Unable to create a Document in Linux

[Dav-Sc]

MuPDF.NET Version: 3.2.8
Development Platform: Windows 11
Target Distribution: Docker Dotnet (mcr.microsoft.com/dotnet/aspnet:8.0)

When I dockerize the code, and try to create a document

var doc = new Document();

I get: MuPDF.NET.Document..ctor(String fileName, Byte[] stream, String fileType, Rect rect, Single width, Single height, Int32 fontSize)
at DocumentTabletEmailService.PDFUtilities.AllowModifyDocument(Byte[] pdfBytes)

I originally had it reading a file it still wouldn't work

[Dav-Sc]

I also tried Downgrading to 3.2.0 for the first linux support offered but some issue persists.

[Dav-Sc]

My whole function is

public static byte[] AllowModifyDocument(byte[] pdfBytes)
    {
        
        string tempInputPath = Path.GetTempFileName();
        string tempOutputPath = Path.ChangeExtension(Path.GetTempFileName(), ".pdf");

        File.WriteAllBytes(tempInputPath, pdfBytes);

        var inputDoc = new Document(tempInputPath);
        
        var outputDoc = new Document(tempOutputPath, inputDoc.Convert2Pdf());
        outputDoc.Save(tempOutputPath);

        byte[] pdfbytes = File.ReadAllBytes(tempOutputPath);

        outputDoc.Close();
        inputDoc.Close();
        File.Delete(tempInputPath);
        File.Delete(tempOutputPath);

        return pdfbytes;
    }

[Dav-Sc]

Stack trace:

at mupdf.mupdfPINVOKE.SWIGExceptionHelper.SWIGRegisterExceptionCallbacks_mupdf(ExceptionDelegate applicationDelegate, ExceptionDelegate arithmeticDelegate, ExceptionDelegate divideByZeroDelegate, ExceptionDelegate indexOutOfRangeDelegate, ExceptionDelegate invalidCastDelegate, ExceptionDelegate invalidOperationDelegate, ExceptionDelegate ioDelegate, ExceptionDelegate nullReferenceDelegate, ExceptionDelegate outOfMemoryDelegate, ExceptionDelegate overflowDelegate, ExceptionDelegate systemExceptionDelegate)
2025-06-24T17:05:42.199319011Z at mupdf.mupdfPINVOKE.SWIGExceptionHelper..cctor()
2025-06-24T17:05:42.199325604Z --- End of inner exception stack trace ---
2025-06-24T17:05:42.199331707Z at mupdf.mupdfPINVOKE.SWIGExceptionHelper..ctor()
2025-06-24T17:05:42.199338179Z at mupdf.mupdfPINVOKE..cctor()
2025-06-24T17:05:42.199344422Z --- End of inner exception stack trace ---
2025-06-24T17:05:42.199350842Z at mupdf.mupdfPINVOKE.new_FzColorspace__SWIG_5(Int32 jarg1)
2025-06-24T17:05:42.199357500Z at mupdf.FzColorspace..ctor(Fixed fixed_)
2025-06-24T17:05:42.199364272Z at MuPDF.NET.ColorSpace..ctor(Int32 type)
2025-06-24T17:05:42.199371284Z at MuPDF.NET.Utils..cctor()
2025-06-24T17:05:42.199377568Z --- End of inner exception stack trace ---
2025-06-24T17:05:42.199384005Z at MuPDF.NET.Utils.InitApp()
2025-06-24T17:05:42.199390665Z at MuPDF.NET.Document..cctor()
2025-06-24T17:05:42.199397132Z --- End of inner exception stack trace ---
2025-06-24T17:05:42.199404483Z at MuPDF.NET.Document..ctor(String fileName, Byte[] stream, String fileType, Rect rect, Single width, Single height, Int32 fontSize)

[Dav-Sc]

if I add
RUN apt-get update && apt-get install -y mupdf mupdf-tools
to my Dockerfile I get:

