Comment #1 on issue 588 by Petteri.Aimonen: Add delta mechanism to the
encoding
http://code.google.com/p/protobuf/issues/detail?id=588
You can implement this yourself in your application:
1) In the .proto, declare all fields as optional.
2) On the encoder side, reset the message after every encoding. Then it
will only contain those optional fields that you have set after the
previous message.
3) On the decoder side, instead of ParseFromString(), use
MergeFromString(). This way the decoder will update those fields that are
in the message, while rest of them will retain their old value.
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