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use std::io::{Read, Result, Write};
pub trait ReadExactExt: Read {
/// Read a byte array of a constant size.
///
/// For further semantics please refer to [`Read::read_exact`].
///
/// # Examples
/// ```
/// use rw_exact_ext::ReadExactExt;
/// use std::io::Cursor;
///
/// let bytes = [0xAB, 0xCD, 0xEF, 0x42];
/// let array: [u8; 4] = Cursor::new(&bytes).read_array_exact().unwrap();
/// assert_eq!(array, bytes);
/// ```
#[allow(clippy::missing_errors_doc)]
fn read_array_exact<const SIZE: usize>(&mut self) -> Result<[u8; SIZE]> {
let mut buffer = [0; SIZE];
self.read_exact(&mut buffer)?;
Ok(buffer)
}
/// Read a `Vec<u8>` of a given size.
///
/// For further semantics please refer to [`Read::read_exact`].
///
/// # Examples
/// ```
/// use rw_exact_ext::ReadExactExt;
/// use std::io::Cursor;
///
/// let bytes = [0xAB, 0xCD, 0xEF, 0x42];
/// let vec = Cursor::new(&bytes).read_vec_exact(bytes.len()).unwrap();
/// assert_eq!(vec, Vec::from(bytes));
/// ```
#[allow(clippy::missing_errors_doc)]
fn read_vec_exact(&mut self, size: usize) -> Result<Vec<u8>> {
let mut buffer = vec![0; size];
self.read_exact(&mut buffer)?;
Ok(buffer)
}
/// Read a number from a byte array in big endian.
///
/// For further semantics please refer to [`Read::read_exact`].
///
/// # Examples
/// ```
/// use rw_exact_ext::ReadExactExt;
/// use std::io::Cursor;
///
/// let bytes = [0xAB, 0xCD, 0xEF, 0x42];
///
/// let unsigned: u32 = Cursor::new(&bytes).read_num_be().unwrap();
/// assert_eq!(unsigned, 0xABCDEF42);
///
/// let signed: i32 = Cursor::new(&bytes).read_num_be().unwrap();
/// assert_eq!(signed, -0x543210BE);
///
/// let float: f32 = Cursor::new(&bytes).read_num_be().unwrap();
/// assert_eq!(float, -1.4632533e-12);
/// ```
#[cfg(feature = "num-traits")]
#[allow(clippy::missing_errors_doc)]
fn read_num_be<N, const SIZE: usize>(&mut self) -> Result<N>
where
N: num_traits::FromBytes<Bytes = [u8; SIZE]>,
{
self.read_array_exact()
.map(|bytes| N::from_be_bytes(&bytes))
}
/// Read a number from a byte array in little endian.
///
/// For further semantics please refer to [`Read::read_exact`].
///
/// # Examples
/// ```
/// use rw_exact_ext::ReadExactExt;
/// use std::io::Cursor;
///
/// let bytes = [0xAB, 0xCD, 0xEF, 0x42];
///
/// let unsigned: u32 = Cursor::new(&bytes).read_num_le().unwrap();
/// assert_eq!(unsigned, 0x42EFCDAB);
///
/// let signed: i32 = Cursor::new(&bytes).read_num_le().unwrap();
/// assert_eq!(signed, 0x42EFCDAB);
///
/// let float: f32 = Cursor::new(&bytes).read_num_le().unwrap();
/// assert_eq!(float, 119.901695);
/// ```
#[cfg(feature = "num-traits")]
#[allow(clippy::missing_errors_doc)]
fn read_num_le<N, const SIZE: usize>(&mut self) -> Result<N>
where
N: num_traits::FromBytes<Bytes = [u8; SIZE]>,
{
self.read_array_exact()
.map(|bytes| N::from_le_bytes(&bytes))
}
/// Read a number from a byte array in native endianness.
///
/// For further semantics please refer to [`Read::read_exact`].
#[cfg(feature = "num-traits")]
#[allow(clippy::missing_errors_doc)]
fn read_num_ne<N, const SIZE: usize>(&mut self) -> Result<N>
where
N: num_traits::FromBytes<Bytes = [u8; SIZE]>,
{
self.read_array_exact()
.map(|bytes| N::from_ne_bytes(&bytes))
}
}
impl<T> ReadExactExt for T where T: Read {}
pub trait WriteAllExt: Write {
/// Write a number to bytes in big endian.
///
/// For further semantics please refer to [`Write::write_all`].
///
/// # Examples
/// ```
/// use rw_exact_ext::WriteAllExt;
/// use std::io::Cursor;
///
/// let mut bytes = vec![0u8; 4];
///
/// let unsigned: u32 = 1337;
/// Cursor::new(&mut bytes).write_num_be(unsigned).unwrap();
/// assert_eq!(bytes, vec![0x00, 0x00, 0x05, 0x39]);
///
/// let signed: i32 = -1337;
/// Cursor::new(&mut bytes).write_num_be(signed).unwrap();
/// assert_eq!(bytes, vec![0xFF, 0xFF, 0xFA, 0xC7]);
///
/// let float: f32 = 133.7;
/// Cursor::new(&mut bytes).write_num_be(float).unwrap();
/// assert_eq!(bytes, vec![0x43, 0x05, 0xB3, 0x33]);
/// ```
#[cfg(feature = "num-traits")]
#[allow(clippy::missing_errors_doc)]
fn write_num_be<N, const SIZE: usize>(&mut self, num: N) -> Result<()>
where
N: num_traits::ToBytes<Bytes = [u8; SIZE]>,
{
self.write_all(&num.to_be_bytes())
}
/// Write a number to bytes in little endian.
///
/// For further semantics please refer to [`Write::write_all`].
///
/// # Examples
/// ```
/// use rw_exact_ext::WriteAllExt;
/// use std::io::Cursor;
///
/// let mut bytes = vec![0u8; 4];
///
/// let unsigned: u32 = 1337;
/// Cursor::new(&mut bytes).write_num_le(unsigned).unwrap();
/// assert_eq!(bytes, vec![0x39, 0x05, 0x00, 0x00]);
///
/// let signed: i32 = -1337;
/// Cursor::new(&mut bytes).write_num_le(signed).unwrap();
/// assert_eq!(bytes, vec![0xC7, 0xFA, 0xFF, 0xFF]);
///
/// let float: f32 = 133.7;
/// Cursor::new(&mut bytes).write_num_le(float).unwrap();
/// assert_eq!(bytes, vec![0x33, 0xB3, 0x05, 0x43]);
/// ```
#[cfg(feature = "num-traits")]
#[allow(clippy::missing_errors_doc)]
fn write_num_le<N, const SIZE: usize>(&mut self, num: N) -> Result<()>
where
N: num_traits::ToBytes<Bytes = [u8; SIZE]>,
{
self.write_all(&num.to_le_bytes())
}
/// Write a number to bytes in native endianness.
///
/// For further semantics please refer to [`Write::write_all`].
#[cfg(feature = "num-traits")]
#[allow(clippy::missing_errors_doc)]
fn write_num_ne<N, const SIZE: usize>(&mut self, num: N) -> Result<()>
where
N: num_traits::ToBytes<Bytes = [u8; SIZE]>,
{
self.write_all(&num.to_ne_bytes())
}
}
impl<T> WriteAllExt for T where T: Write {}