public static async Task <Epub2Ncx> ReadEpub2NcxAsync(ZipArchive epubArchive, string contentDirectoryPath, EpubPackage package)
{
Epub2Ncx result = new Epub2Ncx();
string tocId = package.Spine.Toc;
if (String.IsNullOrEmpty(tocId))
{
return(null);
}
EpubManifestItem tocManifestItem = package.Manifest.FirstOrDefault(item => item.Id.CompareOrdinalIgnoreCase(tocId));
if (tocManifestItem == null)
{
throw new Exception($"EPUB parsing error: TOC item {tocId} not found in EPUB manifest.");
}
string tocFileEntryPath = ZipPathUtils.Combine(contentDirectoryPath, tocManifestItem.Href);
ZipArchiveEntry tocFileEntry = epubArchive.GetEntry(tocFileEntryPath);
if (tocFileEntry == null)
{
throw new Exception($"EPUB parsing error: TOC file {tocFileEntryPath} not found in archive.");
}
if (tocFileEntry.Length > Int32.MaxValue)
{
throw new Exception($"EPUB parsing error: TOC file {tocFileEntryPath} is larger than 2 Gb.");
}
XDocument containerDocument;
using (Stream containerStream = tocFileEntry.Open())
{
containerDocument = await XmlUtils.LoadDocumentAsync(containerStream).ConfigureAwait(false);
}
XNamespace ncxNamespace = "http://www.daisy.org/z3986/2005/ncx/";
XElement ncxNode = containerDocument.Element(ncxNamespace + "ncx");
if (ncxNode == null)
{
throw new Exception("EPUB parsing error: TOC file does not contain ncx element.");
}
XElement headNode = ncxNode.Element(ncxNamespace + "head");
if (headNode == null)
{
throw new Exception("EPUB parsing error: TOC file does not contain head element.");
}
Epub2NcxHead navigationHead = ReadNavigationHead(headNode);
result.Head = navigationHead;
XElement docTitleNode = ncxNode.Element(ncxNamespace + "docTitle");
if (docTitleNode == null)
{
throw new Exception("EPUB parsing error: TOC file does not contain docTitle element.");
}
Epub2NcxDocTitle navigationDocTitle = ReadNavigationDocTitle(docTitleNode);
result.DocTitle = navigationDocTitle;
result.DocAuthors = new List <Epub2NcxDocAuthor>();
foreach (XElement docAuthorNode in ncxNode.Elements(ncxNamespace + "docAuthor"))
{
Epub2NcxDocAuthor navigationDocAuthor = ReadNavigationDocAuthor(docAuthorNode);
result.DocAuthors.Add(navigationDocAuthor);
}
XElement navMapNode = ncxNode.Element(ncxNamespace + "navMap");
if (navMapNode == null)
{
throw new Exception("EPUB parsing error: TOC file does not contain navMap element.");
}
Epub2NcxNavigationMap navMap = ReadNavigationMap(navMapNode);
result.NavMap = navMap;
XElement pageListNode = ncxNode.Element(ncxNamespace + "pageList");
if (pageListNode != null)
{
Epub2NcxPageList pageList = ReadNavigationPageList(pageListNode);
result.PageList = pageList;
}
result.NavLists = new List <Epub2NcxNavigationList>();
foreach (XElement navigationListNode in ncxNode.Elements(ncxNamespace + "navList"))
{
Epub2NcxNavigationList navigationList = ReadNavigationList(navigationListNode);
result.NavLists.Add(navigationList);
}
return(result);
}
public static List <EpubNavigationItemRef> GetNavigationItems(EpubBookRef bookRef, Epub2Ncx epub2Ncx)
{
return(GetNavigationItems(bookRef, epub2Ncx.NavMap));
}