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fix(c2pa): drop non-printable claim_generator garbage

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On some manifests (observed: Microsoft Designer) the first CBOR "name"
key precedes a binary hash field, not the generator string, so
_cbor_text_after returns control-char garbage. Guard with isprintable()
to drop it; issuer detection (byte-search) and the SynthID verdict are
unaffected. Adds TestParseChunkGuards covering kept-vs-dropped cases.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
test-user
2026-05-24 15:55:07 -07:00
co-authored by Claude Opus 4.7
parent da0edcbddc
commit 6cef1d59f0
2 changed files with 32 additions and 2 deletions
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src/remove_ai_watermarks/noai/c2pa.py
+5 -2
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@@ -196,9 +196,12 @@ def _parse_c2pa_chunk(chunk_data: bytes, c2pa_info: dict[str, Any]) -> None:
# Claim generator and spec version: read the CBOR text-string values
# directly (regex byte-grabbing produced artifacts like ``fGPT-4o``).
if generator := _cbor_text_after(chunk_data, b"name"):
# Guard with isprintable(): on some manifests (e.g. Microsoft Designer) the
# first ``name`` key precedes a binary field (a hash), not the generator
# string, which would otherwise surface as control-char garbage.
if (generator := _cbor_text_after(chunk_data, b"name")) and generator.isprintable():
c2pa_info["claim_generator"] = generator
if spec := _cbor_text_after(chunk_data, b"specVersion"):
if (spec := _cbor_text_after(chunk_data, b"specVersion")) and spec.isprintable():
c2pa_info["c2pa_spec"] = spec
# Find actions