0332e1103a
## Summary * **What is the goal of this PR?** Add EPUB 3 support by implementing native navigation document (nav.xhtml) parsing with NCX fallback, addressing issue Fixes: #143. * **What changes are included?** - New `TocNavParser` for parsing EPUB 3 HTML5 navigation documents (`<nav epub:type="toc">`) - Detection of nav documents via `properties="nav"` attribute in OPF manifest - Fallback logic: try EPUB 3 nav first, fall back to NCX (EPUB 2) if unavailable - Graceful degradation: books without any TOC now load with a warning instead of failing ## Additional Context * The implementation follows the existing streaming XML parser pattern using Expat to minimize RAM usage on the ESP32-C3 * EPUB 3 books that include both nav.xhtml and toc.ncx will prefer the nav document (per EPUB 3 spec recommendation) * No breaking changes - existing EPUB 2 books continue to work as before * Tested on examples from https://idpf.github.io/epub3-samples/30/samples.html
65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
#pragma once
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#include <Print.h>
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#include <memory>
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#include <string>
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#include <unordered_map>
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#include <vector>
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#include "Epub/BookMetadataCache.h"
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class ZipFile;
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class Epub {
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// the ncx file (EPUB 2)
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std::string tocNcxItem;
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// the nav file (EPUB 3)
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std::string tocNavItem;
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// where is the EPUBfile?
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std::string filepath;
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// the base path for items in the EPUB file
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std::string contentBasePath;
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// Uniq cache key based on filepath
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std::string cachePath;
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// Spine and TOC cache
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std::unique_ptr<BookMetadataCache> bookMetadataCache;
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bool findContentOpfFile(std::string* contentOpfFile) const;
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bool parseContentOpf(BookMetadataCache::BookMetadata& bookMetadata);
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bool parseTocNcxFile() const;
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bool parseTocNavFile() const;
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public:
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explicit Epub(std::string filepath, const std::string& cacheDir) : filepath(std::move(filepath)) {
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// create a cache key based on the filepath
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cachePath = cacheDir + "/epub_" + std::to_string(std::hash<std::string>{}(this->filepath));
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}
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~Epub() = default;
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std::string& getBasePath() { return contentBasePath; }
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bool load(bool buildIfMissing = true);
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bool clearCache() const;
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void setupCacheDir() const;
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const std::string& getCachePath() const;
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const std::string& getPath() const;
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const std::string& getTitle() const;
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const std::string& getAuthor() const;
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std::string getCoverBmpPath() const;
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bool generateCoverBmp() const;
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uint8_t* readItemContentsToBytes(const std::string& itemHref, size_t* size = nullptr,
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bool trailingNullByte = false) const;
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bool readItemContentsToStream(const std::string& itemHref, Print& out, size_t chunkSize) const;
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bool getItemSize(const std::string& itemHref, size_t* size) const;
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BookMetadataCache::SpineEntry getSpineItem(int spineIndex) const;
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BookMetadataCache::TocEntry getTocItem(int tocIndex) const;
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int getSpineItemsCount() const;
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int getTocItemsCount() const;
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int getSpineIndexForTocIndex(int tocIndex) const;
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int getTocIndexForSpineIndex(int spineIndex) const;
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size_t getCumulativeSpineItemSize(int spineIndex) const;
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int getSpineIndexForTextReference() const;
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size_t getBookSize() const;
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uint8_t calculateProgress(int currentSpineIndex, float currentSpineRead) const;
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};
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