Vadim Zeitlin c2e5749443 Fix crash when reading truncated GIF image ...

Add a unit test case checking that we don't crash any longer and still
read the image meta data correctly, even if not the image itself.

Also add another check for EOF and possibly invalid "bits" value in
another place where we were not checking for it when reading from the
stream.

Closes #23409.

Co-authored-by: PB <PBfordev@gmail.com>

2023-07-02 18:06:03 +01:00

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