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use std::io::{self, Result};
use ByteOrder;
/// Extends `Read` with methods for reading numbers. (For `std::io`.)
///
/// Most of the methods defined here have an unconstrained type parameter that
/// must be explicitly instantiated. Typically, it is instantiated with either
/// the `BigEndian` or `LittleEndian` types defined in this crate.
///
/// # Examples
///
/// Read unsigned 16 bit big-endian integers from a `Read`:
///
/// ```rust
/// use std::io::Cursor;
/// use byteorder::{BigEndian, ReadBytesExt};
///
/// let mut rdr = Cursor::new(vec![2, 5, 3, 0]);
/// assert_eq!(517, rdr.read_u16::<BigEndian>().unwrap());
/// assert_eq!(768, rdr.read_u16::<BigEndian>().unwrap());
/// ```
pub trait ReadBytesExt: io::Read {
/// Reads an unsigned 8 bit integer from the underlying reader.
///
/// Note that since this reads a single byte, no byte order conversions
/// are used. It is included for completeness.
#[inline]
fn read_u8(&mut self) -> Result<u8> {
let mut buf = [0; 1];
try!(self.read_exact(&mut buf));
Ok(buf[0])
}
/// Reads a signed 8 bit integer from the underlying reader.
///
/// Note that since this reads a single byte, no byte order conversions
/// are used. It is included for completeness.
#[inline]
fn read_i8(&mut self) -> Result<i8> {
let mut buf = [0; 1];
try!(self.read_exact(&mut buf));
Ok(buf[0] as i8)
}
/// Reads an unsigned 16 bit integer from the underlying reader.
#[inline]
fn read_u16<T: ByteOrder>(&mut self) -> Result<u16> {
let mut buf = [0; 2];
try!(self.read_exact(&mut buf));
Ok(T::read_u16(&buf))
}
/// Reads a signed 16 bit integer from the underlying reader.
#[inline]
fn read_i16<T: ByteOrder>(&mut self) -> Result<i16> {
let mut buf = [0; 2];
try!(self.read_exact(&mut buf));
Ok(T::read_i16(&buf))
}
/// Reads an unsigned 32 bit integer from the underlying reader.
#[inline]
fn read_u32<T: ByteOrder>(&mut self) -> Result<u32> {
let mut buf = [0; 4];
try!(self.read_exact(&mut buf));
Ok(T::read_u32(&buf))
}
/// Reads a signed 32 bit integer from the underlying reader.
#[inline]
fn read_i32<T: ByteOrder>(&mut self) -> Result<i32> {
let mut buf = [0; 4];
try!(self.read_exact(&mut buf));
Ok(T::read_i32(&buf))
}
/// Reads an unsigned 64 bit integer from the underlying reader.
#[inline]
fn read_u64<T: ByteOrder>(&mut self) -> Result<u64> {
let mut buf = [0; 8];
try!(self.read_exact(&mut buf));
Ok(T::read_u64(&buf))
}
/// Reads a signed 64 bit integer from the underlying reader.
#[inline]
fn read_i64<T: ByteOrder>(&mut self) -> Result<i64> {
let mut buf = [0; 8];
try!(self.read_exact(&mut buf));
Ok(T::read_i64(&buf))
}
/// Reads an unsigned n-bytes integer from the underlying reader.
#[inline]
fn read_uint<T: ByteOrder>(&mut self, nbytes: usize) -> Result<u64> {
let mut buf = [0; 8];
try!(self.read_exact(&mut buf[..nbytes]));
Ok(T::read_uint(&buf[..nbytes], nbytes))
}
/// Reads a signed n-bytes integer from the underlying reader.
#[inline]
fn read_int<T: ByteOrder>(&mut self, nbytes: usize) -> Result<i64> {
let mut buf = [0; 8];
try!(self.read_exact(&mut buf[..nbytes]));
Ok(T::read_int(&buf[..nbytes], nbytes))
}
/// Reads a IEEE754 single-precision (4 bytes) floating point number from
/// the underlying reader.
#[inline]
fn read_f32<T: ByteOrder>(&mut self) -> Result<f32> {
let mut buf = [0; 4];
try!(self.read_exact(&mut buf));
Ok(T::read_f32(&buf))
}
/// Reads a IEEE754 double-precision (8 bytes) floating point number from
/// the underlying reader.
#[inline]
fn read_f64<T: ByteOrder>(&mut self) -> Result<f64> {
let mut buf = [0; 8];
try!(self.read_exact(&mut buf));
Ok(T::read_f64(&buf))
}
}
/// All types that implement `Read` get methods defined in `ReadBytesExt`
/// for free.
impl<R: io::Read + ?Sized> ReadBytesExt for R {}
/// Extends `Write` with methods for writing numbers. (For `std::io`.)
