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diff --git a/include/bsdiff/compressor_interface.h b/include/bsdiff/compressor_interface.h
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+++ b/include/bsdiff/compressor_interface.h
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+// Copyright 2017 The Chromium OS 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 _BSDIFF_COMPRESSOR_INTERFACE_H_
+#define _BSDIFF_COMPRESSOR_INTERFACE_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <memory>
+#include <vector>
+
+#include "bsdiff/constants.h"
+
+namespace bsdiff {
+
+class CompressorInterface {
+ public:
+  virtual ~CompressorInterface() = default;
+
+  // Compress and write |size| bytes of input data starting from |buf|.
+  virtual bool Write(const uint8_t* buf, size_t size) = 0;
+
+  // Finish the compression step.
+  virtual bool Finish() = 0;
+
+  // Return the compressed data. This method must be only called after Finish().
+  virtual const std::vector<uint8_t>& GetCompressedData() = 0;
+
+  // Return the type of the current compressor.
+  virtual CompressorType Type() const = 0;
+
+ protected:
+  CompressorInterface() = default;
+};
+
+}  // namespace bsdiff
+
+#endif  // _BSDIFF_COMPRESSOR_INTERFACE_H_