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Albrecht Schlosser cc82b742be Improve GIF error handling, terminate on some errors
There's not much we can do if we find unknown data in the main
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If we find a GIF trailer (0x3b) this means logical end of file.
If we get there in the main loop the GIF file is empty (no image).

This behavior is consistent with many other image viewers including
browsers (Firefox and Chrome).
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README - Fast Light Tool Kit (FLTK) Version 1.4.0

WHAT IS FLTK?

The Fast Light Tool Kit ("FLTK", pronounced "fulltick") is a
a cross-platform C++ GUI toolkit for UNIX(r)/Linux(r) (X11),
Microsoft(r) Windows(r), and MacOS(r) X. FLTK provides
modern GUI functionality without the bloat and supports 3D
graphics via OpenGL(r) and its built-in GLUT emulation. It
was originally developed by Mr. Bill Spitzak and is
currently maintained by a small group of developers across
the world with a central repository in the US.

For more information see README.txt:
https://github.com/fltk/fltk/blob/master/README.txt

Build