how to check a field

[Ed Beroset <beroset () mindspring com>]

I am working on refining a dissector and need to make sure the tree I'm 
passed actually points to the field I intend.  This code may be called 
either before or after the packet is dissected.  To do this I'm using 
code like this:

if (PNODE_FINFO(tree)->hfinfo->id == hf_myproto_specialfield)
{  /* do stuff... */ }

I don't like to reach that deep into the hfinfo data structure, but it 
seems that the only alternative that would work would be to call 
proto_find_finfo(tree, hf_myproto_specialfield) but that's not really 
what I want and incurs a much larger runtime penalty than is really 
needed.  Is there a better way to do this?

Ed
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