# pdf_core
Low-level PDF parsing, object graph, stream handling, diagnostics, and resource-limit
enforcement.
Current stream decoding supports no-filter streams, `FlateDecode`,
`ASCIIHexDecode`, and `RunLengthDecode`. Unsupported filters and failed decodes
produce stable diagnostics while preserving raw bytes when possible.
Current page content resolution supports a single `/Contents` stream reference
or an ordered `/Contents [...]` array of stream references for controlled
vertical-slice fixtures, and exposes ordered content streams across all parsed
pages for CLI extraction.
Current tagged-PDF support parses simple `/StructTreeRoot` trees into
deterministic structure elements with structure type names, MCID references, and
controlled `/ParentTree` number-tree entries. Full parent-tree use in semantic
node construction remains later work.