7 self, BufRead, Error, ErrorKind, Initializer, IoSlice, IoSliceMut, Read, Seek, SeekFrom, Write,
11 // =============================================================================
12 // Forwarding implementations
14 #[stable(feature = "rust1", since = "1.0.0")]
15 impl<R: Read + ?Sized> Read for &mut R {
17 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
22 fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
23 (**self).read_vectored(bufs)
27 fn is_read_vectored(&self) -> bool {
28 (**self).is_read_vectored()
32 unsafe fn initializer(&self) -> Initializer {
33 (**self).initializer()
37 fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
38 (**self).read_to_end(buf)
42 fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
43 (**self).read_to_string(buf)
47 fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
48 (**self).read_exact(buf)
51 #[stable(feature = "rust1", since = "1.0.0")]
52 impl<W: Write + ?Sized> Write for &mut W {
54 fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
59 fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
60 (**self).write_vectored(bufs)
64 fn is_write_vectored(&self) -> bool {
65 (**self).is_write_vectored()
69 fn flush(&mut self) -> io::Result<()> {
74 fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
75 (**self).write_all(buf)
79 fn write_fmt(&mut self, fmt: fmt::Arguments<'_>) -> io::Result<()> {
80 (**self).write_fmt(fmt)
83 #[stable(feature = "rust1", since = "1.0.0")]
84 impl<S: Seek + ?Sized> Seek for &mut S {
86 fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
90 #[stable(feature = "rust1", since = "1.0.0")]
91 impl<B: BufRead + ?Sized> BufRead for &mut B {
93 fn fill_buf(&mut self) -> io::Result<&[u8]> {
98 fn consume(&mut self, amt: usize) {
103 fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> io::Result<usize> {
104 (**self).read_until(byte, buf)
108 fn read_line(&mut self, buf: &mut String) -> io::Result<usize> {
109 (**self).read_line(buf)
113 #[stable(feature = "rust1", since = "1.0.0")]
114 impl<R: Read + ?Sized> Read for Box<R> {
116 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
121 fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
122 (**self).read_vectored(bufs)
126 fn is_read_vectored(&self) -> bool {
127 (**self).is_read_vectored()
131 unsafe fn initializer(&self) -> Initializer {
132 (**self).initializer()
136 fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
137 (**self).read_to_end(buf)
141 fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
142 (**self).read_to_string(buf)
146 fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
147 (**self).read_exact(buf)
150 #[stable(feature = "rust1", since = "1.0.0")]
151 impl<W: Write + ?Sized> Write for Box<W> {
153 fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
158 fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
159 (**self).write_vectored(bufs)
163 fn is_write_vectored(&self) -> bool {
164 (**self).is_write_vectored()
168 fn flush(&mut self) -> io::Result<()> {
173 fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
174 (**self).write_all(buf)
178 fn write_fmt(&mut self, fmt: fmt::Arguments<'_>) -> io::Result<()> {
179 (**self).write_fmt(fmt)
182 #[stable(feature = "rust1", since = "1.0.0")]
183 impl<S: Seek + ?Sized> Seek for Box<S> {
185 fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
189 #[stable(feature = "rust1", since = "1.0.0")]
190 impl<B: BufRead + ?Sized> BufRead for Box<B> {
192 fn fill_buf(&mut self) -> io::Result<&[u8]> {
197 fn consume(&mut self, amt: usize) {
198 (**self).consume(amt)
202 fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> io::Result<usize> {
203 (**self).read_until(byte, buf)
207 fn read_line(&mut self, buf: &mut String) -> io::Result<usize> {
208 (**self).read_line(buf)
212 // =============================================================================
213 // In-memory buffer implementations
215 /// Read is implemented for `&[u8]` by copying from the slice.
217 /// Note that reading updates the slice to point to the yet unread part.
218 /// The slice will be empty when EOF is reached.
219 #[stable(feature = "rust1", since = "1.0.0")]
220 impl Read for &[u8] {
222 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
223 let amt = cmp::min(buf.len(), self.len());
224 let (a, b) = self.split_at(amt);
226 // First check if the amount of bytes we want to read is small:
227 // `copy_from_slice` will generally expand to a call to `memcpy`, and
228 // for a single byte the overhead is significant.
232 buf[..amt].copy_from_slice(a);
240 fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
243 nread += self.read(buf)?;
253 fn is_read_vectored(&self) -> bool {
258 unsafe fn initializer(&self) -> Initializer {
263 fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
264 if buf.len() > self.len() {
265 return Err(Error::new(ErrorKind::UnexpectedEof, "failed to fill whole buffer"));
267 let (a, b) = self.split_at(buf.len());
269 // First check if the amount of bytes we want to read is small:
270 // `copy_from_slice` will generally expand to a call to `memcpy`, and
271 // for a single byte the overhead is significant.
275 buf.copy_from_slice(a);
283 fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
284 buf.extend_from_slice(*self);
285 let len = self.len();
286 *self = &self[len..];
291 #[stable(feature = "rust1", since = "1.0.0")]
292 impl BufRead for &[u8] {
294 fn fill_buf(&mut self) -> io::Result<&[u8]> {
299 fn consume(&mut self, amt: usize) {
300 *self = &self[amt..];
304 /// Write is implemented for `&mut [u8]` by copying into the slice, overwriting
307 /// Note that writing updates the slice to point to the yet unwritten part.
308 /// The slice will be empty when it has been completely overwritten.
310 /// If the number of bytes to be written exceeds the size of the slice, write operations will
311 /// return short writes: ultimately, `Ok(0)`; in this situation, `write_all` returns an error of
312 /// kind `ErrorKind::WriteZero`.
313 #[stable(feature = "rust1", since = "1.0.0")]
314 impl Write for &mut [u8] {
316 fn write(&mut self, data: &[u8]) -> io::Result<usize> {
317 let amt = cmp::min(data.len(), self.len());
318 let (a, b) = mem::replace(self, &mut []).split_at_mut(amt);
319 a.copy_from_slice(&data[..amt]);
325 fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
326 let mut nwritten = 0;
328 nwritten += self.write(buf)?;
338 fn is_write_vectored(&self) -> bool {
343 fn write_all(&mut self, data: &[u8]) -> io::Result<()> {
344 if self.write(data)? == data.len() {
347 Err(Error::new(ErrorKind::WriteZero, "failed to write whole buffer"))
352 fn flush(&mut self) -> io::Result<()> {
357 /// Write is implemented for `Vec<u8>` by appending to the vector.
358 /// The vector will grow as needed.
359 #[stable(feature = "rust1", since = "1.0.0")]
360 impl Write for Vec<u8> {
362 fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
363 self.extend_from_slice(buf);
368 fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
369 let len = bufs.iter().map(|b| b.len()).sum();
372 self.extend_from_slice(buf);
378 fn is_write_vectored(&self) -> bool {
383 fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
384 self.extend_from_slice(buf);
389 fn flush(&mut self) -> io::Result<()> {