/// <summary>
/// Sets the color to the specified key.
/// </summary>
/// <param name="elements">The elements.</param>
/// <param name="key">The key.</param>
/// <param name="color">The color.</param>
public static void SetColor(this PdfDictionary.DictionaryElements elements, string key, XColor color)
{
if (elements == null) { throw new ArgumentNullException("elements"); }
if (!string.IsNullOrEmpty(key))
{
var arr = new PdfArray();
arr.Elements.Add(new PdfReal(color.R / (double)byte.MaxValue));
arr.Elements.Add(new PdfReal(color.G / (double)byte.MaxValue));
arr.Elements.Add(new PdfReal(color.B / (double)byte.MaxValue));
elements[key] = arr;
}
}
internal PdfContents(PdfArray array)
: base(array)
{
int count = Elements.Count;
for (int idx = 0; idx < count; idx++)
{
// Convert the references from PdfDictionary to PdfContent
PdfItem item = Elements[idx];
PdfReference iref = item as PdfReference;
if (iref != null && iref.Value is PdfDictionary)
{
// The following line is correct!
new PdfContent((PdfDictionary)iref.Value);
}
else
throw new InvalidOperationException("Unexpected item in a content stream array.");
}
}
/// <summary>
/// Replaces the page tree by a flat array of indirect references to the pages objects.
/// </summary>
internal void FlattenPageTree()
{
// Acrobat creates a balanced tree if the number of pages is rougly more than ten. This is
// not difficult but obviously also not necessary. I created a document with 50000 pages with
// PDF4NET and Acrobat opened it in less than 2 seconds.
//PdfReference xrefRoot = this.Document.Catalog.Elements[PdfCatalog.Keys.Pages] as PdfReference;
//PdfDictionary[] pages = GetKids(xrefRoot, null);
// Promote inheritable values down the page tree
PdfPage.InheritedValues values = new PdfPage.InheritedValues();
PdfPage.InheritValues(this, ref values);
PdfDictionary[] pages = GetKids(Reference, values, null);
// Replace /Pages in catalog by this object
// xrefRoot.Value = this;
PdfArray array = new PdfArray(Owner);
foreach (PdfDictionary page in pages)
{
// Fix the parent
page.Elements[PdfPage.Keys.Parent] = Reference;
array.Elements.Add(page.Reference);
}
Elements.SetName(Keys.Type, "/Pages");
#if true
// direct array
Elements.SetValue(Keys.Kids, array);
#else
// incdirect array
this.Document.xrefTable.Add(array);
Elements.SetValue(Keys.Kids, array.XRef);
#endif
Elements.SetInteger(Keys.Count, array.Elements.Count);
}
private static Dictionary <string, string> GetFieldsFromPDF(PdfDocument FormDocument)
{
Dictionary <string, string> dictPDFFields = new Dictionary <string, string>();
if (FormDocument == null || FormDocument.AcroForm == null)
{
throw new Exception("No PDF with fillable form submitted");
}
PdfAcroForm af = FormDocument.AcroForm;
foreach (string key in af.Fields.Names)
{
try {
var field = af.Fields[key];
if (field is PdfTextField)
{
dictPDFFields.Add(key, ((PdfTextField)field).Text);
}
else if (field is PdfCheckBoxField)
{
dictPDFFields.Add(key, ((PdfCheckBoxField)field).Checked.ToString());
}
else if (field is PdfSignatureField)
{
dictPDFFields.Add(key, ""); //Leave empty since we just do image filling
}
else if (field is PdfComboBoxField)
{
if (((PdfComboBoxField)field).Value is PdfString)
{
dictPDFFields.Add(key, (((PdfComboBoxField)field).Value as PdfString).Value);
}
else
{
dictPDFFields.Add(key, ((PdfComboBoxField)field).Value?.ToString());
}
}
else if (field is PdfRadioButtonField)
{
dictPDFFields.Add(key, ((PdfRadioButtonField)field).Value?.ToString());
}
else if (field is PdfListBoxField)
{
PdfListBoxField pl = (PdfListBoxField)field;
string values = "";
if (pl.Value is PdfArray)
{
PdfSharp.Pdf.PdfArray pa = (PdfSharp.Pdf.PdfArray)pl.Value;
foreach (PdfString pi in pa.Elements.Items)
{
if (values.Length > 0)
{
values += ",";
}
values += pi.Value;
}
}
else
{
values = pl.Value.ToString();
}
dictPDFFields.Add(key, values);
}
else
{
dictPDFFields.Add(key, "Unsupported Type");
}
} catch (Exception e) {
throw new Exception("Scan of Field '" + key + " failed. " + e.Message);
}
}
return(dictPDFFields);
}
/// <summary>
/// Encrypts an array.
/// </summary>
void EncryptArray(PdfArray array)
{
int count = array.Elements.Count;
for (int idx = 0; idx < count; idx++)
{
PdfItem item = array.Elements[idx];
PdfString value1;
PdfDictionary value2;
PdfArray value3;
if ((value1 = item as PdfString) != null)
EncryptString(value1);
else if ((value2 = item as PdfDictionary) != null)
EncryptDictionary(value2);
else if ((value3 = item as PdfArray) != null)
EncryptArray(value3);
}
}
/// <summary>
/// Initializes a new instance from an existing dictionary. Used for object type transformation.
/// </summary>
/// <param name="array">The array.</param>
protected PdfArray(PdfArray array)
: base(array)
{
if (array.elements != null)
array.elements.SetOwner(this);
}
/// <summary>
/// Inserts pages of the specified document into this document.
