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diff --git a/src/google/protobuf/compiler/csharp/csharp_writer.h b/src/google/protobuf/compiler/csharp/csharp_writer.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: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_CSHARP_WRITER_H__
+#define GOOGLE_PROTOBUF_COMPILER_CSHARP_WRITER_H__
+
+#include <string>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/compiler/code_generator.h>
+#include <google/protobuf/io/printer.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace csharp {
+
+// Simple wrapper around Printer that supports customizable line endings
+// and number-based variables (e.g. $0$).
+class Writer {
+ public:
+  Writer(io::Printer* printer);
+  ~Writer();
+
+  void Indent();
+  void Outdent();
+
+  void Write(const char* text);
+
+  void Write(const char* text, const string& value0);
+
+  void Write(const char* text, const string& value0, const string& value1);
+
+  void Write(const char* text, const string& value0, const string& value1,
+             const string& value2);
+
+  void Write(const char* text, const string& value0, const string& value1,
+             const string& value2, const string& value3);
+
+  void WriteLine();
+
+  void WriteLine(const char* text);
+
+  void WriteLine(const char* text, const string& value0);
+
+  void WriteLine(const char* text, const string& value0, const string& value1);
+
+  void WriteLine(const char* text, const string& value0, const string& value1,
+                 const string& value2);
+
+  void WriteLine(const char* text, const string& value0, const string& value1,
+                 const string& value2, const string& value3);
+ private:
+  io::Printer* printer_;
+  const char* newline_;
+};
+
+}  // namespace csharp
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_CSHARP_WRITER_H__