Struct risc0_zkvm::guest::env::FdReader

pub struct FdReader { /* private fields */ }

Provides a FdReader which can read from any file descriptor

Implementations

impl FdReader

pub fn new(fd: u32) -> FdReader

Creates a new FdReader reading from the given file descriptor.

Trait Implementations

impl Read for FdReader

fn read<T: DeserializeOwned>(&mut self) -> T

Read data from the host.

fn read_slice<T: Pod>(&mut self, buf: &mut [T])

Read raw data from the host.

impl Read for FdReader

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_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>

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.

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

Read 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)

Read the exact number of bytes required to fill cursor.

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

where 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 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.

impl WordRead for FdReader

fn read_words(&mut self, words: &mut [u32]) -> Result<()>

Fill the given buffer with words from input. Returns an error if EOF was encountered.

fn read_padded_bytes(&mut self, bytes: &mut [u8]) -> Result<()>

Fill the given buffer with bytes from input, and discard the padding up to the next word boundary. Returns an error if EOF was encountered.