diff --git a/src/oat.h b/src/oat.h
new file mode 100644
index 0000000..ca3e9e0
--- /dev/null
+++ b/src/oat.h
@@ -0,0 +1,41 @@
+// Copyright 2011 Google Inc. All Rights Reserved.
+
+#ifndef ART_SRC_OAT_H_
+#define ART_SRC_OAT_H_
+
+#include <vector>
+
+#include "dex_file.h"
+#include "macros.h"
+
+namespace art {
+
+class PACKED OatHeader {
+ public:
+  OatHeader() {}
+  OatHeader(const std::vector<const DexFile*>* dex_files);
+
+  bool IsValid() const;
+  const char* GetMagic() const;
+  uint32_t GetChecksum() const;
+  void UpdateChecksum(const void* data, size_t length);
+  uint32_t GetDexFileCount() const;
+  uint32_t GetExecutableOffset() const;
+  void SetExecutableOffset(uint32_t executable_offset);
+
+ private:
+  static const uint8_t kOatMagic[4];
+  static const uint8_t kOatVersion[4];
+
+  uint8_t magic_[4];
+  uint8_t version_[4];
+  uint32_t adler32_checksum_;
+  uint32_t dex_file_count_;
+  uint32_t executable_offset_;
+
+  DISALLOW_COPY_AND_ASSIGN(OatHeader);
+};
+
+}  // namespace art
+
+#endif  // ART_SRC_OAT_H_