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