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.
use core::fmt::{Debug, Formatter, Result};

use super::BytesRef;
use crate::{Bytes, BytesMut};

/// Alternative implementation of `std::fmt::Debug` for byte slice.
///
/// Standard `Debug` implementation for `[u8]` is comma separated
/// list of numbers. Since large amount of byte strings are in fact
/// ASCII strings or contain a lot of ASCII strings (e. g. HTTP),
/// it is convenient to print strings as ASCII when possible.
impl Debug for BytesRef<'_> {
    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
        write!(f, "b\"")?;
        for &b in self.0 {
            // https://doc.rust-lang.org/reference/tokens.html#byte-escapes
            if b == b'\n' {
                write!(f, "\\n")?;
            } else if b == b'\r' {
                write!(f, "\\r")?;
            } else if b == b'\t' {
                write!(f, "\\t")?;
            } else if b == b'\\' || b == b'"' {
                write!(f, "\\{}", b as char)?;
            } else if b == b'\0' {
                write!(f, "\\0")?;
            // ASCII printable
            } else if (0x20..0x7f).contains(&b) {
                write!(f, "{}", b as char)?;
            } else {
                write!(f, "\\x{:02x}", b)?;
            }
        }
        write!(f, "\"")?;
        Ok(())
    }
}

impl Debug for Bytes {
    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
        Debug::fmt(&BytesRef(self.as_ref()), f)
    }
}

impl Debug for BytesMut {
    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
        Debug::fmt(&BytesRef(self.as_ref()), f)
    }
}