/// <summary>
/// Builds a PDF document from the current content of this builder and its pages.
/// </summary>
/// <returns>The bytes of the resulting PDF document.</returns>
public byte[] Build()
{
var fontsWritten = new Dictionary <Guid, ObjectToken>();
using (var memory = new MemoryStream())
{
// Header
WriteString("%PDF-1.7", memory);
// Files with binary data should contain a 2nd comment line followed by 4 bytes with values > 127
memory.WriteText("%");
memory.WriteByte(169);
memory.WriteByte(205);
memory.WriteByte(196);
memory.WriteByte(210);
memory.WriteNewLine();
// Body
foreach (var font in fonts)
{
var fontObj = font.Value.FontProgram.WriteFont(font.Value.FontKey.Name, memory, context);
fontsWritten.Add(font.Key, fontObj);
}
foreach (var image in images)
{
var streamToken = new StreamToken(image.Value.StreamDictionary, image.Value.StreamData);
context.WriteObject(memory, streamToken, image.Value.ObjectNumber);
}
var procSet = new List <NameToken>
{
NameToken.Create("PDF"),
NameToken.Text,
NameToken.ImageB,
NameToken.ImageC,
NameToken.ImageI
};
var resources = new Dictionary <NameToken, IToken>
{
{ NameToken.ProcSet, new ArrayToken(procSet) }
};
if (fontsWritten.Count > 0)
{
var fontsDictionary = new DictionaryToken(fontsWritten.Select(x => (fonts[x.Key].FontKey.Name, (IToken) new IndirectReferenceToken(x.Value.Number)))
.ToDictionary(x => x.Item1, x => x.Item2));
var fontsDictionaryRef = context.WriteObject(memory, fontsDictionary);
resources.Add(NameToken.Font, new IndirectReferenceToken(fontsDictionaryRef.Number));
}
var reserved = context.ReserveNumber();
var parentIndirect = new IndirectReferenceToken(new IndirectReference(reserved, 0));
var pageReferences = new List <IndirectReferenceToken>();
foreach (var page in pages)
{
var individualResources = new Dictionary <NameToken, IToken>(resources);
var pageDictionary = new Dictionary <NameToken, IToken>
{
{ NameToken.Type, NameToken.Page },
{ NameToken.MediaBox, RectangleToArray(page.Value.PageSize) },
{ NameToken.Parent, parentIndirect }
};
if (page.Value.Resources.Count > 0)
{
foreach (var kvp in page.Value.Resources)
{
// TODO: combine resources if value is dictionary or array, otherwise overwrite.
individualResources[kvp.Key] = kvp.Value;
}
}
pageDictionary[NameToken.Resources] = new DictionaryToken(individualResources);
if (page.Value.Operations.Count > 0)
{
var contentStream = WriteContentStream(page.Value.Operations);
var contentStreamObj = context.WriteObject(memory, contentStream);
pageDictionary[NameToken.Contents] = new IndirectReferenceToken(contentStreamObj.Number);
}
var pageRef = context.WriteObject(memory, new DictionaryToken(pageDictionary));
pageReferences.Add(new IndirectReferenceToken(pageRef.Number));
}
var pagesDictionaryData = new Dictionary <NameToken, IToken>
{
{ NameToken.Type, NameToken.Pages },
{ NameToken.Kids, new ArrayToken(pageReferences) },
{ NameToken.Count, new NumericToken(pageReferences.Count) }
};
var pagesDictionary = new DictionaryToken(pagesDictionaryData);
var pagesRef = context.WriteObject(memory, pagesDictionary, reserved);
var catalogDictionary = new Dictionary <NameToken, IToken>
{
{ NameToken.Type, NameToken.Catalog },
{ NameToken.Pages, new IndirectReferenceToken(pagesRef.Number) }
};
if (ArchiveStandard != PdfAStandard.None)
{
Func <IToken, ObjectToken> writerFunc = x => context.WriteObject(memory, x);
PdfABaselineRuleBuilder.Obey(catalogDictionary, writerFunc, DocumentInformation, ArchiveStandard);
switch (ArchiveStandard)
{
case PdfAStandard.A1A:
PdfA1ARuleBuilder.Obey(catalogDictionary);
break;
case PdfAStandard.A2B:
break;
case PdfAStandard.A2A:
PdfA1ARuleBuilder.Obey(catalogDictionary);
break;
}
}
var catalog = new DictionaryToken(catalogDictionary);
var catalogRef = context.WriteObject(memory, catalog);
var informationReference = default(IndirectReference?);
if (IncludeDocumentInformation)
{
var informationDictionary = DocumentInformation.ToDictionary();
if (informationDictionary.Count > 0)
{
var dictionary = new DictionaryToken(informationDictionary);
informationReference = context.WriteObject(memory, dictionary).Number;
}
}
TokenWriter.WriteCrossReferenceTable(context.ObjectOffsets, catalogRef, memory, informationReference);
return(memory.ToArray());
}
}
private void CompleteDocument()
{
// write fonts to reserved object numbers
foreach (var font in fonts)
{
font.Value.FontProgram.WriteFont(context, font.Value.FontKey.Reference);
}
const int desiredLeafSize = 25; // allow customization at some point?
