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A fork of https://github.com/crosspoint-reader/crosspoint-reader
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30 kB · 888 lines
C++
at master
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#include <FsHelpers.h>#include <HalStorage.h>#include <JpegToBmpConverter.h>#include <Logging.h>#include <PngToBmpConverter.h>#include <ZipFile.h>
#include "Epub/parsers/ContainerParser.h"#include "Epub/parsers/ContentOpfParser.h"#include "Epub/parsers/TocNavParser.h"#include "Epub/parsers/TocNcxParser.h"
bool Epub::findContentOpfFile(std::string* contentOpfFile) const { const auto containerPath = "META-INF/container.xml"; size_t containerSize;
// Get file size without loading it all into heap if (!getItemSize(containerPath, &containerSize)) { LOG_ERR("EBP", "Could not find or size META-INF/container.xml"); return false; }
ContainerParser containerParser(containerSize);
if (!containerParser.setup()) { return false; }
// Stream read (reusing your existing stream logic) if (!readItemContentsToStream(containerPath, containerParser, 512)) { LOG_ERR("EBP", "Could not read META-INF/container.xml"); return false; }
// Extract the result if (containerParser.fullPath.empty()) { LOG_ERR("EBP", "Could not find valid rootfile in container.xml"); return false; }
*contentOpfFile = std::move(containerParser.fullPath); return true;}
bool Epub::parseContentOpf(BookMetadataCache::BookMetadata& bookMetadata) { std::string contentOpfFilePath; if (!findContentOpfFile(&contentOpfFilePath)) { LOG_ERR("EBP", "Could not find content.opf in zip"); return false; }
contentBasePath = contentOpfFilePath.substr(0, contentOpfFilePath.find_last_of('/') + 1);
LOG_DBG("EBP", "Parsing content.opf: %s", contentOpfFilePath.c_str());
size_t contentOpfSize; if (!getItemSize(contentOpfFilePath, &contentOpfSize)) { LOG_ERR("EBP", "Could not get size of content.opf"); return false; }
ContentOpfParser opfParser(getCachePath(), getBasePath(), contentOpfSize, bookMetadataCache.get()); if (!opfParser.setup()) { LOG_ERR("EBP", "Could not setup content.opf parser"); return false; }
if (!readItemContentsToStream(contentOpfFilePath, opfParser, 1024)) { LOG_ERR("EBP", "Could not read content.opf"); return false; }
// Grab data from opfParser into epub bookMetadata.title = opfParser.title; bookMetadata.author = opfParser.author; bookMetadata.language = opfParser.language; bookMetadata.coverItemHref = opfParser.coverItemHref;
// Guide-based cover fallback: if no cover found via metadata/properties, // try extracting the image reference from the guide's cover page XHTML if (bookMetadata.coverItemHref.empty() && !opfParser.guideCoverPageHref.empty()) { LOG_DBG("EBP", "No cover from metadata, trying guide cover page: %s", opfParser.guideCoverPageHref.c_str()); size_t coverPageSize; uint8_t* coverPageData = readItemContentsToBytes(opfParser.guideCoverPageHref, &coverPageSize, true); if (coverPageData) { const std::string coverPageHtml(reinterpret_cast<char*>(coverPageData), coverPageSize); free(coverPageData);
// Determine base path of the cover page for resolving relative image references std::string coverPageBase; const auto lastSlash = opfParser.guideCoverPageHref.rfind('/'); if (lastSlash != std::string::npos) { coverPageBase = opfParser.guideCoverPageHref.substr(0, lastSlash + 1); }
