pdfDAShiftedHeader

int32_t __stdcall pdfDAShiftedHeader(PPDF IPDF, int32_t FileHandle);

function pdfDAShiftedHeader(const IPDF: PPDF; FileHandle: Integer): Integer; stdcall;

Purpose. Per its name and ABI shape, this appears intended to detect or repair a PDF file whose %PDF- header is not at byte offset 0 (a "shifted header," e.g. because of a prepended email/HTTP wrapper) — paired with sibling digital-signature "usage rights" helpers in the same source group (pdfDARemoveUsageRights, not covered in this volume).

Description. Non-operational in this release. The entire implementation is if GapDoc(IPDF) = nil then Result := 0 else Result := 1 — it performs no file-header inspection, no shift detection, and no repair of any kind. FileHandle is accepted but never read. The return value communicates nothing beyond "was IPDF a valid document handle."

Parameters.

Return value. 1 if IPDF is valid; 0 otherwise. Carries no information about the target file's header state.

Remarks. Treat this as unimplemented despite its BOOL32-shaped success return; do not rely on it to detect or fix a shifted PDF header.

C# (P/Invoke)

public static extern int pdfDAShiftedHeader(IntPtr IPDF, int FileHandle);