/// <summary>Removes an annotation from the page.</summary>
/// <remarks>
/// Removes an annotation from the page.
/// <br /><br />
/// NOTE: If document is tagged, PdfDocument's PdfTagStructure instance will point at annotation tag parent after method call.
/// </remarks>
/// <param name="annotation">an annotation to be removed.</param>
/// <returns>this PdfPage instance.</returns>
public virtual iText.Kernel.Pdf.PdfPage RemoveAnnotation(PdfAnnotation annotation)
{
PdfArray annots = GetAnnots(false);
if (annots != null)
{
if (annots.Contains(annotation.GetPdfObject()))
{
annots.Remove(annotation.GetPdfObject());
}
else
{
annots.Remove(annotation.GetPdfObject().GetIndirectReference());
}
if (annots.IsEmpty())
{
GetPdfObject().Remove(PdfName.Annots);
}
}
if (GetDocument().IsTagged())
{
TagTreePointer tagPointer = GetDocument().GetTagStructureContext().RemoveAnnotationTag(annotation);
if (tagPointer != null)
{
bool standardAnnotTagRole = tagPointer.GetRole().Equals(PdfName.Annot) || tagPointer.GetRole().Equals(PdfName
.Form);
if (tagPointer.GetKidsRoles().Count == 0 && standardAnnotTagRole)
{
tagPointer.RemoveTag();
}
}
}
return(this);
}
protected internal virtual bool CheckEncryption(PdfStream pdfStream)
{
if (crypto == null || crypto.IsEmbeddedFilesOnly())
{
return(false);
}
else
{
PdfObject filter = pdfStream.Get(PdfName.Filter, true);
if (filter != null)
{
if (PdfName.Crypt.Equals(filter))
{
return(false);
}
else
{
if (filter.GetObjectType() == PdfObject.ARRAY)
{
PdfArray filters = (PdfArray)filter;
if (!filters.IsEmpty() && PdfName.Crypt.Equals(filters.Get(0, true)))
{
return(false);
}
}
}
}
return(true);
}
}
private static bool OrderBranchContainsSetElements(PdfObject arrayObj, PdfArray array, int currentIndex, ICollection
<PdfIndirectReference> ocgs, PdfArray toOcgs, PdfDocument toDocument) {
if (arrayObj.IsDictionary()) {
if (ocgs.Contains(arrayObj.GetIndirectReference())) {
return true;
}
else {
if (currentIndex < (array.Size() - 1) && array.Get(currentIndex + 1).IsArray()) {
PdfArray nextArray = array.GetAsArray(currentIndex + 1);
if (!nextArray.Get(0).IsString()) {
bool result = iText.Kernel.Pdf.OcgPropertiesCopier.OrderBranchContainsSetElements(nextArray, array, currentIndex
+ 1, ocgs, toOcgs, toDocument);
if (result && toOcgs != null && !ocgs.Contains(arrayObj.GetIndirectReference())) {
// Add the OCG to the OCGs array to register the OCG in document, since it is not used
// directly in the document, but is used as a parent for the order group. If it is not added
// to the OCGs array, then the OCG will be deleted at the 3rd stage of the /Order entry coping.
toOcgs.Add(arrayObj.CopyTo(toDocument, false));
}
return result;
}
}
}
}
else {
if (arrayObj.IsArray()) {
PdfArray arrayItem = (PdfArray)arrayObj;
for (int i = 0; i < arrayItem.Size(); i++) {
PdfObject obj = arrayItem.Get(i);
if (iText.Kernel.Pdf.OcgPropertiesCopier.OrderBranchContainsSetElements(obj, arrayItem, i, ocgs, toOcgs, toDocument
)) {
return true;
}
}
if (!arrayItem.IsEmpty() && !arrayItem.Get(0).IsString()) {
if (currentIndex > 0 && array.Get(currentIndex - 1).IsDictionary()) {
PdfDictionary previousDict = (PdfDictionary)array.Get(currentIndex - 1);
return ocgs.Contains(previousDict.GetIndirectReference());
}
}
}
}
return false;
}
protected internal virtual byte[] DecodeFlateBytes(PdfStream stream, byte[] bytes)
{
PdfObject filterObject = stream.Get(PdfName.Filter);
if (filterObject == null)
{
return(bytes);
}
// check if flateDecode filter is on top
PdfName filterName;
PdfArray filtersArray = null;
if (filterObject is PdfName)
{
filterName = (PdfName)filterObject;
}
else
{
if (filterObject is PdfArray)
{
filtersArray = (PdfArray)filterObject;
filterName = filtersArray.GetAsName(0);
}
else
{
throw new PdfException(PdfException.FilterIsNotANameOrArray);
}
}
if (!PdfName.FlateDecode.Equals(filterName))
{
return(bytes);
}
// get decode params if present
PdfDictionary decodeParams;
PdfArray decodeParamsArray = null;
PdfObject decodeParamsObject = stream.Get(PdfName.DecodeParms);
if (decodeParamsObject == null)
{
decodeParams = null;
}
else
{
if (decodeParamsObject.GetObjectType() == PdfObject.DICTIONARY)
{
decodeParams = (PdfDictionary)decodeParamsObject;
}
else
{
if (decodeParamsObject.GetObjectType() == PdfObject.ARRAY)
{
