Function histogram

src/histogram.rs:1–7

(bytes: &[u8])

pub fn histogram(bytes: &[u8]) -> [usize; 256] {
    if bytes.len() < 100 {
        histogram_simple(bytes)
    } else {
        histogram_parallel(bytes)
    }
}

fn histogram_simple(bytes: &[u8]) -> [usize; 256] {
    let mut histogram = [0; 256];