#![warn(rust_2018_idioms)]
use bytes::buf::UninitSlice;
use bytes::{BufMut, BytesMut};
use core::fmt::Write;
use core::mem::MaybeUninit;
use core::usize;
#[test]
fn test_vec_as_mut_buf() {
let mut buf = Vec::with_capacity(64);
assert_eq!(buf.remaining_mut(), isize::MAX as usize);
assert!(buf.chunk_mut().len() >= 64);
buf.put(&b"zomg"[..]);
assert_eq!(&buf, b"zomg");
assert_eq!(buf.remaining_mut(), isize::MAX as usize - 4);
assert_eq!(buf.capacity(), 64);
for _ in 0..16 {
buf.put(&b"zomg"[..]);
}
assert_eq!(buf.len(), 68);
}
#[test]
fn test_vec_put_bytes() {
let mut buf = Vec::new();
buf.push(17);
buf.put_bytes(19, 2);
assert_eq!([17, 19, 19], &buf[..]);
}
#[test]
fn test_put_u8() {
let mut buf = Vec::with_capacity(8);
buf.put_u8(33);
assert_eq!(b"\x21", &buf[..]);
}
#[test]
fn test_put_u16() {
let mut buf = Vec::with_capacity(8);
buf.put_u16(8532);
assert_eq!(b"\x21\x54", &buf[..]);
buf.clear();
buf.put_u16_le(8532);
assert_eq!(b"\x54\x21", &buf[..]);
}
#[test]
fn test_put_int() {
let mut buf = Vec::with_capacity(8);
buf.put_int(0x1020304050607080, 3);
assert_eq!(b"\x60\x70\x80", &buf[..]);
}
#[test]
#[should_panic]
fn test_put_int_nbytes_overflow() {
let mut buf = Vec::with_capacity(8);
buf.put_int(0x1020304050607080, 9);
}
#[test]
fn test_put_int_le() {
let mut buf = Vec::with_capacity(8);
buf.put_int_le(0x1020304050607080, 3);
assert_eq!(b"\x80\x70\x60", &buf[..]);
}
#[test]
#[should_panic]
fn test_put_int_le_nbytes_overflow() {
let mut buf = Vec::with_capacity(8);
buf.put_int_le(0x1020304050607080, 9);
}
#[test]
#[should_panic(expected = "advance out of bounds: the len is 8 but advancing by 12")]
fn test_vec_advance_mut() {
// Verify fix for #354
let mut buf = Vec::with_capacity(8);
unsafe {
buf.advance_mut(12);
}
}
#[test]
fn test_clone() {
let mut buf = BytesMut::with_capacity(100);
buf.write_str("this is a test").unwrap();
let buf2 = buf.clone();
buf.write_str(" of our emergency broadcast system").unwrap();
assert!(buf != buf2);
}
fn do_test_slice_small<T: ?Sized>(make: impl Fn(&mut [u8]) -> &mut T)
where
for<'r> &'r mut T: BufMut,
{
let mut buf = [b'X'; 8];
let mut slice = make(&mut buf[..]);
slice.put_bytes(b'A', 2);
slice.put_u8(b'B');
slice.put_slice(b"BCC");
assert_eq!(2, slice.remaining_mut());
assert_eq!(b"AABBCCXX", &buf[..]);
let mut slice = make(&mut buf[..]);
slice.put_u32(0x61626364);
assert_eq!(4, slice.remaining_mut());
assert_eq!(b"abcdCCXX", &buf[..]);
let mut slice = make(&mut buf[..]);
slice.put_u32_le(0x30313233);
assert_eq!(4, slice.remaining_mut());
assert_eq!(b"3210CCXX", &buf[..]);
}
fn do_test_slice_large<T: ?Sized>(make: impl Fn(&mut [u8]) -> &mut T)
where
for<'r> &'r mut T: BufMut,
{
const LEN: usize = 100;
const FILL: [u8; LEN] = [b'Y'; LEN];
let test = |fill: &dyn Fn(&mut &mut T, usize)| {
for buf_len in 0..LEN {
let mut buf = [b'X'; LEN];
for fill_len in 0..=buf_len {
let mut slice = make(&mut buf[..buf_len]);
fill(&mut slice, fill_len);
assert_eq!(buf_len - fill_len, slice.remaining_mut());