/// </summary>
/// <param name="index">The index in this document where to insert the page .</param>
/// <param name="document">The document to be inserted.</param>
/// <param name="startIndex">The index of the first page to be inserted.</param>
/// <param name="pageCount">The number of pages to be inserted.</param>
public void InsertRange(int index, PdfDocument document, int startIndex, int pageCount)
{
// @PDF/UA
if (document == null)
{
throw new ArgumentNullException("document");
}
if (index < 0 || index > Count)
{
throw new ArgumentOutOfRangeException("index", "Argument 'index' out of range.");
}
int importDocumentPageCount = document.PageCount;
if (startIndex < 0 || startIndex + pageCount > importDocumentPageCount)
{
throw new ArgumentOutOfRangeException("startIndex", "Argument 'startIndex' out of range.");
}
if (pageCount > importDocumentPageCount)
{
throw new ArgumentOutOfRangeException("pageCount", "Argument 'pageCount' out of range.");
}
PdfPage[] insertPages = new PdfPage[pageCount];
PdfPage[] importPages = new PdfPage[pageCount];
// 1st create all new pages.
for (int idx = 0, insertIndex = index, importIndex = startIndex;
importIndex < startIndex + pageCount;
idx++, insertIndex++, importIndex++)
{
PdfPage importPage = document.Pages[importIndex];
PdfPage page = ImportExternalPage(importPage);
insertPages[idx] = page;
importPages[idx] = importPage;
Owner._irefTable.Add(page);
// Add page substitute to importedObjectTable.
PdfImportedObjectTable importedObjectTable = Owner.FormTable.GetImportedObjectTable(importPage);
importedObjectTable.Add(importPage.ObjectID, page.Reference);
PagesArray.Elements.Insert(insertIndex, page.Reference);
if (Owner.Settings.TrimMargins.AreSet)
{
page.TrimMargins = Owner.Settings.TrimMargins;
}
}
Elements.SetInteger(Keys.Count, PagesArray.Elements.Count);
// 2nd copy link annotations that are in the range of the imported pages.
for (int idx = 0, importIndex = startIndex;
importIndex < startIndex + pageCount;
idx++, importIndex++)
{
PdfPage importPage = document.Pages[importIndex];
PdfPage page = insertPages[idx];
// Get annotations.
PdfArray annots = importPage.Elements.GetArray(PdfPage.Keys.Annots);
if (annots != null)
{
PdfAnnotations annotations = new PdfAnnotations(Owner);
// Loop through annotations.
int count = annots.Elements.Count;
for (int idxAnnotation = 0; idxAnnotation < count; idxAnnotation++)
{
PdfDictionary annot = annots.Elements.GetDictionary(idxAnnotation);
if (annot != null)
{
string subtype = annot.Elements.GetString(PdfAnnotation.Keys.Subtype);
if (subtype == "/Link")
{
bool addAnnotation = false;
PdfLinkAnnotation newAnnotation = new PdfLinkAnnotation(Owner);
PdfName[] importAnnotationKeyNames = annot.Elements.KeyNames;
foreach (PdfName pdfItem in importAnnotationKeyNames)
{
PdfItem impItem;
switch (pdfItem.Value)
{
case "/BS":
newAnnotation.Elements.Add("/BS", new PdfLiteral("<</W 0>>"));
break;
case "/F": // /F 4
impItem = annot.Elements.GetValue("/F");
Debug.Assert(impItem is PdfInteger);
newAnnotation.Elements.Add("/F", impItem.Clone());
break;
case "/Rect": // /Rect [68.6 681.08 145.71 702.53]
impItem = annot.Elements.GetValue("/Rect");
Debug.Assert(impItem is PdfArray);
newAnnotation.Elements.Add("/Rect", impItem.Clone());
break;
case "/StructParent": // /StructParent 3
impItem = annot.Elements.GetValue("/StructParent");
Debug.Assert(impItem is PdfInteger);
newAnnotation.Elements.Add("/StructParent", impItem.Clone());
break;
case "/Subtype": // Already set.
break;
case "/Dest": // /Dest [30 0 R /XYZ 68 771 0]
impItem = annot.Elements.GetValue("/Dest");
impItem = impItem.Clone();
// Is value an array with 5 elements where the first one is an iref?
PdfArray destArray = impItem as PdfArray;
if (destArray != null && destArray.Elements.Count == 5)
{
PdfReference iref = destArray.Elements[0] as PdfReference;
if (iref != null)
{
iref = RemapReference(insertPages, importPages, iref);
if (iref != null)
{
destArray.Elements[0] = iref;
newAnnotation.Elements.Add("/Dest", destArray);
addAnnotation = true;
}
}
}
break;
default:
#if DEBUG_
Debug - Break.Break(true);
#endif
break;
}
}
// Add newAnnotations only it points to an imported page.
if (addAnnotation)
{
annotations.Add(newAnnotation);
}
}
}
}
// At least one link annotation found?
if (annotations.Count > 0)
{
//Owner._irefTable.Add(annotations);
page.Elements[PdfPage.Keys.Annots] = annotations;
}
}
}
// @PDF/UA: Pages were imported.
if (_document._uaManager != null)
{
_document.Events.OnPageAdded(_document, new PageEventArgs {
EventType = PageEventType.Imported
});
}
}
PdfArray CreateArray(Type type, PdfArray oldArray)
{
ConstructorInfo ctorInfo;
PdfArray array;
if (oldArray == null)
{
// Use contstructor with signature 'Ctor(PdfDocument owner)'.
