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Utilities: Add -d option to gzip

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This option specifies that we should perform decompression instead of
compression.
This commit is contained in:
Itamar 2021-08-22 16:30:13 +03:00 • committed by Andreas Kling
parent e4f040147f
commit f5b69dce0b
1 changed files with 25 additions and 8 deletions
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33
Userland/Utilities/gzip.cpp
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@ -15,18 +15,29 @@ int main(int argc, char** argv)
Vector<String> 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_positional_argument(filenames, "File to compress", "FILE");
args_parser.add_option(decompress, "Decompress", "decompress", 'd');
args_parser.add_positional_argument(filenames, "Files", "FILES");
args_parser.parse(argc, argv);
if (write_to_stdout)
keep_input_files = true;
for (auto const& input_filename : filenames) {
auto output_filename = String::formatted("{}.gz", input_filename);
String output_filename;
if (decompress) {
if (!input_filename.ends_with(".gz"sv)) {
warnln("unknown suffix for: {}, skipping", input_filename);
continue;
}
output_filename = input_filename.substring(0, input_filename.length() - ".gz"sv.length());
} else {
output_filename = String::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
@ -37,26 +48,32 @@ int main(int argc, char** argv)
}
auto file = file_or_error.value();
auto compressed_file = Compress::GzipCompressor::compress_all(file->bytes());
if (!compressed_file.has_value()) {
warnln("Failed gzip compressing input file");
AK::Optional<ByteBuffer> output_bytes;
if (decompress) {
output_bytes = Compress::GzipDecompressor::decompress_all(file->bytes());
} else {
output_bytes = Compress::GzipCompressor::compress_all(file->bytes());
}
if (!output_bytes.has_value()) {
warnln("Failed gzip {} input file", decompress ? "decompressing"sv : "compressing"sv);
return 1;
}
auto success = false;
if (write_to_stdout) {
auto stdout = Core::OutputFileStream { Core::File::standard_output() };
success = stdout.write_or_error(compressed_file.value());
success = stdout.write_or_error(output_bytes.value());
} else {
auto output_stream_result = Core::OutputFileStream::open(output_filename);
if (output_stream_result.is_error()) {
warnln("Failed opening output file for writing: {}", output_stream_result.error());
return 1;
}
success = output_stream_result.value().write_or_error(compressed_file.value());
success = output_stream_result.value().write_or_error(output_bytes.value());
}
if (!success) {
warnln("Failed writing compressed file to output");
warnln("Failed writing to output");
return 1;
}