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diff --git a/python/google/protobuf/pyext/descriptor.h b/python/google/protobuf/pyext/descriptor.h
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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.
+
+// Author: petar@google.com (Petar Petrov)
+
+#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_H__
+#define GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_H__
+
+#include <Python.h>
+#include <structmember.h>
+
+#include <google/protobuf/descriptor.h>
+
+#if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
+typedef int Py_ssize_t;
+#define PY_SSIZE_T_MAX INT_MAX
+#define PY_SSIZE_T_MIN INT_MIN
+#endif
+
+namespace google {
+namespace protobuf {
+namespace python {
+
+typedef struct CFieldDescriptor {
+  PyObject_HEAD
+
+  // The proto2 descriptor that this object represents.
+  const google::protobuf::FieldDescriptor* descriptor;
+
+  // Reference to the original field object in the Python DESCRIPTOR.
+  PyObject* descriptor_field;
+} CFieldDescriptor;
+
+typedef struct {
+  PyObject_HEAD
+
+  const google::protobuf::DescriptorPool* pool;
+} CDescriptorPool;
+
+extern PyTypeObject CFieldDescriptor_Type;
+
+extern PyTypeObject CDescriptorPool_Type;
+
+namespace cdescriptor_pool {
+
+// Looks up a field by name. Returns a CDescriptor corresponding to
+// the field on success, or NULL on failure.
+//
+// Returns a new reference.
+PyObject* FindFieldByName(CDescriptorPool* self, PyObject* name);
+
+// Looks up an extension by name. Returns a CDescriptor corresponding
+// to the field on success, or NULL on failure.
+//
+// Returns a new reference.
+PyObject* FindExtensionByName(CDescriptorPool* self, PyObject* arg);
+
+}  // namespace cdescriptor_pool
+
+PyObject* Python_NewCDescriptorPool(PyObject* ignored, PyObject* args);
+PyObject* Python_BuildFile(PyObject* ignored, PyObject* args);
+bool InitDescriptor();
+google::protobuf::DescriptorPool* GetDescriptorPool();
+
+}  // namespace python
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_H__