Struct io::Reader

pub struct Reader<R>(_);

A stateful reader that keeps track of its current offset within the internal stateless ByteReader I/O stream.

This implements the [core2::io::Read] trait for read-only access, as well as the [core2::io::Seek] trait if the underlying I/O stream implements KnownLength. It also forwards all other read-only I/O-related traits implemented by the underlying I/O stream.

Note: this is implemented as a thin wrapper around ReaderWriter.

Implementations

impl<R> Reader<R>where R: ByteReader,

pub fn new(reader: R) -> Reader<R>

Creates a new Reader with an initial offset of 0.

Trait Implementations

impl<IO> BlockIo for Reader<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 Reader<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> ByteReader for Reader<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> KnownLength for Reader<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 Reader<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 Reader<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.