Trait olio::fs::PosRead

pub trait PosRead {
    fn pread(&self, buf: &mut [u8], offset: u64) -> Result<usize>;
}

Trait offering a uniform pread for positioned reads, with platform dependent side-effects.

For File (and any Borrow<File>), this is implemented using the platform dependent standard FileExt traits. To maintain portability and consistency on all platforms, the user is advised to avoid concurrent, direct reads or writes on a File (via its own Read/Write implementation) while any instances of this interface are in use for the same File, and to re-seek to a known file position after such use.

Required methods

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

Read bytes, starting at the specified offset, into the specified buffer and return the number of bytes read. The offset is from the start of the underlying file or file range. Reads beyond the end of available bytes will return 0 length. The position of the underlying file pointer (aka cursor) is not used. It is platform dependent whether the underlying file pointer is modified by this operation.

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Implementors

impl<B> PosRead for B where
    B: Borrow<File>, 

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

impl<P> PosRead for ReadPos<P> where
    P: PosRead, 

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

impl<P> PosRead for ReadSlice<P> where
    P: PosRead, 

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

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