Function rand_core::impls::fill_via_u64_chunks

pub fn fill_via_u64_chunks(src: &[u64], dest: &mut [u8]) -> (usize, usize)

Implement fill_bytes by reading chunks from the output buffer of a block based RNG.

The return values are (consumed_u64, filled_u8). filled_u8 is the number of filled bytes in dest, which may be less than the length of dest. consumed_u64 is the number of words consumed from src, which is the same as filled_u8 / 8 rounded up.

See fill_via_u32_chunks for an example.