let (head, tail) = buf.split_at(fill_len);
assert_eq!(&FILL[..fill_len], head);
assert!(tail.iter().all(|b| *b == b'X'));
}
}
};
test(&|slice, fill_len| slice.put_slice(&FILL[..fill_len]));
test(&|slice, fill_len| slice.put_bytes(FILL[0], fill_len));
}
fn do_test_slice_put_slice_panics<T: ?Sized>(make: impl Fn(&mut [u8]) -> &mut T)
where
for<'r> &'r mut T: BufMut,
{
let mut buf = [b'X'; 4];
let mut slice = make(&mut buf[..]);
slice.put_slice(b"12345");
}
fn do_test_slice_put_bytes_panics<T: ?Sized>(make: impl Fn(&mut [u8]) -> &mut T)
where
for<'r> &'r mut T: BufMut,
{
let mut buf = [b'X'; 4];
let mut slice = make(&mut buf[..]);
slice.put_bytes(b'1', 5);
}
#[test]
fn test_slice_buf_mut_small() {
do_test_slice_small(|x| x);
}
#[test]
fn test_slice_buf_mut_large() {
do_test_slice_large(|x| x);
}
#[test]
#[should_panic]
fn test_slice_buf_mut_put_slice_overflow() {
do_test_slice_put_slice_panics(|x| x);
}
#[test]
#[should_panic]
fn test_slice_buf_mut_put_bytes_overflow() {
do_test_slice_put_bytes_panics(|x| x);
}
fn make_maybe_uninit_slice(slice: &mut [u8]) -> &mut [MaybeUninit<u8>] {
// SAFETY: [u8] has the same layout as [MaybeUninit<u8>].
unsafe { core::mem::transmute(slice) }
}
#[test]
fn test_maybe_uninit_buf_mut_small() {
do_test_slice_small(make_maybe_uninit_slice);
}
#[test]
fn test_maybe_uninit_buf_mut_large() {
do_test_slice_large(make_maybe_uninit_slice);
}
#[test]
#[should_panic]
fn test_maybe_uninit_buf_mut_put_slice_overflow() {
do_test_slice_put_slice_panics(make_maybe_uninit_slice);
}
#[test]
#[should_panic]
fn test_maybe_uninit_buf_mut_put_bytes_overflow() {
do_test_slice_put_bytes_panics(make_maybe_uninit_slice);
}
#[allow(unused_allocation)] // This is intentional.
#[test]
fn test_deref_bufmut_forwards() {
struct Special;
unsafe impl BufMut for Special {
fn remaining_mut(&self) -> usize {
unreachable!("remaining_mut");
}
fn chunk_mut(&mut self) -> &mut UninitSlice {
unreachable!("chunk_mut");
}
unsafe fn advance_mut(&mut self, _: usize) {
unreachable!("advance");
}
fn put_u8(&mut self, _: u8) {
// specialized!
}
}
// these should all use the specialized method
Special.put_u8(b'x');
(&mut Special as &mut dyn BufMut).put_u8(b'x');
(Box::new(Special) as Box<dyn BufMut>).put_u8(b'x');
Box::new(Special).put_u8(b'x');
}
#[test]
#[should_panic]
fn write_byte_panics_if_out_of_bounds() {
let mut data = [b'b', b'a', b'r'];
let slice = unsafe { UninitSlice::from_raw_parts_mut(data.as_mut_ptr(), 3) };
slice.write_byte(4, b'f');
}
#[test]
#[should_panic]
fn copy_from_slice_panics_if_different_length_1() {
let mut data = [b'b', b'a', b'r'];
let slice = unsafe { UninitSlice::from_raw_parts_mut(data.as_mut_ptr(), 3) };
slice.copy_from_slice(b"a");
}
#[test]
#[should_panic]
fn copy_from_slice_panics_if_different_length_2() {
let mut data = [b'b', b'a', b'r'];
let slice = unsafe { UninitSlice::from_raw_parts_mut(data.as_mut_ptr(), 3) };
slice.copy_from_slice(b"abcd");
}
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