1 files changed, 62 insertions, 0 deletions
diff --git a/upb/google/proto2.h b/upb/google/proto2.h
new file mode 100644
index 0000000..f2662ea
--- /dev/null
+++ b/upb/google/proto2.h
@@ -0,0 +1,62 @@
+//
+// upb - a minimalist implementation of protocol buffers.
+//
+// Copyright (c) 2011-2012 Google Inc.  See LICENSE for details.
+// Author: Josh Haberman <jhaberman@gmail.com>
+//
+// Support for registering field handlers that can write into a proto2
+// message that uses GeneratedMessageReflection (which includes all messages
+// generated by the proto2 compiler as well as DynamicMessage).
+//
+// This is a low-level interface; the high-level interface in google.h is
+// more user-friendly.
+
+#ifndef UPB_GOOGLE_PROTO2_H_
+#define UPB_GOOGLE_PROTO2_H_
+
+namespace proto2 {
+class FieldDescriptor;
+class Message;
+}
+
+namespace google {
+namespace protobuf {
+class FieldDescriptor;
+class Message;
+}
+}
+
+namespace upb {
+class FieldDef;
+class Handlers;
+}
+
+namespace upb {
+namespace google {
+
+// Sets field handlers in the given Handlers object for writing to a single
+// field (as described by "proto2_f" and "upb_f") into a message constructed
+// by the same factory as "prototype."  Returns true if this was successful
+// (this will fail if "prototype" is not a proto1 message, or if we can't
+// handle it for some reason).
+bool TrySetWriteHandlers(const proto2::FieldDescriptor* proto2_f,
+                         const proto2::Message& prototype,
+                         const upb::FieldDef* upb_f, upb::Handlers* h);
+bool TrySetWriteHandlers(const ::google::protobuf::FieldDescriptor* proto2_f,
+                         const ::google::protobuf::Message& prototype,
+                         const upb::FieldDef* upb_f, upb::Handlers* h);
+
+// Returns a prototype for the given field in "m", if it is weak.  The returned
+// message could be the linked-in message type or OpaqueMessage, if the weak
+// message is *not* linked in.  Otherwise returns NULL.
+const proto2::Message* GetFieldPrototype(
+    const proto2::Message& m,
+    const proto2::FieldDescriptor* f);
+const ::google::protobuf::Message* GetFieldPrototype(
+    const ::google::protobuf::Message& m,
+    const ::google::protobuf::FieldDescriptor* f);
+
+}  // namespace google
+}  // namespace upb
+
+#endif  // UPB_GOOGLE_PROTO2_H_