Struct SubRange 

pub struct SubRange { /* private fields */ }

A byte window [base, base+len) of a parent source, itself an ImageSource. How a partition, VSS store, embedded image, or decrypted volume is addressed. len is clamped to the parent’s bounds at construction, so a read_at can never escape the window.

Implementations

impl SubRange

pub fn new(parent: DynSource, base: u64, len: u64) -> Self

A window starting at base in parent, at most len bytes, clamped to whatever the parent actually has from base.

Trait Implementations

impl ImageSource for SubRange

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 source_id(&self) -> SourceId

Stable identity for cache keying and lineage.

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).