jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2020, the SerenityOS developers.
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <LibCompress/Gzip.h>
8#include <LibCore/ArgsParser.h>
9#include <LibCore/File.h>
10#include <LibCore/System.h>
11#include <LibMain/Main.h>
12#include <unistd.h>
13
14static ErrorOr<void> decompress_file(NonnullOwnPtr<Core::File> input_stream, Stream& output_stream)
15{
16 auto gzip_stream = Compress::GzipDecompressor { move(input_stream) };
17
18 auto buffer = TRY(ByteBuffer::create_uninitialized(4096));
19 while (!gzip_stream.is_eof()) {
20 auto span = TRY(gzip_stream.read_some(buffer));
21 TRY(output_stream.write_until_depleted(span));
22 }
23
24 return {};
25}
26
27ErrorOr<int> serenity_main(Main::Arguments args)
28{
29 Vector<StringView> filenames;
30 bool keep_input_files { false };
31 bool write_to_stdout { false };
32
33 Core::ArgsParser args_parser;
34 args_parser.add_option(keep_input_files, "Keep (don't delete) input files", "keep", 'k');
35 args_parser.add_option(write_to_stdout, "Write to stdout, keep original files unchanged", "stdout", 'c');
36 args_parser.add_positional_argument(filenames, "File to decompress", "FILE");
37 args_parser.parse(args);
38
39 if (write_to_stdout)
40 keep_input_files = true;
41
42 for (auto filename : filenames) {
43
44 DeprecatedString input_filename;
45 DeprecatedString output_filename;
46 if (filename.ends_with(".gz"sv)) {
47 input_filename = filename;
48 output_filename = filename.substring_view(0, filename.length() - 3);
49 } else {
50 input_filename = DeprecatedString::formatted("{}.gz", filename);
51 output_filename = filename;
52 }
53
54 auto input_stream_result = TRY(Core::File::open(input_filename, Core::File::OpenMode::Read));
55 auto output_stream = write_to_stdout ? TRY(Core::File::standard_output()) : TRY(Core::File::open(output_filename, Core::File::OpenMode::Write));
56
57 TRY(decompress_file(move(input_stream_result), *output_stream));
58
59 if (!keep_input_files)
60 TRY(Core::System::unlink(input_filename));
61 }
62 return 0;
63}