System.TypeInitializationException: The type initializer for 'MuPDF.NET.Document' threw an exception.
2025-06-24T17:10:26.763866166Z ---> System.TypeInitializationException: The type initializer for 'MuPDF.NET.Utils' threw an exception.
2025-06-24T17:10:26.763872369Z ---> System.TypeInitializationException: The type initializer for 'mupdf.mupdfPINVOKE' threw an exception.
2025-06-24T17:10:26.763876147Z ---> System.TypeInitializationException: The type initializer for 'SWIGExceptionHelper' threw an exception.
2025-06-24T17:10:26.763883428Z ---> System.DllNotFoundException: Unable to load shared library 'mupdfcsharp.dll' or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace. If you're using glibc, consider setting the LD_DEBUG environment variable:
2025-06-24T17:10:26.763887219Z /app/bin/Debug/net8.0/runtimes/linux-x64/native/mupdfcsharp.dll.so: cannot open shared object file: No such file or directory
2025-06-24T17:10:26.763889820Z /usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.14/mupdfcsharp.dll.so: cannot open shared object file: No such file or directory
2025-06-24T17:10:26.763892172Z /app/bin/Debug/net8.0/mupdfcsharp.dll.so: cannot open shared object file: No such file or directory
2025-06-24T17:10:26.763895060Z /app/bin/Debug/net8.0/runtimes/linux-x64/native/libmupdfcsharp.dll.so: cannot open shared object file: No such file or directory
2025-06-24T17:10:26.763917207Z /usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.14/libmupdfcsharp.dll.so: cannot open shared object file: No such file or directory
2025-06-24T17:10:26.763920392Z /app/bin/Debug/net8.0/libmupdfcsharp.dll.so: cannot open shared object file: No such file or directory
2025-06-24T17:10:26.763922915Z /app/bin/Debug/net8.0/runtimes/linux-x64/native/mupdfcsharp.dll: cannot open shared object file: No such file or directory
2025-06-24T17:10:26.763927084Z /usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.14/mupdfcsharp.dll: cannot open shared object file: No such file or directory
2025-06-24T17:10:26.763930047Z /app/bin/Debug/net8.0/mupdfcsharp.dll: invalid ELF header
2025-06-24T17:10:26.763932545Z /app/bin/Debug/net8.0/runtimes/linux-x64/native/libmupdfcsharp.dll: cannot open shared object file: No such file or directory
2025-06-24T17:10:26.763935254Z /usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.14/libmupdfcsharp.dll: cannot open shared object file: No such file or directory
2025-06-24T17:10:26.763940657Z /app/bin/Debug/net8.0/libmupdfcsharp.dll: cannot open shared object file: No such file or directory
2025-06-24T17:10:26.763943279Z
2025-06-24T17:10:26.763946411Z at mupdf.mupdfPINVOKE.SWIGExceptionHelper.SWIGRegisterExceptionCallbacks_mupdf(ExceptionDelegate applicationDelegate, ExceptionDelegate arithmeticDelegate, ExceptionDelegate divideByZeroDelegate, ExceptionDelegate indexOutOfRangeDelegate, ExceptionDelegate invalidCastDelegate, ExceptionDelegate invalidOperationDelegate, ExceptionDelegate ioDelegate, ExceptionDelegate nullReferenceDelegate, ExceptionDelegate outOfMemoryDelegate, ExceptionDelegate overflowDelegate, ExceptionDelegate systemExceptionDelegate)
2025-06-24T17:10:26.763950186Z at mupdf.mupdfPINVOKE.SWIGExceptionHelper..cctor()
2025-06-24T17:10:26.763952481Z --- End of inner exception stack trace ---
2025-06-24T17:10:26.763954653Z at mupdf.mupdfPINVOKE.SWIGExceptionHelper..ctor()
2025-06-24T17:10:26.763957247Z at mupdf.mupdfPINVOKE..cctor()
2025-06-24T17:10:26.763959448Z --- End of inner exception stack trace ---
2025-06-24T17:10:26.763961819Z at mupdf.mupdfPINVOKE.new_FzColorspace__SWIG_5(Int32 jarg1)
2025-06-24T17:10:26.763964102Z at mupdf.FzColorspace..ctor(Fixed fixed_)
2025-06-24T17:10:26.763966351Z at MuPDF.NET.ColorSpace..ctor(Int32 type)
2025-06-24T17:10:26.763968785Z at MuPDF.NET.Utils..cctor()
2025-06-24T17:10:26.763970821Z --- End of inner exception stack trace ---
2025-06-24T17:10:26.763973110Z at MuPDF.NET.Utils.InitApp()
2025-06-24T17:10:26.763975201Z at MuPDF.NET.Document..cctor()
2025-06-24T17:10:26.763977498Z --- End of inner exception stack trace ---
2025-06-24T17:10:26.763979979Z at MuPDF.NET.Document..ctor(String fileName, Byte[] stream, String fileType, Rect rect, Single width, Single height, Int32 fontSize)

[Dav-Sc]

When building for linux it does NOT generate any .so files

[MaksymTkachuk]

@Dav-Sc
I will check this issue and contact you asap.
Thanks.

