tree 15e36fe88adff04ccc410d7496ec828600547c91
parent 62e782f47e4c57935994133e44f1716d281504e4
author bcmills <bcmills@google.com> 1479324471 +0000
committer Bryan C. Mills <bcmills@google.com> 1479352021 -0500

proto: Add a descriptor subpackage.

This provides a more reasonable API for obtaining a FileDescriptorProto and
DescriptorProto for a given proto.Message — a process that is currently possible
(but undocumented) using the public proto API.

The major use case for obtaining a DescriptorProto is to decode custom message
options, which are encoded as extensions on the MessageOptions submessage.
(See https://developers.google.com/protocol-buffers/docs/proto#customoptions.)

Fixes https://github.com/golang/protobuf/issues/179.
PiperOrigin-RevId: 139356528