ctorInfo = type.GetConstructor(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic,
null, new Type[] { typeof(PdfDocument) }, null);
Debug.Assert(ctorInfo != null, "No appropriate constructor found for type: " + type.Name);
array = ctorInfo.Invoke(new object[] { this.owner.Owner }) as PdfArray;
}
else
{
// Use contstructor with signature 'Ctor(PdfDictionary dict)'.
ctorInfo = type.GetConstructor(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic,
null, new Type[] { typeof(PdfArray) }, null);
Debug.Assert(ctorInfo != null, "No appropriate constructor found for type: " + type.Name);
array = ctorInfo.Invoke(new object[] { oldArray }) as PdfArray;
}
return array;
}
public PdfArray ReadArray(PdfArray array, bool includeReferences)
{
Debug.Assert(Symbol == Symbol.BeginArray);
if (array == null)
array = new PdfArray(this.document);
int sp = this.stack.SP;
ParseObject(Symbol.EndArray);
int count = this.stack.SP - sp;
PdfItem[] items = this.stack.ToArray(sp, count);
this.stack.Reduce(count);
for (int idx = 0; idx < count; idx++)
{
PdfItem val = items[idx];
if (includeReferences && val is PdfReference)
val = ReadReference((PdfReference)val, includeReferences);
array.Elements.Add(val);
}
return array;
}
// Write labels to the PDF
internal void WriteLabels ()
{
if (!edited) {
return;
}
// Grab the labels element, creating it if necessary
PdfDictionary labels_dict;
if (!pdf_elements.ContainsKey (name_labels)) {
labels_dict = new PdfDictionary (pdf_document);
pdf_elements.Add (name_labels, labels_dict);
} else {
labels_dict = pdf_elements.GetDictionary (name_labels);
}
labels_dict.Elements.Clear ();
// Create the number tree
PdfArray number_tree = new PdfArray (pdf_document);
// Add the range-start, attrib-dict pairs
foreach (int range_start in page_labels.Keys)
{
number_tree.Elements.Add (new PdfInteger (range_start));
PageLabelFormat label_format = page_labels[range_start];
PdfDictionary r_attribs = new PdfDictionary (pdf_document);
if (label_format.number_style.Length > 0) {
r_attribs.Elements.Add (name_fmt, new PdfName (label_format.number_style));
}
if (label_format.first_number > 1) {
r_attribs.Elements.Add (name_start_at, new PdfInteger (label_format.first_number));
}
if (label_format.prefix.Length > 0) {
r_attribs.Elements.Add (name_prefix, new PdfString (label_format.prefix));
}
number_tree.Elements.Add (r_attribs);
}
labels_dict.Elements.Add (name_numtree, number_tree);
}
static void Main(string[] args)
{
// Get a fresh copy of the sample PDF file
string filename = "Portable Document Format.pdf";
File.Copy(Path.Combine("../../../../../PDFs/", filename),
Path.Combine(Directory.GetCurrentDirectory(), filename), true);
// Read document into memory for modification
PdfDocument document = PdfReader.Open(filename);
// The current version of PDFsharp doesn't support the concept of
// 'actions'. Actions will come in a future version, but if you need them
// now, you can have them 'handmade'.
//
// This sample works on PDF objects directly, therefore some knowledge of
// the structure of PDF is required.
// If you are not familiar with the portable document format, first read
// at least chapter 3 in Adobe's PDF Reference
// (http://partners.adobe.com/public/developer/pdf/index_reference.html).
// If you can read German, I recommend chapter 12 of 'Die PostScript &
// PDF-Bibel', a much more interesting reading than the bone-dry Adobe
// books (http://www.pdflib.com/de/produkte/mehr/bibel/index.html).
//
// The sample task is to add an 'open action' to the document so that it
// starts with the content of page 3 magnified just enough to fit the
// height of the page within the window.
// First we have to create a new dictionary that defines the action.
PdfDictionary dict = new PdfDictionary(document);
// According to the PDF Reference the dictionary requires two elements.
// A key /S that specifies the 'GoTo' action,
// and a key /D that describes the destination.
// Adding a name as value of key /S is easy.
dict.Elements["/S"] = new PdfName("/GoTo");
// The destination is described by an array.
PdfArray array = new PdfArray(document);
// Set the array as the value of key /D.
// This makes the array a direct object of the dictionary.
dict.Elements["/D"] = array;
// Now add the elements to the array. According to the PDF Reference it
// must be three for a page as the target of a 'GoTo' action.
// The first element is an indirect reference to the destination page.
// To add an indirect reference to the page three, we first need the
// PdfReference object of that page.
// (The index in the Pages collection is zero based, therefore Pages[2])
PdfReference iref = PdfInternals.GetReference(document.Pages[2]);
// Add the reference to the third page as the first array element.
// Adding the iref (instead of the PdfPage object itself) makes it an
// indirect reference.
array.Elements.Add(iref);
// The second element is the name /FitV to indicate 'fit vertically'.
array.Elements.Add(new PdfName("/FitV"));
// /FitV requires the horizontal coordinate that will be positioned at the
// left edge of the window. We set -32768 because Acrobat uses this value
// to show the full page (it means 'left aligned' anyway if the window is
// so small that a horizontal scroll bar is required).
array.Elements.Add(new PdfInteger(-32768));
// Now that the action dictionary is complete, we can add it to the
// document's object table.
