Struct AsyncFile

pub struct AsyncFile { /* private fields */ }

Wraps a fidl_fuchsia_io::FileProxy and implements AsyncReadAt and AsyncGetSize, which allows one to perform asynchronous file reads that don’t block the current thread while waiting for data. Unlike AsyncReader, this struct does not require exclusive ownership, because read_at does not rely on the file offset state in the connection. This is useful if one wants to efficiently read different parts of the file at the same time.

Implementations

impl AsyncFile

pub fn from_proxy(file: FileProxy) -> Self

Trait Implementations

impl AsyncGetSize for AsyncFile

fn poll_get_size( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<u64>>

Attempt to get the size of the file, on success returns the file size.

impl AsyncReadAt for AsyncFile

fn poll_read_at( self: Pin<&mut Self>, cx: &mut Context<'_>, offset: u64, buf: &mut [u8], ) -> Poll<Result<usize>>

Attempt to read at most buf.len() bytes starting at offset into buf. On success returns the number of bytes read. Contents of buf are only altered on success. Reads of more than zero but fewer than buf.len() bytes do NOT indicate EOF. Reads of zero bytes only occur if buf.len() == 0 or EOF.

impl Debug for AsyncFile

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

Formats the value using the given formatter.