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Victor Kuznetsov
d5845a72f3
Closes a documented coverage gap (P2#9): an AI Software/Make/Artist/ImageDescription token in an EXIF item (its TIFF bytes live in mdat/idat) survived remove_ai_metadata because the top-level box stripper and (absent pillow-heif) the PIL EXIF reader can't reach it. New isobmff.blank_ai_exif_tokens finds EXIF TIFF blocks by their II/MM byte-order header, validates each with piexif (a coincidental II/MM run in pixels won't parse as a TIFF IFD, so it's ignored), and overwrites any AI_GENERATOR_TOKENS- bearing value with same-length spaces -- so box sizes and iloc offsets stay valid and the coded image is untouched (mirrors blank_ai_xmp_packets; no iinf/iloc surgery, no exiftool dep). Camera/editor EXIF without an AI token is preserved. Wired into remove_ai_metadata's ISOBMFF path. Covers the realistic AI-generator-token case; xAI- signature-in-meta-box-EXIF (Grok is JPEG-only) stays out. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>