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Allow /Filter value to be a indirect object. #50

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Allow /Filter value to be a indirect object. #50

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7 changes: 7 additions & 0 deletions src/PdfSharp/Pdf.Filters/Filtering.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@
// DEALINGS IN THE SOFTWARE.
#endregion

using PdfSharp.Pdf.Advanced;
using System;
using System.Diagnostics;

Expand Down Expand Up @@ -201,6 +202,12 @@ public static byte[] Decode(byte[] data, string filterName)
public static byte[] Decode(byte[] data, PdfItem filterItem)
{
byte[] result = null;
if (filterItem is PdfReference)
{
PdfReference iref = (PdfReference)filterItem;
Debug.Assert(iref.Value != null, "Indirect /Filter value is null");
filterItem = iref.Value;
}
if (filterItem is PdfName)
{
Filter filter = GetFilter(filterItem.ToString());
Expand Down