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flutter / third_party / protobuf / bb38fc9c4d4220dbf02c2fbb19f66d34bf2d67f8
commitbb38fc9c4d4220dbf02c2fbb19f66d34bf2d67f8[log] [tgz]
authorProtobuf Team Bot <protobuf-github-bot@google.com>Fri Jun 10 14:32:58 2022 -0700
committerCopybara-Service <copybara-worker@google.com>Fri Jun 10 14:33:25 2022 -0700
treea67b2b03018df0352cf80d6fbb3c84e5f34b4e15
parent6e1aa9f136ad9749080b3a4765545bafd7243b0d [diff]
First implementation of protoc-gen-upbdev plugin

PiperOrigin-RevId: 454243195
10 files changed
tree: a67b2b03018df0352cf80d6fbb3c84e5f34b4e15
  1. .bazelci/
  2. .github/
  3. bazel/
  4. benchmarks/
  5. cmake/
  6. docs/
  7. python/
  8. third_party/
  9. upb/
  10. upbc/
  11. .bazelignore
  12. .bazelrc
  13. .clang-format
  14. .gitignore
  15. BUILD
  16. CONTRIBUTING.md
  17. DESIGN.md
  18. LICENSE
  19. README.md
  20. WORKSPACE
README.md

μpb: small, fast C protos

μpb (often written ‘upb’) is a small protobuf implementation written in C.

upb is the core runtime for protobuf languages extensions in Ruby, PHP, and (soon) Python.

While upb offers a C API, the C API & ABI are not stable. For this reason, upb is not generally offered as a C library for direct consumption, and there are no releases.

Features

upb has comparable speed to protobuf C++, but is an order of magnitude smaller in code size.

Like the main protobuf implementation in C++, it supports:

  • a generated API (in C)
  • reflection
  • binary & JSON wire formats
  • text format serialization
  • all standard features of protobufs (oneofs, maps, unknown fields, extensions, etc.)
  • full conformance with the protobuf conformance tests

upb also supports some features that C++ does not:

  • optional reflection: generated messages are agnostic to whether reflection will be linked in or not.
  • no global state: no pre-main registration or other global state.
  • fast reflection-based parsing: messages loaded at runtime parse just as fast as compiled-in messages.

However there are a few features it does not support:

  • text format parsing
  • deep descriptor verification: upb's descriptor validation is not as exhaustive as protoc.

Install

For Ruby, use RubyGems:

$ gem install google-protobuf

For PHP, use PECL:

$ sudo pecl install protobuf

Alternatively, you can build and install upb using vcpkg dependency manager:

git clone https://github.com/Microsoft/vcpkg.git
cd vcpkg
./bootstrap-vcpkg.sh
./vcpkg integrate install
./vcpkg install upb

The upb port in vcpkg is kept up to date by microsoft team members and community contributors.

If the version is out of date, please create an issue or pull request on the vcpkg repository.

Contributing

Please see CONTRIBUTING.md.