|
assert(compress_format_version != 2 || _stream.avail_out == 0);
|
|
*decompress_size = static_cast<int>(output_len - _stream.avail_out);
|
|
BZ2_bzDecompressEnd(&_stream);
|
|
return output;
|
|
#else
|
|
(void)input_data;
|
|
(void)input_length;
|
|
(void)decompress_size;
|
|
(void)compress_format_version;
|
|
return nullptr;
|
|
#endif
|
|
}
|
|
|
|
// compress_format_version == 1 -- decompressed size is included in the
|
|
// block header using memcpy, which makes database non-portable)
|
|
// compress_format_version == 2 -- decompressed size is included in the block
|
|
// header in varint32 format
|
|
// @param compression_dict Data for presetting the compression library's
|
|
// dictionary.
|
|
inline bool LZ4_Compress(const CompressionOptions& /*opts*/,
|
|
uint32_t compress_format_version, const char* input,
|
|
size_t length, ::std::string* output,
|
|
const Slice compression_dict = Slice()) {
|
|
#ifdef LZ4
|
|
if (length > std::numeric_limits<uint32_t>::max()) {
|
|
// Can't compress more than 4GB
|
|
return false;
|
|
}
|
|
|
|
size_t output_header_len = 0;
|
|
if (compress_format_version == 2) {
|
|
// new encoding, using varint32 to store size information
|
|
output_header_len = compression::PutDecompressedSizeInfo(
|
|
output, static_cast<uint32_t>(length));
|
|
} else {
|
|
// legacy encoding, which is not really portable (depends on big/little
|
|
// endianness)
|
|
output_header_len = 8;
|
|
output->resize(output_header_len);
|
|
char* p = const_cast<char*>(output->c_str());
|
|
memcpy(p, &length, sizeof(length));
|
|
}
|
|
int compress_bound = LZ4_compressBound(static_cast<int>(length));
|
|
output->resize(static_cast<size_t>(output_header_len + compress_bound));
|
|
|
|
int outlen;
|
|
#if LZ4_VERSION_NUMBER >= 10400 // r124+
|
|
LZ4_stream_t* stream = LZ4_createStream();
|
|
if (compression_dict.size()) {
|
|
LZ4_loadDict(stream, compression_dict.data(),
|
|
static_cast<int>(compression_dict.size()));
|
|
}
|
|
#if LZ4_VERSION_NUMBER >= 10700 // r129+
|
|
outlen =
|
|
LZ4_compress_fast_continue(stream, input, &(*output)[output_header_len],
|
|
static_cast<int>(length), compress_bound, 1);
|
|
#else // up to r128
|
|
outlen = LZ4_compress_limitedOutput_continue(
|
|
stream, input, &(*output)[output_header_len], static_cast<int>(length),
|
|
compress_bound);
|
|
#endif
|
|
LZ4_freeStream(stream);
|
|
#else // up to r123
|
|
outlen = LZ4_compress_limitedOutput(input, &(*output)[output_header_len],
|
|
static_cast<int>(length), compress_bound);
|
|
#endif // LZ4_VERSION_NUMBER >= 10400
|
|
|
|
if (outlen == 0) {
|
|
return false;
|
|
}
|
|
output->resize(static_cast<size_t>(output_header_len + outlen));
|
|
return true;
|
|
#else // LZ4
|
|
(void)compress_format_version;
|
|
(void)input;
|
|
(void)length;
|
|
(void)output;
|
|
(void)compression_dict;
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
// compress_format_version == 1 -- decompressed size is included in the
|
|
// block header using memcpy, which makes database non-portable)
|
|
// compress_format_version == 2 -- decompressed size is included in the block
|
|
// header in varint32 format
|
|
// @param compression_dict Data for presetting the compression library's
|
|
// dictionary.
