ProtoZero

ProtoZero is a zero-copy zero-malloc append-only protobuf library. It's designed to be fast and efficient at the cost of a reduced API surface for generated stubs. The main limitations consist of:

• Append-only interface: no readbacks are possible from the stubs.
• No runtime checks for duplicated or missing mandatory fields.
• Mandatory ordering when writing of nested messages: once a nested message is started it must be completed before adding any fields to its parent.

See also: Design doc.