I can't see anything obviously wrong with a quick scan of your code. You may want to consider moving to unsigned char buf if you're expecting to work with 8 bit values.
I finally worked it out. This is what fixed it.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.