|
|
inline char* LZ4_Uncompress(const char* input_data, size_t input_length,
|
|
int* decompress_size,
|
|
uint32_t compress_format_version,
|
|
const Slice& compression_dict = Slice()) {
|
|
#ifdef LZ4
|
|
uint32_t output_len = 0;
|
|
if (compress_format_version == 2) {
|
|
// new encoding, using varint32 to store size information
|
|
if (!compression::GetDecompressedSizeInfo(&input_data, &input_length,
|
|
&output_len)) {
|
|
return nullptr;
|
|
}
|
|
} else {
|
|
// legacy encoding, which is not really portable (depends on big/little
|
|
// endianness)
|
|
if (input_length < 8) {
|
|
return nullptr;
|
|
}
|
|
memcpy(&output_len, input_data, sizeof(output_len));
|
|
input_length -= 8;
|
|
input_data += 8;
|
|
}
|
|
|
|
char* output = new char[output_len];
|
|
#if LZ4_VERSION_NUMBER >= 10400 // r124+
|
|
LZ4_streamDecode_t* stream = LZ4_createStreamDecode();
|
|
if (compression_dict.size()) {
|
|
LZ4_setStreamDecode(stream, compression_dict.data(),
|
|
static_cast<int>(compression_dict.size()));
|
|
}
|
|
*decompress_size = LZ4_decompress_safe_continue(
|
|
stream, input_data, output, static_cast<int>(input_length),
|
|
static_cast<int>(output_len));
|
|
LZ4_freeStreamDecode(stream);
|
|
#else // up to r123
|
|
*decompress_size =
|
|
LZ4_decompress_safe(input_data, output, static_cast<int>(input_length),
|
|
static_cast<int>(output_len));
|
|
#endif // LZ4_VERSION_NUMBER >= 10400
|
|
|
|
if (*decompress_size < 0) {
|
|
delete[] output;
|
|
return nullptr;
|
|
}
|
|
assert(*decompress_size == static_cast<int>(output_len));
|
|
return output;
|
|
#else // LZ4
|
|
(void)input_data;
|
|
(void)input_length;
|
|
(void)decompress_size;
|
|
(void)compress_format_version;
|
|
(void)compression_dict;
|
|
return nullptr;
|
|
#endif
|
|
}
|
|
|
|
// compress_format_version == 1 -- decompressed size is included in the
|
|
// block header using memcpy, which makes database non-portable)
|
|
// compress_format_version == 2 -- decompressed size is included in the block
|
|
// header in varint32 format
|
|
// @param compression_dict Data for presetting the compression library's
|
|
// dictionary.
|
|
inline bool LZ4HC_Compress(const CompressionOptions& opts,
|
|
uint32_t compress_format_version, const char* input,
|
|
size_t length, ::std::string* output,
|
|
const Slice& compression_dict = Slice()) {
|
|
#ifdef LZ4
|
|
if (length > std::numeric_limits<uint32_t>::max()) {
|
|
// Can't compress more than 4GB
|
|
return false;
|
|
}
|
|
|
|
size_t output_header_len = 0;
|
|
if (compress_format_version == 2) {
|
|
// new encoding, using varint32 to store size information
|
|
output_header_len = compression::PutDecompressedSizeInfo(
|
|
output, static_cast<uint32_t>(length));
|
|
} else {
|
|
// legacy encoding, which is not really portable (depends on big/little
|
|
// endianness)
|
|
output_header_len = 8;
|
|
output->resize(output_header_len);
|
|
char* p = const_cast<char*>(output->c_str());
|
|
memcpy(p, &length, sizeof(length));
|
|
}
|
|
int compress_bound = LZ4_compressBound(static_cast<int>(length));
|
|
output->resize(static_cast<size_t>(output_header_len + compress_bound));
|
|
|
|
int outlen;
|
|
int level;
|
|
if (opts.level == CompressionOptions::kDefaultCompressionLevel) {
|
|
level = 0; // lz4hc.h says any value < 1 will be sanitized to default
|
|
} else {
|
|
level = opts.level;
|
|
}
|
|
#if LZ4_VERSION_NUMBER >= 10400 // r124+
|
|
LZ4_streamHC_t* stream = LZ4_createStreamHC();
|
|
LZ4_resetStreamHC(stream, level);
|
|
const char* compression_dict_data =
|
|
compression_dict.size() > 0 ? compression_dict.data() : nullptr;
|
|
size_t compression_dict_size = compression_dict.size();
|
|
LZ4_loadDictHC(stream, compression_dict_data,
