BitmapFrame: System.IO.FileFormatException: 'Unexpected property type or value.'

• .NET Core Version: 6.0
• Windows version: Windows 10 21H2
• Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes

Problem description: When creating a BitmapFrame from a MemoryStream, it throws a FileFormatException, on specific images: BitmapFrame Frame = BitmapFrame.Create(stream, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);

Please note that when loading the same faulty image as a Resource and putting it into an Image in XAML, it does not has any issues.

Actual behavior: It gives the following exception:

System.IO.FileFormatException: 'Unexpected property type or value.'
COMException: The bitmap property type is unexpected. (0x88982F8E)

Expected behavior: I expect it not to throw an exception, and load correctly.

Minimal repro: Please see this sample app I created: https://github.com/ZetaKebab/BitmapFrameIssue The issue only happens with one of the two images (cover1.jpg is faulty, not cover2.jpg).

[miloush]

The image metadata is corrupted/invalid. It throws because you are requesting to load the metadata using BitmapCacheOption.OnLoad. Using the image as an resource does not use OnLoad and therefore does not try to touch the metadata.

My suspicion about the image having a thumbnail was correct. The thumbnail is compressed and therefore the metadata must contain the Compression EXIF tag. The specification defines the tag as of type SHORT. However, the file contains the tag as of type LONG.

The tag is at offset 158 in the file: 03 01 04 00 01 00 00 00 06, where

• 03 01 Tag 259 (Compression)
• 04 00 Type 4 (LONG)
• 01 Count
• 00 00 00 06 Value 6 indicating JPEG compressed thumbnail.

The exception message is actually accurate. As per the comment in the file, the image was created by gd-jpeg v1.0 (using IJG JPEG v62), which is where the fix needs to be done.

[singhashish-wpf]

@ZetaKebab Could you please share inputs on the above question?