Struct PrefixedIo 

pub struct PrefixedIo<P, S> { /* private fields */ }

a stream which has some data prefixed to be read first prior to any other reading.

The source of that prefix data is often the result of data which was “peeked” from the inner I/O, although that is not required.

It’s similar to ChainReader, except that writing is also supported and happening directly in function of the inner stream.

Implementations

impl<P, S> PrefixedIo<P, S>

pub fn new(prefix: P, inner: S) -> PrefixedIo<P, S>

Create a new PrefixedIo for the given prefix [AsyncRead] and inner Io which implements ExtensionsMut.

Trait Implementations

impl<P, S> AsyncBufRead for PrefixedIo<P, S>

where P: AsyncBufRead, S: AsyncBufRead,

fn poll_fill_buf( self: Pin<&mut PrefixedIo<P, S>>, cx: &mut Context<'_>, ) -> Poll<Result<&[u8], Error>>

Attempts to return the contents of the internal buffer, filling it with more data from the inner reader if it is empty.

fn consume(self: Pin<&mut PrefixedIo<P, S>>, amt: usize)

Tells this buffer that amt bytes have been consumed from the buffer, so they should no longer be returned in calls to poll_read.

impl<P, S> AsyncRead for PrefixedIo<P, S>

where P: AsyncRead, S: AsyncRead,

fn poll_read( self: Pin<&mut PrefixedIo<P, S>>, cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll<Result<(), Error>>

Attempts to read from the AsyncRead into buf.

impl<P, S> AsyncWrite for PrefixedIo<P, S>

where S: AsyncWrite,

fn poll_write( self: Pin<&mut PrefixedIo<P, S>>, cx: &mut Context<'_>, buf: &[u8], ) -> Poll<Result<usize, Error>>

Attempt to write bytes from buf into the object.

fn poll_flush( self: Pin<&mut PrefixedIo<P, S>>, cx: &mut Context<'_>, ) -> Poll<Result<(), Error>>

Attempts to flush the object, ensuring that any buffered data reach their destination.

fn poll_shutdown( self: Pin<&mut PrefixedIo<P, S>>, cx: &mut Context<'_>, ) -> Poll<Result<(), Error>>

Initiates or attempts to shut down this writer, returning success when the I/O connection has completely shut down.

fn poll_write_vectored( self: Pin<&mut PrefixedIo<P, S>>, cx: &mut Context<'_>, bufs: &[IoSlice<'_>], ) -> Poll<Result<usize, Error>>

Like poll_write, except that it writes from a slice of buffers.

fn is_write_vectored(&self) -> bool

Determines if this writer has an efficient poll_write_vectored implementation.

impl<P, S> Clone for PrefixedIo<P, S>

where P: Clone, S: Clone,

fn clone(&self) -> PrefixedIo<P, S>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<P, S> Debug for PrefixedIo<P, S>

where P: Debug, S: Debug,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<P, S> ExtensionsMut for PrefixedIo<P, S>

where S: ExtensionsMut,

fn extensions_mut(&mut self) -> &mut Extensions

Get mutable reference to the underlying Extensions store

impl<P, S> ExtensionsRef for PrefixedIo<P, S>

where S: ExtensionsRef,

fn extensions(&self) -> &Extensions

Get reference to the underlying Extensions store

impl<P, S> Read for PrefixedIo<P, S>

where P: Read, S: Read,

fn read(&mut self, buf: &mut [u8]) -> Result<usize, Error>

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> Result<usize, Error>

Like read, except that it reads into a slice of buffers.

fn is_read_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Reader has an efficient read_vectored implementation.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>

Reads all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>

Reads all bytes until EOF in this source, appending them to buf.

fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>

Reads the exact number of bytes required to fill buf.

fn read_buf(&mut self, buf: BorrowedCursor<'_>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Pull some bytes from this source into the specified buffer.

fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Reads the exact number of bytes required to fill cursor.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Read.

fn bytes(self) -> Bytes<Self>

where Self: Sized,

Transforms this Read instance to an Iterator over its bytes.

fn chain<R>(self, next: R) -> Chain<Self, R>

where R: Read, Self: Sized,

Creates an adapter which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>

where Self: Sized,

Creates an adapter which will read at most limit bytes from it.

fn read_array<const N: usize>(&mut self) -> Result<[u8; N], Error>

where Self: Sized,

🔬This is a nightly-only experimental API. (read_array)

Read and return a fixed array of bytes from this source.

impl<P, S> Write for PrefixedIo<P, S>

where S: Write,

fn write(&mut self, buf: &[u8]) -> Result<usize, Error>

Writes a buffer into this writer, returning how many bytes were written.

fn flush(&mut self) -> Result<(), Error>

Flushes this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

fn write_fmt(&mut self, args: Arguments<'_>) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize, Error>

Like write, except that it writes from a slice of buffers.

fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

🔬This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Write.

impl<'__pin, P, S> Unpin for PrefixedIo<P, S>

where <PinnedFieldsOfHelperStruct<__Origin<'__pin, P, S>> as PinnedFieldsOfHelperTrait>::Actual: Unpin,