// Search for image references: xlink:href="..." (SVG) and src="..." (img) std::string imageRef; for (const char* pattern : {"xlink:href=\"", "src=\""}) { auto pos = coverPageHtml.find(pattern); while (pos != std::string::npos) { pos += strlen(pattern); const auto endPos = coverPageHtml.find('"', pos); if (endPos != std::string::npos) { const auto ref = std::string_view{coverPageHtml}.substr(pos, endPos - pos); // Check if it's an image file if (FsHelpers::hasPngExtension(ref) || FsHelpers::hasJpgExtension(ref) || FsHelpers::hasGifExtension(ref)) { imageRef = ref; break; } } pos = coverPageHtml.find(pattern, pos); } if (!imageRef.empty()) break; }
if (!imageRef.empty()) { bookMetadata.coverItemHref = FsHelpers::normalisePath(coverPageBase + imageRef); LOG_DBG("EBP", "Found cover image from guide: %s", bookMetadata.coverItemHref.c_str()); } } }
bookMetadata.textReferenceHref = opfParser.textReferenceHref;
if (!opfParser.tocNcxPath.empty()) { tocNcxItem = opfParser.tocNcxPath; }
if (!opfParser.tocNavPath.empty()) { tocNavItem = opfParser.tocNavPath; }
if (!opfParser.cssFiles.empty()) { cssFiles = opfParser.cssFiles; }
LOG_DBG("EBP", "Successfully parsed content.opf"); return true;}
bool Epub::parseTocNcxFile() const { // the ncx file should have been specified in the content.opf file if (tocNcxItem.empty()) { LOG_DBG("EBP", "No ncx file specified"); return false; }
LOG_DBG("EBP", "Parsing toc ncx file: %s", tocNcxItem.c_str());
const auto tmpNcxPath = getCachePath() + "/toc.ncx"; FsFile tempNcxFile; if (!Storage.openFileForWrite("EBP", tmpNcxPath, tempNcxFile)) { return false; } readItemContentsToStream(tocNcxItem, tempNcxFile, 1024); // Explicitly close() file before reopening for reading tempNcxFile.close(); if (!Storage.openFileForRead("EBP", tmpNcxPath, tempNcxFile)) { return false; } const auto ncxSize = tempNcxFile.size();
TocNcxParser ncxParser(contentBasePath, ncxSize, bookMetadataCache.get());
if (!ncxParser.setup()) { LOG_ERR("EBP", "Could not setup toc ncx parser"); return false; }
const auto ncxBuffer = static_cast<uint8_t*>(malloc(1024)); if (!ncxBuffer) { LOG_ERR("EBP", "Could not allocate memory for toc ncx parser"); return false; }
while (tempNcxFile.available()) { const auto readSize = tempNcxFile.read(ncxBuffer, 1024); if (readSize == 0) break; const auto processedSize = ncxParser.write(ncxBuffer, readSize);
if (processedSize != readSize) { LOG_ERR("EBP", "Could not process all toc ncx data"); free(ncxBuffer); return false; } }
free(ncxBuffer); // Explicitly close() file before calling Storage.remove() tempNcxFile.close(); Storage.remove(tmpNcxPath.c_str());
LOG_DBG("EBP", "Parsed TOC items"); return true;}
bool Epub::parseTocNavFile() const { // the nav file should have been specified in the content.opf file (EPUB 3) if (tocNavItem.empty()) { LOG_DBG("EBP", "No nav file specified"); return false; }
LOG_DBG("EBP", "Parsing toc nav file: %s", tocNavItem.c_str());
const auto tmpNavPath = getCachePath() + "/toc.nav"; FsFile tempNavFile; if (!Storage.openFileForWrite("EBP", tmpNavPath, tempNavFile)) { return false; } readItemContentsToStream(tocNavItem, tempNavFile, 1024); // Explicitly close() file before reopening for reading tempNavFile.close(); if (!Storage.openFileForRead("EBP", tmpNavPath, tempNavFile)) { return false; } const auto navSize = tempNavFile.size();
// Note: We can't use `contentBasePath` here as the nav file may be in a different folder to the content.opf // and the HTMLX nav file will have hrefs relative to itself const std::string navContentBasePath = tocNavItem.substr(0, tocNavItem.find_last_of('/') + 1); TocNavParser navParser(navContentBasePath, navSize, bookMetadataCache.get());
