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I need to remove every fourth byte in the byte[] I have.
Is there some built-in function that could help me to do that or do I have to loop over the array picking and moving each byte one by one?
Similarly what what if I need to place 0 after every three bytes from byte[] is there a way to do this faster than manually?
Coding it by hand is likely to be very fast, and the bottleneck is the cpu-to-memory bandwidth.
One core can easily max out the memory bandwidth on a modern machine, so multithreading is unlikely to help since the work done is very straightforward (a single read or write per 4th element.)