Comment by szanni

This looks like a nice and concise library. Single header file, many useful functions, and a usable license. The only thing I really dislike are all of the typedefs.

  zpl_u64 zpl_crc64(void const *data, zpl_isize len);

Const correctness, good! But why is the size parameter signed? Why not use size_t and uint64_t like the C stdlib?