decodeParamsArray = (PdfArray)decodeParamsObject;
decodeParams = decodeParamsArray.GetAsDictionary(0);
}
else
{
throw new PdfException(PdfException.DecodeParameterType1IsNotSupported).SetMessageParams(decodeParamsObject
.GetType().ToString());
}
}
}
// decode
byte[] res = FlateDecodeFilter.FlateDecode(bytes, true);
if (res == null)
{
res = FlateDecodeFilter.FlateDecode(bytes, false);
}
bytes = FlateDecodeFilter.DecodePredictor(res, decodeParams);
//remove filter and decode params
filterObject = null;
if (filtersArray != null)
{
filtersArray.Remove(0);
if (filtersArray.Size() == 1)
{
filterObject = filtersArray.Get(0);
}
else
{
if (!filtersArray.IsEmpty())
{
filterObject = filtersArray;
}
}
}
decodeParamsObject = null;
if (decodeParamsArray != null)
{
decodeParamsArray.Remove(0);
if (decodeParamsArray.Size() == 1 && decodeParamsArray.Get(0).GetObjectType() != PdfObject.NULL)
{
decodeParamsObject = decodeParamsArray.Get(0);
}
else
{
if (!decodeParamsArray.IsEmpty())
{
decodeParamsObject = decodeParamsArray;
}
}
}
if (filterObject == null)
{
stream.Remove(PdfName.Filter);
}
else
{
stream.Put(PdfName.Filter, filterObject);
}
if (decodeParamsObject == null)
{
stream.Remove(PdfName.DecodeParms);
}
else
{
stream.Put(PdfName.DecodeParms, decodeParamsObject);
}
return(bytes);
}
private static void CopyDArrayField(PdfName fieldToCopy, ICollection<PdfIndirectReference> fromOcgsToCopy,
PdfDictionary fromDict, PdfDictionary toDict, PdfDocument toDocument) {
if (fromDict.GetAsArray(fieldToCopy) == null) {
return;
}
PdfArray fromArray = fromDict.GetAsArray(fieldToCopy);
if (toDict.GetAsArray(fieldToCopy) == null) {
toDict.Put(fieldToCopy, new PdfArray());
}
PdfArray toArray = toDict.GetAsArray(fieldToCopy);
ICollection<PdfIndirectReference> toOcgsToCopy = new HashSet<PdfIndirectReference>();
foreach (PdfIndirectReference fromRef in fromOcgsToCopy) {
toOcgsToCopy.Add(fromRef.GetRefersTo().CopyTo(toDocument, false).GetIndirectReference());
}
if (PdfName.Order.Equals(fieldToCopy)) {
// Stage 1: delete all Order the entire branches from the output document in which the copied OCGs were
IList<int> removeIndex = new List<int>();
for (int i = 0; i < toArray.Size(); i++) {
PdfObject toOrderItem = toArray.Get(i);
if (iText.Kernel.Pdf.OcgPropertiesCopier.OrderBranchContainsSetElements(toOrderItem, toArray, i, toOcgsToCopy
, null, null)) {
removeIndex.Add(i);
}
}
for (int i = removeIndex.Count - 1; i > -1; i--) {
toArray.Remove(removeIndex[i]);
}
PdfArray toOcgs = toDocument.GetCatalog().GetPdfObject().GetAsDictionary(PdfName.OCProperties).GetAsArray(
PdfName.OCGs);
// Stage 2: copy all the Order the entire branches in which the copied OСGs were
for (int i = 0; i < fromArray.Size(); i++) {
PdfObject fromOrderItem = fromArray.Get(i);
if (iText.Kernel.Pdf.OcgPropertiesCopier.OrderBranchContainsSetElements(fromOrderItem, fromArray, i, fromOcgsToCopy
, toOcgs, toDocument)) {
toArray.Add(fromOrderItem.CopyTo(toDocument, false));
}
}
}
else {
// Stage 3: remove from Order OCGs not presented in the output document. When forming
// the Order dictionary in the PdfOcProperties constructor, only those OCGs that are
// in the OCProperties/OCGs array will be taken into account
if (PdfName.RBGroups.Equals(fieldToCopy)) {
// Stage 1: delete all RBGroups from the output document in which the copied OCGs were
for (int i = toArray.Size() - 1; i > -1; i--) {
PdfArray toRbGroup = (PdfArray)toArray.Get(i);
foreach (PdfObject toRbGroupItemObj in toRbGroup) {
if (toOcgsToCopy.Contains(toRbGroupItemObj.GetIndirectReference())) {
toArray.Remove(i);
break;
}
}
}
// Stage 2: copy all the RBGroups in which the copied OCGs were
foreach (PdfObject fromRbGroupObj in fromArray) {
PdfArray fromRbGroup = (PdfArray)fromRbGroupObj;
foreach (PdfObject fromRbGroupItemObj in fromRbGroup) {
if (fromOcgsToCopy.Contains(fromRbGroupItemObj.GetIndirectReference())) {
toArray.Add(fromRbGroup.CopyTo(toDocument, false));
break;
}
}
}
}
else {
// Stage 3: remove from RBGroups OCGs not presented in the output
// document (is in the PdfOcProperties#fillDictionary method)
foreach (PdfObject fromObj in fromArray) {
iText.Kernel.Pdf.OcgPropertiesCopier.AttemptToAddObjectToArray(fromOcgsToCopy, fromObj, toArray, toDocument
);
}
}
}
if (toArray.IsEmpty()) {
toDict.Remove(fieldToCopy);
}
}