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/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCompress/Gzip.h>
#include <LibCore/ArgsParser.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");
args_parser.parse(arguments);
if (write_to_stdout)
keep_input_files = true;
for (auto const& input_filename : filenames) {
DeprecatedString output_filename;
if (decompress) {
if (!input_filename.ends_with(".gz"sv)) {
warnln("unknown suffix for: {}, skipping", input_filename);
continue;
}
output_filename = input_filename.substring_view(0, input_filename.length() - ".gz"sv.length());
} else {
output_filename = DeprecatedString::formatted("{}.gz", input_filename);
}
// We map the whole file instead of streaming to reduce size overhead (gzip header) and increase the deflate block size (better compression)
// TODO: automatically fallback to buffered streaming for very large files
RefPtr<Core::MappedFile> file;
ReadonlyBytes input_bytes;
if (TRY(Core::System::stat(input_filename)).st_size > 0) {
file = TRY(Core::MappedFile::map(input_filename));
input_bytes = file->bytes();
}
ByteBuffer output_bytes;
if (decompress)
output_bytes = TRY(Compress::GzipDecompressor::decompress_all(input_bytes));
else
output_bytes = TRY(Compress::GzipCompressor::compress_all(input_bytes));
auto output_stream = write_to_stdout ? TRY(Core::Stream::File::standard_output()) : TRY(Core::Stream::File::open(output_filename, Core::Stream::OpenMode::Write));
TRY(output_stream->write_entire_buffer(output_bytes));
if (!keep_input_files) {
TRY(Core::System::unlink(input_filename));
}
}
return 0;
}
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