[MaksymTkachuk]

@Dav-Sc
I tried to reproduce this issue at my Ubuntu, but could not see any problem.
I tested with MuPDF.NET 3.2.8.
Could you show me the function that are calling AllowModifyDocument()?
And how did you make the byte[] array for input parameter (byte[] pdfBytes) ?
If you get it from any pdf document, please send it to me.
Thanks.

[antoniobuyukluev]

@MaksymTkachuk i have similar issue. On local all works good but when i make a docker image and run it in the azure as Container web app i get this. The container app is on linux

System.TypeInitializationException:    at mupdf.mupdfPINVOKE.new_FzRect__SWIG_6 (MuPDF.NET, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)    at mupdf.FzRect..ctor (MuPDF.NET, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)    at MuPDF.NET.Document..ctor (MuPDF.NET, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)    at ONIT.Application.US.Features.PowerAutomateFlow.BrokerConfirmation.ProcessDataCommandHandler+d__7.MoveNext (ONIT.Application.US, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null: /src/src/ONIT.Application.US/Features/PowerAutomateFlow/BrokerConfirmation/ProcessDataCommandHandler.cs:50) Inner exception System.TypeInitializationException handled at mupdf.mupdfPINVOKE.new_FzRect__SWIG_6:    at mupdf.mupdfPINVOKE+SWIGExceptionHelper..ctor (MuPDF.NET, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)    at mupdf.mupdfPINVOKE..cctor (MuPDF.NET, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null) Inner exception System.DllNotFoundException handled at mupdf.mupdfPINVOKE+SWIGExceptionHelper..ctor:    at mupdf.mupdfPINVOKE+SWIGExceptionHelper.SWIGRegisterExceptionCallbacks_mupdf (MuPDF.NET, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)    at mupdf.mupdfPINVOKE+SWIGExceptionHelper..cctor (MuPDF.NET, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)

[MaksymTkachuk]

@antoniobuyukluev
What version of nuget release are you testing with?
The latest version is 3.2.12-rc.12.
If you are testing with that, please let me know the details of your docker.
Thanks.

[JTrotta]

