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ba0d46e31a
Given an empty file, gzip would try to create a zero-size memory mapping of that file, which would fail with EINVAL.
87 lines
3.1 KiB
C++
87 lines
3.1 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 <LibCompress/Gzip.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/FileStream.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");
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args_parser.parse(arguments);
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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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String output_filename;
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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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output_filename = input_filename.substring_view(0, input_filename.length() - ".gz"sv.length());
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} else {
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output_filename = String::formatted("{}.gz", input_filename);
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}
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// We map the whole file instead of streaming to reduce size overhead (gzip header) and increase the deflate block size (better compression)
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// TODO: automatically fallback to buffered streaming for very large files
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RefPtr<Core::MappedFile> file;
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ReadonlyBytes input_bytes;
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if (TRY(Core::System::stat(input_filename)).st_size > 0) {
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file = TRY(Core::MappedFile::map(input_filename));
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input_bytes = file->bytes();
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}
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AK::Optional<ByteBuffer> output_bytes;
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if (decompress)
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output_bytes = Compress::GzipDecompressor::decompress_all(input_bytes);
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else
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output_bytes = Compress::GzipCompressor::compress_all(input_bytes);
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if (!output_bytes.has_value()) {
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warnln("Failed gzip {} input file", decompress ? "decompressing"sv : "compressing"sv);
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return 1;
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}
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auto success = false;
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if (write_to_stdout) {
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auto stdout = Core::OutputFileStream { Core::File::standard_output() };
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success = stdout.write_or_error(output_bytes.value());
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} else {
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auto output_stream_result = Core::OutputFileStream::open(output_filename);
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if (output_stream_result.is_error()) {
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warnln("Failed opening output file for writing: {}", output_stream_result.error());
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return 1;
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}
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success = output_stream_result.value().write_or_error(output_bytes.value());
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}
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if (!success) {
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warnln("Failed writing to output");
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return 1;
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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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}
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return 0;
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}
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