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diff --git a/src/system_wrappers/interface/file_wrapper.h b/src/system_wrappers/interface/file_wrapper.h
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+++ b/src/system_wrappers/interface/file_wrapper.h
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+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_
+
+#include "common_types.h"
+#include "typedefs.h"
+
+// Implementation of an InStream and OutStream that can read (exclusive) or
+// write from/to a file.
+
+namespace webrtc {
+class FileWrapper : public InStream, public OutStream
+{
+public:
+    enum { kMaxFileNameSize = 1024};
+    enum { kFileMaxTextMessageSize = 1024};
+
+    // Factory method. Constructor disabled.
+    static FileWrapper* Create();
+
+    // Returns true if a file has been opened.
+    virtual bool Open() const = 0;
+
+    // Opens a file in read or write mode, decided by the readOnly parameter.
+    virtual WebRtc_Word32 OpenFile(const WebRtc_Word8* fileNameUTF8,
+                                   const bool readOnly,
+                                   const bool loop = false,
+                                   const bool text = false) = 0;
+
+    virtual WebRtc_Word32 CloseFile() = 0;
+
+    // Limits the file size.
+    virtual WebRtc_Word32 SetMaxFileSize(WebRtc_Word32 bytes)  = 0;
+
+    // Flush any pending writes.
+    virtual WebRtc_Word32 Flush() = 0;
+
+    // Returns the opened file's name in fileNameUTF8. size is the allocated
+    // size of fileNameUTF8. The name will be truncated if the size of
+    // fileNameUTF8 is to small.
+    virtual WebRtc_Word32 FileName(WebRtc_Word8* fileNameUTF8,
+                                   WebRtc_UWord32 size) const = 0;
+
+    // Write text to the opened file. The written text can contain plain text
+    // and text with type specifiers in the same way as sprintf works.
+    virtual WebRtc_Word32 WriteText(const WebRtc_Word8* text, ...) = 0;
+
+    // Reads len number of bytes from buf to file.
+    virtual int Read(void* buf, int len) = 0;
+
+    // Writes len number of bytes to buf from file. Please note that the actual
+    // writing to file may happen some time later. Call flush to force a write
+    // to take affect
+    virtual bool Write(const void *buf,int len) = 0;
+
+    // Rewinds the file to the start. Only available when OpenFile() has been
+    // called with loop argument set to true. Or readOnly argument has been set
+    // to false.
+    virtual int Rewind() = 0;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_