Added a "subtree context" structure to asn1_ctx_t. This should allow other ASN.1 dissector global variables to be replaced when only used for transferring data between fields in a subtree.
svn path=/trunk/; revision=50208
with other dissectors using p1.content, such as p7.
Reset global content_type_id so this will be correct in more cases.
This is still not a good solution, because ContentType and Content are
generic objects which may occur individual in P7.
Indicate when to report invalid content-type.
svn path=/trunk/; revision=36025
Guy Harris