Struct OverlayBase 

pub struct OverlayBase {
    pub prev: u64,
    pub kind: XrefStyle,
    pub size: u32,
    pub root: ObjRef,
    pub info: Option<ObjRef>,
    pub id: Option<Object>,
}

The facts about a base document an update needs, read once from its trailer and its own newest cross-reference section: refuses an encrypted base or one missing /Root or a startxref to chain from.

Fields

prev: u64

Byte offset of the base’s own newest cross-reference section, named as the appended section’s /Prev.

kind: XrefStyle

Style of that newest section, read from the section itself rather than the merged trailer (a hybrid base’s merged trailer carries /Type /XRef inherited from its /XRefStm, even though its newest section, per startxref, is the classic table).

size: u32

The next free object number: the base’s declared /Size, raised to one past its highest addressed object number.

root: ObjRef

The base’s catalog.

info: Option<ObjRef>

The base’s document information dictionary, when present.

id: Option<Object>

The base trailer’s /ID array, cloned.

Implementations

impl OverlayBase

pub fn from_document(doc: &Document) -> Result<OverlayBase>

Reads doc’s trailer and newest cross-reference section: the section’s offset and kind come from doc.xref().newest_section(), already recorded while core loaded the file, falling back to re-deriving them from startxref and parse_section_at when the document has none (a recovery-scan base refuses with Error::MissingStartxref on this fallback path). Refuses any encrypted doc outright, wider than crate::importer::Importer::new’s own locked-only refusal: appending onto an already-encrypted base is a feature this crate does not yet implement, so every encrypted base is refused here for now, password-opened or not.

Trait Implementations

impl Clone for OverlayBase

fn clone(&self) -> OverlayBase

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for OverlayBase

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.