public static void FixSector(CdromSector sector)
{
switch (sector.Mode)
{
case CdromSectorMode.Mode1:
ComputeSectorMode1Data(sector);
break;
}
}
public CdromImage ReadImage(string filename)
{
byte[] buffer;
FileInfo fileinfo;
try
{
fileinfo = new FileInfo(filename);
if (fileinfo.Length % 2352 != 0)
{
throw new IOException($"File size of {filename} does not match.");
}
}
catch (Exception exception)
{
throw new IOException($"Unable to read file {filename}", exception);
}
try
{
buffer = new byte[fileinfo.Length];
using var stream = new FileStream(filename, FileMode.Open, FileAccess.Read);
using var reader = new BinaryReader(stream);
if (reader.Read(buffer, 0, (int)fileinfo.Length) != fileinfo.Length)
{
throw new IOException($"Unable to read whole {filename} file.");
}
;
}
catch (Exception exception)
{
throw new IOException($"Unable to read file {filename}", exception);
}
var cdrom = new CdromImage();
for (var i = 0; i < buffer.Length / 2352; i++)
{
var sector = new CdromSector
{
PhysicalAddress = i,
Mode = CdromSectorMode.Mode1
};
Buffer.BlockCopy(buffer, i * 2352, sector.Data, 0, 2352);
cdrom.Sectors.Add(sector);
}
return(cdrom);
}
private void FixSectorData(CdromSector sector)
{
for (var i = 1; i < 11; i++)
{
sector.Data[i] = 0xff;
}
var sectorAddress = new CdromSectorAddress((uint)sector.PhysicalAddress);
sector.Data[0x0c] = sectorAddress.Minute;
sector.Data[0x0d] = sectorAddress.Second;
sector.Data[0x0e] = sectorAddress.Frame;
sector.Data[0x0f] = (byte)CdromSectorMode.Mode1;
ErrorCorrectionModel.FixSector(sector);
}
private static void ComputeSectorMode1Data(CdromSector sector)
{
const uint edcOffset = 0x810;
var edc = CalculateEdc(sector.Data, 0, edcOffset);
sector.Data[edcOffset + 0] = (byte)(edc & 0xff);
sector.Data[edcOffset + 1] = (byte)((edc >> 8) & 0xff);
sector.Data[edcOffset + 2] = (byte)((edc >> 16) & 0xff);
sector.Data[edcOffset + 3] = (byte)((edc >> 24) & 0xff);
for (var i = edcOffset + 4; i < edcOffset + 4 + 8; i++)
{
sector.Data[i] = 0;
}
ComputeEcc(sector.Data, 0x0c, 86, 24, 2, 86, 0x81c);
ComputeEcc(sector.Data, 0x0c, 52, 43, 86, 88, 0x8c8);
}
