http-range-header 1.0.0

No-dep range header parser
Documentation 
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use criterion::{criterion_group, criterion_main};
use http_range_header::{RangeInvalid, RangeUnsatisfiableError};
use std::fmt::Write;
use std::hint::black_box;

pub fn bench(c: &mut criterion::Criterion) {
    c.bench_function("Standard range", |b| {
        b.iter(|| {
            http_range_header::parse_range_header(black_box("bytes=0-15"))
                .unwrap()
                .validate(black_box(10_000))
        })
    });
    c.bench_function("Multipart range", |b| {
        b.iter(|| {
            http_range_header::parse_range_header(black_box("bytes=0-15, 20-30, 40-60"))
                .unwrap()
                .validate(black_box(10_000))
        })
    });
    c.bench_function("Suffix range", |b| {
        b.iter(|| {
            http_range_header::parse_range_header(black_box("bytes=-500"))
                .unwrap()
                .validate(black_box(10_000))
        })
    });
    c.bench_function("Open range", |b| {
        b.iter(|| {
            http_range_header::parse_range_header(black_box("bytes=0-"))
                .unwrap()
                .validate(black_box(10_000))
        })
    });
    c.bench_function("Bad multipart range", |b| {
        b.iter(|| {
            assert_eq!(
                Err(RangeUnsatisfiableError::Invalid(
                    RangeInvalid::IllegalWhitespace
                )),
                http_range_header::parse_range_header(black_box("bytes=0-19, -0 "))
            );
        })
    });
    let mut spec = "bytes=".to_string();
    let cases = 200;
    for i in (0..cases).rev().step_by(2) {
        let start = i;
        let end = i + 1;
        spec.write_fmt(format_args!("{}-{},", start, end)).unwrap();
    }
    spec.pop();
    c.bench_function("many ranges parse validate", |b| {
        b.iter(|| {
            let r = http_range_header::parse_range_header(black_box(&spec)).unwrap();
            assert!(r.validate(black_box(cases)).is_ok())
        })
    });
    let r = http_range_header::parse_range_header(black_box(&spec)).unwrap();
    c.bench_function("many ranges validate only", |b| {
        b.iter(|| assert!(r.validate(black_box(cases)).is_ok()))
    });
}
criterion_group!(benches, bench);
criterion_main!(benches);