/// <summary>
/// Returns the sector skip bytes
/// </summary>
public override SectorList GetSectorList(int track)
{
SectorList list = new SectorList();
int sp = 0;
// set the sector lists IDAM table pointer
list.IDAMTablePointer = track * TrackLength + DISK_HEADER_LEN;
// walk each pointer pair in the IDAM table, find the sector, pull
// the sectors number and record it in the list.
for (int s = 0; s < 18; s++)
{
// read IDAM pointer values (little endian format)
int idx = list.IDAMTablePointer + s * 2;
int lsb = RawData [idx];
int msb = RawData [idx + 1];
// clear control bits
msb &= 0x1f;
// point at the sector header
sp = (msb * 256) + lsb + list.IDAMTablePointer;
// copy sector skip data
// sp is the sector pointer
// RawData [sp +3] gets the sectors logical number
// s + 1 is the physical sector number
list.Add(new SectorEntry(sp, RawData [sp + 3], s + 1));
}
return(list);
}
/// <summary>
/// Converts a track and sector to an index position in the raw data. This index
/// points to the start of the sector and includes the 45 byte sector header.
/// </summary>
/// <param name="track">0 to x</param>
/// <param name="logicalSector">1 to 18</param>
/// <returns></returns>
protected virtual int MapTrackSectorToIndex(int track, int logicalSector)
{
SectorList sectors = GetSectorList(track);
SectorEntry sector = sectors.Find(s => s.LogicalNumber == logicalSector);
return(sector.SectorStart);
}
