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diff --git a/src/google/protobuf/testing/file.h b/src/google/protobuf/testing/file.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)
+// emulates google3/file/base/file.h
+
+#ifndef GOOGLE_PROTOBUF_TESTING_FILE_H__
+#define GOOGLE_PROTOBUF_TESTING_FILE_H__
+
+#include <google/protobuf/stubs/common.h>
+
+namespace google {
+namespace protobuf {
+
+const int DEFAULT_FILE_MODE = 0777;
+
+// Protocol buffer code only uses a couple static methods of File, and only
+// in tests.
+class File {
+ public:
+ // Check if the file exists.
+ static bool Exists(const string& name);
+
+ // Read an entire file to a string. Return true if successful, false
+ // otherwise.
+ static bool ReadFileToString(const string& name, string* output);
+
+ // Same as above, but crash on failure.
+ static void ReadFileToStringOrDie(const string& name, string* output);
+
+ // Create a file and write a string to it.
+ static bool WriteStringToFile(const string& contents,
+ const string& name);
+
+ // Same as above, but crash on failure.
+ static void WriteStringToFileOrDie(const string& contents,
+ const string& name);
+
+ // Create a directory.
+ static bool CreateDir(const string& name, int mode);
+
+ // Create a directory and all parent directories if necessary.
+ static bool RecursivelyCreateDir(const string& path, int mode);
+
+ // If "name" is a file, we delete it. If it is a directory, we
+ // call DeleteRecursively() for each file or directory (other than
+ // dot and double-dot) within it, and then delete the directory itself.
+ // The "dummy" parameters have a meaning in the original version of this
+ // method but they are not used anywhere in protocol buffers.
+ static void DeleteRecursively(const string& name,
+ void* dummy1, void* dummy2);
+
+ // Change working directory to given directory.
+ static bool ChangeWorkingDirectory(const string& new_working_directory);
+
+ static bool GetContents(
+ const string& name, string* output, bool /*is_default*/) {
+ return ReadFileToString(name, output);
+ }
+
+ static bool SetContents(
+ const string& name, const string& contents, bool /*is_default*/) {
+ return WriteStringToFile(contents, name);
+ }
+
+ private:
+ GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(File);
+};
+
+} // namespace protobuf
+} // namespace google
+
+#endif // GOOGLE_PROTOBUF_TESTING_FILE_H__