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flutter / third_party / protobuf / 173554146f4716febc4b33f3b42a2df4e54187f7
commit173554146f4716febc4b33f3b42a2df4e54187f7[log] [tgz]
authorJoshua Haberman <jhaberman@gmail.com>Wed Aug 11 14:10:28 2021 -0700
committerJoshua Haberman <jhaberman@gmail.com>Wed Aug 11 14:10:28 2021 -0700
tree1fc665207dff2dbcd2ad950bcc6c27f700f91850
parentc5d6ec737ee0e66178dfb334c3818bed861e3e55 [diff]
Updated some docs and removed/rearranged some obsolete stuff.
20 files changed
tree: 1fc665207dff2dbcd2ad950bcc6c27f700f91850
  1. .bazelci/
  2. .github/
  3. bazel/
  4. benchmarks/
  5. kokoro/
  6. tests/
  7. third_party/
  8. upb/
  9. upbc/
  10. .bazelrc
  11. .gitignore
  12. BUILD
  13. CONTRIBUTING.md
  14. LICENSE
  15. README.md
  16. 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, 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 some features it does not support:

  • proto2 extensions (coming soon!)
  • text format parsing
  • deep descriptor verification: upb's descriptor validation is not is exhaustive as protoc.

Install

For Ruby, use RubyGems:

$ gem install google-protobuf

For PHP, use PECL:

$ sudo pecl install protobuf

Contributing

Please see CONTRIBUTING.md.