private static byte[] GenerateJunk(uint i, gcm_info g_i)
{
uint seed = 0;
uint blockcount = i * 8 * 0x1ef29123;
byte[] JunkSector = new byte[0x40000];
using (BinaryWriter mw = new BinaryWriter(new MemoryStream(JunkSector)))
{
while (mw.BaseStream.Position != mw.BaseStream.Length)
{
if ((mw.BaseStream.Position & 0x00007fff) == 0)
{
seed = (((((uint)g_i.id[2] << 8) | g_i.id[1]) << 16) | ((uint)(g_i.id[3] + g_i.id[2]) << 8)) | (uint)(g_i.id[0] + g_i.id[1]);
seed = ((seed ^ g_i.disc_number) * 0x260bcd5) ^ blockcount;
init_rnd(seed);
blockcount += 0x1ef29123;
}
byte[] result = scramble(irnd());
mw.Write(result);
}
}
return(JunkSector);
}
private static gcm_info GetGcmInfo(string arg)
{
gcm_info temp = new gcm_info();
using (BinaryReader br = new BinaryReader(new FileStream(arg, FileMode.Open)))
{
temp.id = br.ReadBytes(6);
temp.disc_number = br.ReadByte();
}
return(temp);
}
static void Main(string[] args)
{
foreach (string arg in args)
{
if (CheckGCM(arg))
{
type.dec = 0;
type.enc = 0;
gcm_info g_i = GetGcmInfo(arg);
using (BinaryReader br = new BinaryReader(new FileStream(arg, FileMode.Open)))
{
using (BinaryWriter bw = new BinaryWriter(new FileStream("temp_gcm", FileMode.Create)))
{
uint sector_number = 0;
while (br.BaseStream.Position != br.BaseStream.Length)
{
int read_length = ((int)(br.BaseStream.Length - br.BaseStream.Position) >= 0x40000) ? 0x40000 : (int)(br.BaseStream.Length - br.BaseStream.Position);
byte[] array1 = br.ReadBytes(read_length);
byte[] array2 = GenerateJunk(sector_number++, g_i);
switch (CompareArrays(array1, array2))
{
case 0:
bw.Write(array1);
break;
case 1:
bw.Write(junk);
break;
case 2:
bw.Write(array2);
break;
}
Console.Write(string.Format("\r{0}%", (Math.Round((((double)sector_number / 5570.0) * 100), 0).ToString())));
}
}
}
string arg_new = CreateName(arg);
File.Move("temp_gcm", arg_new);
}
}
}
