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Utilities: Add gzip utility

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This is a small utility that is similar to gunzip but is used
for compression instead of decompression.
This commit is contained in:
Idan Horowitz 2021-03-27 16:11:13 +03:00 committed by Andreas Kling
parent 9734420dfa
commit ff32002f2b
Notes: sideshowbarker 2024-07-18 21:01:20 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/ff32002f2b6
Pull-request: https://github.com/SerenityOS/serenity/pull/5973
2 changed files with 93 additions and 0 deletions
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1
Userland/Utilities/CMakeLists.txt
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@ -51,6 +51,7 @@ target_link_libraries(tt LibPthread)
target_link_libraries(grep LibRegex)
target_link_libraries(zip LibArchive LibCompress LibCrypto)
target_link_libraries(unzip LibArchive LibCompress)
target_link_libraries(gzip LibCompress)
target_link_libraries(gunzip LibCompress)
target_link_libraries(CppParserTest LibCpp LibGUI)
target_link_libraries(PreprocessorTest LibCpp LibGUI)

92
Userland/Utilities/gzip.cpp Normal file
View file

@ -0,0 +1,92 @@
/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/MappedFile.h>
#include <LibCompress/Gzip.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/FileStream.h>
#include <unistd.h>
int main(int argc, char** argv)
{
Vector<const char*> filenames;
bool keep_input_files { false };
bool write_to_stdout { 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.parse(argc, argv);
if (write_to_stdout)
keep_input_files = true;
for (const String& input_filename : filenames) {
auto 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
auto file_or_error = MappedFile::map(input_filename);
if (file_or_error.is_error()) {
warnln("Failed opening input file for reading: {}", file_or_error.error());
return 1;
}
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");
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());
} 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());
}
if (!success) {
warnln("Failed writing compressed file to output");
return 1;
}
if (!keep_input_files) {
const auto retval = unlink(input_filename.characters());
if (retval != 0) {
warnln("Failed removing input file");
return 1;
}
}
}
return 0;
}