if (!navParser.setup()) { LOG_ERR("EBP", "Could not setup toc nav parser"); return false; }
const auto navBuffer = static_cast<uint8_t*>(malloc(1024)); if (!navBuffer) { LOG_ERR("EBP", "Could not allocate memory for toc nav parser"); return false; }
while (tempNavFile.available()) { const auto readSize = tempNavFile.read(navBuffer, 1024); const auto processedSize = navParser.write(navBuffer, readSize);
if (processedSize != readSize) { LOG_ERR("EBP", "Could not process all toc nav data"); free(navBuffer); return false; } }
free(navBuffer); // Explicitly close() file before calling Storage.remove() tempNavFile.close(); Storage.remove(tmpNavPath.c_str());
LOG_DBG("EBP", "Parsed TOC nav items"); return true;}
void Epub::parseCssFiles() const { // Maximum CSS file size we'll attempt to parse (uncompressed) // Larger files risk memory exhaustion on ESP32 constexpr size_t MAX_CSS_FILE_SIZE = 128 * 1024; // 128KB // Minimum heap required before attempting CSS parsing constexpr size_t MIN_HEAP_FOR_CSS_PARSING = 64 * 1024; // 64KB
if (cssFiles.empty()) { LOG_DBG("EBP", "No CSS files to parse, but CssParser created for inline styles"); }
LOG_DBG("EBP", "CSS files to parse: %zu", cssFiles.size());
// See if we have a cached version of the CSS rules if (cssParser->hasCache()) { LOG_DBG("EBP", "CSS cache exists, skipping parseCssFiles"); return; }
// No cache yet - parse CSS files for (const auto& cssPath : cssFiles) { LOG_DBG("EBP", "Parsing CSS file: %s", cssPath.c_str());
// Check heap before parsing - CSS parsing allocates heavily const uint32_t freeHeap = ESP.getFreeHeap(); if (freeHeap < MIN_HEAP_FOR_CSS_PARSING) { LOG_ERR("EBP", "Insufficient heap for CSS parsing (%u bytes free, need %zu), skipping: %s", freeHeap, MIN_HEAP_FOR_CSS_PARSING, cssPath.c_str()); continue; }
// Check CSS file size before decompressing - skip files that are too large size_t cssFileSize = 0; if (getItemSize(cssPath, &cssFileSize)) { if (cssFileSize > MAX_CSS_FILE_SIZE) { LOG_ERR("EBP", "CSS file too large (%zu bytes > %zu max), skipping: %s", cssFileSize, MAX_CSS_FILE_SIZE, cssPath.c_str()); continue; } }
// Extract CSS file to temp location const auto tmpCssPath = getCachePath() + "/.tmp.css"; FsFile tempCssFile; if (!Storage.openFileForWrite("EBP", tmpCssPath, tempCssFile)) { LOG_ERR("EBP", "Could not create temp CSS file"); continue; } if (!readItemContentsToStream(cssPath, tempCssFile, 1024)) { LOG_ERR("EBP", "Could not read CSS file: %s", cssPath.c_str()); // Explicitly close() file before calling Storage.remove() tempCssFile.close(); Storage.remove(tmpCssPath.c_str()); continue; } // Explicitly close() file before reopening for reading tempCssFile.close();
// Parse the CSS file if (!Storage.openFileForRead("EBP", tmpCssPath, tempCssFile)) { LOG_ERR("EBP", "Could not open temp CSS file for reading"); Storage.remove(tmpCssPath.c_str()); continue; } cssParser->loadFromStream(tempCssFile); // Explicitly close() file before calling Storage.remove() tempCssFile.close(); Storage.remove(tmpCssPath.c_str()); }
// Save to cache for next time if (!cssParser->saveToCache()) { LOG_ERR("EBP", "Failed to save CSS rules to cache"); } cssParser->clear();
LOG_DBG("EBP", "Loaded %zu CSS style rules from %zu files", cssParser->ruleCount(), cssFiles.size());}
// load in the meta data for the epub filebool Epub::load(const bool buildIfMissing, const bool skipLoadingCss) { LOG_DBG("EBP", "Loading ePub: %s", filepath.c_str());
