Stream DecryptDat(ArcFile arc, Entry entry)
{
byte[] input = arc.File.View.ReadBytes(entry.Offset, entry.Size);
int text_offset = 3600;
int text_length = (int)(entry.Size - text_offset - 2);
m_rng.SRand((sbyte)input[input.Length - 1]);
for (int i = 0; i < text_length; i += 2)
{
input[text_offset + i] ^= (byte)Key[m_rng.Rand() % Key.Length];
}
return(new MemoryStream(input));
}
byte[] DecryptIndex(ArcView idx)
{
int idx_size = (int)idx.MaxOffset - 4;
byte[] output = new byte[idx_size];
using (var view = idx.CreateViewAccessor(0, (uint)idx.MaxOffset))
unsafe
{
var rng = new CRuntimeRandomGenerator();
rng.SRand(view.ReadInt32(idx_size));
byte *ptr = view.GetPointer(0);
try
{
for (int i = 0; i < idx_size; ++i)
{
output[i] = (byte)(ptr[i] ^ IndexKey[rng.Rand() % IndexKey.Length]);
}
return(output);
}
finally
{
view.SafeMemoryMappedViewHandle.ReleasePointer();
}
}
}