gzip.cpp 3.2 KB

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  1. /*
  2. * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
  3. *
  4. * SPDX-License-Identifier: BSD-2-Clause
  5. */
  6. #include <LibCompress/Gzip.h>
  7. #include <LibCore/ArgsParser.h>
  8. #include <LibCore/FileStream.h>
  9. #include <LibCore/MappedFile.h>
  10. #include <LibCore/System.h>
  11. #include <LibMain/Main.h>
  12. #include <unistd.h>
  13. ErrorOr<int> serenity_main(Main::Arguments arguments)
  14. {
  15. Vector<StringView> filenames;
  16. bool keep_input_files { false };
  17. bool write_to_stdout { false };
  18. bool decompress { false };
  19. Core::ArgsParser args_parser;
  20. args_parser.add_option(keep_input_files, "Keep (don't delete) input files", "keep", 'k');
  21. args_parser.add_option(write_to_stdout, "Write to stdout, keep original files unchanged", "stdout", 'c');
  22. args_parser.add_option(decompress, "Decompress", "decompress", 'd');
  23. args_parser.add_positional_argument(filenames, "Files", "FILES");
  24. args_parser.parse(arguments);
  25. if (write_to_stdout)
  26. keep_input_files = true;
  27. for (auto const& input_filename : filenames) {
  28. DeprecatedString output_filename;
  29. if (decompress) {
  30. if (!input_filename.ends_with(".gz"sv)) {
  31. warnln("unknown suffix for: {}, skipping", input_filename);
  32. continue;
  33. }
  34. output_filename = input_filename.substring_view(0, input_filename.length() - ".gz"sv.length());
  35. } else {
  36. output_filename = DeprecatedString::formatted("{}.gz", input_filename);
  37. }
  38. // We map the whole file instead of streaming to reduce size overhead (gzip header) and increase the deflate block size (better compression)
  39. // TODO: automatically fallback to buffered streaming for very large files
  40. RefPtr<Core::MappedFile> file;
  41. ReadonlyBytes input_bytes;
  42. if (TRY(Core::System::stat(input_filename)).st_size > 0) {
  43. file = TRY(Core::MappedFile::map(input_filename));
  44. input_bytes = file->bytes();
  45. }
  46. AK::Optional<ByteBuffer> output_bytes;
  47. if (decompress)
  48. output_bytes = TRY(Compress::GzipDecompressor::decompress_all(input_bytes));
  49. else
  50. output_bytes = Compress::GzipCompressor::compress_all(input_bytes);
  51. if (!output_bytes.has_value()) {
  52. warnln("Failed gzip {} input file", decompress ? "decompressing"sv : "compressing"sv);
  53. return 1;
  54. }
  55. auto success = false;
  56. if (write_to_stdout) {
  57. auto stdout = Core::OutputFileStream { Core::File::standard_output() };
  58. success = stdout.write_or_error(output_bytes.value());
  59. } else {
  60. auto output_stream_result = Core::OutputFileStream::open(output_filename);
  61. if (output_stream_result.is_error()) {
  62. warnln("Failed opening output file for writing: {}", output_stream_result.error());
  63. return 1;
  64. }
  65. success = output_stream_result.value().write_or_error(output_bytes.value());
  66. }
  67. if (!success) {
  68. warnln("Failed writing to output");
  69. return 1;
  70. }
  71. if (!keep_input_files) {
  72. TRY(Core::System::unlink(input_filename));
  73. }
  74. }
  75. return 0;
  76. }