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AndreasGey76
PostPosted: Wed Jan 07, 2026 1:35 pm 
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Joined: Tue Jan 16, 2024 11:31 am
Posts: 15
The following error occures, when reading PDF with RunLengthDecode Filter:

System.NotImplementedException
HResult=0x80004001
Message=Filter not implemented: RunLengthDecode
Source=PdfSharp
StackTrace:
at PdfSharp.Pdf.Filters.Filtering.GetFilter(String filterName)
at PdfSharp.Pdf.Filters.Filtering.Decode(Byte[] data, PdfItem filterItem, PdfItem decodeParms)
at PdfSharp.Pdf.Filters.Filtering.Decode(Byte[] data, PdfItem filterItem, PdfItem decodeParms)
at PdfSharp.Pdf.PdfDictionary.PdfStream.get_UnfilteredValue()
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Thomas Hoevel
PostPosted: Thu Jan 08, 2026 9:07 am 
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Joined: Mon Oct 16, 2006 8:16 am
Posts: 3142
Location: Cologne, Germany
It's not a bug: PDFsharp is around since 2005 and so far we haven't seen a single file that uses RunLengthDecode.

Since you apparently have such a file, it would be nice if you would submit that file for testing.
Implement the RunLengthDecode filter should be rather simple, but it's always good to have test files.
Thanks in advance.

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Thomas Hoevel
PDFsharp Team
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AndreasGey76
PostPosted: Fri Jan 09, 2026 6:42 am 
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Joined: Tue Jan 16, 2024 11:31 am
Posts: 15
Thomas Hoevel wrote:
It's not a bug: PDFsharp is around since 2005 and so far we haven't seen a single file that uses RunLengthDecode.

Since you apparently have such a file, it would be nice if you would submit that file for testing.
Implement the RunLengthDecode filter should be rather simple, but it's always good to have test files.
Thanks in advance.


Sorry, we can't share the PDF, because it is from one of our clients.
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AndreasGey76
PostPosted: Fri Jan 30, 2026 1:56 pm 
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Joined: Tue Jan 16, 2024 11:31 am
Posts: 15
I have created an pull request, which implements RunLengthDecode: https://github.com/empira/PDFsharp/pull/334

AndreasGey76 wrote:
Thomas Hoevel wrote:
It's not a bug: PDFsharp is around since 2005 and so far we haven't seen a single file that uses RunLengthDecode.

Since you apparently have such a file, it would be nice if you would submit that file for testing.
Implement the RunLengthDecode filter should be rather simple, but it's always good to have test files.
Thanks in advance.


Sorry, we can't share the PDF, because it is from one of our clients.
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