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diff --git a/runtime/base/unix_file/random_access_file_utils.h b/runtime/base/unix_file/random_access_file_utils.h
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+++ b/runtime/base/unix_file/random_access_file_utils.h
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+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BASE_UNIX_FILE_RANDOM_ACCESS_FILE_UTILS_H_
+#define BASE_UNIX_FILE_RANDOM_ACCESS_FILE_UTILS_H_
+
+namespace unix_file {
+
+class RandomAccessFile;
+
+// Copies from 'src' to 'dst'. Reads all the data from 'src', and writes it
+// to 'dst'. Not thread-safe. Neither file will be closed.
+bool CopyFile(const RandomAccessFile& src, RandomAccessFile* dst);
+
+}  // namespace unix_file
+
+#endif  // BASE_UNIX_FILE_RANDOM_ACCESS_FILE_UTILS_H_