// Adding an object to the object table makes it an indirect object.
document.Internals.AddObject(dict);
// Finally we must add the action dictionary to the /OpenAction key of
// the document's catalog as an indirect value.
document.Internals.Catalog.Elements["/OpenAction"] =
PdfInternals.GetReference(dict);
// Using PDFsharp we never deal with object numbers. We simply put the
// objects together and the PDFsharp framework does the rest.
// Save the document...
document.Save(filename);
// ...and start a viewer.
Process.Start(filename);
}
PdfDictionary BuildShadingFunction3(GradientStopCollection gradients, bool softMask, PdfColorMode colorMode)
{
int count = gradients.Count;
Debug.Assert(count >= 2);
// // Build a Type 3 function with an array of n-1 Type 2 functions
PdfDictionary fn1 = new PdfDictionary();
fn1.Elements["/FunctionType"] = new PdfInteger(3); // Type 3 - Stitching Function
fn1.Elements["/Domain"] = new PdfLiteral("[0 1]");
fn1.Elements["/Range"] = new PdfLiteral("[0 1 0 1 0 1]");
PdfArray fnarray = new PdfArray();
fn1.Elements["/Functions"] = fnarray;
StringBuilder bounds = new StringBuilder("[");
StringBuilder encode = new StringBuilder("[");
for (int idx = 1; idx < count; idx++)
{
PdfDictionary fn2 = new PdfDictionary();
fn2.Elements["/FunctionType"] = new PdfInteger(2);
Color clr0 = gradients[idx - 1].Color;
Color clr1 = gradients[idx].Color;
if (softMask)
{
fn2.Elements["/C0"] = new PdfLiteral("[" + PdfEncoders.ToString(clr0.ScA) + "]");
fn2.Elements["/C1"] = new PdfLiteral("[" + PdfEncoders.ToString(clr1.ScA) + "]");
fn2.Elements["/Range"] = new PdfLiteral("[0 1]");
}
else
{
fn2.Elements["/C0"] = new PdfLiteral("[" + PdfEncoders.ToString(clr0, colorMode) + "]");
fn2.Elements["/C1"] = new PdfLiteral("[" + PdfEncoders.ToString(clr1, colorMode) + "]");
fn2.Elements["/Range"] = new PdfLiteral("[0 1 0 1 0 1]");
}
fn2.Elements["/Domain"] = new PdfLiteral("[0 1]");
fn2.Elements["/N"] = new PdfInteger(1);
fnarray.Elements.Add(fn2);
if (idx > 1)
{
bounds.Append(' ');
encode.Append(' ');
}
if (idx < count - 1)
bounds.Append(PdfEncoders.ToString(gradients[idx].Offset));
encode.Append("0 1");
}
bounds.Append(']');
encode.Append(']');
fn1.Elements["/Bounds"] = new PdfLiteral(bounds.ToString());
fn1.Elements["/Encode"] = new PdfLiteral(encode.ToString());
return fn1;
}
/// <summary>
/// Builds the shading function of the specified gradient stop collection.
/// </summary>
protected PdfDictionary BuildShadingFunction(GradientStopCollection gradients, bool softMask, PdfColorMode colorMode, bool reverse, out PdfDictionary funcReverse)
{
PdfDictionary func = new PdfDictionary();
int count = gradients.Count;
Debug.Assert(count >= 2);
if (CanOptimizeForTwoColors(gradients))
{
funcReverse = null;
// Build a Type 3 function with an array of 2 Type 2 functions
func.Elements["/FunctionType"] = new PdfInteger(3); // Type 3 - Stitching Function
func.Elements["/Domain"] = new PdfLiteral("[0 1]");
PdfArray fnarray = new PdfArray();
func.Elements["/Functions"] = fnarray;
StringBuilder bounds = new StringBuilder("[");
StringBuilder encode = new StringBuilder("[");
for (int idx = 1; idx < count; idx++)
{
PdfDictionary fn2 = new PdfDictionary();
fn2.Elements["/FunctionType"] = new PdfInteger(2);
Color clr0 = gradients[idx - 1].Color;
Color clr1 = gradients[idx].Color;
if (softMask)
{
fn2.Elements["/C0"] = new PdfLiteral("[" + PdfEncoders.ToString(clr0.ScA) + "]");
fn2.Elements["/C1"] = new PdfLiteral("[" + PdfEncoders.ToString(clr1.ScA) + "]");
fn2.Elements["/Range"] = new PdfLiteral("[0 1]");
}
else
{
fn2.Elements["/C0"] = new PdfLiteral("[" + PdfEncoders.ToString(clr0, colorMode) + "]");
fn2.Elements["/C1"] = new PdfLiteral("[" + PdfEncoders.ToString(clr1, colorMode) + "]");
fn2.Elements["/Range"] = new PdfLiteral("[0 1 0 1 0 1]");
}
fn2.Elements["/Domain"] = new PdfLiteral("[0 1]");
fn2.Elements["/N"] = new PdfInteger(1);
fnarray.Elements.Add(fn2);
if (idx > 1)
{
bounds.Append(' ');
encode.Append(' ');
}
if (idx < count - 1)
bounds.Append(PdfEncoders.ToString(gradients[idx].Offset));
encode.Append(reverse ? "1 0" : "0 1");
}
bounds.Append(']');
encode.Append(']');
