missing-header

All codes

• Type: warning
• Kind: input (the input is malformed beyond what tolerance repairs)

What happened

No %PDF-x.y header was found in the first 1,024 bytes; parsing went ahead.

Why

Files are often truncated at the front or prefixed with other data.

How to fix

Nothing, if the document reads correctly. Open in strict mode to refuse such files, or strip whatever precedes %PDF before opening.

Example

offset 0      From: mailer@example.org
              …(1,200 bytes of mail headers and a MIME boundary)…
offset 1,212  %PDF-1.7
              1 0 obj << /Type /Catalog /Pages 2 0 R >> endobj

lamina looks for %PDF- in the first 1,024 bytes only. Here it starts at byte 1,212, so Document::open_bytes warns missing-header and reads the objects anyway. With OpenOptions::default().with_strict(true) the same open fails with strict.

Data fields

None.