// Initialize spine/TOC cache bookMetadataCache.reset(new BookMetadataCache(cachePath)); // Always create CssParser - needed for inline style parsing even without CSS files cssParser.reset(new CssParser(cachePath));
// Try to load existing cache first if (bookMetadataCache->load()) { if (!skipLoadingCss) { // Rebuild CSS cache when missing or when cache version changed (loadFromCache removes stale file) if (!cssParser->hasCache() || !cssParser->loadFromCache()) { LOG_DBG("EBP", "CSS rules cache missing or stale, attempting to parse CSS files"); cssParser->deleteCache();
if (!parseContentOpf(bookMetadataCache->coreMetadata)) { LOG_ERR("EBP", "Could not parse content.opf from cached bookMetadata for CSS files"); // continue anyway - book will work without CSS and we'll still load any inline style CSS } parseCssFiles(); // Invalidate section caches so they are rebuilt with the new CSS Storage.removeDir((cachePath + "/sections").c_str()); } } LOG_DBG("EBP", "Loaded ePub: %s", filepath.c_str()); return true; }
// If we didn't load from cache above and we aren't allowed to build, fail now if (!buildIfMissing) { return false; }
// Cache doesn't exist or is invalid, build it LOG_DBG("EBP", "Cache not found, building spine/TOC cache"); setupCacheDir();
const uint32_t indexingStart = millis();
// Begin building cache - stream entries to disk immediately if (!bookMetadataCache->beginWrite()) { LOG_ERR("EBP", "Could not begin writing cache"); return false; }
// OPF Pass const uint32_t opfStart = millis(); BookMetadataCache::BookMetadata bookMetadata; if (!bookMetadataCache->beginContentOpfPass()) { LOG_ERR("EBP", "Could not begin writing content.opf pass"); return false; } if (!parseContentOpf(bookMetadata)) { LOG_ERR("EBP", "Could not parse content.opf"); return false; } if (!bookMetadataCache->endContentOpfPass()) { LOG_ERR("EBP", "Could not end writing content.opf pass"); return false; } LOG_DBG("EBP", "OPF pass completed in %lu ms", millis() - opfStart);
// TOC Pass - try EPUB 3 nav first, fall back to NCX const uint32_t tocStart = millis(); if (!bookMetadataCache->beginTocPass()) { LOG_ERR("EBP", "Could not begin writing toc pass"); return false; }
bool tocParsed = false;
// Try EPUB 3 nav document first (preferred) if (!tocNavItem.empty()) { LOG_DBG("EBP", "Attempting to parse EPUB 3 nav document"); tocParsed = parseTocNavFile(); }
// Fall back to NCX if nav parsing failed or wasn't available if (!tocParsed && !tocNcxItem.empty()) { LOG_DBG("EBP", "Falling back to NCX TOC"); tocParsed = parseTocNcxFile(); }
if (!tocParsed) { LOG_ERR("EBP", "Warning: Could not parse any TOC format"); // Continue anyway - book will work without TOC }
if (!bookMetadataCache->endTocPass()) { LOG_ERR("EBP", "Could not end writing toc pass"); return false; } LOG_DBG("EBP", "TOC pass completed in %lu ms", millis() - tocStart);
// Close the cache files if (!bookMetadataCache->endWrite()) { LOG_ERR("EBP", "Could not end writing cache"); return false; }
// Build final book.bin const uint32_t buildStart = millis(); if (!bookMetadataCache->buildBookBin(filepath, bookMetadata)) { LOG_ERR("EBP", "Could not update mappings and sizes"); return false; } LOG_DBG("EBP", "buildBookBin completed in %lu ms", millis() - buildStart); LOG_DBG("EBP", "Total indexing completed in %lu ms", millis() - indexingStart);
if (!bookMetadataCache->cleanupTmpFiles()) { LOG_DBG("EBP", "Could not cleanup tmp files - ignoring"); }
