public static unsafe void GetHeader(ref byte[] data, ref MapleIV iv, int length, ushort majorVer)
{
fixed(byte *pData = data)
{
*(ushort *)pData = (ushort)(-(majorVer + 1) ^ iv.HIWORD);
*((ushort *)pData + 1) = (ushort)(*(ushort *)pData ^ length);
}
}
public static void Transform(ref Span <byte> buffer, ref MapleIV iv)
{
int remaining = buffer.Length;
int length = 0x5B0;
int start = 0;
int index;
byte[] realIV = new byte[16];
byte[] IVBytes = BitConverter.GetBytes(iv.Value);
while (remaining > 0)
{
for (index = 0; index < realIV.Length; ++index)
{
realIV[index] = IVBytes[index % 4];
}
if (remaining < length)
{
length = remaining;
}
for (index = start; index < (start + length); ++index)
{
int sub = index - start;
if ((sub % realIV.Length) == 0)
{
sTransformer.TransformBlock(realIV);
}
buffer[index] ^= realIV[sub % realIV.Length];
}
start += length;
remaining -= length;
length = 0x5B4;
}
iv.Shuffle();
}
