Struct read_write_at::ReadWriteSeek

pub struct ReadWriteSeek<T: Seek>(pub T);

A wrapper that calls Seek::seek and Read::read or Write::write for each call of read_at or write_at Can be used for read-only access as well.

Example:

use read_write_at::{ReadWriteSeek,ReadAtMut};
 
let v = vec![3u8, 4,5,6];
let c = std::io::Cursor::new(v);
let mut rws = ReadWriteSeek(c);
 
let mut v2 = vec![0,0];
rws.read_exact_at(&mut v2[..], 1).unwrap();
assert_eq!(v2, vec![4,5]);

Trait Implementations

impl<T: Read + Seek> ReadAtMut for ReadWriteSeek<T>

fn read_at(&mut self, buf: &mut [u8], offset: u64) -> Result<usize>

Similar to ReadAt::read_at, but it is allowed to change object internal state.

fn read_exact_at(&mut self, buf: &mut [u8], offset: u64) -> Result<()>

Similar to read_at, but without short reads.

impl<T: Write + Seek> WriteAtMut for ReadWriteSeek<T>

fn write_at(&mut self, buf: &[u8], offset: u64) -> Result<usize>

Writes a number of bytes starting from a given offset. Returns the number of bytes written. The offset is relative to the start of the (virtual) file and thus independent from the current cursor, if the object has concept of a cursor. That cursor then should not be affected by this function. Short writes are not considered as errors.

fn write_all_at(&mut self, buf: &[u8], offset: u64) -> Result<()>

Similar to write_at, but without short writes. if entirety of the provided buffer cannot be written, an error is returned.