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artiq-zynq/src/libio/proto.rs

166 lines
4.3 KiB
Rust

#[cfg(feature = "alloc")]
use alloc::{string::String, vec};
use core::str::Utf8Error;
use byteorder::{ByteOrder, NativeEndian};
use core_io::{Error as IoError, Read, Write};
#[allow(dead_code)]
#[derive(Debug, Clone, PartialEq)]
pub enum ReadStringError<T> {
Utf8(Utf8Error),
Other(T),
}
pub trait ProtoRead {
type ReadError;
fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Self::ReadError>;
#[inline]
fn read_u8(&mut self) -> Result<u8, Self::ReadError> {
let mut bytes = [0; 1];
self.read_exact(&mut bytes)?;
Ok(bytes[0])
}
#[inline]
fn read_u16(&mut self) -> Result<u16, Self::ReadError> {
let mut bytes = [0; 2];
self.read_exact(&mut bytes)?;
Ok(NativeEndian::read_u16(&bytes))
}
#[inline]
fn read_u32(&mut self) -> Result<u32, Self::ReadError> {
let mut bytes = [0; 4];
self.read_exact(&mut bytes)?;
Ok(NativeEndian::read_u32(&bytes))
}
#[inline]
fn read_u64(&mut self) -> Result<u64, Self::ReadError> {
let mut bytes = [0; 8];
self.read_exact(&mut bytes)?;
Ok(NativeEndian::read_u64(&bytes))
}
#[inline]
fn read_bool(&mut self) -> Result<bool, Self::ReadError> {
Ok(self.read_u8()? != 0)
}
#[inline]
#[cfg(feature = "alloc")]
fn read_bytes(&mut self) -> Result<vec::Vec<u8>, Self::ReadError> {
let length = self.read_u32()?;
let mut value = vec![0; length as usize];
self.read_exact(&mut value)?;
Ok(value)
}
#[inline]
#[cfg(feature = "alloc")]
fn read_string(&mut self) -> Result<String, ReadStringError<Self::ReadError>> {
let bytes = self.read_bytes().map_err(ReadStringError::Other)?;
String::from_utf8(bytes).map_err(|err| ReadStringError::Utf8(err.utf8_error()))
}
}
pub trait ProtoWrite {
type WriteError;
fn write_all(&mut self, buf: &[u8]) -> Result<(), Self::WriteError>;
#[inline]
fn write_u8(&mut self, value: u8) -> Result<(), Self::WriteError> {
let bytes = [value; 1];
self.write_all(&bytes)
}
#[inline]
fn write_i8(&mut self, value: i8) -> Result<(), Self::WriteError> {
let bytes = [value as u8; 1];
self.write_all(&bytes)
}
#[inline]
fn write_u16(&mut self, value: u16) -> Result<(), Self::WriteError> {
let mut bytes = [0; 2];
NativeEndian::write_u16(&mut bytes, value);
self.write_all(&bytes)
}
#[inline]
fn write_i16(&mut self, value: i16) -> Result<(), Self::WriteError> {
let mut bytes = [0; 2];
NativeEndian::write_i16(&mut bytes, value);
self.write_all(&bytes)
}
#[inline]
fn write_u32(&mut self, value: u32) -> Result<(), Self::WriteError> {
let mut bytes = [0; 4];
NativeEndian::write_u32(&mut bytes, value);
self.write_all(&bytes)
}
#[inline]
fn write_i32(&mut self, value: i32) -> Result<(), Self::WriteError> {
let mut bytes = [0; 4];
NativeEndian::write_i32(&mut bytes, value);
self.write_all(&bytes)
}
#[inline]
fn write_u64(&mut self, value: u64) -> Result<(), Self::WriteError> {
let mut bytes = [0; 8];
NativeEndian::write_u64(&mut bytes, value);
self.write_all(&bytes)
}
#[inline]
fn write_i64(&mut self, value: i64) -> Result<(), Self::WriteError> {
let mut bytes = [0; 8];
NativeEndian::write_i64(&mut bytes, value);
self.write_all(&bytes)
}
#[inline]
fn write_bool(&mut self, value: bool) -> Result<(), Self::WriteError> {
self.write_u8(value as u8)
}
#[inline]
fn write_bytes(&mut self, value: &[u8]) -> Result<(), Self::WriteError> {
self.write_u32(value.len() as u32)?;
self.write_all(value)
}
#[inline]
#[cfg(feature = "alloc")]
fn write_string(&mut self, value: &str) -> Result<(), Self::WriteError> {
self.write_bytes(value.as_bytes())
}
}
impl<T> ProtoRead for T
where T: Read + ?Sized
{
type ReadError = IoError;
fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Self::ReadError> {
T::read_exact(self, buf)
}
}
impl<T> ProtoWrite for T
where T: Write + ?Sized
{
type WriteError = IoError;
fn write_all(&mut self, buf: &[u8]) -> Result<(), Self::WriteError> {
T::write_all(self, buf)
}
}