Method resolveHrefToSpineIndex

lib/Epub/Epub.cpp:902–927

}

int Epub::resolveHrefToSpineIndex(const std::string& href) const {
  if (!bookMetadataCache || !bookMetadataCache->isLoaded()) return -1;

  // Split before decoding so escaped '#' characters in filenames stay part of the path.
  const size_t hashPos = href.find('#');
  const std::string rawTarget = hashPos != std::string::npos ? href.substr(0, hashPos) : href;
  const std::string target = FsHelpers::normalisePath(FsHelpers::decodeUriEscapes(rawTarget));

  // 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;
}