bookmeta: Cover::guessed says the file left the choice open — a Kindle
book's first image record, or an EPUB image picked because its name says
cover — so a caller with a register to ask can prefer that. A cover the
file names is never a guess. Cover::extension matches bibfetch's.
bibfetch: Open Library answers 403 to more than a hundred covers by ISBN
in five minutes from one address. That is now Error::Limited, not
Unreachable: the other form of the ISBN is not asked, the cover id still
is, since those are not limited, and the CLI exits 75. Covers asked by
ISBN are kept three seconds apart across the process (Covers::pace), which
stays under the limit however long a run goes. A deadline too long to add
to the clock no longer panics; it is no deadline.
bindings: fetch_cover and search_title for Python, and catena.Limited,
which fetch_identifier raises too when a register refuses for being asked
too often.
corpus-core: exit 75, a service refused for now.
EXTH 113 is an ASIN only when it is ten letters and digits; a UUID goes
under uuid, as the EPUB reader files it, and anything else under other.
With no EXTH 201 or 202, the first record from the first image index that
is a JPEG, PNG or GIF is the cover, stopping at the KF8 boundary (EXTH 121).
A Kindle book's title, authors, publisher, description, ISBN, ASIN,
subjects, date and language come from the EXTH block, with the full name,
the Palm database name and the header's locale as fallbacks. The cover
image (EXTH 201, or the thumbnail) is returned as Metadata::cover with its
media type; it stays out of the JSON record. Every offset is bounds-checked:
a damaged header gives an empty record with a note, a broken EXTH block
keeps what came before the break, and an encrypted book is still read and
noted as drm.
Metadata gains description, which the EPUB reader now fills from
dc:description as well.
Fixtures are a story and cover written for the tests (CC0), converted with
calibre to MOBI 6 and AZW3, plus no-EXTH, DRM-flagged and truncated copies.
funkpower