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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.
Fixtures
MOBI and AZW3
lantern.html is a two-paragraph story written for these tests, and
lantern-cover.jpg a 120×180 cover drawn for them with Pillow. Both are
dedicated to the public domain (CC0 1.0), and so is everything made from them.
lantern.mobi (MOBI 6) and lantern.azw3 (KF8) were made from them with
calibre 9.14:
common=(--title "A Lantern in the Orchard" --authors "Ada Quill & Tomás Reed"
--publisher "Orchard Press" --isbn 9780306406157 --tags "Fiction,Villages"
--language en --pubdate 2001-04-05 --comments "A short story written for testing."
--cover lantern-cover.jpg)
ebook-convert lantern.html lantern.mobi --mobi-file-type old "${common[@]}"
ebook-convert lantern.html lantern.azw3 "${common[@]}"
The other three are lantern.mobi with one thing broken. r0 is the first
record's offset, the big-endian 32-bit number at byte 78 (136 here).
| File | Change |
|---|---|
lantern-no-exth.mobi |
The EXTH flag (0x40) cleared in the MOBI header's flags, at r0 + 16 + 112 |
lantern-drm.mobi |
The PalmDOC encryption type, at r0 + 12, set to 2 |
lantern-truncated.mobi |
The first 1024 bytes only |