Add more from the std
This commit is contained in:
717
crates/std/src/io/impls.rs
Normal file
717
crates/std/src/io/impls.rs
Normal file
@@ -0,0 +1,717 @@
|
||||
// #[cfg(test)]
|
||||
// mod tests;
|
||||
|
||||
use crate::alloc::Allocator;
|
||||
use alloc_crate::collections::VecDeque;
|
||||
use crate::io::{self, BorrowedCursor, BufRead, IoSlice, IoSliceMut, Read, Seek, SeekFrom, Write};
|
||||
use crate::{cmp, fmt, mem, str};
|
||||
|
||||
// =============================================================================
|
||||
// Forwarding implementations
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<R: Read + ?Sized> Read for &mut R {
|
||||
#[inline]
|
||||
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
|
||||
(**self).read(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_buf(&mut self, cursor: BorrowedCursor<'_>) -> io::Result<()> {
|
||||
(**self).read_buf(cursor)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
|
||||
(**self).read_vectored(bufs)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn is_read_vectored(&self) -> bool {
|
||||
(**self).is_read_vectored()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
|
||||
(**self).read_to_end(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
|
||||
(**self).read_to_string(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
|
||||
(**self).read_exact(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> io::Result<()> {
|
||||
(**self).read_buf_exact(cursor)
|
||||
}
|
||||
}
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<W: Write + ?Sized> Write for &mut W {
|
||||
#[inline]
|
||||
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
|
||||
(**self).write(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
|
||||
(**self).write_vectored(bufs)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn is_write_vectored(&self) -> bool {
|
||||
(**self).is_write_vectored()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn flush(&mut self) -> io::Result<()> {
|
||||
(**self).flush()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
|
||||
(**self).write_all(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
|
||||
(**self).write_all_vectored(bufs)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_fmt(&mut self, fmt: fmt::Arguments<'_>) -> io::Result<()> {
|
||||
(**self).write_fmt(fmt)
|
||||
}
|
||||
}
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<S: Seek + ?Sized> Seek for &mut S {
|
||||
#[inline]
|
||||
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
|
||||
(**self).seek(pos)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn rewind(&mut self) -> io::Result<()> {
|
||||
(**self).rewind()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn stream_len(&mut self) -> io::Result<u64> {
|
||||
(**self).stream_len()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn stream_position(&mut self) -> io::Result<u64> {
|
||||
(**self).stream_position()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn seek_relative(&mut self, offset: i64) -> io::Result<()> {
|
||||
(**self).seek_relative(offset)
|
||||
}
|
||||
}
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<B: BufRead + ?Sized> BufRead for &mut B {
|
||||
#[inline]
|
||||
fn fill_buf(&mut self) -> io::Result<&[u8]> {
|
||||
(**self).fill_buf()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn consume(&mut self, amt: usize) {
|
||||
(**self).consume(amt)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn has_data_left(&mut self) -> io::Result<bool> {
|
||||
(**self).has_data_left()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> io::Result<usize> {
|
||||
(**self).read_until(byte, buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn skip_until(&mut self, byte: u8) -> io::Result<usize> {
|
||||
(**self).skip_until(byte)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_line(&mut self, buf: &mut String) -> io::Result<usize> {
|
||||
(**self).read_line(buf)
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<R: Read + ?Sized> Read for Box<R> {
|
||||
#[inline]
|
||||
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
|
||||
(**self).read(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_buf(&mut self, cursor: BorrowedCursor<'_>) -> io::Result<()> {
|
||||
(**self).read_buf(cursor)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
|
||||
(**self).read_vectored(bufs)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn is_read_vectored(&self) -> bool {
|
||||
(**self).is_read_vectored()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
|
||||
(**self).read_to_end(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
|
||||
(**self).read_to_string(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
|
||||
(**self).read_exact(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> io::Result<()> {
|
||||
(**self).read_buf_exact(cursor)
|
||||
}
|
||||
}
