Gif to png conversion

[appPrgmr]

Hi,

I am developing a network application that will convert gif files to png
on the fly using ImageMagick C APIs

Can anybody share any experience related to following

(i) Any potential thread -safety issues i should be aware of
( I assume it is thread safe)

(ii) issues in case i recieve corrupt /invalid gif files
any related potential security issue

(iii) example code - The code example i have seen writes to disk - I assume its possible
to do the conversion in memory as well

(iv) any optimizations for improving perofrmance

(v) any popular product examples using ImegMAgick in above way

Thanks in advance.