public Page GetPage(int pageNumber)
{
if (locatedPages.TryGetValue(pageNumber, out DictionaryToken targetPageDictionary))
{
// TODO: cache the page
return(pageFactory.Create(pageNumber, targetPageDictionary, new PageTreeMembers(),
isLenientParsing));
}
var observed = new List <int>();
var pageTreeMembers = new PageTreeMembers();
// todo: running a search for a different, unloaded, page number, results in a bug.
var isFound = FindPage(rootPageDictionary, pageNumber, observed, pageTreeMembers);
if (!isFound || !locatedPages.TryGetValue(pageNumber, out targetPageDictionary))
{
throw new ArgumentOutOfRangeException("Could not find the page with number: " + pageNumber);
}
var page = pageFactory.Create(pageNumber, targetPageDictionary, pageTreeMembers, isLenientParsing);
locatedPages[pageNumber] = targetPageDictionary;
return(page);
}
public Page GetPage(int pageNumber)
{
if (pageNumber <= 0 || pageNumber > Count)
{
throw new ArgumentOutOfRangeException(nameof(pageNumber),
$"Page number {pageNumber} invalid, must be between 1 and {Count}.");
}
var pageNode = catalog.GetPageNode(pageNumber);
var pageStack = new Stack <PageTreeNode>();
var currentNode = pageNode;
while (currentNode != null)
{
pageStack.Push(currentNode);
currentNode = currentNode.Parent;
}
var pageTreeMembers = new PageTreeMembers();
while (pageStack.Count > 0)
{
currentNode = pageStack.Pop();
if (currentNode.NodeDictionary.TryGet(NameToken.Resources, pdfScanner, out DictionaryToken resourcesDictionary))
{
pageTreeMembers.ParentResources.Enqueue(resourcesDictionary);
}
if (currentNode.NodeDictionary.TryGet(NameToken.MediaBox, pdfScanner, out ArrayToken mediaBox))
{
pageTreeMembers.MediaBox = new MediaBox(mediaBox.ToRectangle());
}
if (currentNode.NodeDictionary.TryGet(NameToken.Rotate, pdfScanner, out NumericToken rotateToken))
{
pageTreeMembers.Rotation = rotateToken.Int;
}
}
var page = pageFactory.Create(pageNumber, pageNode.NodeDictionary, pageTreeMembers, isLenientParsing);
return(page);
}
public bool FindPage(DictionaryToken currentPageDictionary, int soughtPageNumber, List <int> pageNumbersObserved, PageTreeMembers pageTreeMembers)
{
var type = currentPageDictionary.GetNameOrDefault(NameToken.Type);
if (type?.Equals(NameToken.Page) == true)
{
var pageNumber = GetNextPageNumber(pageNumbersObserved);
bool found = pageNumber == soughtPageNumber;
locatedPages[pageNumber] = currentPageDictionary;
pageNumbersObserved.Add(pageNumber);
return(found);
}
if (type?.Equals(NameToken.Pages) != true)
{
log.Warn("Did not find the expected type (Page or Pages) in dictionary: " + currentPageDictionary);
return(false);
}
if (currentPageDictionary.TryGet(NameToken.MediaBox, out var token))
{
var mediaBox = DirectObjectFinder.Get <ArrayToken>(token, pdfScanner);
pageTreeMembers.MediaBox = new MediaBox(mediaBox.ToRectangle());
}
if (currentPageDictionary.TryGet(NameToken.Rotate, pdfScanner, out NumericToken rotateToken))
{
pageTreeMembers.Rotation = rotateToken.Int;
}
if (!currentPageDictionary.TryGet(NameToken.Kids, out var kids) ||
!(kids is ArrayToken kidsArray))
{
return(false);
}
pageFactory.LoadResources(currentPageDictionary, isLenientParsing);
bool childFound = false;
foreach (var kid in kidsArray.Data)
{
// todo: exit early
var child = DirectObjectFinder.Get <DictionaryToken>(kid, pdfScanner);
var thisPageMatches = FindPage(child, soughtPageNumber, pageNumbersObserved, pageTreeMembers);
if (thisPageMatches)
{
childFound = true;
break;
}
}
return(childFound);
}