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<W: Write + ?Sized> Write for Box<W> {
|
||||
#[inline]
|
||||
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
|
||||
(**self).write(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
|
||||
(**self).write_vectored(bufs)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn is_write_vectored(&self) -> bool {
|
||||
(**self).is_write_vectored()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn flush(&mut self) -> io::Result<()> {
|
||||
(**self).flush()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
|
||||
(**self).write_all(buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
|
||||
(**self).write_all_vectored(bufs)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_fmt(&mut self, fmt: fmt::Arguments<'_>) -> io::Result<()> {
|
||||
(**self).write_fmt(fmt)
|
||||
}
|
||||
}
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<S: Seek + ?Sized> Seek for Box<S> {
|
||||
#[inline]
|
||||
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
|
||||
(**self).seek(pos)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn rewind(&mut self) -> io::Result<()> {
|
||||
(**self).rewind()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn stream_len(&mut self) -> io::Result<u64> {
|
||||
(**self).stream_len()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn stream_position(&mut self) -> io::Result<u64> {
|
||||
(**self).stream_position()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn seek_relative(&mut self, offset: i64) -> io::Result<()> {
|
||||
(**self).seek_relative(offset)
|
||||
}
|
||||
}
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<B: BufRead + ?Sized> BufRead for Box<B> {
|
||||
#[inline]
|
||||
fn fill_buf(&mut self) -> io::Result<&[u8]> {
|
||||
(**self).fill_buf()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn consume(&mut self, amt: usize) {
|
||||
(**self).consume(amt)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn has_data_left(&mut self) -> io::Result<bool> {
|
||||
(**self).has_data_left()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> io::Result<usize> {
|
||||
(**self).read_until(byte, buf)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn skip_until(&mut self, byte: u8) -> io::Result<usize> {
|
||||
(**self).skip_until(byte)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_line(&mut self, buf: &mut String) -> io::Result<usize> {
|
||||
(**self).read_line(buf)
|
||||
}
|
||||
}
|
||||
|
||||
// =============================================================================
|
||||
// In-memory buffer implementations
|
||||
|
||||
/// Read is implemented for `&[u8]` by copying from the slice.
|
||||
///
|
||||
/// Note that reading updates the slice to point to the yet unread part.
|
||||
/// The slice will be empty when EOF is reached.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl Read for &[u8] {
|
||||
#[inline]
|
||||
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
|
||||
let amt = cmp::min(buf.len(), self.len());
|
||||
let (a, b) = self.split_at(amt);
|
||||
|
||||
// First check if the amount of bytes we want to read is small:
|
||||
// `copy_from_slice` will generally expand to a call to `memcpy`, and
|
||||
// for a single byte the overhead is significant.
|
||||
if amt == 1 {
|
||||
buf[0] = a[0];
|
||||
} else {
|
||||
buf[..amt].copy_from_slice(a);
|
||||
}
|
||||
|
||||
*self = b;
|
||||
Ok(amt)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_buf(&mut self, mut cursor: BorrowedCursor<'_>) -> io::Result<()> {
|
||||
let amt = cmp::min(cursor.capacity(), self.len());
|
||||
let (a, b) = self.split_at(amt);
|
||||
|
||||
cursor.append(a);
|
||||
|
||||
*self = b;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
|
||||
let mut nread = 0;
|
||||
for buf in bufs {
|
||||
nread += self.read(buf)?;
|
||||
if self.is_empty() {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
Ok(nread)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn is_read_vectored(&self) -> bool {
|
||||
true
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
|
||||
if buf.len() > self.len() {
|
||||
// `read_exact` makes no promise about the content of `buf` if it
|
||||
// fails so don't bother about that.
|
||||
*self = &self[self.len()..];
|
||||
return Err(io::Error::READ_EXACT_EOF);
|
||||
}
|
||||
let (a, b) = self.split_at(buf.len());
|
||||
|
||||
// First check if the amount of bytes we want to read is small:
|
||||
// `copy_from_slice` will generally expand to a call to `memcpy`, and
|
||||
// for a single byte the overhead is significant.
|
||||
if buf.len() == 1 {
|
||||
buf[0] = a[0];
|
||||
} else {
|
||||
buf.copy_from_slice(a);
|
||||
}
|
||||
|
||||
*self = b;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_buf_exact(&mut self, mut cursor: BorrowedCursor<'_>) -> io::Result<()> {
|
||||
if cursor.capacity() > self.len() {
|
||||
// Append everything we can to the cursor.
