private static EpubNavigationList ReadNavigationList(XElement navigationListNode)
{
var result = new EpubNavigationList();
foreach (var navigationListNodeAttribute in navigationListNode.Attributes())
{
var attributeValue = navigationListNodeAttribute.Value;
switch (navigationListNodeAttribute.Name.LocalName.ToLowerInvariant())
{
case "id":
result.Id = attributeValue;
break;
case "class":
result.Class = attributeValue;
break;
}
}
foreach (var navigationListChildNode in navigationListNode.Elements())
{
switch (navigationListChildNode.Name.LocalName.ToLowerInvariant())
{
case "navlabel":
var navigationLabel = ReadNavigationLabel(navigationListChildNode);
result.NavigationLabels.Add(navigationLabel);
break;
case "navTarget":
var navigationTarget = ReadNavigationTarget(navigationListChildNode);
result.NavigationTargets.Add(navigationTarget);
break;
}
}
if (!result.NavigationLabels.Any())
{
throw new Exception("Incorrect EPUB navigation page target: at least one navLabel element is required.");
}
return(result);
}
public static async Task <EpubNavigation> ReadNavigationAsync(ZipArchive epubArchive, string contentDirectoryPath, EpubPackage package)
{
EpubNavigation result = new EpubNavigation();
string tocId = package.Spine.Toc;
if (String.IsNullOrEmpty(tocId))
{
throw new Exception("EPUB parsing error: TOC ID is empty.");
}
EpubManifestItem tocManifestItem = package.Manifest.FirstOrDefault(item => String.Compare(item.Id, tocId, StringComparison.OrdinalIgnoreCase) == 0);
if (tocManifestItem == null)
{
throw new Exception(String.Format("EPUB parsing error: TOC item {0} not found in EPUB manifest.", tocId));
}
string tocFileEntryPath = ZipPathUtils.Combine(contentDirectoryPath, tocManifestItem.Href);
ZipArchiveEntry tocFileEntry = epubArchive.GetEntry(tocFileEntryPath);
if (tocFileEntry == null)
{
throw new Exception(String.Format("EPUB parsing error: TOC file {0} not found in archive.", tocFileEntryPath));
}
if (tocFileEntry.Length > Int32.MaxValue)
{
throw new Exception(String.Format("EPUB parsing error: TOC file {0} is larger than 2 Gb.", tocFileEntryPath));
}
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.");
}
EpubNavigationHead 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.");
}
EpubNavigationDocTitle navigationDocTitle = ReadNavigationDocTitle(docTitleNode);
result.DocTitle = navigationDocTitle;
result.DocAuthors = new List <EpubNavigationDocAuthor>();
foreach (XElement docAuthorNode in ncxNode.Elements(ncxNamespace + "docAuthor"))
{
EpubNavigationDocAuthor 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.");
}
EpubNavigationMap navMap = ReadNavigationMap(navMapNode);
result.NavMap = navMap;
XElement pageListNode = ncxNode.Element(ncxNamespace + "pageList");
if (pageListNode != null)
{
EpubNavigationPageList pageList = ReadNavigationPageList(pageListNode);
result.PageList = pageList;
}
result.NavLists = new List <EpubNavigationList>();
foreach (XElement navigationListNode in ncxNode.Elements(ncxNamespace + "navList"))
{
EpubNavigationList navigationList = ReadNavigationList(navigationListNode);
result.NavLists.Add(navigationList);
}
return(result);
}
public static EpubNavigation ReadNavigation(ZipArchive epubArchive, string contentDirectoryPath, EpubPackage package)
{
EpubNavigation result = new EpubNavigation();
string tocId = package.Spine.Toc;
if (String.IsNullOrEmpty(tocId))
{
throw new Exception("EPUB parsing error: TOC ID is empty.");
}
EpubManifestItem tocManifestItem = package.Manifest.FirstOrDefault(item => String.Compare(item.Id, tocId, StringComparison.OrdinalIgnoreCase) == 0);
if (tocManifestItem == null)
{
throw new Exception(String.Format("EPUB parsing error: TOC item {0} not found in EPUB manifest.", tocId));
}
string tocFileEntryPath = ZipPathUtils.Combine(contentDirectoryPath, tocManifestItem.Href);
ZipArchiveEntry tocFileEntry = epubArchive.GetEntry(tocFileEntryPath);
if (tocFileEntry == null)
{
throw new Exception(String.Format("EPUB parsing error: TOC file {0} not found in archive.", tocFileEntryPath));
}
if (tocFileEntry.Length > Int32.MaxValue)
{
throw new Exception(String.Format("EPUB parsing error: TOC file {0} is bigger than 2 Gb.", tocFileEntryPath));
}
XmlDocument containerDocument;
using (Stream containerStream = tocFileEntry.Open())
containerDocument = XmlUtils.LoadDocument(containerStream);
XmlNamespaceManager xmlNamespaceManager = new XmlNamespaceManager(containerDocument.NameTable);
xmlNamespaceManager.AddNamespace("ncx", "http://www.daisy.org/z3986/2005/ncx/");
XmlNode headNode = containerDocument.DocumentElement.SelectSingleNode("ncx:head", xmlNamespaceManager);
if (headNode == null)
{
throw new Exception("EPUB parsing error: TOC file does not contain head element");
}
EpubNavigationHead navigationHead = ReadNavigationHead(headNode);
result.Head = navigationHead;
XmlNode docTitleNode = containerDocument.DocumentElement.SelectSingleNode("ncx:docTitle", xmlNamespaceManager);
if (docTitleNode == null)
{
throw new Exception("EPUB parsing error: TOC file does not contain docTitle element");
}
EpubNavigationDocTitle navigationDocTitle = ReadNavigationDocTitle(docTitleNode);
result.DocTitle = navigationDocTitle;
result.DocAuthors = new List <EpubNavigationDocAuthor>();
foreach (XmlNode docAuthorNode in containerDocument.DocumentElement.SelectNodes("ncx:docAuthor", xmlNamespaceManager))
{
EpubNavigationDocAuthor navigationDocAuthor = ReadNavigationDocAuthor(docAuthorNode);
result.DocAuthors.Add(navigationDocAuthor);
}
XmlNode navMapNode = containerDocument.DocumentElement.SelectSingleNode("ncx:navMap", xmlNamespaceManager);
if (navMapNode == null)
{
throw new Exception("EPUB parsing error: TOC file does not contain navMap element");
}
EpubNavigationMap navMap = ReadNavigationMap(navMapNode);
result.NavMap = navMap;
XmlNode pageListNode = containerDocument.DocumentElement.SelectSingleNode("ncx:pageList", xmlNamespaceManager);
if (pageListNode != null)
{
EpubNavigationPageList pageList = ReadNavigationPageList(pageListNode);
result.PageList = pageList;
}
result.NavLists = new List <EpubNavigationList>();
foreach (XmlNode navigationListNode in containerDocument.DocumentElement.SelectNodes("ncx:navList", xmlNamespaceManager))
{
EpubNavigationList navigationList = ReadNavigationList(navigationListNode);
result.NavLists.Add(navigationList);
}
return(result);
}
