private void FixSectorOffsets(FileStream iso, string godPath)
{
int sector, size, offset;
byte[] buffer;
Queue <DirEntry> directories = new Queue <DirEntry>();
buffer = File.ReadAllBytes(godPath);
// offset type?
if ((buffer[0x391] & 0x40) != 0x40)
{
return;
}
// calculate the offset
offset = BitConverter.ToInt32(buffer, 0x395);
if (offset == 0)
{
return;
}
offset *= 2;
offset -= 34;
buffer = new byte[4];
iso.Position = 0x10014;
iso.Read(buffer, 0, 4);
sector = BitConverter.ToInt32(buffer, 0);
if (sector > 0)
{
sector -= offset;
byte[] corrected = BitConverter.GetBytes(sector);
iso.Position -= 4;
iso.Write(corrected, 0, 4);
iso.Read(buffer, 0, 4);
size = BitConverter.ToInt32(buffer, 0);
directories.Enqueue(new DirEntry(sector, size));
}
while (directories.Count > 0)
{
DirEntry dirEntry = directories.Dequeue();
iso.Position = dirEntry.StartPos();
while ((iso.Position + 4) < dirEntry.EndPos())
{
// crossed a sector boundary?
if ((iso.Position + 4) / 2048L > iso.Position / 2048L)
{
iso.Position += 2048L - (iso.Position % 2048L);
}
// read subtrees
iso.Read(buffer, 0, 4);
if (buffer[0] == 0xff && buffer[1] == 0xff && buffer[2] == 0xff && buffer[3] == 0xff)
{
// another sector to process?
if (dirEntry.EndPos() - iso.Position > 2048)
{
iso.Position += 2048L - (iso.Position % 2048L);
continue;
}
break;
}
// read sector
iso.Read(buffer, 0, 4);
sector = BitConverter.ToInt32(buffer, 0);
if (sector > 0)
{
sector -= offset;
byte[] corrected = BitConverter.GetBytes(sector);
iso.Position -= 4;
iso.Write(corrected, 0, 4);
}
// get size
iso.Read(buffer, 0, 4);
size = BitConverter.ToInt32(buffer, 0);
// get attributes
iso.Read(buffer, 0, 1);
// if directory add to list of tables to process
if ((buffer[0] & 0x10) == 0x10)
{
directories.Enqueue(new DirEntry(sector, size));
}
// get filename length
iso.Read(buffer, 0, 1);
// skip it
iso.Position += buffer[0];
// skip padding
if ((14 + buffer[0]) % 4 > 0)
{
iso.Position += 4 - ((14 + buffer[0]) % 4);
}
}
}
}