Protocol Buffers - Google's data interchange format (grpc依赖) https://developers.google.com/protocol-buffers/
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Protobuf Team Bot 7ccd5dcfc5 Internal change 1 month ago
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base Use `default_compatible_with` instead of specifying `compatible_with` on every target. 3 months ago
bazel Migrated upb to use Copybara-standard stripping. 3 months ago
cmake Auto-generate files after cl/692315472 1 month ago
conformance Add JSON parse conformance tests for non-numeric string in numeric fields. 1 month ago
hash Migrated upb to use Copybara-standard stripping. 3 months ago
io Fix minor typos (#17682) 3 months ago
json Automated Code Change 1 month ago
lex Migrated upb to use Copybara-standard stripping. 3 months ago
mem Internal change 1 month ago
message Port FindUnknown to noncontiguous API 1 month ago
mini_descriptor Use `default_compatible_with` instead of specifying `compatible_with` on every target. 3 months ago
mini_table Use `default_compatible_with` instead of specifying `compatible_with` on every target. 3 months ago
port Use portable posix sigsetjmp to avoid saving signals on linux, in addition to apple platforms. 1 month ago
reflection Updated upb bootstrap files for the latest changes to descriptor.proto. 1 month ago
test Automated Code Change 1 month ago
text upb_DebugString typo fix 1 month ago
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wire Fix minor typos (#17682) 3 months ago
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README.md Fixed broken link in upb README.md (#16717) 7 months ago
generated_code_support.h upb: tighten up and lock down upb/wire/ 12 months ago

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 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

For Python, use PyPI:

$ sudo pip 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.