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Handle nested navpoint elements in nxc TOC

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Dave Allie 2025-12-03 22:30:50 +11:00
parent 4186c7da9e
commit 7704772ebe
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2 changed files with 22 additions and 23 deletions
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33
lib/Epub/Epub.cpp
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@ -3,7 +3,6 @@
#include <HardwareSerial.h>
#include <SD.h>
#include <ZipFile.h>
#include <tinyxml2.h>
#include <map>
@ -162,14 +161,14 @@ bool Epub::parseContentOpf(ZipFile& zip, std::string& content_opf_file) {
return true;
}
bool Epub::parseTocNcxFile(ZipFile& zip) {
bool Epub::parseTocNcxFile(const ZipFile& zip) {
// the ncx file should have been specified in the content.opf file
if (tocNcxItem.empty()) {
Serial.println("No ncx file specified");
return false;
}
auto ncxData = zip.readTextFileToMemory(tocNcxItem.c_str());
const auto ncxData = zip.readTextFileToMemory(tocNcxItem.c_str());
if (!ncxData) {
Serial.printf("Could not find %s\n", tocNcxItem.c_str());
return false;
@ -177,7 +176,7 @@ bool Epub::parseTocNcxFile(ZipFile& zip) {
// Parse the Toc contents
tinyxml2::XMLDocument doc;
auto result = doc.Parse(ncxData);
const auto result = doc.Parse(ncxData);
free(ncxData);
if (result != tinyxml2::XML_SUCCESS) {
@ -185,27 +184,30 @@ bool Epub::parseTocNcxFile(ZipFile& zip) {
return false;
}
auto ncx = doc.FirstChildElement("ncx");
const auto ncx = doc.FirstChildElement("ncx");
if (!ncx) {
Serial.println("Could not find first child ncx in toc");
return false;
}
auto navMap = ncx->FirstChildElement("navMap");
const auto navMap = ncx->FirstChildElement("navMap");
if (!navMap) {
Serial.println("Could not find navMap child in ncx");
return false;
}
auto navPoint = navMap->FirstChildElement("navPoint");
recursivelyParseNavMap(navMap->FirstChildElement("navPoint"));
return true;
}
void Epub::recursivelyParseNavMap(tinyxml2::XMLElement* element) {
// Fills toc map
while (navPoint) {
std::string navTitle = navPoint->FirstChildElement("navLabel")->FirstChildElement("text")->FirstChild()->Value();
auto content = navPoint->FirstChildElement("content");
while (element) {
std::string navTitle = element->FirstChildElement("navLabel")->FirstChildElement("text")->FirstChild()->Value();
const auto content = element->FirstChildElement("content");
std::string href = contentBasePath + content->Attribute("src");
// split the href on the # to get the href and the anchor
size_t pos = href.find('#');
const size_t pos = href.find('#');
std::string anchor;
if (pos != std::string::npos) {
@ -214,10 +216,13 @@ bool Epub::parseTocNcxFile(ZipFile& zip) {
}
toc.emplace_back(navTitle, href, anchor, 0);
navPoint = navPoint->NextSiblingElement("navPoint");
}
return true;
tinyxml2::XMLElement* nestedNavPoint = element->FirstChildElement("navPoint");
if (nestedNavPoint) {
recursivelyParseNavMap(nestedNavPoint);
}
element = element->NextSiblingElement("navPoint");
}
}
// load in the meta data for the epub file

12
lib/Epub/Epub.h
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@ -1,5 +1,6 @@
#pragma once
#include <HardwareSerial.h>
#include <tinyxml2.h>
#include <string>
#include <unordered_map>
@ -38,36 +39,29 @@ class Epub {
// find the path for the content.opf file
static bool findContentOpfFile(const ZipFile& zip, std::string& contentOpfFile);
bool parseContentOpf(ZipFile& zip, std::string& content_opf_file);
bool parseTocNcxFile(ZipFile& zip);
bool parseTocNcxFile(const ZipFile& zip);
void recursivelyParseNavMap(tinyxml2::XMLElement* element);
public:
explicit Epub(std::string filepath, const std::string& cacheDir) : filepath(std::move(filepath)) {
// create a cache key based on the filepath
cachePath = cacheDir + "/epub_" + std::to_string(std::hash<std::string>{}(this->filepath));
}
~Epub() = default;
std::string& getBasePath() { return contentBasePath; }
bool load();
void clearCache() const;
void setupCacheDir() const;
const std::string& getCachePath() const;
const std::string& getPath() const;
const std::string& getTitle() const;
const std::string& getCoverImageItem() const;
uint8_t* getItemContents(const std::string& itemHref, size_t* size = nullptr) const;
char* getTextItemContents(const std::string& itemHref, size_t* size = nullptr) const;
std::string& getSpineItem(int spineIndex);
int getSpineItemsCount() const;
EpubTocEntry& getTocItem(int tocTndex);
int getTocItemsCount() const;
// work out the section index for a toc index
int getSpineIndexForTocIndex(int tocIndex) const;
int getTocIndexForSpineIndex(int spineIndex) const;
};