// Reload the cache from disk so it's in the correct state bookMetadataCache.reset(new BookMetadataCache(cachePath)); if (!bookMetadataCache->load()) { LOG_ERR("EBP", "Failed to reload cache after writing"); return false; }
if (!skipLoadingCss) { // Parse CSS files after cache reload parseCssFiles(); Storage.removeDir((cachePath + "/sections").c_str()); }
LOG_DBG("EBP", "Loaded ePub: %s", filepath.c_str()); return true;}
bool Epub::clearCache() const { if (!Storage.exists(cachePath.c_str())) { LOG_DBG("EPB", "Cache does not exist, no action needed"); return true; }
if (!Storage.removeDir(cachePath.c_str())) { LOG_ERR("EPB", "Failed to clear cache"); return false; }
LOG_DBG("EPB", "Cache cleared successfully"); return true;}
void Epub::setupCacheDir() const { if (Storage.exists(cachePath.c_str())) { return; }
Storage.mkdir(cachePath.c_str());}
const std::string& Epub::getCachePath() const { return cachePath; }
const std::string& Epub::getPath() const { return filepath; }
const std::string& Epub::getTitle() const { static std::string blank; if (!bookMetadataCache || !bookMetadataCache->isLoaded()) { return blank; }
return bookMetadataCache->coreMetadata.title;}
const std::string& Epub::getAuthor() const { static std::string blank; if (!bookMetadataCache || !bookMetadataCache->isLoaded()) { return blank; }
return bookMetadataCache->coreMetadata.author;}
const std::string& Epub::getLanguage() const { static std::string blank; if (!bookMetadataCache || !bookMetadataCache->isLoaded()) { return blank; }
return bookMetadataCache->coreMetadata.language;}
std::string Epub::getCoverBmpPath(bool cropped) const { const auto coverFileName = std::string("cover") + (cropped ? "_crop" : ""); return cachePath + "/" + coverFileName + ".bmp";}
bool Epub::generateCoverBmp(bool cropped) const { // Already generated, return true if (Storage.exists(getCoverBmpPath(cropped).c_str())) { return true; }
if (!bookMetadataCache || !bookMetadataCache->isLoaded()) { LOG_ERR("EBP", "Cannot generate cover BMP, cache not loaded"); return false; }
const auto coverImageHref = bookMetadataCache->coreMetadata.coverItemHref; if (coverImageHref.empty()) { LOG_ERR("EBP", "No known cover image"); return false; }
if (FsHelpers::hasJpgExtension(coverImageHref)) { LOG_DBG("EBP", "Generating BMP from JPG cover image (%s mode)", cropped ? "cropped" : "fit"); const auto coverJpgTempPath = getCachePath() + "/.cover.jpg";
FsFile coverJpg; if (!Storage.openFileForWrite("EBP", coverJpgTempPath, coverJpg)) { return false; } readItemContentsToStream(coverImageHref, coverJpg, 1024); // Explicitly close() file before reopening for reading coverJpg.close();
if (!Storage.openFileForRead("EBP", coverJpgTempPath, coverJpg)) { return false; }
FsFile coverBmp; if (!Storage.openFileForWrite("EBP", getCoverBmpPath(cropped), coverBmp)) { return false; } const bool success = JpegToBmpConverter::jpegFileToBmpStream(coverJpg, coverBmp, cropped); // Explicitly close() files before calling Storage.remove() coverJpg.close(); coverBmp.close(); Storage.remove(coverJpgTempPath.c_str());
if (!success) { LOG_ERR("EBP", "Failed to generate BMP from cover image"); Storage.remove(getCoverBmpPath(cropped).c_str()); } LOG_DBG("EBP", "Generated BMP from JPG cover image, success: %s", success ? "yes" : "no"); return success; }
if (FsHelpers::hasPngExtension(coverImageHref)) { LOG_DBG("EBP", "Generating BMP from PNG cover image (%s mode)", cropped ? "cropped" : "fit"); const auto coverPngTempPath = getCachePath() + "/.cover.png";
