Method readImage

lib/imagereader/imdimagereader.cc:140–463

clang-format off * IMAGE FILE FORMAT * The overall layout of an ImageDisk .IMD image file is: * IMD v.vv: dd/mm/yyyy hh:mm:ss * Comment (ASCII only - unlimited size) * 1A byte - ASCII EOF character * - For each track on the disk: * 1 byte Mode value (0-5) see getModulationspeed for definition * 1 byte Cylinder (0-n) * 1 byte Head (0-1)

     */
    // clang-format on
    std::unique_ptr<Image> readImage() override
    {
        // Read File
        std::ifstream inputFile(
            _config.filename(), std::ios::in | std::ios::binary);
        if (!inputFile.is_open())
            error("IMD: cannot open input file");
        // define some variables
        bool fm = false; // define coding just to show in comment for setting
                         // the right write parameters
        inputFile.seekg(0, inputFile.end);
        int inputFileSize = inputFile.tellg(); // determine filesize
        inputFile.seekg(0, inputFile.beg);
        Bytes data;
        data.writer() += inputFile;
        ByteReader br(data);
        std::unique_ptr<Image> image(new Image);
        TrackHeader header = {0, 0, 0, 0, 0};
        TrackHeader previousheader = {0, 0, 0, 0, 0};

        auto layout = _extraConfig.mutable_layout();

        unsigned n = 0;
        unsigned headerPtr = 0;
        unsigned Modulation_Speed = 0;
        unsigned sectorSize = 0;
        std::string sector_skew;

        int b;
        std::string comment;
        bool blnOptionalCylinderMap = false;
        bool blnOptionalHeadMap = false;
        int trackSectorSize = -1;
        // Read comment
        comment.clear();
        while ((b = br.read_8()) != EOF && b != END_OF_FILE)
        {
            comment.push_back(b);
            n++;
        }
        headerPtr = n; // set pointer to after comment
        log("Comment in IMD file: {}", comment);

        for (;;)
        {
            if (headerPtr >= inputFileSize - 1)
            {
                break;
            }
            // first read header
            header.ModeValue = br.read_8();
            headerPtr++;
            Modulation_Speed = getModulationandSpeed(header.ModeValue, &fm);
            header.track = br.read_8();
            headerPtr++;
            header.Head = br.read_8();
            headerPtr++;
            header.numSectors = br.read_8();