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diff --git a/zucchini.h b/zucchini.h
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+// Copyright 2017 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.
+
+#ifndef COMPONENTS_ZUCCHINI_ZUCCHINI_H_
+#define COMPONENTS_ZUCCHINI_ZUCCHINI_H_
+
+#include "components/zucchini/buffer_view.h"
+#include "components/zucchini/patch_reader.h"
+#include "components/zucchini/patch_writer.h"
+
+// Definitions, structures, and interfaces for the Zucchini library.
+
+namespace zucchini {
+
+namespace status {
+
+// Zucchini status code, which can also be used as process exit code. Therefore
+// success is explicitly 0.
+enum Code {
+  kStatusSuccess = 0,
+  kStatusInvalidParam = 1,
+  kStatusFileReadError = 2,
+  kStatusFileWriteError = 3,
+  kStatusPatchReadError = 4,
+  kStatusPatchWriteError = 5,
+  kStatusInvalidOldImage = 6,
+  kStatusInvalidNewImage = 7,
+  kStatusFatal = 8,
+};
+
+}  // namespace status
+
+// Generates ensemble patch from |old_image| to |new_image|, and writes it to
+// |patch_writer|.
+status::Code GenerateEnsemble(ConstBufferView old_image,
+                              ConstBufferView new_image,
+                              EnsemblePatchWriter* patch_writer);
+
+// Generates raw patch from |old_image| to |new_image|, and writes it to
+// |patch_writer|.
+status::Code GenerateRaw(ConstBufferView old_image,
+                         ConstBufferView new_image,
+                         EnsemblePatchWriter* patch_writer);
+
+// Applies |patch_reader| to |old_image| to build |new_image|, which refers to
+// preallocated memory of sufficient size.
+status::Code Apply(ConstBufferView old_image,
+                   const EnsemblePatchReader& patch_reader,
+                   MutableBufferView new_image);
+
+}  // namespace zucchini
+
+#endif  // COMPONENTS_ZUCCHINI_ZUCCHINI_H_