/// <summary>
/// Retrieve Volume table of contents.
/// </summary>
/// <param name="diskImage"></param>
/// <returns></returns>
public VolumeTableOfContents GetVolumeTableOfContents(Stream diskImage)
{
//var diskTracks = 35;
var trackSectors = 16;
var sectorLength = 256;
var trackNumber = 0x11;
var sectorNumber = 0;
var vtocLocation = trackNumber * trackSectors * sectorLength + sectorNumber * sectorLength;
diskImage.Position = vtocLocation;
var sector = new byte[sectorLength];
Span <byte> sectorSpan = sector;
var read = diskImage.Read(sectorSpan);
var vtoc = new VolumeTableOfContents(sectorSpan.Slice(0, read));
return(vtoc);
}
//private byte[] _data;
public IEnumerable <CatalogEntry> GetCatalogs(Stream diskImage, VolumeTableOfContents vtoc)
{
var catalogTrack = vtoc.FirstCatalogTrack;
var catalogSector = vtoc.FirstCatalogSector;
var trackSectors = vtoc.NumberOfSectorsPerTrack;
var sectorLength = vtoc.NumberOfBytesPerSector;
nextCatalog:
var catalogLocation = catalogTrack * trackSectors * sectorLength + catalogSector * sectorLength;
var catalogSpan = new byte[sectorLength];
diskImage.Position = catalogLocation;
diskImage.Read(catalogSpan, 0, 0);
var catalog = new CatalogEntry
{
// Unused0 = catalogSpan[0x0],
NextCatalogTrack = catalogSpan[0x01],
NextSectorTrack = catalogSpan[0x02],
//Unused3_A = sectorSpan.Slice(0x03, 0x0a - 0x03 + 1).ToArray(),
FileEntries = GetFileEntries(diskImage, catalogSpan, 0x0b, 0x2e, 0x51, 0x74, 0x97, 0xba, 0xdd),
};
yield return(catalog);
Console.WriteLine($"Catalog: {catalog}");
if (catalog.NextCatalogTrack != 0 && catalog.NextSectorTrack != 0)
{
catalogTrack = catalog.NextCatalogTrack;
catalogSector = catalog.NextSectorTrack;
goto nextCatalog;
}
}