func.Elements["/Bounds"] = new PdfLiteral(bounds.ToString());
func.Elements["/Encode"] = new PdfLiteral(encode.ToString());
}
else
{
#if true
funcReverse = BuildShadingFunction3(gradients, softMask, colorMode);
Context.PdfDocument.Internals.AddObject(funcReverse);
func.Elements["/FunctionType"] = new PdfInteger(3); // Type 3 - Stitching Function
func.Elements["/Domain"] = new PdfLiteral("[0 1]");
func.Elements["/Encode"] = new PdfLiteral("[1 0]");
func.Elements["/Bounds"] = new PdfLiteral("[]");
func.Elements["/Range"] = new PdfLiteral("[0 1 0 1 0 1]");
PdfArray fnarray0 = new PdfArray();
fnarray0.Elements.Add(funcReverse);
func.Elements["/Functions"] = fnarray0;
#else
// // Build a Type 3 function with an array of n-1 Type 2 functions
PdfDictionary fn1 = new PdfDictionary();
func.Elements["/FunctionType"] = new PdfInteger(3); // Type 3 - Stitching Function
func.Elements["/Domain"] = new PdfLiteral("[0 1]");
func.Elements["/Encode"] = new PdfLiteral("[1 0]");
func.Elements["/Bounds"] = new PdfLiteral("[]");
func.Elements["/Range"] = new PdfLiteral("[0 1 0 1 0 1]");
PdfArray fnarray0 = new PdfArray();
fnarray0.Elements.Add(fn1);
func.Elements["/Functions"] = fnarray0;
fn1.Elements["/FunctionType"] = new PdfInteger(3); // Type 3 - Stitching Function
fn1.Elements["/Domain"] = new PdfLiteral("[0 1]");
fn1.Elements["/Range"] = new PdfLiteral("[0 1 0 1 0 1]");
PdfArray fnarray = new PdfArray();
fn1.Elements["/Functions"] = fnarray;
StringBuilder bounds = new StringBuilder("[");
StringBuilder encode = new StringBuilder("[");
for (int idx = 1; idx < count; idx++)
{
PdfDictionary fn2 = new PdfDictionary();
fn2.Elements["/FunctionType"] = new PdfInteger(2);
Color clr0 = gradients[idx - 1].Color;
Color clr1 = gradients[idx].Color;
if (softMask)
{
fn2.Elements["/C0"] = new PdfLiteral("[" + PdfEncoders.ToString(clr0.ScA) + "]");
fn2.Elements["/C1"] = new PdfLiteral("[" + PdfEncoders.ToString(clr1.ScA) + "]");
fn2.Elements["/Range"] = new PdfLiteral("[0 1]");
}
else
{
fn2.Elements["/C0"] = new PdfLiteral("[" + PdfEncoders.ToString(clr0, colorMode) + "]");
fn2.Elements["/C1"] = new PdfLiteral("[" + PdfEncoders.ToString(clr1, colorMode) + "]");
fn2.Elements["/Range"] = new PdfLiteral("[0 1 0 1 0 1]");
}
fn2.Elements["/Domain"] = new PdfLiteral("[0 1]");
fn2.Elements["/N"] = new PdfInteger(1);
//this.renderer.Owner.Internals.AddObject(fn2);
//fnarray.Elements.Add(fn2.Reference);
fnarray.Elements.Add(fn2);
if (idx > 1)
{
bounds.Append(' ');
encode.Append(' ');
}
if (idx < count - 1)
bounds.Append(PdfEncoders.ToString(gradients[idx].Offset));
encode.Append("0 1");
}
bounds.Append(']');
encode.Append(']');
fn1.Elements["/Bounds"] = new PdfLiteral(bounds.ToString());
fn1.Elements["/Encode"] = new PdfLiteral(encode.ToString());
#endif
}
return func;
}
void SplitDestinationPage(PdfArray destination) // Reference: 8.2 Destination syntax / Page 582
{
// ReSharper disable HeuristicUnreachableCode
//#pragma warning disable 162
// The destination page may not yet have been transformed to PdfPage.
PdfDictionary destPage = (PdfDictionary)((PdfReference)destination.Elements[0]).Value;
PdfPage page = destPage as PdfPage;
if (page == null)
{
page = new PdfPage(destPage);
}
DestinationPage = page;
PdfName type = destination.Elements[1] as PdfName;
if (type != null)
{
PageDestinationType = (PdfPageDestinationType)Enum.Parse(typeof(PdfPageDestinationType), type.Value.Substring(1), true);
switch (PageDestinationType)
{
// [page /XYZ left top zoom] -- left, top, and zoom can be null.
case PdfPageDestinationType.Xyz:
Left = destination.Elements.GetNullableReal(2);
Top = destination.Elements.GetNullableReal(3);
Zoom = destination.Elements.GetNullableReal(4); // For this parameter, null and 0 have the same meaning.
break;
// [page /Fit]
case PdfPageDestinationType.Fit:
// /Fit has no parameters.
break;
// [page /FitH top] -- top can be null.
case PdfPageDestinationType.FitH:
Top = destination.Elements.GetNullableReal(2);
break;
// [page /FitV left] -- left can be null.
case PdfPageDestinationType.FitV:
Left = destination.Elements.GetNullableReal(2);
break;
// [page /FitR left bottom right top] -- left, bottom, right, and top must not be null.
