Struct io::ReaderWriter

pub struct ReaderWriter<IO> { /* private fields */ }

A readable and writable “stateful” I/O stream that keeps track of its current offset within its internal stateless I/O stream.

Trait implementations

• This implements the [core2::io::Read] and [core2::io::Write] traits for read and write access.
• This implements the [core2::io::Seek] trait if the underlying I/O stream implements KnownLength.
• This also forwards all other I/O-related traits implemented by the underlying I/O stream.
• This derefs into the inner IO type, via both Deref and DerefMut.

Implementations

impl<IO> ReaderWriter<IO>where IO: ByteReader + ByteWriter,

pub fn new(io: IO) -> ReaderWriter<IO>

Creates a new ReaderWriter with an initial offset of 0.

Trait Implementations

impl<IO> BlockIo for ReaderWriter<IO>where IO: BlockIo,

fn block_size(&self) -> usize

Returns the size in bytes of a single block (i.e., sector), the minimum granularity of I/O transfers.

impl<IO> BlockReader for ReaderWriter<IO>where IO: BlockReader,

fn read_blocks( &mut self, buffer: &mut [u8], block_offset: usize ) -> Result<usize, IoError>

Reads blocks of data from this reader into the given buffer.

impl<IO> BlockWriter for ReaderWriter<IO>where IO: BlockWriter,

fn write_blocks( &mut self, buffer: &[u8], block_offset: usize ) -> Result<usize, IoError>

Writes blocks of data from the given buffer to this writer.

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

Flushes this entire writer’s output stream, ensuring all contents in intermediate buffers are fully written out.

impl<IO> ByteReader for ReaderWriter<IO>where IO: ByteReader,

fn read_at( &mut self, buffer: &mut [u8], offset: usize ) -> Result<usize, IoError>

Reads bytes of data from this reader into the given buffer.

impl<IO> ByteWriter for ReaderWriter<IO>where IO: ByteWriter,

fn write_at(&mut self, buffer: &[u8], offset: usize) -> Result<usize, IoError>

Writes bytes of data from the given buffer to this writer.

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

Flushes this writer’s output stream, ensuring all contents in intermediate buffers are fully written out.

impl<IO> Deref for ReaderWriter<IO>

type Target = IO

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<IO> DerefMut for ReaderWriter<IO>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<IO> KnownLength for ReaderWriter<IO>where IO: KnownLength,

fn len(&self) -> usize

Returns the length (size in bytes) of this I/O stream or device.

impl<IO> Read for ReaderWriter<IO>where IO: ByteReader,

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

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

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

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

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

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

unsafe fn initializer(&self) -> Initializer

Determines if this Reader can work with buffers of uninitialized memory.

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

Read the exact number of bytes required to fill buf.

fn by_ref(&mut self) -> &mut Selfwhere Self: Sized,

Creates a “by reference” adaptor 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 adaptor which will chain this stream with another.

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

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

impl<IO> Seek for ReaderWriter<IO>where IO: KnownLength,

fn seek(&mut self, position: SeekFrom) -> Result<u64>

Seek to an offset, in bytes, in a stream.

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

Rewind to the beginning of a stream.

fn stream_len(&mut self) -> Result<u64, Error>

Returns the length of this stream (in bytes).

fn stream_position(&mut self) -> Result<u64, Error>

Returns the current seek position from the start of the stream.

impl<IO> Write for ReaderWriter<IO>where IO: ByteWriter,

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

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

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

Flush 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, fmt: Arguments<'_>) -> Result<(), Error>

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

fn by_ref(&mut self) -> &mut Selfwhere Self: Sized,

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