mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 07:42:43 +00:00
3ec513ecf2
This improves the decompression time of `clang-15.0.7.src.tar.xz` from 41 seconds down to about 5 seconds. The reason for this very significant improvement is that LZMA, the underlying compression of XZ, fills its range decompressor one byte at a time, causing a lot of overhead at the syscall barrier.
36 lines
1 KiB
C++
36 lines
1 KiB
C++
/*
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* Copyright (c) 2023, Tim Schumacher <timschumi@gmx.de>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCompress/Xz.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("rpath stdio"));
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StringView filename;
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Core::ArgsParser args_parser;
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args_parser.set_general_help("Decompress and print an XZ archive");
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args_parser.add_positional_argument(filename, "File to decompress", "file");
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args_parser.parse(arguments);
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auto file = TRY(Core::File::open_file_or_standard_stream(filename, Core::File::OpenMode::Read));
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auto buffered_file = TRY(Core::BufferedFile::create(move(file)));
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auto stream = TRY(Compress::XzDecompressor::create(move(buffered_file)));
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// Arbitrarily chosen buffer size.
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Array<u8, 4096> buffer;
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while (!stream->is_eof()) {
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auto slice = TRY(stream->read_some(buffer));
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out("{:s}", slice);
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}
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return 0;
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}
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