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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_POOL_H__
+#define GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_POOL_H__
+
+#include <Python.h>
+
+#include <google/protobuf/stubs/hash.h>
+#include <google/protobuf/descriptor.h>
+
+namespace google {
+namespace protobuf {
+namespace python {
+
+struct PyMessageFactory;
+
+// The (meta) type of all Messages classes.
+struct CMessageClass;
+
+// Wraps operations to the global DescriptorPool which contains information
+// about all messages and fields.
+//
+// There is normally one pool per process. We make it a Python object only
+// because it contains many Python references.
+// TODO(amauryfa): See whether such objects can appear in reference cycles, and
+// consider adding support for the cyclic GC.
+//
+// "Methods" that interacts with this DescriptorPool are in the cdescriptor_pool
+// namespace.
+typedef struct PyDescriptorPool {
+  PyObject_HEAD
+
+  // The C++ pool containing Descriptors.
+  DescriptorPool* pool;
+
+  // The C++ pool acting as an underlay. Can be NULL.
+  // This pointer is not owned and must stay alive.
+  const DescriptorPool* underlay;
+
+  // The C++ descriptor database used to fetch unknown protos. Can be NULL.
+  // This pointer is owned.
+  const DescriptorDatabase* database;
+
+  // The preferred MessageFactory to be used by descriptors.
+  // TODO(amauryfa): Don't create the Factory from the DescriptorPool, but
+  // use the one passed while creating message classes. And remove this member.
+  PyMessageFactory* py_message_factory;
+
+  // Cache the options for any kind of descriptor.
+  // Descriptor pointers are owned by the DescriptorPool above.
+  // Python objects are owned by the map.
+  hash_map<const void*, PyObject*>* descriptor_options;
+} PyDescriptorPool;
+
+
+extern PyTypeObject PyDescriptorPool_Type;
+
+namespace cdescriptor_pool {
+
+
+// Looks up a message by name.
+// Returns a message Descriptor, or NULL if not found.
+const Descriptor* FindMessageTypeByName(PyDescriptorPool* self,
+                                        const string& name);
+
+// The functions below are also exposed as methods of the DescriptorPool type.
+
+// Looks up a message by name. Returns a PyMessageDescriptor corresponding to
+// the field on success, or NULL on failure.
+//
+// Returns a new reference.
+PyObject* FindMessageByName(PyDescriptorPool* self, PyObject* name);
+
+// Looks up a field by name. Returns a PyFieldDescriptor corresponding to
+// the field on success, or NULL on failure.
+//
+// Returns a new reference.
+PyObject* FindFieldByName(PyDescriptorPool* self, PyObject* name);
+
+// Looks up an extension by name. Returns a PyFieldDescriptor corresponding
+// to the field on success, or NULL on failure.
+//
+// Returns a new reference.
+PyObject* FindExtensionByName(PyDescriptorPool* self, PyObject* arg);
+
+// Looks up an enum type by name. Returns a PyEnumDescriptor corresponding
+// to the field on success, or NULL on failure.
+//
+// Returns a new reference.
+PyObject* FindEnumTypeByName(PyDescriptorPool* self, PyObject* arg);
+
+// Looks up a oneof by name. Returns a COneofDescriptor corresponding
+// to the oneof on success, or NULL on failure.
+//
+// Returns a new reference.
+PyObject* FindOneofByName(PyDescriptorPool* self, PyObject* arg);
+
+}  // namespace cdescriptor_pool
+
+// Retrieve the global descriptor pool owned by the _message module.
+// This is the one used by pb2.py generated modules.
+// Returns a *borrowed* reference.
+// "Default" pool used to register messages from _pb2.py modules.
+PyDescriptorPool* GetDefaultDescriptorPool();
+
+// Retrieve the python descriptor pool owning a C++ descriptor pool.
+// Returns a *borrowed* reference.
+PyDescriptorPool* GetDescriptorPool_FromPool(const DescriptorPool* pool);
+
+// Initialize objects used by this module.
+bool InitDescriptorPool();
+
+}  // namespace python
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_POOL_H__