FsFile coverPng; if (!Storage.openFileForWrite("EBP", coverPngTempPath, coverPng)) { return false; } readItemContentsToStream(coverImageHref, coverPng, 1024); // Explicitly close() file before reopening for reading coverPng.close();
if (!Storage.openFileForRead("EBP", coverPngTempPath, coverPng)) { return false; }
FsFile coverBmp; if (!Storage.openFileForWrite("EBP", getCoverBmpPath(cropped), coverBmp)) { return false; } const bool success = PngToBmpConverter::pngFileToBmpStream(coverPng, coverBmp, cropped); // Explicitly close() files before calling Storage.remove() coverPng.close(); coverBmp.close(); Storage.remove(coverPngTempPath.c_str());
if (!success) { LOG_ERR("EBP", "Failed to generate BMP from PNG cover image"); Storage.remove(getCoverBmpPath(cropped).c_str()); } LOG_DBG("EBP", "Generated BMP from PNG cover image, success: %s", success ? "yes" : "no"); return success; }
LOG_ERR("EBP", "Cover image is not a supported format, skipping"); return false;}
std::string Epub::getThumbBmpPath() const { return cachePath + "/thumb_[HEIGHT].bmp"; }std::string Epub::getThumbBmpPath(int height) const { return cachePath + "/thumb_" + std::to_string(height) + ".bmp"; }
bool Epub::generateThumbBmp(int height) const { // Already generated, return true if (Storage.exists(getThumbBmpPath(height).c_str())) { return true; }
if (!bookMetadataCache || !bookMetadataCache->isLoaded()) { LOG_ERR("EBP", "Cannot generate thumb BMP, cache not loaded"); return false; }
const auto coverImageHref = bookMetadataCache->coreMetadata.coverItemHref; if (coverImageHref.empty()) { LOG_DBG("EBP", "No known cover image for thumbnail"); } else if (FsHelpers::hasJpgExtension(coverImageHref)) { LOG_DBG("EBP", "Generating thumb BMP from JPG cover image"); const auto coverJpgTempPath = getCachePath() + "/.cover.jpg";
FsFile coverJpg; if (!Storage.openFileForWrite("EBP", coverJpgTempPath, coverJpg)) { return false; } readItemContentsToStream(coverImageHref, coverJpg, 1024); // Explicitly close() file before reopening for reading coverJpg.close();
if (!Storage.openFileForRead("EBP", coverJpgTempPath, coverJpg)) { return false; }
FsFile thumbBmp; if (!Storage.openFileForWrite("EBP", getThumbBmpPath(height), thumbBmp)) { return false; } // Use smaller target size for Continue Reading card (half of screen: 240x400) // Generate 1-bit BMP for fast home screen rendering (no gray passes needed) int THUMB_TARGET_WIDTH = height * 0.6; int THUMB_TARGET_HEIGHT = height; const bool success = JpegToBmpConverter::jpegFileTo1BitBmpStreamWithSize(coverJpg, thumbBmp, THUMB_TARGET_WIDTH, THUMB_TARGET_HEIGHT); // Explicitly close() files before calling Storage.remove() coverJpg.close(); thumbBmp.close(); Storage.remove(coverJpgTempPath.c_str());
if (!success) { LOG_ERR("EBP", "Failed to generate thumb BMP from JPG cover image"); Storage.remove(getThumbBmpPath(height).c_str()); } LOG_DBG("EBP", "Generated thumb BMP from JPG cover image, success: %s", success ? "yes" : "no"); return success; } else if (FsHelpers::hasPngExtension(coverImageHref)) { LOG_DBG("EBP", "Generating thumb BMP from PNG cover image"); const auto coverPngTempPath = getCachePath() + "/.cover.png";
FsFile coverPng; if (!Storage.openFileForWrite("EBP", coverPngTempPath, coverPng)) { return false; } readItemContentsToStream(coverImageHref, coverPng, 1024); // Explicitly close() file before reopening for reading coverPng.close();
if (!Storage.openFileForRead("EBP", coverPngTempPath, coverPng)) { return false; }
