rcbytes 1.2.2

Rc version bytes crate
Documentation 
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// The code in this file is heavily based on [Carl Lerche's LRU implementation](https://github.com/tokio-rs/bytes).
//
// MIT License
//
// Copyright (c) 2022 Al Liu (https://github.com/al8n/rcbytes)
//
// Copyright (c) 2018 Carl Lerche (https://github.com/tokio-rs/bytes)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#![feature(test)]
#![warn(rust_2018_idioms)]

extern crate test;

use rcbytes::Bytes;
use test::Bencher;

#[bench]
fn deref_unique(b: &mut Bencher) {
    let buf = Bytes::from(vec![0; 1024]);

    b.iter(|| {
        for _ in 0..1024 {
            test::black_box(&buf[..]);
        }
    })
}

#[bench]
fn deref_shared(b: &mut Bencher) {
    let buf = Bytes::from(vec![0; 1024]);
    let _b2 = buf.clone();

    b.iter(|| {
        for _ in 0..1024 {
            test::black_box(&buf[..]);
        }
    })
}

#[bench]
fn deref_static(b: &mut Bencher) {
    let buf = Bytes::from_static(b"hello world");

    b.iter(|| {
        for _ in 0..1024 {
            test::black_box(&buf[..]);
        }
    })
}

#[bench]
fn clone_static(b: &mut Bencher) {
    let bytes =
        Bytes::from_static("hello world 1234567890 and have a good byte 0987654321".as_bytes());

    b.iter(|| {
        for _ in 0..1024 {
            test::black_box(&bytes.clone());
        }
    })
}

#[bench]
fn clone_shared(b: &mut Bencher) {
    let bytes = Bytes::from(b"hello world 1234567890 and have a good byte 0987654321".to_vec());

    b.iter(|| {
        for _ in 0..1024 {
            test::black_box(&bytes.clone());
        }
    })
}

#[bench]
fn clone_arc_vec(b: &mut Bencher) {
    use std::sync::Arc;
    let bytes = Arc::new(b"hello world 1234567890 and have a good byte 0987654321".to_vec());

    b.iter(|| {
        for _ in 0..1024 {
            test::black_box(&bytes.clone());
        }
    })
}

#[bench]
fn from_long_slice(b: &mut Bencher) {
    let data = [0u8; 128];
    b.bytes = data.len() as u64;
    b.iter(|| {
        let buf = Bytes::copy_from_slice(&data[..]);
        test::black_box(buf);
    })
}

#[bench]
fn slice_empty(b: &mut Bencher) {
    b.iter(|| {
        // `clone` is to convert to ARC
        let b = Bytes::from(vec![17; 1024]).clone();
        for i in 0..1000 {
            test::black_box(b.slice(i % 100..i % 100));
        }
    })
}

#[bench]
fn slice_short_from_arc(b: &mut Bencher) {
    b.iter(|| {
        // `clone` is to convert to ARC
        let b = Bytes::from(vec![17; 1024]).clone();
        for i in 0..1000 {
            test::black_box(b.slice(1..2 + i % 10));
        }
    })
}

#[bench]
fn split_off_and_drop(b: &mut Bencher) {
    b.iter(|| {
        for _ in 0..1024 {
            let v = vec![10; 200];
            let mut b = Bytes::from(v);
            test::black_box(b.split_off(100));
            test::black_box(b);
        }
    })
}