Struct UnfilterBuf

pub struct UnfilterBuf<'data> { /* private fields */ }

An inplace buffer for decompression and filtering of PNG rowlines.

The underlying data structure is a vector, with additional markers denoting a region of bytes that are utilized by the decompression but not yet available to arbitrary modifications. The caller can still shift around data between calls to the stream decompressor as long as the data in the marked region is not modified and the indices adjusted accordingly. See UnfilterRegion that contains these markers.

Violating the invariants, i.e. modifying bytes in the marked region, results in absurdly wacky decompression output or panics but not undefined behavior.