ntex-bytes 1.11.0

Types and traits for working with bytes (bytes crate fork)
Documentation 
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#![deny(warnings, rust_2018_idioms)]
#![allow(clippy::unnecessary_mut_passed)]

use ntex_bytes::{Buf, BufMut, Bytes, BytesMut};

#[test]
fn test_fresh_cursor_vec() {
    let mut buf = &b"hello"[..];

    assert_eq!(buf.remaining(), 5);
    assert_eq!(buf.chunk(), b"hello");

    buf.advance(2);

    assert_eq!(buf.remaining(), 3);
    assert_eq!(buf.chunk(), b"llo");

    buf.advance(3);

    assert_eq!(buf.remaining(), 0);
    assert_eq!(buf.chunk(), b"");
}

#[test]
fn test_bytes() {
    let mut buf = Bytes::from(b"hello");

    assert_eq!(bytes::buf::Buf::remaining(&buf), 5);
    assert_eq!(bytes::buf::Buf::chunk(&buf), b"hello");

    bytes::buf::Buf::advance(&mut buf, 2);

    assert_eq!(bytes::buf::Buf::remaining(&buf), 3);
    assert_eq!(bytes::buf::Buf::chunk(&buf), b"llo");

    bytes::buf::Buf::advance(&mut buf, 3);

    assert_eq!(bytes::buf::Buf::remaining(&buf), 0);
    assert_eq!(bytes::buf::Buf::chunk(&buf), b"");
}

#[test]
fn test_bytes_mut() {
    let mut buf = BytesMut::with_capacity(30);
    buf.extend_from_slice(b"hello");
    assert_eq!(Buf::remaining(&buf), 5);
    assert_eq!(Buf::chunk(&buf), b"hello");

    assert_eq!(BufMut::remaining_mut(&mut buf), 25);
    Buf::advance(&mut buf, 2);

    assert_eq!(Buf::remaining(&buf), 3);
    assert_eq!(Buf::chunk(&buf), b"llo");

    Buf::advance(&mut buf, 3);

    assert_eq!(Buf::remaining(&buf), 0);
    assert_eq!(Buf::chunk(&buf), b"");
}

#[test]
fn test_bytes_mut_buf() {
    let mut buf = BytesMut::with_capacity(30);
    buf.extend_from_slice(b"hello");

    assert_eq!(bytes::buf::Buf::remaining(&buf), 5);
    assert_eq!(bytes::buf::Buf::chunk(&buf), b"hello");

    assert_eq!(bytes::buf::BufMut::remaining_mut(&mut buf), usize::MAX - 5);
    bytes::buf::Buf::advance(&mut buf, 2);

    assert_eq!(bytes::buf::Buf::remaining(&buf), 3);
    assert_eq!(bytes::buf::Buf::chunk(&buf), b"llo");

    bytes::buf::Buf::advance(&mut buf, 3);

    assert_eq!(bytes::buf::Buf::remaining(&buf), 0);
    assert_eq!(bytes::buf::Buf::chunk(&buf), b"");

    bytes::buf::BufMut::put_slice(&mut buf, b"12");
    bytes::buf::BufMut::put_u8(&mut buf, b'3');
    bytes::buf::BufMut::put_i8(&mut buf, b'4' as i8);
    unsafe {
        let c = bytes::buf::BufMut::chunk_mut(&mut buf);
        *c.as_mut_ptr() = b'5';
        assert!(c.as_mut_ptr().as_ref().unwrap() == &b'5');
        bytes::buf::BufMut::advance_mut(&mut buf, 1);
    }
    assert_eq!(&bytes::buf::Buf::chunk(&buf), b"12345");
}

#[test]
fn test_bytes_vec() {
    let mut buf = BytesMut::from(b"hello");
    assert_eq!(Buf::remaining(&buf), 5);
    assert_eq!(Buf::chunk(&buf), b"hello");

    assert_eq!(BufMut::remaining_mut(&mut buf), 0);
    Buf::advance(&mut buf, 2);

    assert_eq!(Buf::remaining(&buf), 3);
    assert_eq!(Buf::chunk(&buf), b"llo");

