Struct SeekPoolSource 

pub struct SeekPoolSource<R: Read + Seek + Send> { /* private fields */ }

Wrap one or more legacy Read + Seek readers as an ImageSource. A read_at checks out a free cursor from the pool (blocking on one if all are busy), so parallel reads scale up to the pool size instead of serializing on a single lock. A single-reader pool is a plain mutex. This is how a container decoder (VHD/VMDK/QCOW2) hands its Read + Seek reader back as a DynSource.

Implementations

impl<R: Read + Seek + Send> SeekPoolSource<R>

pub fn new(readers: Vec<R>, len: u64) -> Self

A pool of independent cursors over the same len-byte stream.

pub fn single(reader: R, len: u64) -> Self

A single-cursor pool (a plain mutex).

Trait Implementations

impl<R: Read + Seek + Send> ImageSource for SeekPoolSource<R>

fn len(&self) -> u64

Logical size in bytes of this stream.

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

Fill buf starting at byte offset. Returns bytes read (0 at/after EOF). Never panics; a short read past EOF returns the available prefix length.

fn is_empty(&self) -> bool

True when the stream is zero-length.

fn extents(&self) -> Extents

Allocated-extent map. Default = one dense extent covering [0, len).

fn view(&self, offset: u64, len: usize) -> Option<SourceView<'_>>

Optional zero-copy fast path. None when the backing cannot lend a contiguous view (the caller then uses ImageSource::read_at).

fn source_id(&self) -> SourceId

Stable identity for cache keying and lineage.