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120 lines
3.5 KiB
C++
120 lines
3.5 KiB
C++
#include <iostream>
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#include <boost/program_options.hpp>
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#include <Common/Exception.h>
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#include <IO/WriteBufferFromFileDescriptor.h>
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#include <IO/ReadBufferFromFileDescriptor.h>
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#include <IO/CompressedWriteBuffer.h>
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#include <IO/CompressedReadBuffer.h>
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#include <IO/WriteHelpers.h>
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#include <IO/copyData.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int TOO_LARGE_SIZE_COMPRESSED;
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}
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}
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/// Outputs sizes of uncompressed and compressed blocks for compressed file.
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void stat(DB::ReadBuffer & in, DB::WriteBuffer & out)
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{
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while (!in.eof())
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{
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in.ignore(16); /// checksum
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char header[COMPRESSED_BLOCK_HEADER_SIZE];
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in.readStrict(header, COMPRESSED_BLOCK_HEADER_SIZE);
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UInt32 size_compressed = unalignedLoad<UInt32>(&header[1]);
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if (size_compressed > DBMS_MAX_COMPRESSED_SIZE)
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throw DB::Exception("Too large size_compressed. Most likely corrupted data.", DB::ErrorCodes::TOO_LARGE_SIZE_COMPRESSED);
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UInt32 size_decompressed = unalignedLoad<UInt32>(&header[5]);
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DB::writeText(size_decompressed, out);
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DB::writeChar('\t', out);
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DB::writeText(size_compressed, out);
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DB::writeChar('\n', out);
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in.ignore(size_compressed - COMPRESSED_BLOCK_HEADER_SIZE);
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}
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}
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int main(int argc, char ** argv)
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{
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boost::program_options::options_description desc("Allowed options");
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desc.add_options()
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("help,h", "produce help message")
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("decompress,d", "decompress")
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("block-size,b", boost::program_options::value<unsigned>()->default_value(DBMS_DEFAULT_BUFFER_SIZE), "compress in blocks of specified size")
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("hc", "use LZ4HC instead of LZ4")
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("zstd", "use ZSTD instead of LZ4")
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("none", "use no compression instead of LZ4")
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("stat", "print block statistics of compressed data")
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;
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boost::program_options::variables_map options;
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boost::program_options::store(boost::program_options::parse_command_line(argc, argv, desc), options);
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if (options.count("help"))
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{
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std::cout << "Usage: " << argv[0] << " [options] < in > out" << std::endl;
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std::cout << desc << std::endl;
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return 1;
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}
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try
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{
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bool decompress = options.count("decompress");
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bool use_lz4hc = options.count("hc");
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bool use_zstd = options.count("zstd");
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bool stat_mode = options.count("stat");
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bool use_none = options.count("none");
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unsigned block_size = options["block-size"].as<unsigned>();
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DB::CompressionMethod method = DB::CompressionMethod::LZ4;
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if (use_lz4hc)
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method = DB::CompressionMethod::LZ4HC;
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else if (use_zstd)
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method = DB::CompressionMethod::ZSTD;
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else if (use_none)
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method = DB::CompressionMethod::NONE;
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DB::ReadBufferFromFileDescriptor rb(STDIN_FILENO);
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DB::WriteBufferFromFileDescriptor wb(STDOUT_FILENO);
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if (stat_mode)
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{
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/// Output statistic for compressed file.
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stat(rb, wb);
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}
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else if (decompress)
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{
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/// Decompression
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DB::CompressedReadBuffer from(rb);
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DB::copyData(from, wb);
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}
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else
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{
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/// Compression
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DB::CompressedWriteBuffer to(wb, method, block_size);
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DB::copyData(rb, to);
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}
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}
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catch (...)
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{
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std::cerr << DB::getCurrentExceptionMessage(true);
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return DB::getCurrentExceptionCode();
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}
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return 0;
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}
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