|
||||
cursor.append(*self);
|
||||
*self = &self[self.len()..];
|
||||
return Err(io::Error::READ_EXACT_EOF);
|
||||
}
|
||||
let (a, b) = self.split_at(cursor.capacity());
|
||||
|
||||
cursor.append(a);
|
||||
|
||||
*self = b;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
|
||||
let len = self.len();
|
||||
buf.try_reserve(len)?;
|
||||
buf.extend_from_slice(*self);
|
||||
*self = &self[len..];
|
||||
Ok(len)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
|
||||
let content = str::from_utf8(self).map_err(|_| io::Error::INVALID_UTF8)?;
|
||||
let len = self.len();
|
||||
buf.try_reserve(len)?;
|
||||
buf.push_str(content);
|
||||
*self = &self[len..];
|
||||
Ok(len)
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl BufRead for &[u8] {
|
||||
#[inline]
|
||||
fn fill_buf(&mut self) -> io::Result<&[u8]> {
|
||||
Ok(*self)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn consume(&mut self, amt: usize) {
|
||||
*self = &self[amt..];
|
||||
}
|
||||
}
|
||||
|
||||
/// Write is implemented for `&mut [u8]` by copying into the slice, overwriting
|
||||
/// its data.
|
||||
///
|
||||
/// Note that writing updates the slice to point to the yet unwritten part.
|
||||
/// The slice will be empty when it has been completely overwritten.
|
||||
///
|
||||
/// If the number of bytes to be written exceeds the size of the slice, write operations will
|
||||
/// return short writes: ultimately, `Ok(0)`; in this situation, `write_all` returns an error of
|
||||
/// kind `ErrorKind::WriteZero`.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl Write for &mut [u8] {
|
||||
#[inline]
|
||||
fn write(&mut self, data: &[u8]) -> io::Result<usize> {
|
||||
let amt = cmp::min(data.len(), self.len());
|
||||
let (a, b) = mem::take(self).split_at_mut(amt);
|
||||
a.copy_from_slice(&data[..amt]);
|
||||
*self = b;
|
||||
Ok(amt)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
|
||||
let mut nwritten = 0;
|
||||
for buf in bufs {
|
||||
nwritten += self.write(buf)?;
|
||||
if self.is_empty() {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
Ok(nwritten)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn is_write_vectored(&self) -> bool {
|
||||
true
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all(&mut self, data: &[u8]) -> io::Result<()> {
|
||||
if self.write(data)? < data.len() { Err(io::Error::WRITE_ALL_EOF) } else { Ok(()) }
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
|
||||
for buf in bufs {
|
||||
if self.write(buf)? < buf.len() {
|
||||
return Err(io::Error::WRITE_ALL_EOF);
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn flush(&mut self) -> io::Result<()> {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
/// Write is implemented for `Vec<u8>` by appending to the vector.
|
||||
/// The vector will grow as needed.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<A: Allocator> Write for Vec<u8, A> {
|
||||
#[inline]
|
||||
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
|
||||
self.extend_from_slice(buf);
|
||||
Ok(buf.len())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
|
||||
let len = bufs.iter().map(|b| b.len()).sum();
|
||||
self.reserve(len);
|
||||
for buf in bufs {
|
||||
self.extend_from_slice(buf);
|
||||
}
|
||||
Ok(len)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn is_write_vectored(&self) -> bool {
|
||||
true
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
|
||||
self.extend_from_slice(buf);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
|
||||
self.write_vectored(bufs)?;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn flush(&mut self) -> io::Result<()> {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
/// Read is implemented for `VecDeque<u8>` by consuming bytes from the front of the `VecDeque`.
|
||||
#[stable(feature = "vecdeque_read_write", since = "1.63.0")]
|
||||
impl<A: Allocator> Read for VecDeque<u8, A> {
|
||||
/// Fill `buf` with the contents of the "front" slice as returned by
|
||||
/// [`as_slices`][`VecDeque::as_slices`]. If the contained byte slices of the `VecDeque` are
|
||||
/// discontiguous, multiple calls to `read` will be needed to read the entire content.
|
||||
#[inline]
|
||||
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
|
||||
let (ref mut front, _) = self.as_slices();
|
||||
let n = Read::read(front, buf)?;
|
||||
self.drain(..n);
|
||||
Ok(n)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
|
||||
let (front, back) = self.as_slices();
|
||||
|
||||
// Use only the front buffer if it is big enough to fill `buf`, else use
|
||||
// the back buffer too.
