public virtual void ReadFormXObjectsWithCircularReferencesInResources()
{
// given input file contains circular reference in resources of form xobjects
// (form xobjects are nested inside each other)
String input = sourceFolder + "circularReferencesInResources.pdf";
PdfReader reader1 = new PdfReader(input);
PdfDocument inputPdfDoc1 = new PdfDocument(reader1);
PdfPage page = inputPdfDoc1.GetPage(1);
PdfResources resources = page.GetResources();
IList <PdfFormXObject> formXObjects = new List <PdfFormXObject>();
// We just try to work with resources in arbitrary way and make sure that circular reference
// doesn't block it. However it is expected that PdfResources doesn't try to "look in deep"
// and recursively resolves resources, so this test should never meet any issues.
foreach (PdfName xObjName in resources.GetResourceNames(PdfName.XObject))
{
PdfFormXObject form = resources.GetForm(xObjName);
if (form != null)
{
formXObjects.Add(form);
}
}
// ensure resources XObject entry is read correctly
NUnit.Framework.Assert.AreEqual(2, formXObjects.Count);
}
public virtual void GetNonExistentResourcesCategory()
{
PdfResources resources = new PdfResources();
ICollection <PdfName> unknownResCategory = resources.GetResourceNames(new PdfName("UnknownResCategory"));
// Assert returned value is properly functioning
PdfName randomResName = new PdfName("NonExistentResourceName");
NUnit.Framework.Assert.IsFalse(unknownResCategory.Contains(randomResName));
NUnit.Framework.Assert.IsFalse(unknownResCategory.Remove(randomResName));
NUnit.Framework.Assert.IsTrue(unknownResCategory.IsEmpty());
}
public virtual void ResourcesTest2()
{
MemoryStream baos = new MemoryStream();
PdfWriter writer = new PdfWriter(baos);
PdfDocument document = new PdfDocument(writer);
PdfPage page = document.AddNewPage();
PdfExtGState egs1 = new PdfExtGState();
PdfExtGState egs2 = new PdfExtGState();
PdfResources resources = page.GetResources();
resources.AddExtGState(egs1);
resources.AddExtGState(egs2);
document.Close();
PdfReader reader = new PdfReader(new MemoryStream(baos.ToArray()));
document = new PdfDocument(reader, new PdfWriter(new ByteArrayOutputStream()));
page = document.GetPage(1);
resources = page.GetResources();
ICollection <PdfName> names = resources.GetResourceNames();
NUnit.Framework.Assert.AreEqual(2, names.Count);
String[] expectedNames = new String[] { "Gs1", "Gs2" };
int i = 0;
foreach (PdfName name in names)
{
NUnit.Framework.Assert.AreEqual(expectedNames[i++], name.GetValue());
}
PdfExtGState egs3 = new PdfExtGState();
PdfName n3 = resources.AddExtGState(egs3);
NUnit.Framework.Assert.AreEqual("Gs3", n3.GetValue());
PdfDictionary egsResources = page.GetPdfObject().GetAsDictionary(PdfName.Resources).GetAsDictionary(PdfName
.ExtGState);
PdfObject e1 = egsResources.Get(new PdfName("Gs1"), false);
PdfName n1 = resources.AddExtGState(e1);
NUnit.Framework.Assert.AreEqual("Gs1", n1.GetValue());
PdfObject e2 = egsResources.Get(new PdfName("Gs2"));
PdfName n2 = resources.AddExtGState(e2);
NUnit.Framework.Assert.AreEqual("Gs2", n2.GetValue());
PdfObject e4 = (PdfObject)e2.Clone();
PdfName n4 = resources.AddExtGState(e4);
NUnit.Framework.Assert.AreEqual("Gs4", n4.GetValue());
document.Close();
}
