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M1: read an xref table numbered from 1 that begins with object 0 (#2676)

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Some producers head a classic xref table "1 n" and then write object 0's
free entry first, so every row is one number off and object 1 reads as
free. The renderer coped, but cos did not: printing a scanned invoice
built from cos dropped object 1 (page 1's image) and printed the page
blank. Such a subsection is now read from 0 when its second row locates
an object that is numbered 1, in both xref readers, and the repair is
logged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RUNQSPVXx3dDBabRZHAnjz
This commit is contained in:
mtlcl410
2026-10-16 08:35:35 +08:00
co-authored by Claude Opus 5.5
parent 99941daa5a
commit 271cb6161f
2 changed files with 176 additions and 8 deletions
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parity/acrobat-features.toml
+2 -2
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@@ -46,8 +46,8 @@ milestone = "M1"
status = "shipped"
commands = ["file.open"]
tools = ["doc_open"]
evidence = ["crates/cos/src/document.rs::damaged_xref_is_reconstructed", "crates/cos/src/parser.rs::indirect_stream_with_wrong_length_recovers", "crates/cos/src/document.rs::self_referential_length_does_not_overflow"]
notes = ""
evidence = ["crates/cos/src/document.rs::damaged_xref_is_reconstructed", "crates/cos/src/parser.rs::indirect_stream_with_wrong_length_recovers", "crates/cos/src/document.rs::self_referential_length_does_not_overflow", "crates/cos/src/document.rs::a_table_numbered_from_1_that_begins_with_object_0_is_read_from_0"]
notes = "A classic table numbered 1 n that begins with object 0's free entry is read from 0 (#2676) and logged."
[[feature]]
id = "core.malformed-input-safety"