|
||||
match buf.split_at_mut_checked(front.len()) {
|
||||
None => buf.copy_from_slice(&front[..buf.len()]),
|
||||
Some((buf_front, buf_back)) => match back.split_at_checked(buf_back.len()) {
|
||||
Some((back, _)) => {
|
||||
buf_front.copy_from_slice(front);
|
||||
buf_back.copy_from_slice(back);
|
||||
}
|
||||
None => {
|
||||
self.clear();
|
||||
return Err(io::Error::READ_EXACT_EOF);
|
||||
}
|
||||
},
|
||||
}
|
||||
|
||||
self.drain(..buf.len());
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_buf(&mut self, cursor: BorrowedCursor<'_>) -> io::Result<()> {
|
||||
let (ref mut front, _) = self.as_slices();
|
||||
let n = cmp::min(cursor.capacity(), front.len());
|
||||
Read::read_buf(front, cursor)?;
|
||||
self.drain(..n);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_buf_exact(&mut self, mut cursor: BorrowedCursor<'_>) -> io::Result<()> {
|
||||
let len = cursor.capacity();
|
||||
let (front, back) = self.as_slices();
|
||||
|
||||
match front.split_at_checked(cursor.capacity()) {
|
||||
Some((front, _)) => cursor.append(front),
|
||||
None => {
|
||||
cursor.append(front);
|
||||
match back.split_at_checked(cursor.capacity()) {
|
||||
Some((back, _)) => cursor.append(back),
|
||||
None => {
|
||||
cursor.append(back);
|
||||
self.clear();
|
||||
return Err(io::Error::READ_EXACT_EOF);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
self.drain(..len);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
|
||||
// The total len is known upfront so we can reserve it in a single call.
|
||||
let len = self.len();
|
||||
buf.try_reserve(len)?;
|
||||
|
||||
let (front, back) = self.as_slices();
|
||||
buf.extend_from_slice(front);
|
||||
buf.extend_from_slice(back);
|
||||
self.clear();
|
||||
Ok(len)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
|
||||
// SAFETY: We only append to the buffer
|
||||
unsafe { io::append_to_string(buf, |buf| self.read_to_end(buf)) }
|
||||
}
|
||||
}
|
||||
|
||||
/// BufRead is implemented for `VecDeque<u8>` by reading bytes from the front of the `VecDeque`.
|
||||
#[stable(feature = "vecdeque_buf_read", since = "1.75.0")]
|
||||
impl<A: Allocator> BufRead for VecDeque<u8, A> {
|
||||
/// Returns the contents of the "front" slice as returned by
|
||||
/// [`as_slices`][`VecDeque::as_slices`]. If the contained byte slices of the `VecDeque` are
|
||||
/// discontiguous, multiple calls to `fill_buf` will be needed to read the entire content.
|
||||
#[inline]
|
||||
fn fill_buf(&mut self) -> io::Result<&[u8]> {
|
||||
let (front, _) = self.as_slices();
|
||||
Ok(front)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn consume(&mut self, amt: usize) {
|
||||
self.drain(..amt);
|
||||
}
|
||||
}
|
||||
|
||||
/// Write is implemented for `VecDeque<u8>` by appending to the `VecDeque`, growing it as needed.
|
||||
#[stable(feature = "vecdeque_read_write", since = "1.63.0")]
|
||||
impl<A: Allocator> Write for VecDeque<u8, A> {
|
||||
#[inline]
|
||||
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
|
||||
self.extend(buf);
|
||||
Ok(buf.len())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
|
||||
let len = bufs.iter().map(|b| b.len()).sum();
|
||||
self.reserve(len);
|
||||
for buf in bufs {
|
||||
self.extend(&**buf);
|
||||
}
|
||||
Ok(len)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn is_write_vectored(&self) -> bool {
|
||||
true
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
|
||||
self.extend(buf);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
|
||||
self.write_vectored(bufs)?;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn flush(&mut self) -> io::Result<()> {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
#[unstable(feature = "read_buf", issue = "78485")]
|
||||
impl<'a> io::Write for core::io::BorrowedCursor<'a> {
|
||||
#[inline]
|
||||
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
|
||||
let amt = cmp::min(buf.len(), self.capacity());
|
||||
self.append(&buf[..amt]);
|
||||
Ok(amt)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
|
||||
let mut nwritten = 0;
|
||||
for buf in bufs {
|
||||
let n = self.write(buf)?;
|
||||
nwritten += n;
|
||||
if n < buf.len() {
|
||||
break;
|
||||
}
|
||||
}
|
||||
Ok(nwritten)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn is_write_vectored(&self) -> bool {
|
||||
true
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
|
||||
if self.write(buf)? < buf.len() { Err(io::Error::WRITE_ALL_EOF) } else { Ok(()) }
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
|
||||
for buf in bufs {
|
||||
if self.write(buf)? < buf.len() {
|
||||
return Err(io::Error::WRITE_ALL_EOF);
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn flush(&mut self) -> io::Result<()> {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user