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firmware: extract io::Cursor into its own file.

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Also remove unused io::CursorError.
This commit is contained in:
whitequark 2018-05-15 06:24:04 +00:00
parent a4ab236af3
commit 9e8f8bb669
2 changed files with 89 additions and 90 deletions
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86
artiq/firmware/libio/cursor.rs Normal file
View File

@ -0,0 +1,86 @@
use {Read, Write};
#[derive(Debug, Clone)]
pub struct Cursor<T> {
inner: T,
pos: usize
}
impl<T> Cursor<T> {
#[inline]
pub fn new(inner: T) -> Cursor<T> {
Cursor { inner, pos: 0 }
}
#[inline]
pub fn into_inner(self) -> T {
self.inner
}
#[inline]
pub fn get_ref(&self) -> &T {
&self.inner
}
#[inline]
pub fn get_mut(&mut self) -> &mut T {
&mut self.inner
}
#[inline]
pub fn position(&self) -> usize {
self.pos
}
#[inline]
pub fn set_position(&mut self, pos: usize) {
self.pos = pos
}
}
impl<T: AsRef<[u8]>> Read for Cursor<T> {
type ReadError = !;
fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::ReadError> {
let data = &self.inner.as_ref()[self.pos..];
let len = buf.len().min(data.len());
buf[..len].copy_from_slice(&data[..len]);
self.pos += len;
Ok(len)
}
}
impl<'a> Write for Cursor<&'a mut [u8]> {
type WriteError = !;
type FlushError = !;
fn write(&mut self, buf: &[u8]) -> Result<usize, Self::WriteError> {
let data = &mut self.inner[self.pos..];
let len = buf.len().min(data.len());
data[..len].copy_from_slice(&buf[..len]);
self.pos += len;
Ok(len)
}
#[inline]
fn flush(&mut self) -> Result<(), Self::FlushError> {
Ok(())
}
}
#[cfg(feature = "alloc")]
impl Write for Cursor<::alloc::Vec<u8>> {
type WriteError = !;
type FlushError = !;
#[inline]
fn write(&mut self, buf: &[u8]) -> Result<usize, Self::WriteError> {
self.inner.extend_from_slice(buf);
Ok(buf.len())
}
#[inline]
fn flush(&mut self) -> Result<(), Self::FlushError> {
Ok(())
}
}

93
artiq/firmware/libio/lib.rs
View File

@ -11,9 +11,12 @@ extern crate byteorder;
use core::result;
use core::fmt;
mod cursor;
#[cfg(feature = "byteorder")]
pub mod proto;
pub use cursor::Cursor;
pub type Result<T, E> = result::Result<T, Error<E>>;
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
@ -152,93 +155,3 @@ impl<'a> Write for alloc::Vec<u8> {
Ok(())
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum CursorError {
EndOfBuffer
}
#[derive(Debug, Clone)]
pub struct Cursor<T> {
inner: T,
pos: usize
}
impl<T> Cursor<T> {
#[inline]
pub fn new(inner: T) -> Cursor<T> {
Cursor { inner, pos: 0 }
}
#[inline]
pub fn into_inner(self) -> T {
self.inner
}
#[inline]
pub fn get_ref(&self) -> &T {
&self.inner
}
#[inline]
pub fn get_mut(&mut self) -> &mut T {
&mut self.inner
}
#[inline]
pub fn position(&self) -> usize {
self.pos
}
#[inline]
pub fn set_position(&mut self, pos: usize) {
self.pos = pos
}
}
impl<T: AsRef<[u8]>> Read for Cursor<T> {
type ReadError = !;
fn read(&mut self, buf: &mut [u8]) -> result::Result<usize, Self::ReadError> {
let data = &self.inner.as_ref()[self.pos..];
let len = buf.len().min(data.len());
buf[..len].copy_from_slice(&data[..len]);
self.pos += len;
Ok(len)
}
}
impl<'a> Write for Cursor<&'a mut [u8]> {
type WriteError = !;
type FlushError = !;
fn write(&mut self, buf: &[u8]) -> result::Result<usize, Self::WriteError> {
let data = &mut self.inner[self.pos..];
let len = buf.len().min(data.len());
data[..len].copy_from_slice(&buf[..len]);
self.pos += len;
Ok(len)
}
#[inline]
fn flush(&mut self) -> result::Result<(), Self::FlushError> {
Ok(())
}
}
#[cfg(feature = "alloc")]
impl Write for Cursor<::alloc::Vec<u8>> {
type WriteError = !;
type FlushError = !;
#[inline]
fn write(&mut self, buf: &[u8]) -> result::Result<usize, Self::WriteError> {
self.inner.extend_from_slice(buf);
Ok(buf.len())
}
#[inline]
fn flush(&mut self) -> result::Result<(), Self::FlushError> {
Ok(())
}
}