public void AppendDocument(Catalog catalog, decimal version, IPdfTokenScanner tokenScanner, IReadOnlyList <int> pages)
{
IEnumerable <int> pageIndices;
if (pages == null)
{
var pagesCount = catalog.PagesDictionary.GetIntOrDefault(NameToken.Count);
if (pagesCount < 1)
{
return;
}
pageIndices = Enumerable.Range(1, pagesCount);
}
else if (pages.Count < 1)
{
return;
}
else
{
pageIndices = pages;
}
currentVersion = Math.Max(version, currentVersion);
var referencesFromDocument = new Dictionary <IndirectReference, IndirectReferenceToken>();
var currentNodeReference = context.ReserveNumberToken();
var pagesReferences = new List <IndirectReferenceToken>();
var resources = new Dictionary <string, IToken>();
bool DoesAEntryCollide(PageTreeNode node)
{
while (node != null)
{
var dictionary = node.NodeDictionary;
if (dictionary.TryGet(NameToken.Resources, tokenScanner, out DictionaryToken resourcesDictionary))
{
var nonCollidingResources = resourcesDictionary.Data.Keys.Except(resources.Keys);
if (nonCollidingResources.Count() != resourcesDictionary.Data.Count)
{
// This means that at least one of the resources collided
return(true);
}
}
/* TODO: How to handle?
* `Rotate`
* `CropBox`
* `MediaBox`
*/
// No colliding entry was found, in this node
// Keep walking up into the tree
node = node.Parent;
}
return(false);
}
void CopyEntries(PageTreeNode node)
{
while (node != null)
{
var dictionary = node.NodeDictionary;
if (dictionary.TryGet(NameToken.Resources, tokenScanner, out DictionaryToken resourcesDictionary))
{
foreach (var pair in resourcesDictionary.Data)
{
resources.Add(pair.Key, CopyToken(pair.Value, tokenScanner, referencesFromDocument));
}
}
/* TODO: How to handle?
* `Rotate`
* `CropBox`
* `MediaBox`
*/
// Keep walking up into the tree
node = node.Parent;
}
}
void CreateTree()
{
if (pagesReferences.Count < 1)
{
throw new InvalidOperationException("Pages reference should always be more than 1 when executing this function");
}
var newPagesNode = new Dictionary <NameToken, IToken>
{
{ NameToken.Type, NameToken.Pages },
{ NameToken.Kids, new ArrayToken(pagesReferences) },
{ NameToken.Count, new NumericToken(pagesReferences.Count) },
{ NameToken.Parent, rootPagesReference }
};
if (resources.Count > 0)
{
newPagesNode.Add(NameToken.Resources, DictionaryToken.With(resources));
}
var pagesDictionary = new DictionaryToken(newPagesNode);
pagesTokenReferences.Add(context.WriteToken(pagesDictionary, (int)currentNodeReference.Data.ObjectNumber));
pageCount += pagesReferences.Count;
};
foreach (var pageIndex in pageIndices)
{
var pageNode = catalog.GetPageNode(pageIndex);
if (pagesReferences.Count >= ARTIFICIAL_NODE_LIMIT || DoesAEntryCollide(pageNode))
{
CreateTree();
currentNodeReference = context.ReserveNumberToken();
pagesReferences = new List <IndirectReferenceToken>();
resources = new Dictionary <string, IToken>();
}
CopyEntries(pageNode.Parent);
pagesReferences.Add(CopyPageNode(pageNode, currentNodeReference, tokenScanner, referencesFromDocument));
}
if (pagesReferences.Count < 1)
{
throw new InvalidOperationException("Pages reference couldn't be less than 1 because we have reserved a indirect reference token");
}
CreateTree();
}
public DocumentMerger()
{
rootPagesReference = context.ReserveNumberToken();
}
public DocumentMerger(Stream baseStream)
{
context = new PdfStreamWriter(baseStream, false);
rootPagesReference = context.ReserveNumberToken();
}