How to rotate byte [] in sbyte * in C #?

Question

I have a function that wants to receive sbyte * buffer, how to create such in C # from scratch and from an existing byte []?

Answer 1

// Allocate a new buffer (skip this if you already have one)
byte[] buffer = new byte[256];
unsafe
{
    // The "fixed" statement tells the runtime to keep the array in the same
    // place in memory (relocating it would make the pointer invalid)
    fixed (byte* ptr_byte = &buffer[0])
    {
        // Cast the pointer to sbyte*
        sbyte* ptr_sbyte = (sbyte*) ptr_byte;

        // Do your stuff here
    }

    // The end of the "fixed" block tells the runtime that the original array
    // is available for relocation and/or garbage collection again
}

Answer 2

Casting to an array and casting it into bytes [] will suffice.

byte [] unsigned = {0, 1, 2};

sbyte [] signed = (sbyte []) (array) unsigned;