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session-ios/SignalServiceKit/protobuf/README.md

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# SignalServiceKit Protobufs
These protobuf definitions are copied from Signal-Android, but modified
to include a conventional ObjC classnames.
e.g.
import "objectivec-descriptor.proto";
option (google.protobuf.objectivec_file_options).class_prefix = "OWSFingerprintProtos";
## Prequisites
Install protobuf 2.6, the objc plugin doesn't currently work with
protobuf 3.0
brew install protobuf@2.6
# Beware if you are depending on protobuf 3.0 elsewhere
brew link --force protobuf@2.6
Install the objc plugin to $SignalServiceKitRoot/..
e.g. I have SignalServiceKit installed to ~/src/WhisperSystems/SignalServiceKit
So I run
cd ~/src/WhisperSystems
git clone https://github.com/alexeyxo/protobuf-objc
Follow the install instructions at https://github.com/alexeyxo/protobuf-objc
## Building Protobuf
After changes are made to any proto, generate the ObjC classes by
running:
cd ~/src/WhisperSystems/SignalServiceKit/protobuf
make