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[16:48:40] <psha> mhaberler: capnp was really woth reading
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[16:48:58] <mhaberler> great - is it useful yet?
[16:49:00] <psha> at least it proves me that offset pointer may be implemented
[16:49:16] <mhaberler> offset pointer… who is that
[16:49:25] <mhaberler> used in his encoding?
[16:49:30] <psha> i have not yet decided if i have to use it's format as-is or just adopt some smart ideas
[16:49:40] <psha> offset pointer...
[16:49:50] <psha> assume you have message int, string, int
[16:49:50] <mhaberler> job security :-?
[16:49:54] <mhaberler> ok
[16:50:07] <psha> how do you encode it?
[16:50:13] <mhaberler> vtable
[16:50:28] <psha> if you encode as 4-bytes int, 2-byte string len, N bytes string, 4-bytes int
[16:50:29] <mhaberler> does he have a tagger pointer map or what
[16:50:34] <mhaberler> tagged
[16:50:42] <psha> it's impossible to know where exactly third field live
[16:51:06] <psha> but if you encode just like struct n { int f0; const char * str; int f1; }
[16:51:21] <psha> then you'll get 4-byte int, offset pointer, 4-byte int, string data
[16:51:31] <psha> and you cat access any fixed field with just offset
[16:51:35] <mhaberler> basically a TLV format
[16:51:42] <psha> and variable fields (string, list) with offset pointer
[16:52:22] <mhaberler> are these structs all at the beginning or interleaved with data?
[16:53:06] <psha> as i understand simple structures with scalar only fields (int, double, bool) are offset only
[16:53:09] <psha> just like plain C struct
[16:53:27] <psha> everything else - list, string, sub-structs are implemented with offset pointers
[16:53:56] <psha> again - just like in C - struct s { int i; int *int_list; struct sub * sub_field; ... }
[16:54:30] <psha> i've used such approach for presense maps on complex structures and now i see that it's possible to use for data too
[16:55:17] <psha> heh, on friedday i had discussion with my collegue about offset packed strings :]
[16:55:31] <psha> so thanks a lot for that link :)
[16:55:42] <mhaberler> the capnp infrastructure isnt there, but the protobuf is - why dont you use the capnp de/serializers with protobuf like transenc does?
[16:57:14] <psha> capnp has complex algorithm of offset calculation
[16:57:29] <mhaberler> ah, not a drop in
[16:57:33] <psha> so it's not possible to just 'encode this field, encode that fields'
[16:57:43] <psha> for pb it's ok to just append several fields one by one
[16:57:52] <psha> they are tagged and order is not imporant
[16:58:15] <psha> *) important for performance - deserialization works better when fields are encoded in order of their ID's
[16:58:53] <psha> with capnp you can not just encode them one by one - fields may be placed in padding space of earlier ones
[16:58:56] <mhaberler> does that really count, I mean a few hundred nsec up or down
[16:59:02] <psha> however - not impossible
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