smol-bytes 0.1.7

High-performance, clone-efficient byte buffers optimized for small data.
Documentation 
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#![warn(rust_2018_idioms)]

use smol_bytes::{Buf, Bytes};

#[test]
fn long_take() {
  // Tests that get a take with a size greater than the buffer length will not
  // overrun the buffer. Regression test for #138.
  let buf = Bytes::from(b"hello world").take(100);
  assert_eq!(11, buf.remaining());
  assert_eq!(b"hello world", buf.chunk());
}

#[test]
fn take_copy_to_bytes() {
  let mut abcd = Bytes::copy_from_slice(b"abcd");
  let mut take = (&mut abcd).take(2);
  let a = take.copy_to_bytes(1);
  assert_eq!(Bytes::copy_from_slice(b"a"), a);
  assert_eq!(Bytes::copy_from_slice(b"bcd"), abcd);
}

#[test]
#[should_panic]
fn take_copy_to_bytes_panics() {
  let abcd = Bytes::copy_from_slice(b"abcd");
  abcd.take(2).copy_to_bytes(3);
}

#[cfg(feature = "std")]
#[test]
fn take_chunks_vectored() {
  fn chain() -> impl Buf {
    Bytes::from([1, 2, 3].to_vec()).chain(Bytes::from([4, 5, 6].to_vec()))
  }

  {
    let mut dst = [std::io::IoSlice::new(&[]); 2];
    let take = chain().take(0);
    assert_eq!(take.chunks_vectored(&mut dst), 0);
  }

  {
    let mut dst = [std::io::IoSlice::new(&[]); 2];
    let take = chain().take(1);
    assert_eq!(take.chunks_vectored(&mut dst), 1);
    assert_eq!(&*dst[0], &[1]);
  }

  {
    let mut dst = [std::io::IoSlice::new(&[]); 2];
    let take = chain().take(3);
    assert_eq!(take.chunks_vectored(&mut dst), 1);
    assert_eq!(&*dst[0], &[1, 2, 3]);
  }

  {
    let mut dst = [std::io::IoSlice::new(&[]); 2];
    let take = chain().take(4);
    assert_eq!(take.chunks_vectored(&mut dst), 2);
    assert_eq!(&*dst[0], &[1, 2, 3]);
    assert_eq!(&*dst[1], &[4]);
  }

  {
    let mut dst = [std::io::IoSlice::new(&[]); 2];
    let take = chain().take(6);
    assert_eq!(take.chunks_vectored(&mut dst), 2);
    assert_eq!(&*dst[0], &[1, 2, 3]);
    assert_eq!(&*dst[1], &[4, 5, 6]);
  }

  {
    let mut dst = [std::io::IoSlice::new(&[]); 2];
    let take = chain().take(7);
    assert_eq!(take.chunks_vectored(&mut dst), 2);
    assert_eq!(&*dst[0], &[1, 2, 3]);
    assert_eq!(&*dst[1], &[4, 5, 6]);
  }
}