// TODO An exception in GetReal leads to an inconsistent document. Deal with that - e.g. by registering the corruption and preventing the user from saving the corrupted document.
case PdfPageDestinationType.FitR:
Left = destination.Elements.GetReal(2);
Bottom = destination.Elements.GetReal(3);
Right = destination.Elements.GetReal(4);
Top = destination.Elements.GetReal(5);
break;
// [page /FitB]
case PdfPageDestinationType.FitB:
// /Fit has no parameters.
break;
// [page /FitBH top] -- top can be null.
case PdfPageDestinationType.FitBH:
Top = destination.Elements.GetReal(2);
break;
// [page /FitBV left] -- left can be null.
case PdfPageDestinationType.FitBV:
Left = destination.Elements.GetReal(2);
break;
default:
throw new ArgumentOutOfRangeException();
}
}
//#pragma warning restore 162
// ReSharper restore HeuristicUnreachableCode
}
/// <summary>
/// Initializes this instance from an existing PDF document.
/// </summary>
void Initialize()
{
string title;
if (Elements.TryGetString(Keys.Title, out title))
{
Title = title;
}
PdfReference parentRef = Elements.GetReference(Keys.Parent);
if (parentRef != null)
{
PdfOutline parent = parentRef.Value as PdfOutline;
if (parent != null)
{
Parent = parent;
}
}
Count = Elements.GetInteger(Keys.Count);
PdfArray colors = Elements.GetArray(Keys.C);
if (colors != null && colors.Elements.Count == 3)
{
double r = colors.Elements.GetReal(0);
double g = colors.Elements.GetReal(1);
double b = colors.Elements.GetReal(2);
TextColor = XColor.FromArgb((int)(r * 255), (int)(g * 255), (int)(b * 255));
}
// Style directly works on dictionary element.
PdfItem dest = Elements.GetValue(Keys.Dest);
PdfItem a = Elements.GetValue(Keys.A);
Debug.Assert(dest == null || a == null, "Either destination or goto action.");
PdfArray destArray = null;
if (dest != null)
{
destArray = dest as PdfArray;
if (destArray != null)
{
SplitDestinationPage(destArray);
}
else
{
Debug.Assert(false, "See what to do when this happened.");
}
}
else if (a != null)
{
// The dictionary should be a GoTo action.
PdfDictionary action = a as PdfDictionary;
if (action != null && action.Elements.GetName(PdfAction.Keys.S) == "/GoTo")
{
dest = action.Elements[PdfGoToAction.Keys.D];
destArray = dest as PdfArray;
if (destArray != null)
{
// Replace Action with /Dest entry.
Elements.Remove(Keys.A);
Elements.Add(Keys.Dest, destArray);
SplitDestinationPage(destArray);
}
else
{
throw new Exception("Destination Array expected.");
}
}
else
{
Debug.Assert(false, "See what to do when this happened.");
}
}
else
{
// Neither destination page nor GoTo action.
}
InitializeChildren();
}
internal ArrayElements(PdfArray array)
{
_elements = new List <PdfItem>();
_ownerArray = array;
}
/// <summary>
/// Reads PDF object from input stream.
/// </summary>
/// <param name="pdfObject">Either the instance of a derived type or null. If it is null
/// an appropriate object is created.</param>
/// <param name="objectID">The address of the object.</param>
/// <param name="includeReferences">If true, specifies that all indirect objects
/// are included recursively.</param>
public PdfObject ReadObject(PdfObject pdfObject, PdfObjectID objectID, bool includeReferences)
{
MoveToObject(objectID);
int objectNumber = ReadInteger();
int generationNumber = ReadInteger();
#if DEBUG
// The following assertion sometime failed (see below)
//Debug.Assert(objectID == new PdfObjectID(objectNumber, generationNumber));
if (objectID != new PdfObjectID(objectNumber, generationNumber))
{
// A special kind of bug? Or is this an undocumented PDF feature?
// PDF4NET 2.6 provides a sample called 'Unicode', which produces a file 'unicode.pdf'
// The iref table of this file contains the following entries:
// iref
// 0 148
// 0000000000 65535 f
// 0000000015 00000 n
// 0000000346 00000 n
// ....
// 0000083236 00000 n
// 0000083045 00000 n
// 0000083045 00000 n
// 0000083045 00000 n
// 0000083045 00000 n
// 0000080334 00000 n
// ....
// Object 84, 85, 86, and 87 maps to the same dictionary, but all PDF readers I tested
// ignores this mismatch! The following assertion failed about 50 times with this file.
#if true_
string message = String.Format("xref entry {0} {1} maps to object {2} {3}.",
objectID.ObjectNumber, objectID.GenerationNumber, objectNumber, generationNumber);
Debug.Assert(false, message);
#endif
}
#endif
// Always use object ID from iref table (see above)
objectNumber = objectID.ObjectNumber;
generationNumber = objectID.GenerationNumber;
#if true_
Debug.WriteLine(String.Format("obj: {0} {1}", objectNumber, generationNumber));
#endif
ReadSymbol(Symbol.Obj);
bool checkForStream = false;
Symbol symbol = ScanNextToken();
switch (symbol)
{
case Symbol.BeginArray:
PdfArray array;
if (pdfObject == null)
array = new PdfArray(this.document);
else
array = (PdfArray)pdfObject;
//PdfObject.RegisterObject(array, objectID, generation);
pdfObject = ReadArray(array, includeReferences);
pdfObject.SetObjectID(objectNumber, generationNumber);
break;
case Symbol.BeginDictionary:
PdfDictionary dict;
if (pdfObject == null)
dict = new PdfDictionary(this.document);
else
dict = (PdfDictionary)pdfObject;
//PdfObject.RegisterObject(dict, objectID, generation);
checkForStream = true;
pdfObject = ReadDictionary(dict, includeReferences);
pdfObject.SetObjectID(objectNumber, generationNumber);
break;
// Acrobat 6 Professional proudly presents: The Null object!
