ClickHouse/utils/compressor/main.cpp
2016-06-07 11:23:15 +03:00

124 lines
3.3 KiB
C++

#include <iostream>
#include <boost/program_options.hpp>
#include <DB/IO/WriteBufferFromFileDescriptor.h>
#include <DB/IO/ReadBufferFromFileDescriptor.h>
#include <DB/IO/CompressedWriteBuffer.h>
#include <DB/IO/CompressedReadBuffer.h>
#include <DB/IO/WriteHelpers.h>
#include <DB/IO/copyData.h>
/// Выводит размеры разжатых и сжатых блоков для сжатого файла.
void stat(DB::ReadBuffer & in, DB::WriteBuffer & out)
{
while (!in.eof())
{
char header[COMPRESSED_BLOCK_HEADER_SIZE];
in.ignore(16); /// checksum
in.readStrict(header, COMPRESSED_BLOCK_HEADER_SIZE);
size_t size_compressed = 0;
memcpy(&size_compressed, &header[1], 4); /// little endian
if (size_compressed > DBMS_MAX_COMPRESSED_SIZE)
throw DB::Exception("Too large size_compressed. Most likely corrupted data.", DB::ErrorCodes::TOO_LARGE_SIZE_COMPRESSED);
size_t size_decompressed = 0;
memcpy(&size_compressed, &header[5], 4); /// little endian
DB::writeText(size_decompressed, out);
DB::writeChar('\t', out);
DB::writeText(size_compressed, out);
DB::writeChar('\n', out);
in.ignore(size_compressed - COMPRESSED_BLOCK_HEADER_SIZE);
}
}
int main(int argc, char ** argv)
{
boost::program_options::options_description desc("Allowed options");
desc.add_options()
("help,h", "produce help message")
("d,decompress", "decompress")
("block-size,b", boost::program_options::value<unsigned>()->default_value(DBMS_DEFAULT_BUFFER_SIZE), "compress in blocks of specified size")
("hc", "use LZ4HC instead of LZ4")
#ifdef USE_QUICKLZ
("qlz", "use QuickLZ (level 1) instead of LZ4")
#endif
("zstd", "use ZSTD instead of LZ4")
("stat", "print block statistics of compressed data")
;
boost::program_options::variables_map options;
boost::program_options::store(boost::program_options::parse_command_line(argc, argv, desc), options);
if (options.count("help"))
{
std::cout << "Usage: " << argv[0] << " [options] < in > out" << std::endl;
std::cout << desc << std::endl;
return 1;
}
try
{
bool decompress = options.count("d");
#ifdef USE_QUICKLZ
bool use_qlz = options.count("qlz");
#else
bool use_qlz = false;
#endif
bool use_lz4hc = options.count("hc");
bool use_zstd = options.count("zstd");
bool stat_mode = options.count("stat");
unsigned block_size = options["block-size"].as<unsigned>();
DB::CompressionMethod method = DB::CompressionMethod::LZ4;
if (use_qlz)
method = DB::CompressionMethod::QuickLZ;
else if (use_lz4hc)
method = DB::CompressionMethod::LZ4HC;
else if (use_zstd)
method = DB::CompressionMethod::ZSTD;
DB::ReadBufferFromFileDescriptor rb(STDIN_FILENO);
DB::WriteBufferFromFileDescriptor wb(STDOUT_FILENO);
if (stat_mode)
{
/// Вывести статистику для сжатого файла.
stat(rb, wb);
}
else if (decompress)
{
/// Разжатие
DB::CompressedReadBuffer from(rb);
DB::copyData(from, wb);
}
else
{
/// Сжатие
DB::CompressedWriteBuffer to(wb, method, block_size);
DB::copyData(rb, to);
}
}
catch (const DB::Exception & e)
{
std::cerr << e.what() << ", " << e.message() << std::endl
<< std::endl
<< "Stack trace:" << std::endl
<< e.getStackTrace().toString()
<< std::endl;
throw;
}
return 0;
}