Struct io::Reader

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pub struct Reader<R>(/* private fields */);
Expand description

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.

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

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

Creates a new Reader with an initial offset of 0.

Trait Implementations§

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

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fn block_size(&self) -> usize

Returns the size in bytes of a single block (i.e., sector), the minimum granularity of I/O transfers.
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impl<IO> BlockReader for Reader<IO>where IO: BlockReader,

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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. Read more
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impl<IO> ByteReader for Reader<IO>where IO: ByteReader,

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

Reads bytes of data from this reader into the given buffer. Read more
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impl<IO> KnownLength for Reader<IO>where IO: KnownLength,

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fn len(&self) -> usize

Returns the length (size in bytes) of this I/O stream or device.
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impl<IO> Read for Reader<IO>where IO: ByteReader,

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

Read all bytes until EOF in this source, appending them to buf. Read more
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unsafe fn initializer(&self) -> Initializer

Determines if this Reader can work with buffers of uninitialized memory. Read more
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fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>

Read the exact number of bytes required to fill buf. Read more
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fn by_ref(&mut self) -> &mut Selfwhere Self: Sized,

Creates a “by reference” adaptor for this instance of Read. Read more
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fn bytes(self) -> Bytes<Self>where Self: Sized,

Transforms this Read instance to an Iterator over its bytes. Read more
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fn chain<R>(self, next: R) -> Chain<Self, R>where R: Read, Self: Sized,

Creates an adaptor which will chain this stream with another. Read more
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fn take(self, limit: u64) -> Take<Self>where Self: Sized,

Creates an adaptor which will read at most limit bytes from it. Read more
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impl<IO> Seek for Reader<IO>where IO: KnownLength,

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

Seek to an offset, in bytes, in a stream. Read more
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fn rewind(&mut self) -> Result<(), Error>

Rewind to the beginning of a stream. Read more
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fn stream_len(&mut self) -> Result<u64, Error>

Returns the length of this stream (in bytes). Read more
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fn stream_position(&mut self) -> Result<u64, Error>

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

Auto Trait Implementations§

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impl<R> RefUnwindSafe for Reader<R>where R: RefUnwindSafe,

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impl<R> Send for Reader<R>where R: Send,

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impl<R> Sync for Reader<R>where R: Sync,

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impl<R> Unpin for Reader<R>where R: Unpin,

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impl<R> UnwindSafe for Reader<R>where R: UnwindSafe,

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.