Got the same problem on Linux. Version PDF4LLM 1.27.2.9 MuPDF.NET 3.2.16 :
System.TypeInitializationException: The type initializer for 'mupdf.mupdfPINVOKE' threw an exception.
May 08 13:12:27 web04 worker[3616378]: ---> System.TypeInitializationException: The type initializer for 'SWIGExceptionHelper' threw an exception.
May 08 13:12:27 web04 worker[3616378]: ---> System.DllNotFoundException: Unable to load shared library 'mupdfcsharp.dll' or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace. If you're using glibc, consider setting the LD_DEBUG environment variable:
May 08 13:12:27 web04 worker[3616378]: /opt/enigma/worker/runtimes/linux-x64/native/mupdfcsharp.dll.so: cannot open shared object file: No such file or directory
May 08 13:12:27 web04 worker[3616378]: /usr/share/dotnet/shared/Microsoft.NETCore.App/10.0.5/mupdfcsharp.dll.so: cannot open shared object file: No such file or directory
May 08 13:12:27 web04 worker[3616378]: /opt/eng/worker/mupdfcsharp.dll.so: cannot open shared object file: No such file or directory
May 08 13:12:27 web04 worker[3616378]: /opt/eng/worker/runtimes/linux-x64/native/libmupdfcsharp.dll.so: cannot open shared object file: No such file or directory
May 08 13:12:27 web04 worker[3616378]: /usr/share/dotnet/shared/Microsoft.NETCore.App/10.0.5/libmupdfcsharp.dll.so: cannot open shared object file: No such file or directory
May 08 13:12:27 web04 worker[3616378]: /opt/eng/worker/libmupdfcsharp.dll.so: cannot open shared object file: No such file or directory
May 08 13:12:27 web04 worker[3616378]: /opt/eng/worker/runtimes/linux-x64/native/mupdfcsharp.dll: cannot open shared object file: No such file or directory
May 08 13:12:27 web04 worker[3616378]: /usr/share/dotnet/shared/Microsoft.NETCore.App/10.0.5/mupdfcsharp.dll: cannot open shared object file: No such file or directory
May 08 13:12:27 web04 worker[3616378]: /opt/eng/worker/mupdfcsharp.dll: invalid ELF header
May 08 13:12:27 web04 worker[3616378]: /opt/eng/worker/runtimes/linux-x64/native/libmupdfcsharp.dll: cannot open shared object file: No such file or directory
May 08 13:12:27 web04 worker[3616378]: /usr/share/dotnet/shared/Microsoft.NETCore.App/10.0.5/libmupdfcsharp.dll: cannot open shared object file: No such file or directory
May 08 13:12:27 web04 worker[3616378]: /opt/eng/worker/libmupdfcsharp.dll: cannot open shared object file: No such file or directory
May 08 13:12:27 web04 worker[3616378]: at mupdf.mupdfPINVOKE.SWIGExceptionHelper.SWIGRegisterExceptionCallbacks_mupdf(ExceptionDelegate applicationDelegate, ExceptionDelegate arithmeticDelegate, ExceptionDelegate divideByZeroDelegate, ExceptionDelegate indexOutOfRangeDelegate, ExceptionDelegate invalidCastDelegate, ExceptionDelegate invalidOperationDelegate,>
May 08 13:12:27 web04 worker[3616378]: at mupdf.mupdfPINVOKE.SWIGExceptionHelper..cctor()
May 08 13:12:27 web04 worker[3616378]: --- End of inner exception stack trace ---
May 08 13:12:27 web04 worker[3616378]: at mupdf.mupdfPINVOKE.SWIGExceptionHelper..ctor()
May 08 13:12:27 web04 worker[3616378]: at mupdf.mupdfPINVOKE..cctor()
May 08 13:12:27 web04 worker[3616378]: --- End of inner exception stack trace ---
May 08 13:12:27 web04 worker[3616378]: at mupdf.mupdfPINVOKE.new_FzRect__SWIG_6(Int32 jarg1)
May 08 13:12:27 web04 worker[3616378]: at mupdf.mupdfPINVOKE.new_FzRect__SWIG_6(Int32 jarg1)
May 08 13:12:27 web04 worker[3616378]: at mupdf.FzRect..ctor(Fixed fixed_)
May 08 13:12:27 web04 worker[3616378]: at MuPDF.NET.Document..ctor(String fileName, Byte[] stream, String fileType, Rect rect, Single width, Single height, Int32 fontSize)
May 08 13:12:27 web04 worker[3616378]: at Worker.ChatService.Services.MuPdfTextExtractor.ExtractMarkdown(String path, Boolean useOcr, Boolean forceOcr)
May 08 13:12:27 web04 worker[3616378]: at Worker.ChatService.Services.MuPdfTextExtractor.ExtractAsync(Byte[] content, CancellationToken ct)
May 08 13:12:27 web04 worker[3616378]: at Worker.ChatService.Services.PdfOcrProcessor.ExtractTextAsync(Byte[] pdfBytes, CancellationToken ct)
May 08 13:12:27 web04 worker[3616378]: at Worker.ChatService.Services.DocumentParser.ParseAsync(String fileName, String contentType, Byte[] content, CancellationToken ct)
May 08 13:12:27 web04 worker[3616378]: at Worker.ChatService.Services.FileIngestionService.HandleIngestFileAsync(FileUploadMessage cmd)

[JTrotta]

Found the error! File MuPDF.NativeAssets.targets is platform dependend NOT target dependend

<ItemGroup Condition="'$(OS)' != 'Windows_NT'">
  <Content Include="$(MSBuildThisFileDirectory)../native/linux-x64/*.*">
    <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
  </Content>
</ItemGroup>

So even if I publish from Windows to linux-64 target it always compile for windows. It should be changed to target PlatformTarget

[MaksymTkachuk]

@JTrotta
I will address this issue in the next version of the MuPDF.NativeAssets NuGet package.
Thank you for your assistance and interest.

[JTrotta]

If it can help, this is correct:

<ItemGroup Condition="'$(IsWinX64)' == 'true'">
  <Content Include="$(MSBuildThisFileDirectory)../native/win-x64/*.*"
           CopyToOutputDirectory="PreserveNewest"
           CopyToPublishDirectory="PreserveNewest" />
</ItemGroup>

<ItemGroup Condition="'$(IsWinX86)' == 'true'">
  <Content Include="$(MSBuildThisFileDirectory)../native/win-x86/*.*"
           CopyToOutputDirectory="PreserveNewest"
           CopyToPublishDirectory="PreserveNewest" />
</ItemGroup>

<ItemGroup Condition="'$(IsLinuxX64)' == 'true'">
  <Content Include="$(MSBuildThisFileDirectory)../native/linux-x64/*.*"
           CopyToOutputDirectory="PreserveNewest"
           CopyToPublishDirectory="PreserveNewest" />
</ItemGroup>