FsFile thumbBmp; if (!Storage.openFileForWrite("EBP", getThumbBmpPath(height), thumbBmp)) { return false; } int THUMB_TARGET_WIDTH = height * 0.6; int THUMB_TARGET_HEIGHT = height; const bool success = PngToBmpConverter::pngFileTo1BitBmpStreamWithSize(coverPng, thumbBmp, THUMB_TARGET_WIDTH, THUMB_TARGET_HEIGHT); // Explicitly close() files before calling Storage.remove() coverPng.close(); thumbBmp.close(); Storage.remove(coverPngTempPath.c_str());
if (!success) { LOG_ERR("EBP", "Failed to generate thumb BMP from PNG cover image"); Storage.remove(getThumbBmpPath(height).c_str()); } LOG_DBG("EBP", "Generated thumb BMP from PNG cover image, success: %s", success ? "yes" : "no"); return success; } else { LOG_ERR("EBP", "Cover image is not a supported format, skipping thumbnail"); }
// Write an empty bmp file to avoid generation attempts in the future FsFile thumbBmp; Storage.openFileForWrite("EBP", getThumbBmpPath(height), thumbBmp); return false;}
uint8_t* Epub::readItemContentsToBytes(const std::string& itemHref, size_t* size, const bool trailingNullByte) const { if (itemHref.empty()) { LOG_DBG("EBP", "Failed to read item, empty href"); return nullptr; }
const std::string path = FsHelpers::normalisePath(itemHref);
const auto content = ZipFile(filepath).readFileToMemory(path.c_str(), size, trailingNullByte); if (!content) { LOG_DBG("EBP", "Failed to read item %s", path.c_str()); return nullptr; }
return content;}
bool Epub::readItemContentsToStream(const std::string& itemHref, Print& out, const size_t chunkSize) const { if (itemHref.empty()) { LOG_DBG("EBP", "Failed to read item, empty href"); return false; }
const std::string path = FsHelpers::normalisePath(itemHref); return ZipFile(filepath).readFileToStream(path.c_str(), out, chunkSize);}
bool Epub::getItemSize(const std::string& itemHref, size_t* size) const { const std::string path = FsHelpers::normalisePath(itemHref); return ZipFile(filepath).getInflatedFileSize(path.c_str(), size);}
int Epub::getSpineItemsCount() const { if (!bookMetadataCache || !bookMetadataCache->isLoaded()) { return 0; } return bookMetadataCache->getSpineCount();}
size_t Epub::getCumulativeSpineItemSize(const int spineIndex) const { return getSpineItem(spineIndex).cumulativeSize; }
BookMetadataCache::SpineEntry Epub::getSpineItem(const int spineIndex) const { if (!bookMetadataCache || !bookMetadataCache->isLoaded()) { LOG_ERR("EBP", "getSpineItem called but cache not loaded"); return {}; }
if (spineIndex < 0 || spineIndex >= bookMetadataCache->getSpineCount()) { LOG_ERR("EBP", "getSpineItem index:%d is out of range", spineIndex); return bookMetadataCache->getSpineEntry(0); }
return bookMetadataCache->getSpineEntry(spineIndex);}
BookMetadataCache::TocEntry Epub::getTocItem(const int tocIndex) const { if (!bookMetadataCache || !bookMetadataCache->isLoaded()) { LOG_DBG("EBP", "getTocItem called but cache not loaded"); return {}; }
if (tocIndex < 0 || tocIndex >= bookMetadataCache->getTocCount()) { LOG_DBG("EBP", "getTocItem index:%d is out of range", tocIndex); return {}; }
return bookMetadataCache->getTocEntry(tocIndex);}
int Epub::getTocItemsCount() const { if (!bookMetadataCache || !bookMetadataCache->isLoaded()) { return 0; }
return bookMetadataCache->getTocCount();}
// work out the section index for a toc indexint Epub::getSpineIndexForTocIndex(const int tocIndex) const { if (!bookMetadataCache || !bookMetadataCache->isLoaded()) { LOG_ERR("EBP", "getSpineIndexForTocIndex called but cache not loaded"); return 0; }