    Buf::advance(&mut buf, 3);

    assert_eq!(Buf::remaining(&buf), 0);
    assert_eq!(Buf::chunk(&buf), b"");
}

#[test]
fn test_bytes_vec_buf() {
    let mut buf = BytesMut::from(b"hello");

    assert_eq!(bytes::buf::Buf::remaining(&buf), 5);
    assert_eq!(bytes::buf::Buf::chunk(&buf), b"hello");

    assert_eq!(bytes::buf::BufMut::remaining_mut(&mut buf), usize::MAX - 5);
    bytes::buf::Buf::advance(&mut buf, 2);

    assert_eq!(bytes::buf::Buf::remaining(&buf), 3);
    assert_eq!(bytes::buf::Buf::chunk(&buf), b"llo");

    bytes::buf::Buf::advance(&mut buf, 3);

    assert_eq!(bytes::buf::Buf::remaining(&buf), 0);
    assert_eq!(bytes::buf::Buf::chunk(&buf), b"");

    bytes::buf::BufMut::put_slice(&mut buf, b"12");
    bytes::buf::BufMut::put_u8(&mut buf, b'3');
    bytes::buf::BufMut::put_i8(&mut buf, b'4' as i8);
    unsafe {
        let c = bytes::buf::BufMut::chunk_mut(&mut buf);
        *c.as_mut_ptr() = b'5';
        assert!(c.as_mut_ptr().as_ref().unwrap() == &b'5');
        bytes::buf::BufMut::advance_mut(&mut buf, 1);
    }
    assert_eq!(&bytes::buf::Buf::chunk(&buf), b"12345");
}

/// Encoders written for the `bytes` crate, such as prost, check
/// `remaining_mut()` up front and expect a growable buffer.
#[test]
fn test_bytes_mut_buf_grows() {
    fn encode(buf: &mut impl bytes::buf::BufMut, data: &[u8]) -> Result<(), ()> {
        if buf.remaining_mut() < data.len() {
            return Err(());
        }
        buf.put_slice(data);
        Ok(())
    }

    let mut buf = BytesMut::from(b"x");
    encode(&mut buf, &[1; 100]).unwrap();
    assert_eq!(&buf[1..], &[1; 100][..]);

    // a full buffer still hands out room to write into
    let mut buf = BytesMut::from(b"hello");
    assert!(bytes::buf::BufMut::chunk_mut(&mut buf).len() > 0);
    let mut w = bytes::buf::BufMut::writer(buf);
    std::io::Write::write_all(&mut w, b" world").unwrap();
    assert_eq!(w.into_inner(), b"hello world"[..]);

    let mut buf = BytesMut::from(b"a");
    bytes::buf::BufMut::put(&mut buf, &[2u8; 100][..]);
    bytes::buf::BufMut::put(&mut buf, bytes::Buf::chain(&b"bc"[..], &b"de"[..]));
    bytes::buf::BufMut::put_bytes(&mut buf, 3, 50);
    assert_eq!(buf.len(), 1 + 100 + 4 + 50);
    assert_eq!(&buf[..1], b"a");
    assert_eq!(&buf[1..101], &[2; 100][..]);
    assert_eq!(&buf[101..105], b"bcde");
    assert_eq!(&buf[105..], &[3; 50][..]);
}

#[test]
#[should_panic(expected = "cannot advance past `remaining_mut`")]
fn test_bytes_mut_buf_advance_past_capacity() {
    let mut buf = BytesMut::with_capacity(8);
    let cap = buf.capacity();
    unsafe { bytes::buf::BufMut::advance_mut(&mut buf, cap + 1) };
}

#[test]
fn test_get_u8() {
    let mut buf = &b"\x21zomg"[..];
    assert_eq!(0x21, buf.get_u8());
}

#[test]
fn test_get_u16() {
    let mut buf = &b"\x21\x54zomg"[..];
    assert_eq!(0x2154, buf.get_u16());
    let mut buf = &b"\x21\x54zomg"[..];
    assert_eq!(0x5421, buf.get_u16_le());
}

#[test]
fn test_get_int_sign_extends() {
    let mut buf = &b"\xff\xfe\x80\x7f"[..];
    assert_eq!(-2, buf.get_int(2));
    assert_eq!(-128, buf.get_int(1));
    assert_eq!(127, buf.get_int(1));

    let mut buf = &b"\xfe\xff\x00\x80"[..];
    assert_eq!(-2, buf.get_int_le(2));
    assert_eq!(-32768, buf.get_int_le(2));

    assert_eq!(0, (&b""[..]).get_int(0));

    for n in [i64::MIN, -65536, -2, -1, 0, 1, 255, i64::MAX] {
        for nbytes in 1..=8 {
            let shift = (8 - nbytes) * 8;
            let expected = (n << shift) >> shift;

            let mut buf = BytesMut::new();
            buf.put_int(n, nbytes);
            buf.put_int_le(n, nbytes);
            assert_eq!(expected, buf.get_int(nbytes), "{n} {nbytes}");
            assert_eq!(expected, buf.get_int_le(nbytes), "{n} {nbytes}");
        }
    }
}

#[cfg(not(target_os = "macos"))]
#[test]
#[should_panic]
fn test_get_u16_buffer_underflow() {
    let mut buf = &b"\x21"[..];
    buf.get_u16();
}