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5b34b4af14
Now both /bin/zcat and /bin/gunzip are symlinks to /bin/gzip, and we essentially running it in decompression mode through these symlinks. This ensures we don't maintain 2 versions of code to decompress Gzipped data anymore, and handle the use case of gzipped-streaming input only once in the codebase.
93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
/*
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/ByteString.h>
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#include <AK/LexicalPath.h>
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#include <LibCompress/Gzip.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <LibCore/MappedFile.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <unistd.h>
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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Vector<StringView> filenames;
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bool keep_input_files { false };
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bool write_to_stdout { false };
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bool decompress { false };
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Core::ArgsParser args_parser;
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args_parser.add_option(keep_input_files, "Keep (don't delete) input files", "keep", 'k');
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args_parser.add_option(write_to_stdout, "Write to stdout, keep original files unchanged", "stdout", 'c');
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args_parser.add_option(decompress, "Decompress", "decompress", 'd');
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args_parser.add_positional_argument(filenames, "Files", "FILES", Core::ArgsParser::Required::No);
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args_parser.parse(arguments);
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auto program_name = LexicalPath::basename(arguments.strings[0]);
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// NOTE: If the user run this program via the /bin/zcat or /bin/gunzip symlink,
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// then emulate gzip decompression.
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if (program_name == "zcat"sv || program_name == "gunzip"sv)
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decompress = true;
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if (program_name == "zcat"sv)
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write_to_stdout = true;
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if (filenames.is_empty()) {
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filenames.append("-"sv);
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write_to_stdout = true;
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}
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if (write_to_stdout)
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keep_input_files = true;
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for (auto const& input_filename : filenames) {
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OwnPtr<Stream> output_stream;
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if (write_to_stdout) {
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output_stream = TRY(Core::File::standard_output());
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} else if (decompress) {
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if (!input_filename.ends_with(".gz"sv)) {
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warnln("unknown suffix for: {}, skipping", input_filename);
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continue;
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}
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auto output_filename = input_filename.substring_view(0, input_filename.length() - ".gz"sv.length());
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output_stream = TRY(Core::File::open(output_filename, Core::File::OpenMode::Write));
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} else {
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auto output_filename = ByteString::formatted("{}.gz", input_filename);
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output_stream = TRY(Core::File::open(output_filename, Core::File::OpenMode::Write));
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}
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VERIFY(output_stream);
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NonnullOwnPtr<Core::File> input_file = TRY(Core::File::open_file_or_standard_stream(input_filename, Core::File::OpenMode::Read));
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// Buffer reads, which yields a significant performance improvement.
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NonnullOwnPtr<Stream> input_stream = TRY(Core::InputBufferedFile::create(move(input_file), 1 * MiB));
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if (decompress) {
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input_stream = TRY(try_make<Compress::GzipDecompressor>(move(input_stream)));
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} else {
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output_stream = TRY(try_make<Compress::GzipCompressor>(output_stream.release_nonnull()));
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}
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auto buffer = TRY(ByteBuffer::create_uninitialized(1 * MiB));
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while (!input_stream->is_eof()) {
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auto span = TRY(input_stream->read_some(buffer));
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TRY(output_stream->write_until_depleted(span));
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}
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if (!keep_input_files)
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TRY(Core::System::unlink(input_filename));
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}
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return 0;
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}
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