asbytes 0.3.0

Traits for viewing data as byte slices or consuming data into byte vectors. Relies on bytemuck for POD safety.
Documentation 
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#![cfg(all(feature = "enabled", feature = "into_bytes"))]

use asbytes ::IntoBytes; // Import the specific trait
use core ::mem;

// Define a simple POD struct for testing (can be copied from basic_test.rs)
#[ repr( C ) ]
#[ derive( Clone, Copy, Debug, PartialEq, bytemuck ::Pod, bytemuck ::Zeroable ) ]
struct Point 
{
  x: i32,
  y: i32,
}

#[ test ]
fn test_tuple_scalar_into_bytes() 
{
  let scalar_tuple = (123u32,);
  let expected_bytes = 123u32.to_le_bytes().to_vec();
  let bytes = scalar_tuple.into_bytes();

  assert_eq!(bytes.len(), mem ::size_of :: < u32 >());
  assert_eq!(bytes, expected_bytes);
}

#[ test ]
fn test_tuple_struct_into_bytes() 
{
  let point = Point { x: 10, y: -20 };
  let struct_tuple = (point,);
  let expected_bytes = bytemuck ::bytes_of(&point).to_vec();
  let bytes = struct_tuple.into_bytes();

  assert_eq!(bytes.len(), mem ::size_of :: < Point >());
  assert_eq!(bytes, expected_bytes);
}

#[ test ]
fn test_string_into_bytes() 
{
  let s = String ::from("hello");
  let expected_bytes = vec![b'h', b'e', b'l', b'l', b'o'];
  // Clone s before moving it into into_bytes for assertion
  let bytes = s.clone().into_bytes();

  assert_eq!(bytes.len(), s.len());
  assert_eq!(bytes, expected_bytes);
}

#[ test ]
fn test_str_into_bytes() 
{
  let s = "hello";
  let expected_bytes = vec![b'h', b'e', b'l', b'l', b'o'];
  // Clone s before moving it into into_bytes for assertion
  let bytes = s.into_bytes();

  assert_eq!(bytes.len(), s.len());
  assert_eq!(bytes, expected_bytes);
}

#[ test ]
fn test_array_into_bytes() 
{
  let arr: [u16; 3] = [100, 200, 300];
  let expected_bytes = bytemuck ::cast_slice(&arr).to_vec();
  let bytes = arr.into_bytes(); // arr is Copy

  assert_eq!(bytes.len(), arr.len() * mem ::size_of :: < u16 >());
  assert_eq!(bytes, expected_bytes);
}

#[ test ]
fn test_vec_into_bytes() 
{
  let v = vec![Point { x: 1, y: 2 }, Point { x: 3, y: 4 }];
  let expected_bytes = bytemuck ::cast_slice(v.as_slice()).to_vec();
  let expected_len = v.len() * mem ::size_of :: < Point >();
  // Clone v before moving it into into_bytes for assertion
  let bytes = v.clone().into_bytes();

  assert_eq!(bytes.len(), expected_len);
  assert_eq!(bytes, expected_bytes);
}

#[ test ]
fn test_box_t_into_bytes() 
{
  let b = Box ::new(Point { x: 5, y: 5 });
  let expected_bytes = bytemuck ::bytes_of(&*b).to_vec();
  let expected_len = mem ::size_of :: < Point >();
  let bytes = b.into_bytes();

  assert_eq!(bytes.len(), expected_len);
  assert_eq!(bytes, expected_bytes);
}

#[ test ]
fn test_slice_into_bytes() 
{
  let slice: &[ u32] = &[ 10, 20, 30][..];
  let expected_bytes = bytemuck ::cast_slice(slice).to_vec();
  let expected_len = core ::mem ::size_of_val(slice);
  let bytes = slice.into_bytes();

  assert_eq!(bytes.len(), expected_len);
  assert_eq!(bytes, expected_bytes);
}

#[ test ]
fn test_box_slice_into_bytes() 
{
  let slice: Box< [u32] > = vec![10, 20, 30].into_boxed_slice();
  let expected_bytes = bytemuck ::cast_slice(&slice).to_vec();
  let expected_len = slice.len() * mem ::size_of :: < u32 >();
  let bytes = slice.into_bytes();

  assert_eq!(bytes.len(), expected_len);
  assert_eq!(bytes, expected_bytes);
}

#[ test ]
fn test_vecdeque_into_bytes() 
{
  use std ::collections ::VecDeque; // Keep local use for VecDeque
  let mut deque: VecDeque< u16 > = VecDeque ::new();
  deque.push_back(10);
  deque.push_back(20);
  deque.push_front(5); // deque is now [5, 10, 20]

  // Expected bytes for [5, 10, 20] (little-endian)
  let expected_bytes = vec![
  5u16.to_le_bytes()[0],
  5u16.to_le_bytes()[1],
  10u16.to_le_bytes()[0],
  10u16.to_le_bytes()[1],
  20u16.to_le_bytes()[0],
  20u16.to_le_bytes()[1],
 ];
  let expected_len = deque.len() * mem ::size_of :: < u16 >();
  let bytes = deque.into_bytes();

  assert_eq!(bytes.len(), expected_len);
  assert_eq!(bytes, expected_bytes);
}

#[ test ]
fn test_cstring_into_bytes() 
{
  use std ::ffi ::CString; // Keep local use for CString
  let cs = CString ::new("world").unwrap();
  let expected_bytes = vec![b'w', b'o', b'r', b'l', b'd']; // No NUL byte
  let expected_len = expected_bytes.len();
  let bytes = cs.into_bytes();

  assert_eq!(bytes.len(), expected_len);
  assert_eq!(bytes, expected_bytes);
}