The CRE->CFI converter works by text search / character-offset mapping
across the EPUB spine. Image-based fixed content (fixed-layout comic
EPUBs, PDFs, comic archives) has no extractable text, so the conversion
can never succeed and only wastes time parsing content docs while
logging a failed percentage-precision result.
Guard the conversion in the KOReader progress handler: when the matched
media item's FormatGroup is fixed_layout or comic_archive, skip
ConvertCREToStandard entirely. The incoming xpointer is left as-is so
KOReader<->KOReader restore via GotoXPointer still works; the web reader
restores by page index (the canonical locator for these formats).
This covers fixed-layout comic EPUBs in particular: KOReader routes all
EPUBs through CREngine (has_pages == false), so they send a real
xpointer that passes IsCREXPointer and would otherwise trigger the
doomed text extraction. Reflowable EPUBs (format_group == reflowable)
still run the conversion exactly as before.
john-okeefe
d11a623f9f