"The archive entry was compressed using an unsupported compression method." Exception when loading certain PNGs in Azure Function App v4 and .NET6

[MattTravis]

Hi,
I have an Azure hosted Function App that uses ImageSharp to resize images sourced from a stream from Azure storage account blob store. This was working fine in .NET core 3.1 and Function App v3, but now we are trying to migrate to .NET6 and Function App v4 and I am seeing some issues when attempting to load certain PNGs in the Azure environment, but not when running locally from Visual Studio.
The exception message I get is "The archive entry was compressed using an unsupported compression method.".
Stack Trace:

[
            {
            "assembly": "System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
            "level": 0,
            "line": 0,
            "method": "System.IO.Compression.Inflater.Inflate"
            },
            {
            "assembly": "System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
            "level": 1,
            "line": 0,
            "method": "System.IO.Compression.Inflater.ReadInflateOutput"
            },
            {
            "assembly": "System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
            "level": 2,
            "line": 0,
            "method": "System.IO.Compression.Inflater.ReadOutput"
            },
            {
            "assembly": "System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
            "level": 3,
            "line": 0,
            "method": "System.IO.Compression.Inflater.InflateVerified"
            },
            {
            "assembly": "System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
            "level": 4,
            "line": 0,
            "method": "System.IO.Compression.DeflateStream.ReadCore"
            },
            {
            "assembly": "System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
            "level": 5,
            "line": 0,
            "method": "System.IO.Compression.DeflateStream.Read"
            },
            {
            "assembly": "SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
            "level": 6,
            "line": 0,
            "method": "SixLabors.ImageSharp.Formats.Png.PngDecoderCore.DecodePixelData"
            },
            {
            "assembly": "SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
            "level": 7,
            "line": 0,
            "method": "SixLabors.ImageSharp.Formats.Png.PngDecoderCore.Decode"
            },
            {
            "assembly": "SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
            "level": 8,
            "line": 0,
            "method": "SixLabors.ImageSharp.Formats.Png.PngDecoder.Decode"
            },
            {
            "assembly": "SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
            "level": 9,
            "line": 0,
            "method": "SixLabors.ImageSharp.Image.Decode"
            },
            {
            "assembly": "SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
            "level": 10,
            "line": 0,
            "method": "SixLabors.ImageSharp.Image+<>c__DisplayClass54_01.<Load>b__0"
            },
            {
            "assembly": "SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
            "level": 11,
            "line": 0,
            "method": "SixLabors.ImageSharp.Image.WithSeekableStream"
            },
            {
            "assembly": "SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
            "level": 12,
            "line": 0,
            "method": "SixLabors.ImageSharp.Image.Load"
            }
        ]

We experienced this issue using ImageSharp 1.0.2. Upgrading to 2.1.3 results in the same behavior.
It seems to be able to process other image formats just fine, and it is only certain PNGs that seem to fail.
How can I use ImageSharp to resize these PNGs successfully in a .NET6 and Function App v4 environment?

[JimBobSquarePants]

So the images work outside of the Azure function? If so then the issue is not with the library.

There were issues with the deflatestream due to a breaking change in .NET 6 but that was fixed with #1707 Your stack trace only shows the old v1 ImageSharp version.

[MattTravis]

Thanks for the reply. I figured as much, but thought I might raise it here in case there was a known issue. Do you need to see a stack trace from the newer library version?

[MattTravis]

System.IO.InvalidDataException:
   at System.IO.Compression.Inflater.Inflate (System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at System.IO.Compression.Inflater.ReadInflateOutput (System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at System.IO.Compression.Inflater.ReadOutput (System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at System.IO.Compression.Inflater.InflateVerified (System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at System.IO.Compression.DeflateStream.ReadCore (System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at System.IO.Compression.DeflateStream.Read (System.IO.Compression, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at SixLabors.ImageSharp.Formats.Png.PngDecoderCore.DecodePixelData (SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)
   at SixLabors.ImageSharp.Formats.Png.PngDecoderCore.Decode (SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)
   at SixLabors.ImageSharp.Formats.Png.PngDecoder.Decode (SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)
   at SixLabors.ImageSharp.Image.Decode (SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)
   at SixLabors.ImageSharp.Image+<>c__DisplayClass54_0`1.<Load>b__0 (SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)
   at SixLabors.ImageSharp.Image.WithSeekableStream (SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)
   at SixLabors.ImageSharp.Image.Load (SixLabors.ImageSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)

So this stack trace was from earlier today, and it still shows the v1 ImageSharp version :/ I am certain my nuget package is version 2.1.3 though...

[JimBobSquarePants]

Looks like the updated version wasn’t deployed properly then. Once you do that everything should work.