// Even with a one-digit object number an indirect reference «x 0 R» to this object is
// one character larger than the direct use of «null». Probable this is the reason why
// it is true that Acrobat Web Capture 6.0 creates this object, but obviously never
// creates a reference to it!
case Symbol.Null:
pdfObject = new PdfNullObject(this.document);
pdfObject.SetObjectID(objectNumber, generationNumber);
ReadSymbol(Symbol.EndObj);
return pdfObject;
case Symbol.Boolean:
pdfObject = new PdfBooleanObject(this.document, this.lexer.Token == Boolean.TrueString);
pdfObject.SetObjectID(objectNumber, generationNumber);
ReadSymbol(Symbol.EndObj);
return pdfObject;
case Symbol.Integer:
pdfObject = new PdfIntegerObject(this.document, this.lexer.TokenToInteger);
pdfObject.SetObjectID(objectNumber, generationNumber);
ReadSymbol(Symbol.EndObj);
return pdfObject;
case Symbol.UInteger:
pdfObject = new PdfUIntegerObject(this.document, this.lexer.TokenToUInteger);
pdfObject.SetObjectID(objectNumber, generationNumber);
ReadSymbol(Symbol.EndObj);
return pdfObject;
case Symbol.Real:
pdfObject = new PdfRealObject(this.document, this.lexer.TokenToReal);
pdfObject.SetObjectID(objectNumber, generationNumber);
ReadSymbol(Symbol.EndObj);
return pdfObject;
case Symbol.String:
pdfObject = new PdfStringObject(this.document, this.lexer.Token);
pdfObject.SetObjectID(objectNumber, generationNumber);
ReadSymbol(Symbol.EndObj);
return pdfObject;
case Symbol.Name:
pdfObject = new PdfNameObject(this.document, this.lexer.Token);
pdfObject.SetObjectID(objectNumber, generationNumber);
ReadSymbol(Symbol.EndObj);
return pdfObject;
case Symbol.Keyword:
// Should not come here anymore
throw new NotImplementedException("Keyword");
default:
// Should not come here anymore
throw new NotImplementedException("unknown token");
}
symbol = ScanNextToken();
if (symbol == Symbol.BeginStream)
{
PdfDictionary dict = (PdfDictionary)pdfObject;
Debug.Assert(checkForStream, "Unexpected stream...");
int length = GetStreamLength(dict);
byte[] bytes = this.lexer.ReadStream(length);
#if true_
if (dict.Elements.GetString("/Filter") == "/FlateDecode")
{
if (dict.Elements["/Subtype"] == null)
{
try
{
byte[] decoded = Filtering.FlateDecode.Decode(bytes);
if (decoded.Length == 0)
goto End;
string pageContent = Filtering.FlateDecode.DecodeToString(bytes);
if (pageContent.Length > 100)
pageContent = pageContent.Substring(pageContent.Length - 100);
pageContent.GetType();
bytes = decoded;
dict.Elements.Remove("/Filter");
dict.Elements.SetInteger("/Length", bytes.Length);
}
catch
{
}
}
End:;
}
#endif
PdfDictionary.PdfStream stream = new PdfDictionary.PdfStream(bytes, dict);
dict.Stream = stream;
ReadSymbol(Symbol.EndStream);
symbol = ScanNextToken();
}
if (symbol != Symbol.EndObj)
throw new PdfReaderException(PSSR.UnexpectedToken(this.lexer.Token));
return pdfObject;
}
//void RealizeImageBrush(ImageBrush brush, XForm xform)
//{
//}
//void RealizeVisualBrush(VisualBrush brush, XForm xform)
//{
//}
/// <summary>
/// Builds the shading function of the specified gradient stop collection.
/// </summary>
PdfDictionary BuildShadingFunction(GradientStopCollection gradients, PdfColorMode colorMode)
{
bool softMask = this.writer.renderMode == RenderMode.SoftMask;
PdfDictionary func = new PdfDictionary();
int count = gradients.Count;
Debug.Assert(count >= 2);
if (count == 2)
{
// Build one Type 2 function
func.Elements["/FunctionType"] = new PdfInteger(2); // Type 2 - Exponential Interpolation Function
Color clr0 = gradients[0].Color;
Color clr1 = gradients[1].Color;
if (softMask)
{
clr0 = Utils.AlphaToGray(clr0);
clr1 = Utils.AlphaToGray(clr1);
}
func.Elements["/C0"] = new PdfLiteral("[" + PdfEncoders.ToString(clr0, colorMode) + "]");
func.Elements["/C1"] = new PdfLiteral("[" + PdfEncoders.ToString(clr1, colorMode) + "]");
func.Elements["/Domain"] = new PdfLiteral("[0 1]");
func.Elements["/N"] = new PdfInteger(1); // be linear
}
else
{
// Build a Type 3 function with an array of n-1 Type 2 functions
func.Elements["/FunctionType"] = new PdfInteger(3); // Type 3 - Stitching Function
func.Elements["/Domain"] = new PdfLiteral("[0 1]");
PdfArray fnarray = new PdfArray();
func.Elements["/Functions"] = fnarray;
StringBuilder bounds = new StringBuilder("[");
StringBuilder encode = new StringBuilder("[");
for (int idx = 1; idx < count; idx++)
{
PdfDictionary fn2 = new PdfDictionary();
fn2.Elements["/FunctionType"] = new PdfInteger(2);
Color clr0 = gradients[idx - 1].Color;
Color clr1 = gradients[idx].Color;
if (softMask)
{
clr0 = Utils.AlphaToGray(clr0);
clr1 = Utils.AlphaToGray(clr1);
}
fn2.Elements["/C0"] = new PdfLiteral("[" + PdfEncoders.ToString(clr0, colorMode) + "]");
fn2.Elements["/C1"] = new PdfLiteral("[" + PdfEncoders.ToString(clr1, colorMode) + "]");
fn2.Elements["/Domain"] = new PdfLiteral("[0 1]");
fn2.Elements["/N"] = new PdfInteger(1);
//this.renderer.Owner.Internals.AddObject(fn2);
//fnarray.Elements.Add(fn2.Reference);
fnarray.Elements.Add(fn2);
if (idx > 1)
{
bounds.Append(' ');
encode.Append(' ');
}
if (idx < count - 1)
bounds.Append(PdfEncoders.ToString(gradients[idx].Offset));
encode.Append("0 1");
}
bounds.Append(']');
//encode.Append(" 0 1");
encode.Append(']');
func.Elements["/Bounds"] = new PdfLiteral(bounds.ToString());
func.Elements["/Encode"] = new PdfLiteral(encode.ToString());
}
return func;
}
/// <summary>
/// Parses whatever comes until the specified stop symbol is reached.
