Struct axmem::MemBackend

pub struct MemBackend { /* private fields */ }

File backend for Lazy load MapArea. file should be a file holding a offset value. Normally, MemBackend won’t share a file with other things, so we use a Box here.

Implementations

impl MemBackend

pub fn new(file: Box<dyn FileExt>, offset: u64) -> Self

Create a new MemBackend with a file and the seek offset of this file.

pub fn clone_with_delta(&self, delta: i64) -> Self

clone a new MemBackend with a delta offset of the file of the original MemBackend.

pub fn read_from_seek( &mut self, pos: SeekFrom, buf: &mut [u8] ) -> Result<usize, Error>

read from the file of the MemBackend with a pos offset.

pub fn write_to_seek( &mut self, pos: SeekFrom, buf: &[u8] ) -> Result<usize, Error>

write to the file of the MemBackend with a pos offset.

pub fn readable(&self) -> bool

whether the file of the MemBackend is readable.

pub fn writable(&self) -> bool

whether the file of the MemBackend is writable.

Trait Implementations

impl Clone for MemBackend

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Read for MemBackend

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>) -> Result<usize, AxError>

Read all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, buf: &mut String) -> Result<usize, AxError>

Read all bytes until EOF in this source, appending them to buf.

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

Read the exact number of bytes required to fill buf.

fn read_full(&mut self, buf: &mut [u8]) -> Result<usize, AxError>

Read the exact number of bytes required to fill buf.

impl Seek for MemBackend

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

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

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

Rewind to the beginning of a stream.

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

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