forked from abdul124/rust-core_io
290 lines
7.6 KiB
Rust
290 lines
7.6 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#[cfg(feature="alloc")] use alloc::boxed::Box;
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use core::cmp;
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use io::{self, SeekFrom, Read, Write, Seek, Error, ErrorKind};
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#[cfg(feature="collections")] use io::BufRead;
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use core::fmt;
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use core::mem;
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#[cfg(feature="collections")] use collections::string::String;
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#[cfg(feature="collections")] use collections::vec::Vec;
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// =============================================================================
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// Forwarding implementations
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impl<'a, R: Read + ?Sized> Read for &'a mut R {
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#[inline]
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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(**self).read(buf)
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}
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#[cfg(feature="collections")]
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#[inline]
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fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
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(**self).read_to_end(buf)
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}
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#[cfg(feature="collections")]
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#[inline]
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fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
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(**self).read_to_string(buf)
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}
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#[inline]
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fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
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(**self).read_exact(buf)
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}
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}
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impl<'a, W: Write + ?Sized> Write for &'a mut W {
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#[inline]
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> { (**self).write(buf) }
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#[inline]
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fn flush(&mut self) -> io::Result<()> { (**self).flush() }
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#[inline]
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fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
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(**self).write_all(buf)
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}
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#[inline]
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fn write_fmt(&mut self, fmt: fmt::Arguments) -> io::Result<()> {
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(**self).write_fmt(fmt)
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}
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}
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impl<'a, S: Seek + ?Sized> Seek for &'a mut S {
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#[inline]
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fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> { (**self).seek(pos) }
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}
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#[cfg(feature="collections")]
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impl<'a, B: BufRead + ?Sized> BufRead for &'a mut B {
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#[inline]
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fn fill_buf(&mut self) -> io::Result<&[u8]> { (**self).fill_buf() }
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#[inline]
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fn consume(&mut self, amt: usize) { (**self).consume(amt) }
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#[inline]
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fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> io::Result<usize> {
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(**self).read_until(byte, buf)
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}
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#[inline]
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fn read_line(&mut self, buf: &mut String) -> io::Result<usize> {
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(**self).read_line(buf)
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}
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}
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#[cfg(feature="alloc")]
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impl<R: Read + ?Sized> Read for Box<R> {
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#[inline]
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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(**self).read(buf)
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}
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#[cfg(feature="collections")]
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#[inline]
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fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
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(**self).read_to_end(buf)
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}
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#[cfg(feature="collections")]
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#[inline]
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fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
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(**self).read_to_string(buf)
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}
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#[inline]
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fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
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(**self).read_exact(buf)
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}
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}
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#[cfg(feature="alloc")]
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impl<W: Write + ?Sized> Write for Box<W> {
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#[inline]
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> { (**self).write(buf) }
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#[inline]
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fn flush(&mut self) -> io::Result<()> { (**self).flush() }
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#[inline]
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fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
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(**self).write_all(buf)
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}
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#[inline]
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fn write_fmt(&mut self, fmt: fmt::Arguments) -> io::Result<()> {
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(**self).write_fmt(fmt)
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}
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}
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#[cfg(feature="alloc")]
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impl<S: Seek + ?Sized> Seek for Box<S> {
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#[inline]
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fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> { (**self).seek(pos) }
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}
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#[cfg(feature="collections")]
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impl<B: BufRead + ?Sized> BufRead for Box<B> {
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#[inline]
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fn fill_buf(&mut self) -> io::Result<&[u8]> { (**self).fill_buf() }
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#[inline]
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fn consume(&mut self, amt: usize) { (**self).consume(amt) }
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#[inline]
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fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> io::Result<usize> {
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(**self).read_until(byte, buf)
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}
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#[inline]
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fn read_line(&mut self, buf: &mut String) -> io::Result<usize> {
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(**self).read_line(buf)
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}
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}
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// =============================================================================
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// In-memory buffer implementations
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impl<'a> Read for &'a [u8] {
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#[inline]
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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let amt = cmp::min(buf.len(), self.len());
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let (a, b) = self.split_at(amt);
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buf[..amt].copy_from_slice(a);
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*self = b;
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Ok(amt)
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}
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#[inline]
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fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
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if buf.len() > self.len() {
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return Err(Error::new(ErrorKind::UnexpectedEof,
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"failed to fill whole buffer"));
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}
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let (a, b) = self.split_at(buf.len());
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buf.copy_from_slice(a);
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*self = b;
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Ok(())
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}
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}
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#[cfg(feature="collections")]
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impl<'a> BufRead for &'a [u8] {
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#[inline]
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fn fill_buf(&mut self) -> io::Result<&[u8]> { Ok(*self) }
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#[inline]
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fn consume(&mut self, amt: usize) { *self = &self[amt..]; }
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}
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impl<'a> Write for &'a mut [u8] {
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#[inline]
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fn write(&mut self, data: &[u8]) -> io::Result<usize> {
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let amt = cmp::min(data.len(), self.len());
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let (a, b) = mem::replace(self, &mut []).split_at_mut(amt);
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a.copy_from_slice(&data[..amt]);
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*self = b;
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Ok(amt)
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}
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#[inline]
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fn write_all(&mut self, data: &[u8]) -> io::Result<()> {
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if self.write(data)? == data.len() {
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Ok(())
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} else {
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Err(Error::new(ErrorKind::WriteZero, "failed to write whole buffer"))
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}
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}
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#[inline]
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fn flush(&mut self) -> io::Result<()> { Ok(()) }
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}
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#[cfg(feature="collections")]
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impl Write for Vec<u8> {
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#[inline]
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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self.extend_from_slice(buf);
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Ok(buf.len())
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}
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#[inline]
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fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
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self.extend_from_slice(buf);
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Ok(())
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}
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#[inline]
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fn flush(&mut self) -> io::Result<()> { Ok(()) }
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}
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#[cfg(test)]
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mod tests {
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use io::prelude::*;
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use vec::Vec;
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use test;
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#[bench]
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fn bench_read_slice(b: &mut test::Bencher) {
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let buf = [5; 1024];
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let mut dst = [0; 128];
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b.iter(|| {
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let mut rd = &buf[..];
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for _ in 0..8 {
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let _ = rd.read(&mut dst);
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test::black_box(&dst);
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}
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})
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}
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#[bench]
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fn bench_write_slice(b: &mut test::Bencher) {
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let mut buf = [0; 1024];
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let src = [5; 128];
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b.iter(|| {
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let mut wr = &mut buf[..];
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for _ in 0..8 {
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let _ = wr.write_all(&src);
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test::black_box(&wr);
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}
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})
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}
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#[bench]
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fn bench_read_vec(b: &mut test::Bencher) {
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let buf = vec![5; 1024];
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let mut dst = [0; 128];
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b.iter(|| {
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let mut rd = &buf[..];
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for _ in 0..8 {
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let _ = rd.read(&mut dst);
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test::black_box(&dst);
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}
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})
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}
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#[bench]
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fn bench_write_vec(b: &mut test::Bencher) {
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let mut buf = Vec::with_capacity(1024);
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let src = [5; 128];
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b.iter(|| {
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let mut wr = &mut buf[..];
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for _ in 0..8 {
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let _ = wr.write_all(&src);
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test::black_box(&wr);
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}
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})
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}
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}
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