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Add FreeInkBook EPUB engine migration guide

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Document migration plan from CrossPoint's lib/Epub to FreeInkBook, a memory-efficient clean-room EPUB engine. Covers advantages (O(paragraph+page) memory via SAX parsing, arena allocation, host-testable, full UAX#14 typography, runtime TTF/OTF support), 9-step migration strategy, ESP32-C3 constraints, and integration approach preserving existing UI layer while replacing parsing/layout stack.
This commit is contained in:
Justin Mitchell
2026-07-08 00:22:21 -04:00
parent 5776911af0
commit 0848649ce2
49 changed files with 1065 additions and 15633 deletions
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lib/XmlParserUtils/XmlParserUtils.h
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#pragma once
#include <expat.h>
#include <epub/Expat.h> // FreeInkBook's vendored expat
// Safely tear down an expat parser: stop processing, clear callbacks, free, and null the pointer.
inline void destroyXmlParser(XML_Parser& parser) {