public override int Read(byte[] buffer, int offset, int count)
{
uint numSectors = (uint)Utilities.RoundToSector(count);
// We read by whole sectors only, so check if the count is a multiple of the sector size
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
// Read as much as required
// We will read as much sectors as needed, but always up to a whole sector
byte[] completeBuffer = new byte[numSectors * Utilities.SectorSize];
// Read the bytes requested
if (ODD.ReadWithRetry(completeBuffer, _sectorPosition, numSectors) == false)
{
// Abort here, this won't work...
throw new BadReadException("Can't read sectors at position " + _sectorPosition +
". Please check the disc for errors");
}
Array.Copy(completeBuffer, _positionInSector + offset, buffer, offset, count);
PatchBuffer(buffer, count);
SetPosition(_position + count);
return(count);
}
private static byte[] MakeData2Random(byte[] data2)
{
byte[] d2 = new byte[data2.Length];
ODD.AESDecrypt(Utilities.D2_KEY, Utilities.D2_IV, data2, 0, data2.Length, d2, 0);
// Fetch the last 4 bytes
int val = BitConverter.ToInt32(d2, 12);
if (val == 0)
{
return(data2);
}
// Fill the last part with a 1, and let the iso builder fill it with crap
int newval = new Random().Next(1, 0x1FFFFF);
byte[] rnd = BitConverter.GetBytes(newval).Swap();
Array.Copy(rnd, 0, d2, 12, rnd.Length);
ODD.AESEncrypt(Utilities.D2_KEY, Utilities.D2_IV, d2, 0, d2.Length, data2, 0);
return(data2);
}
public DiscStream(ODD odd)
{
_cdb = ODD.CDB;
_odd = odd;
byte[] picData = new byte[0x73];
byte[] data1 = new byte[0x10];
byte[] data2 = new byte[0x10];
if (_cdb.DoReadPICZone(picData) != CDB.IoResult.OK)
{
throw new BadReadException("Can't read PIC data");
}
PicData = picData;
// Establish the session with the DVD drive
if (odd.EstablishSessionKeys(0, ODD.Key1, ODD.Key2) == false)
{
throw new AuthenticationException("Can't authenticate with the drive for D1/D2 extraction.");
}
if (odd.GetData(data1, data2) == false)
{
throw new AuthenticationException("Can't extract D1/D2 values");
}
if (odd.EstablishSessionKeys(1, _odd.FixedKey30, _odd.FixedKey31) == false)
{
throw new AuthenticationException("Can't authenticate with the drive for data extraction.");
}
Data1 = data1;
Data2 = data2;
uint NumSectors = odd.GetNumSectors();
_length = NumSectors * Utilities.SectorSize;
_cdb.DoSetCDROMSpeed(0xFFFF);
}
