[OpenJDK 2D-Dev] [15] RFR JDK-6532025: GIF reader throws misleading exception with truncated images

[Jayathirth D v]

Hello All,

Please review the following fix for JDK 15:

Bug : https://bugs.openjdk.java.net/browse/JDK-6532025 <https://bugs.openjdk.java.net/browse/JDK-6532025>
Webrev : http://cr.openjdk.java.net/~jdv/6532025/webrev.00/ <http://cr.openjdk.java.net/~jdv/6532025/webrev.00/> 

Root cause : When we have truncated GIF images, stream.read() returns -1 but GIFImageReader doesn’t handle such conditions properly and continues to read input stream data.
Solution : Handle cases where we reach EOF and throw appropriate exception.

Thanks,
Jay
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