Imagesharp: PNG from web url fails to load or identify.

[EelhandsMcCoy]

Prerequisites

• [X] I have written a descriptive issue title
• [X] I have verified that I am running the latest version of ImageSharp
• [X] I have verified if the problem exist in both DEBUG and RELEASE mode
• [X] I have searched open and closed issues to ensure it has not already been reported

Description

Downloading certain png as a byte array or a stream results in errors. Either "stream is invalid" or "png contains no data chunk" etc.

Steps to Reproduce

                var client = _httpClientFactory.CreateClient();
                var bytes = await client.GetStreamAsync(p.ImageUrl);
                var image = SixLabors.ImageSharp.Image.Load(bytes, new PngDecoder());

System Configuration

• ImageSharp version: 1.0.0 beta 7.
• Other ImageSharp packages and versions:
• Environment (Operating system, version and so on): Windows 10 x64.
• .NET Framework version: .Net Core 3.
• Additional information:

Here are the images:

[JimBobSquarePants]

Try the following:

c# var client = _httpClientFactory.CreateClient(); using(var bytes = await client.GetStreamAsync(p.ImageUrl)) { // Remember to dispose of this image once you are finished. var image = SixLabors.ImageSharp.Image.Load(bytes, new PngDecoder()); }

It looks to me like you're having the same issue as https://github.com/SixLabors/ImageSharp/issues/1029#issuecomment-544061230

[EelhandsMcCoy]

Switched to the suggested code, same issue. ImageFormatException: Image stream is not valid.

Edit: I did see similar issues, but I thought there might be something distinctly wrong with the png files in question. Maybe the metadata is off somehow, or something nonstandard is going on.

Edit#2: I ran both files through pngcheck, and it reports "EOF while reading CRC value."

[JimBobSquarePants]

What happens when you copy your input stream to a MemoryStream and load via that? Something is causing your stream not to flush.

I'm assuming of course, that the requests are successful.

[EelhandsMcCoy]

Same thing happens.

[JimBobSquarePants]

Thanks for the extra info, I appreciate it.

I ran both files through pngcheck, and it reports "EOF while reading CRC value.
I have done some investigation and confirmed your findings. However we are attempting to read the crc data from those images and throwing an error whether they are critical or not. I will work on a fix asap.