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diff --git a/courgette/simple_delta.h b/courgette/simple_delta.h
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+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Byte level differential compression algorithm used by Courgette.
+
+#ifndef COURGETTE_SIMPLE_DELTA_H_
+#define COURGETTE_SIMPLE_DELTA_H_
+
+#include "courgette/courgette.h"
+#include "courgette/streams.h"
+
+namespace courgette {
+
+Status ApplySimpleDelta(SourceStream* old, SourceStream* delta,
+                        SinkStream* target);
+
+Status GenerateSimpleDelta(SourceStream* old, SourceStream* target,
+                           SinkStream* delta);
+
+}  // namespace courgette
+
+#endif  // COURGETTE_SIMPLE_DELTA_H_