/// <summary>
/// Reads sector data and returns a sector object. The stream must be positioned at the first byte of the sector payload
/// data. On exit the stream will be positioned on the first byte following the sector payload CRC.
/// </summary>
/// <param name="info">Sector meta-information.</param>
/// <returns>A sector object.</returns>
private HfeSector GetSectorData(HfeSectorInfo info)
{
Sync();
var blockId = trackStream.ReadByte();
if (blockId == -1)
{
return(null);
}
if (blockId != DataAddressMark)
{
throw new DiskImageFormatException(String.Format("Unexpected block type {0}", blockId));
}
var data = new byte[info.Size];
IOUtils.ReadBlock(trackStream, data, 0, info.Size);
var crc1 = trackStream.ReadByte();
var crc2 = trackStream.ReadByte();
if (crc2 == -1)
{
throw new EndOfStreamException();
}
var crc = (crc1 << 8) | crc2;
// TODO Verify disk sector CRC
return(new HfeSector(info.Head, info.Track, info.Sector, data, 0, data.Length));
}
public void EncodeSectorIdRecord()
{
var sectorInfo = new HfeSectorInfo(0, 1, 1, 256);
var idRecord = new byte[] { 0xfe, 0x01, 0x00, 0x01, 0x01, 0x8c, 0xb8 };
var encoded = sectorInfo.Encode();
Assert.AreEqual(idRecord.Length, encoded.Length);
for (var i = 0; i < idRecord.Length; i++ )
Assert.AreEqual(idRecord[i], encoded[i]);
}
public void CalculateCrc()
{
var sectorInfo = new HfeSectorInfo(0, 1, 1, 256);
Assert.AreEqual((uint) 0x8cb8, sectorInfo.Crc);
}