var numLeafs = (int)Math.Ceiling(Decimal.Divide(Pages.Count, desiredLeafSize));
var leafRefs = new List <IndirectReferenceToken>();
var leafChildren = new List <List <IndirectReferenceToken> >();
var leafs = new List <Dictionary <NameToken, IToken> >();
for (var i = 0; i < numLeafs; i++)
{
leafs.Add(new Dictionary <NameToken, IToken>()
{
{ NameToken.Type, NameToken.Pages },
});
leafChildren.Add(new List <IndirectReferenceToken>());
leafRefs.Add(context.ReserveObjectNumber());
}
int leafNum = 0;
foreach (var page in pages)
{
var pageDictionary = page.Value.pageDictionary;
pageDictionary[NameToken.Type] = NameToken.Page;
pageDictionary[NameToken.Parent] = leafRefs[leafNum];
pageDictionary[NameToken.ProcSet] = DefaultProcSet;
if (!pageDictionary.ContainsKey(NameToken.MediaBox))
{
pageDictionary[NameToken.MediaBox] = RectangleToArray(page.Value.PageSize);
}
// Adobe Acrobat errors if content streams ref'd by multiple pages, turn off
// dedup if on to avoid issues
var prev = context.AttemptDeduplication;
context.AttemptDeduplication = false;
var toWrite = page.Value.contentStreams.Where(x => x.HasContent).ToList();
if (toWrite.Count == 0)
{
pageDictionary[NameToken.Contents] = new PdfPageBuilder.DefaultContentStream().Write(context);
}
else if (toWrite.Count == 1)
{
// write single
pageDictionary[NameToken.Contents] = toWrite[0].Write(context);
}
else
{
// write array
var streams = new List <IToken>();
foreach (var stream in toWrite)
{
streams.Add(stream.Write(context));
}
pageDictionary[NameToken.Contents] = new ArrayToken(streams);
}
context.AttemptDeduplication = prev;;
leafChildren[leafNum].Add(context.WriteToken(new DictionaryToken(pageDictionary)));
if (leafChildren[leafNum].Count >= desiredLeafSize)
{
leafNum += 1;
}
}
var dummyName = NameToken.Create("ObjIdToUse");
for (var i = 0; i < leafs.Count; i++)
{
leafs[i][NameToken.Kids] = new ArrayToken(leafChildren[i]);
leafs[i][NameToken.Count] = new NumericToken(leafChildren[i].Count);
leafs[i][dummyName] = leafRefs[i];
}
var catalogDictionary = new Dictionary <NameToken, IToken>
{
{ NameToken.Type, NameToken.Catalog },
};
if (leafs.Count == 1)
{
var leaf = leafs[0];
var id = leaf[dummyName] as IndirectReferenceToken;
leaf.Remove(dummyName);
catalogDictionary[NameToken.Pages] = context.WriteToken(new DictionaryToken(leaf), id);
}
else
{
var rootPageInfo = CreatePageTree(leafs, null);
catalogDictionary[NameToken.Pages] = rootPageInfo.Ref;
}
if (ArchiveStandard != PdfAStandard.None)
{
Func <IToken, IndirectReferenceToken> writerFunc = x => context.WriteToken(x);
PdfABaselineRuleBuilder.Obey(catalogDictionary, writerFunc, DocumentInformation, ArchiveStandard);
switch (ArchiveStandard)
{
case PdfAStandard.A1A:
PdfA1ARuleBuilder.Obey(catalogDictionary);
break;
case PdfAStandard.A2B:
break;
case PdfAStandard.A2A:
PdfA1ARuleBuilder.Obey(catalogDictionary);
break;
}
}
var catalog = new DictionaryToken(catalogDictionary);
var catalogRef = context.WriteToken(catalog);
var informationReference = default(IndirectReferenceToken);
if (IncludeDocumentInformation)
{
var informationDictionary = DocumentInformation.ToDictionary();
if (informationDictionary.Count > 0)
{
var dictionary = new DictionaryToken(informationDictionary);
informationReference = context.WriteToken(dictionary);
}
}
context.CompletePdf(catalogRef, informationReference);
completed = true;
(int Count, IndirectReferenceToken Ref) CreatePageTree(List <Dictionary <NameToken, IToken> > pagesNodes, IndirectReferenceToken parent)
{
// TODO shorten page tree when there is a single or small number of pages left in a branch
var count = 0;
var thisObj = context.ReserveObjectNumber();
var children = new List <IndirectReferenceToken>();
if (pagesNodes.Count > desiredLeafSize)
{
var currentTreeDepth = (int)Math.Ceiling(Math.Log(pagesNodes.Count, desiredLeafSize));
var perBranch = (int)Math.Ceiling(Math.Pow(desiredLeafSize, currentTreeDepth - 1));
var branches = (int)Math.Ceiling(decimal.Divide(pagesNodes.Count, (decimal)perBranch));
for (var i = 0; i < branches; i++)
{
var part = pagesNodes.Skip(i * perBranch).Take(perBranch).ToList();
var result = CreatePageTree(part, thisObj);
count += result.Count;
children.Add(result.Ref);
}
}
else
{
foreach (var page in pagesNodes)
{
page[NameToken.Parent] = thisObj;
var id = page[dummyName] as IndirectReferenceToken;
page.Remove(dummyName);
count += (page[NameToken.Count] as NumericToken).Int;
children.Add(context.WriteToken(new DictionaryToken(page), id));
}
}
var node = new Dictionary <NameToken, IToken>
{
{ NameToken.Type, NameToken.Pages },
{ NameToken.Kids, new ArrayToken(children) },
{ NameToken.Count, new NumericToken(count) }
};
if (parent != null)
{
node[NameToken.Parent] = parent;
}
return(count, context.WriteToken(new DictionaryToken(node), thisObj));
}
}
