Function uncompressFile

src/OpenLoco/src/CommandLine.cpp:457–542

    }

    static int uncompressFile(const CommandLineOptions& options)
    {
        using namespace S5;

        if (options.path.empty())
        {
            Logging::error("No file specified.");
            return EXIT_FAILURE;
        }

        try
        {
            auto path = fs::u8path(options.path);

            // Copy the whole input file into memory to allow writing over input file
            MemoryStream ms;
            {
                FileStream fsInput(path, StreamMode::read);
                ms.resize(fsInput.getLength());
                fsInput.read(ms.data(), fsInput.getLength());
            }
            SawyerStreamReader reader(ms);

            auto outputPath = options.outputPath;
            if (outputPath.empty())
            {
                outputPath = options.path;
            }

            FileStream fsOutput(outputPath, StreamMode::write);
            SawyerStreamWriter writer(fsOutput);

            if (!reader.validateChecksum())
            {
                throw Exception::RuntimeError("Invalid checksum");
            }

            // Header chunk
            Header header;
            reader.readChunk(&header, sizeof(header));
            writer.writeChunk(SawyerEncoding::uncompressed, header);

            // Optional save details chunk
            if (header.hasFlags(HeaderFlags::hasSaveDetails))
            {
                auto saveDetails = std::make_unique<SaveDetails>();
                reader.readChunk(saveDetails.get(), sizeof(SaveDetails));
                writer.writeChunk(SawyerEncoding::uncompressed, *saveDetails);
            }

            // Packed objects
            for (auto i = 0; i < header.numPackedObjects; i++)
            {
                ObjectHeader object;
                reader.read(&object, sizeof(ObjectHeader));
                writer.write(&object, sizeof(ObjectHeader));

                auto chunk = reader.readChunk();