Messagepack February 13, 2018 | Quick Intro

MessagePack February 13, 2018 | Quick Intro

Giovanni Vergine

This work is licensed under a Creative Commons Attribution-Share Alike 4.0 (CC BY-SA 4.0) GENIVI is a registered trademark of the GENIVI Alliance in the USA and other countries. Copyright © GENIVI Alliance 2018. MessagePack

• binary serialization format • supported by over 50 programming languages and environments • No schema/generators • https://msgpack.org/ Json/MsgPack comparison

“It's like JSON. but fast and small.” MsgPack JSON -- https://msgpack.org/ Integer Number Nil null Boolean true/false Float Number Array Array Map (any key) Object (str key) String String Byte Array Base64 String

https://github.com/msgpack/msgpack-c/wiki/v2_0_cpp_object

• An extension is 1 Integer + 1 Byte Array • The Integer represent the kind of types [0-127] • This is for custom types/format • [-128,-1] is reserved for predefined types. • The only one for now is “Timestamp” (-1) Ex. Timestamp:

0xd7 -1 0x00 0x00 0xc6 …

fixext-8

Ex. 4-bytes bytearray of custom type 42 with max size 2^16-1

0xc8 0x00 0x04 42 0x01 0x02 0x03 0x04

ext-16

5 | February 13, 2018 | Copyright © GENIVI Alliance 2018 MsgPack • Widely supported by community • C/C++ versions supported by the author himself • Not “really” famous • Easier to use when you have your IDL (e.g. Franca) instead of intermediate step (e.g. generate .proto from .fidl and then call protoc)

Spec: https://github.com/msgpack/msgpack/blob/master/spec.md

Wiki: https://github.com/msgpack/msgpack-c/wiki

Visit GENIVI at http://www.genivi.org or http://projects.genivi.org Contact us: [email protected] This work is licensed under a Creative Commons Attribution-Share Alike 4.0 (CC BY-SA 4.0) GENIVI is a registered trademark of the GENIVI Alliance in the USA and other countries. Copyright © GENIVI Alliance 2017.