Struct LoadFileDataBlock 

pub struct LoadFileDataBlock<'a> { /* private fields */ }

Streaming Load File Data Block. Stateful pull reader: each call to Self::next_block writes the next chunk into the caller’s buffer, so the whole block never resides in RAM at once.

Implementations

impl LoadFileDataBlock<'_>

pub fn len(&self) -> usize

Total LFDB byte length (sum of the §C.2-ordered components, decompressed). Needed for the 'C4' tag length and to derive block_count. Total framed LFDB byte length streamed to LOAD: the 'C4' tag+length header plus the §C.2-ordered component content. This is what the LOAD loop counts for last-block detection and block_count.

pub fn content_len(&self) -> usize

Content length only — the value of the 'C4' TLV (sum of the §C.2 components, decompressed), excluding the header. This is the length encoded in the 'C4' header and the input over which a Load File Data Block Hash (Lh) would be computed (GPCS v2.3.1 §11.6.2.3) — not the framed stream.

pub fn is_empty(&self) -> bool

true if there is no component content (degenerate / malformed CAP).

pub fn next_block( &mut self, infl: &mut InflateCtx, out: &mut [u8], ) -> Result<usize, CapError>

Write the next LFDB chunk into out (should be LOAD_BLOCK_DATA long) and return the byte count written. Returns Ok(0) once the block is exhausted. STORED components are copied from the borrowed input; DEFLATE components are inflated through infl (the 32 KiB window doubles as the wrapping dictionary). A chunk may straddle component boundaries (the LFDB is the concatenation in GPCS §C.2 order), so bytes are assembled into out.

Errors

Returns CapError::Inflate if a DEFLATE component cannot be decompressed (corrupt stream, or the input/window bound was exceeded).

pub fn reset(&mut self)

Restart from the first byte (e.g. to hash the LFDB, then re-stream it to LOAD without re-parsing the ZIP). Caller should also infl.reset().