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Redesign ASN.1 encoder engine, removing field_info
Replace the "field" half of the ASN.1 encoder machinery with several new struct atype_info types (offset, counted, and int_immediate) and a new counted_type machinery used exclusively for object/integer pairs. This change eliminates the two-way entanglement between atypes and fields, and makes the encoder more independent of RFC 4120 ASN.1 conventions. Defining sequences with the preprocessor macros is now slightly more cumbersome; we need to define a type for each field and then string them together with an array of struct atype_info *. But it's not so bad, and hopefully we can auto-generate some of this soon. *_optional functions now return a bitmask of sequence field offsets not present in the C type. This will need some more attention before we add decoding support to the engine, since it means sequence fields no longer know whether they are optional or not. git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@25657 dc483132-0cff-0310-8789-dd5450dbe970
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