gif: refactor the detection of a gif file

Generally, we should not throw an exception before we know that this is
our file/packet. Use tvb_strneql() to get the version string. This
function does not throw an exception if there are fewer bytes left than
we requested.

(I know that we check for reported len < 20. However, for captured
length > 6 and reported length < 20, the current code does not work.)

Change-Id: I5214c5c9dc9da616a94ae96269ec1c9e6f412e8e
Reviewed-on: https://code.wireshark.org/review/21544
Petri-Dish: Martin Kaiser <wireshark@kaiser.cx>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Martin Kaiser <wireshark@kaiser.cx>

0 files changed, 0 insertions, 0 deletions