if (tocIndex < 0 || tocIndex >= bookMetadataCache->getTocCount()) { LOG_ERR("EBP", "getSpineIndexForTocIndex: tocIndex %d out of range", tocIndex); return 0; }
const int spineIndex = bookMetadataCache->getTocEntry(tocIndex).spineIndex; if (spineIndex < 0) { LOG_DBG("EBP", "Section not found for TOC index %d", tocIndex); return 0; }
return spineIndex;}
int Epub::getTocIndexForSpineIndex(const int spineIndex) const { return getSpineItem(spineIndex).tocIndex; }
size_t Epub::getBookSize() const { if (!bookMetadataCache || !bookMetadataCache->isLoaded() || bookMetadataCache->getSpineCount() == 0) { return 0; } return getCumulativeSpineItemSize(getSpineItemsCount() - 1);}
int Epub::getSpineIndexForTextReference() const { if (!bookMetadataCache || !bookMetadataCache->isLoaded()) { LOG_ERR("EBP", "getSpineIndexForTextReference called but cache not loaded"); return 0; } LOG_DBG("EBP", "Core Metadata: cover(%d)=%s, textReference(%d)=%s", bookMetadataCache->coreMetadata.coverItemHref.size(), bookMetadataCache->coreMetadata.coverItemHref.c_str(), bookMetadataCache->coreMetadata.textReferenceHref.size(), bookMetadataCache->coreMetadata.textReferenceHref.c_str());
if (bookMetadataCache->coreMetadata.textReferenceHref.empty()) { // there was no textReference in epub, so we return 0 (the first chapter) return 0; }
// loop through spine items to get the correct index matching the text href for (size_t i = 0; i < getSpineItemsCount(); i++) { if (getSpineItem(i).href == bookMetadataCache->coreMetadata.textReferenceHref) { LOG_DBG("EBP", "Text reference %s found at index %d", bookMetadataCache->coreMetadata.textReferenceHref.c_str(), i); return i; } } // This should not happen, as we checked for empty textReferenceHref earlier LOG_DBG("EBP", "Section not found for text reference"); return 0;}
// Calculate progress in book (returns 0.0-1.0)float Epub::calculateProgress(const int currentSpineIndex, const float currentSpineRead) const { const size_t bookSize = getBookSize(); if (bookSize == 0) { return 0.0f; } const size_t prevChapterSize = (currentSpineIndex >= 1) ? getCumulativeSpineItemSize(currentSpineIndex - 1) : 0; const size_t curChapterSize = getCumulativeSpineItemSize(currentSpineIndex) - prevChapterSize; const float sectionProgSize = currentSpineRead * static_cast<float>(curChapterSize); const float totalProgress = static_cast<float>(prevChapterSize) + sectionProgSize; return totalProgress / static_cast<float>(bookSize);}
int Epub::resolveHrefToSpineIndex(const std::string& href) const { if (!bookMetadataCache || !bookMetadataCache->isLoaded()) return -1;
// Extract filename (remove #anchor) std::string target = href; size_t hashPos = target.find('#'); if (hashPos != std::string::npos) target = target.substr(0, hashPos);
// Same-file reference (anchor-only) if (target.empty()) return -1;
// Extract just the filename for comparison size_t targetSlash = target.find_last_of('/'); std::string targetFilename = (targetSlash != std::string::npos) ? target.substr(targetSlash + 1) : target;
for (int i = 0; i < getSpineItemsCount(); i++) { const auto& spineHref = getSpineItem(i).href; // Try exact match first if (spineHref == target) return i; // Then filename-only match size_t spineSlash = spineHref.find_last_of('/'); std::string spineFilename = (spineSlash != std::string::npos) ? spineHref.substr(spineSlash + 1) : spineHref; if (spineFilename == targetFilename) return i; } return -1;}