|
|
static_cast<int>(compression_dict_size));
|
|
|
|
#if LZ4_VERSION_NUMBER >= 10700 // r129+
|
|
outlen =
|
|
LZ4_compress_HC_continue(stream, input, &(*output)[output_header_len],
|
|
static_cast<int>(length), compress_bound);
|
|
#else // r124-r128
|
|
outlen = LZ4_compressHC_limitedOutput_continue(
|
|
stream, input, &(*output)[output_header_len], static_cast<int>(length),
|
|
compress_bound);
|
|
#endif // LZ4_VERSION_NUMBER >= 10700
|
|
LZ4_freeStreamHC(stream);
|
|
|
|
#elif LZ4_VERSION_MAJOR // r113-r123
|
|
outlen = LZ4_compressHC2_limitedOutput(input, &(*output)[output_header_len],
|
|
static_cast<int>(length),
|
|
compress_bound, level);
|
|
#else // up to r112
|
|
outlen =
|
|
LZ4_compressHC_limitedOutput(input, &(*output)[output_header_len],
|
|
static_cast<int>(length), compress_bound);
|
|
#endif // LZ4_VERSION_NUMBER >= 10400
|
|
|
|
if (outlen == 0) {
|
|
return false;
|
|
}
|
|
output->resize(static_cast<size_t>(output_header_len + outlen));
|
|
return true;
|
|
#else // LZ4
|
|
(void)opts;
|
|
(void)compress_format_version;
|
|
(void)input;
|
|
(void)length;
|
|
(void)output;
|
|
(void)compression_dict;
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
#ifdef XPRESS
|
|
inline bool XPRESS_Compress(const char* input, size_t length,
|
|
std::string* output) {
|
|
return port::xpress::Compress(input, length, output);
|
|
}
|
|
#else
|
|
inline bool XPRESS_Compress(const char* /*input*/, size_t /*length*/,
|
|
std::string* /*output*/) {
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
#ifdef XPRESS
|
|
inline char* XPRESS_Uncompress(const char* input_data, size_t input_length,
|
|
int* decompress_size) {
|
|
return port::xpress::Decompress(input_data, input_length, decompress_size);
|
|
}
|
|
#else
|
|
inline char* XPRESS_Uncompress(const char* /*input_data*/,
|
|
size_t /*input_length*/,
|
|
int* /*decompress_size*/) {
|
|
return nullptr;
|
|
}
|
|
#endif
|
|
|
|
// @param compression_dict Data for presetting the compression library's
|
|
// dictionary.
|
|
inline bool ZSTD_Compress(const CompressionOptions& opts, const char* input,
|
|
size_t length, ::std::string* output,
|
|
const Slice& compression_dict = Slice()) {
|
|
#ifdef ZSTD
|
|
if (length > std::numeric_limits<uint32_t>::max()) {
|
|
// Can't compress more than 4GB
|
|
return false;
|
|
}
|
|
|
|
size_t output_header_len = compression::PutDecompressedSizeInfo(
|
|
output, static_cast<uint32_t>(length));
|
|
|
|
size_t compressBound = ZSTD_compressBound(length);
|
|
output->resize(static_cast<size_t>(output_header_len + compressBound));
|
|
size_t outlen;
|
|
int level;
|
|
if (opts.level == CompressionOptions::kDefaultCompressionLevel) {
|
|
// 3 is the value of ZSTD_CLEVEL_DEFAULT (not exposed publicly), see
|
|
// https://github.com/facebook/zstd/issues/1148
|
|
level = 3;
|
|
} else {
|
|
level = opts.level;
|
|
}
|
|
#if ZSTD_VERSION_NUMBER >= 500 // v0.5.0+
|
|
ZSTD_CCtx* context = ZSTD_createCCtx();
|
|
outlen = ZSTD_compress_usingDict(
|
|
context, &(*output)[output_header_len], compressBound, input, length,
|
|
compression_dict.data(), compression_dict.size(), level);
|
|
ZSTD_freeCCtx(context);
|
|
#else // up to v0.4.x
|
|
outlen = ZSTD_compress(&(*output)[output_header_len], compressBound, input,
|
|
length, level);
|
|
#endif // ZSTD_VERSION_NUMBER >= 500
|
|
if (outlen == 0) {
|
|
return false;
|
|
}
|
|
output->resize(output_header_len + outlen);
|
|
return true;
|
|
#else // ZSTD
|
|
(void)opts;
|
|
(void)input;
|
|
(void)length;
|
|
(void)output;
|
|
(void)compression_dict;
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
// @param compression_dict Data for presetting the compression library's
|
|
// dictionary.
