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Huang Xin e9c5ebb696 fix(fonts): fix Adobe font deobfuscation and CSS var fallbacks, closes #3662 (#3696)
Two issues caused embedded EPUB fonts to fail:

1. Adobe font deobfuscation (http://ns.adobe.com/pdf/enc#RC) derived the
   XOR key from the wrong UUID. getUUID() picked the first UUID across all
   dc:identifier elements (e.g. Calibre's internal UUID) instead of the
   book's unique-identifier. Also fixed getElementById not working on
   DOMParser-parsed XML (no DTD), and made UUID regex case-insensitive.

2. transformStylesheet replaced generic font families (sans-serif, serif,
   monospace) with CSS var() references without fallback values. In
   fixed-layout iframes where setStyles doesn't inject the variables,
   the undefined var() invalidated the entire font-family declaration
   per CSS spec, causing all fonts to fall back to system defaults.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-30 19:06:22 +02:00
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