//Reading navigation map starting from <navMap> node
private static async Task <EpubNavigationMap> ReadNavigationMapAsync(XmlReader reader)
{
EpubNavigationMap result = new EpubNavigationMap();
bool mapFound = await reader.ReadToFollowingAsync("navMap", "http://www.daisy.org/z3986/2005/ncx/");
if (!mapFound)
{
throw new Exception("EPUB parsing error: navMap section not found in the .toc file.");
}
//reading till the </navMap> tag appearance
while (await reader.ReadAsync() && !(reader.NodeType == XmlNodeType.EndElement && reader.LocalName == "navMap"))
{
//We are looking for a top-level <navPoint> entries, considering that it could be any level of nesting:
if ((reader.LocalName == "navPoint") && (reader.NodeType != XmlNodeType.EndElement))
{
//We need to create a subreader space to limit the scope for each single navPoint
XmlReader subReader = reader.ReadSubtree();
EpubNavigationPoint navigationPoint = await ReadNavigationPointAsync(subReader);
//we reached the end of the top-level <navPoint> entry and it is time to add it to collection and to get rid of the sub-reader
result.Add(navigationPoint);
subReader.Dispose();
}
}
return(result);
}
private static EpubNavigationMap ReadNavigationMap(XElement navigationMapNode)
{
EpubNavigationMap result = new EpubNavigationMap();
foreach (XElement navigationPointNode in navigationMapNode.Elements())
{
if (String.Compare(navigationPointNode.Name.LocalName, "navPoint", StringComparison.OrdinalIgnoreCase) == 0)
{
EpubNavigationPoint navigationPoint = ReadNavigationPoint(navigationPointNode);
result.Add(navigationPoint);
}
}
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);
}
//Reading navigation map starting from <navMap> node
private static async Task<EpubNavigationMap> ReadNavigationMapAsync(XmlReader reader)
{
EpubNavigationMap result = new EpubNavigationMap();
bool mapFound = await reader.ReadToFollowingAsync("navMap", "http://www.daisy.org/z3986/2005/ncx/");
if (!mapFound)
throw new Exception("EPUB parsing error: navMap section not found in the .toc file.");
//reading till the </navMap> tag appearance
while (await reader.ReadAsync() && !(reader.NodeType == XmlNodeType.EndElement && reader.LocalName == "navMap"))
{
//We are looking for a top-level <navPoint> entries, considering that it could be any level of nesting:
if ((reader.LocalName == "navPoint") && (reader.NodeType != XmlNodeType.EndElement))
{
//We need to create a subreader space to limit the scope for each single navPoint
XmlReader subReader = reader.ReadSubtree();
EpubNavigationPoint navigationPoint = await ReadNavigationPointAsync(subReader);
//we reached the end of the top-level <navPoint> entry and it is time to add it to collection and to get rid of the sub-reader
result.Add(navigationPoint);
subReader.Dispose();
}
}
return result;
}
private static EpubNavigationMap ReadNavigationMap(XmlNode navigationMapNode)
{
EpubNavigationMap result = new EpubNavigationMap();
foreach (XmlNode navigationPointNode in navigationMapNode.ChildNodes)
if (String.Compare(navigationPointNode.LocalName, "navPoint", StringComparison.OrdinalIgnoreCase) == 0)
{
EpubNavigationPoint navigationPoint = ReadNavigationPoint(navigationPointNode);
result.Add(navigationPoint);
}
return result;
}