|
|
inline char* ZSTD_Uncompress(const char* input_data, size_t input_length,
|
|
int* decompress_size,
|
|
const Slice& compression_dict = Slice()) {
|
|
#ifdef ZSTD
|
|
uint32_t output_len = 0;
|
|
if (!compression::GetDecompressedSizeInfo(&input_data, &input_length,
|
|
&output_len)) {
|
|
return nullptr;
|
|
}
|
|
|
|
char* output = new char[output_len];
|
|
size_t actual_output_length;
|
|
#if ZSTD_VERSION_NUMBER >= 500 // v0.5.0+
|
|
ZSTD_DCtx* context = ZSTD_createDCtx();
|
|
actual_output_length = ZSTD_decompress_usingDict(
|
|
context, output, output_len, input_data, input_length,
|
|
compression_dict.data(), compression_dict.size());
|
|
ZSTD_freeDCtx(context);
|
|
#else // up to v0.4.x
|
|
actual_output_length =
|
|
ZSTD_decompress(output, output_len, input_data, input_length);
|
|
#endif // ZSTD_VERSION_NUMBER >= 500
|
|
assert(actual_output_length == output_len);
|
|
*decompress_size = static_cast<int>(actual_output_length);
|
|
return output;
|
|
#else // ZSTD
|
|
(void)input_data;
|
|
(void)input_length;
|
|
(void)decompress_size;
|
|
(void)compression_dict;
|
|
return nullptr;
|
|
#endif
|
|
}
|
|
|
|
inline std::string ZSTD_TrainDictionary(const std::string& samples,
|
|
const std::vector<size_t>& sample_lens,
|
|
size_t max_dict_bytes) {
|
|
// Dictionary trainer is available since v0.6.1, but ZSTD was marked stable
|
|
// only since v0.8.0. For now we enable the feature in stable versions only.
|
|
#if ZSTD_VERSION_NUMBER >= 800 // v0.8.0+
|
|
std::string dict_data(max_dict_bytes, '\0');
|
|
size_t dict_len = ZDICT_trainFromBuffer(
|
|
&dict_data[0], max_dict_bytes, &samples[0], &sample_lens[0],
|
|
static_cast<unsigned>(sample_lens.size()));
|
|
if (ZDICT_isError(dict_len)) {
|
|
return "";
|
|
}
|
|
assert(dict_len <= max_dict_bytes);
|
|
dict_data.resize(dict_len);
|
|
return dict_data;
|
|
#else // up to v0.7.x
|
|
assert(false);
|
|
(void)samples;
|
|
(void)sample_lens;
|
|
(void)max_dict_bytes;
|
|
return "";
|
|
#endif // ZSTD_VERSION_NUMBER >= 800
|
|
}
|
|
|
|
inline std::string ZSTD_TrainDictionary(const std::string& samples,
|
|
size_t sample_len_shift,
|
|
size_t max_dict_bytes) {
|
|
// Dictionary trainer is available since v0.6.1, but ZSTD was marked stable
|
|
// only since v0.8.0. For now we enable the feature in stable versions only.
|
|
#if ZSTD_VERSION_NUMBER >= 800 // v0.8.0+
|
|
// skips potential partial sample at the end of "samples"
|
|
size_t num_samples = samples.size() >> sample_len_shift;
|
|
std::vector<size_t> sample_lens(num_samples, size_t(1) << sample_len_shift);
|
|
return ZSTD_TrainDictionary(samples, sample_lens, max_dict_bytes);
|
|
#else // up to v0.7.x
|
|
assert(false);
|
|
(void)samples;
|
|
(void)sample_len_shift;
|
|
(void)max_dict_bytes;
|
|
return "";
|
|
#endif // ZSTD_VERSION_NUMBER >= 800
|
|
}
|
|
|
|
} // namespace rocksdb
|