Struct ReadAtReader 

pub struct ReadAtReader<S> { /* private fields */ }

Adapt a positional source to Read and Seek with an independent cursor.

This is for synchronous parsers that already require standard I/O. It adds no buffering, prefetch, retry or asynchronous suspension. Wrap it in std::io::BufReader only when its extra reads fit the transport’s plan. Batched range requests remain available through ReadAt::read_many_at; a parser making individual Read calls cannot express such a batch here.

End-relative seeks call ReadAt::len, which can consume a sequential source to discover its length. Other seeks and Seek::stream_position do no I/O. Seeking past EOF is allowed. A failed read or seek leaves the logical cursor unchanged, but may have changed the source’s state or part of the read buffer. Whether retry is valid remains a source contract.

Native std::io::Error values (including StdSourceError::Io) are returned unchanged. Other errors retain their concrete value as an I/O payload, with an underlying I/O kind when present. zencodec::find_cause inspects these payloads as well as ordinary error chains.

Implementations

impl<S> ReadAtReader<S>

pub const fn new(source: S) -> Self

Take ownership of a source, starting the logical cursor at zero.

pub fn into_inner(self) -> S

Recover the source. The bridge retains no buffered bytes.

Trait Implementations

impl<S: Debug> Debug for ReadAtReader<S>

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

Formats the value using the given formatter.

impl<S: ReadAt> Read for ReadAtReader<S>

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

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<'_, u8>) -> 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<'_, u8>, ) -> 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.

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

where T: FromEndianBytes, Self: Sized,

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

Read and return a type (e.g. an integer) in little-endian order.

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

where T: FromEndianBytes, Self: Sized,

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

Read and return a type (e.g. an integer) in big-endian order.

impl<S: ReadAt> Seek for ReadAtReader<S>

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

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

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

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

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

Rewind to the beginning of a stream.

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

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

Returns the length of this stream (in bytes).

fn seek_relative(&mut self, offset: i64) -> Result<(), Error>

Seeks relative to the current position.