///
/// Most of the methods defined here have an unconstrained type parameter that
/// must be explicitly instantiated. Typically, it is instantiated with either
/// the `BigEndian` or `LittleEndian` types defined in this crate.
///
/// # Examples
///
/// Write unsigned 16 bit big-endian integers to a `Write`:
///
/// ```rust
/// use byteorder::{BigEndian, WriteBytesExt};
///
/// let mut wtr = vec![];
/// wtr.write_u16::<BigEndian>(517).unwrap();
/// wtr.write_u16::<BigEndian>(768).unwrap();
/// assert_eq!(wtr, vec![2, 5, 3, 0]);
/// ```
pub trait WriteBytesExt: io::Write {
/// Writes an unsigned 8 bit integer to the underlying writer.
///
/// Note that since this writes a single byte, no byte order conversions
/// are used. It is included for completeness.
#[inline]
fn write_u8(&mut self, n: u8) -> Result<()> {
self.write_all(&[n])
}
/// Writes a signed 8 bit integer to the underlying writer.
///
/// Note that since this writes a single byte, no byte order conversions
/// are used. It is included for completeness.
#[inline]
fn write_i8(&mut self, n: i8) -> Result<()> {
self.write_all(&[n as u8])
}
/// Writes an unsigned 16 bit integer to the underlying writer.
#[inline]
fn write_u16<T: ByteOrder>(&mut self, n: u16) -> Result<()> {
let mut buf = [0; 2];
T::write_u16(&mut buf, n);
self.write_all(&buf)
}
/// Writes a signed 16 bit integer to the underlying writer.
#[inline]
fn write_i16<T: ByteOrder>(&mut self, n: i16) -> Result<()> {
let mut buf = [0; 2];
T::write_i16(&mut buf, n);
self.write_all(&buf)
}
/// Writes an unsigned 32 bit integer to the underlying writer.
#[inline]
fn write_u32<T: ByteOrder>(&mut self, n: u32) -> Result<()> {
let mut buf = [0; 4];
T::write_u32(&mut buf, n);
self.write_all(&buf)
}
/// Writes a signed 32 bit integer to the underlying writer.
#[inline]
fn write_i32<T: ByteOrder>(&mut self, n: i32) -> Result<()> {
let mut buf = [0; 4];
T::write_i32(&mut buf, n);
self.write_all(&buf)
}
/// Writes an unsigned 64 bit integer to the underlying writer.
#[inline]
fn write_u64<T: ByteOrder>(&mut self, n: u64) -> Result<()> {
let mut buf = [0; 8];
T::write_u64(&mut buf, n);
self.write_all(&buf)
}
/// Writes a signed 64 bit integer to the underlying writer.
#[inline]
fn write_i64<T: ByteOrder>(&mut self, n: i64) -> Result<()> {
let mut buf = [0; 8];
T::write_i64(&mut buf, n);
self.write_all(&buf)
}
/// Writes an unsigned n-bytes integer to the underlying writer.
///
/// If the given integer is not representable in the given number of bytes,
/// this method panics. If `nbytes > 8`, this method panics.
#[inline]
fn write_uint<T: ByteOrder>(
&mut self,
n: u64,
nbytes: usize,
) -> Result<()> {
let mut buf = [0; 8];
T::write_uint(&mut buf, n, nbytes);
self.write_all(&buf[0..nbytes])
}
/// Writes a signed n-bytes integer to the underlying writer.
///
/// If the given integer is not representable in the given number of bytes,
/// this method panics. If `nbytes > 8`, this method panics.
#[inline]
fn write_int<T: ByteOrder>(
&mut self,
n: i64,
nbytes: usize,
) -> Result<()> {
let mut buf = [0; 8];
T::write_int(&mut buf, n, nbytes);
self.write_all(&buf[0..nbytes])
}
/// Writes a IEEE754 single-precision (4 bytes) floating point number to
/// the underlying writer.
#[inline]
fn write_f32<T: ByteOrder>(&mut self, n: f32) -> Result<()> {
let mut buf = [0; 4];
T::write_f32(&mut buf, n);
self.write_all(&buf)
}
/// Writes a IEEE754 double-precision (8 bytes) floating point number to
/// the underlying writer.
#[inline]
fn write_f64<T: ByteOrder>(&mut self, n: f64) -> Result<()> {
let mut buf = [0; 8];
T::write_f64(&mut buf, n);
self.write_all(&buf)
}
}
/// All types that implement `Write` get methods defined in `WriteBytesExt`
/// for free.
impl<W: io::Write + ?Sized> WriteBytesExt for W {}
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