/// </summary>
void ParseObject(Symbol stop)
{
#if DEBUG_
ParseObjectCounter++;
Debug.WriteLine(ParseObjectCounter.ToString());
if (ParseObjectCounter == 178)
GetType();
#endif
Symbol symbol;
while ((symbol = ScanNextToken()) != Symbol.Eof)
{
if (symbol == stop)
return;
switch (symbol)
{
case Symbol.Comment:
// ignore comments
break;
case Symbol.Null:
this.stack.Shift(PdfNull.Value);
break;
case Symbol.Boolean:
this.stack.Shift(new PdfBoolean(this.lexer.TokenToBoolean));
break;
case Symbol.Integer:
this.stack.Shift(new PdfInteger(this.lexer.TokenToInteger));
break;
case Symbol.UInteger:
this.stack.Shift(new PdfUInteger(this.lexer.TokenToUInteger));
break;
case Symbol.Real:
this.stack.Shift(new PdfReal(this.lexer.TokenToReal));
break;
case Symbol.String:
//this.stack.Shift(new PdfString(this.lexer.Token, PdfStringFlags.PDFDocEncoding));
this.stack.Shift(new PdfString(this.lexer.Token, PdfStringFlags.RawEncoding));
break;
case Symbol.UnicodeString:
this.stack.Shift(new PdfString(this.lexer.Token, PdfStringFlags.Unicode));
break;
case Symbol.HexString:
this.stack.Shift(new PdfString(this.lexer.Token, PdfStringFlags.HexLiteral));
break;
case Symbol.UnicodeHexString:
this.stack.Shift(new PdfString(this.lexer.Token, PdfStringFlags.Unicode | PdfStringFlags.HexLiteral));
break;
case Symbol.Name:
this.stack.Shift(new PdfName(this.lexer.Token));
break;
case Symbol.R:
{
Debug.Assert(this.stack.GetItem(-1) is PdfInteger && this.stack.GetItem(-2) is PdfInteger);
PdfObjectID objectID = new PdfObjectID(this.stack.GetInteger(-2), this.stack.GetInteger(-1));
PdfReference iref = this.document.irefTable[objectID];
if (iref == null)
{
// If a document has more than one PdfXRefTable it is possible that the first trailer has
// indirect references to objects whos iref entry is not yet read in.
if (this.document.irefTable.IsUnderConstruction)
{
// XRefTable not complete when trailer is read. Create temporary irefs that are
// removed later in PdfTrailer.FixXRefs.
iref = new PdfReference(objectID, 0);
this.stack.Reduce(iref, 2);
break;
}
// PDF Reference section 3.2.9:
// An indirect reference to an undefined object is not an error;
// it is simply treated as a reference to the null object.
this.stack.Reduce(PdfNull.Value, 2);
// Let's see what null objects are good for...
//Debug.Assert(false, "Null object detected!");
//this.stack.Reduce(PdfNull.Value, 2);
}
else
this.stack.Reduce(iref, 2);
break;
}
case Symbol.BeginArray:
PdfArray array = new PdfArray(this.document);
ReadArray(array, false);
this.stack.Shift(array);
break;
case Symbol.BeginDictionary:
PdfDictionary dict = new PdfDictionary(this.document);
ReadDictionary(dict, false);
this.stack.Shift(dict);
break;
case Symbol.BeginStream:
throw new NotImplementedException();
default:
string error = this.lexer.Token;
Debug.Assert(false, "Unexpected: " + error);
break;
}
}
throw new PdfReaderException("Unexpected end of file.");
}
internal ArrayElements(PdfArray array)
{
this.elements = new ArrayList();
this.owner = array;
}
/// <summary>
/// Retrieves the raw data for the colorspace.
/// </summary>
/// <returns>The raw data from the PdfArray of PdfReference.</returns>
protected virtual IEnumerable<byte> GetRawPalette(PdfArray array)
{
if (array == null) throw new ArgumentNullException("array", "The indexed color array was null.");
foreach(var item in array.Elements) {
var number = (item as PdfInteger);
if (number == null) yield return(0);
yield return (Convert.ToByte(number.Value));
}
}
/// <summary>
/// Moves this instance to another dictionary during object type transformation.
/// </summary>
internal void SetOwner(PdfArray array)
{
this.owner = array;
array.elements = this;
}