1 files changed, 15 insertions, 6 deletions

diff --git a/applypatch/imgdiff.h b/applypatch/include/applypatch/imgdiff.h
index f2069b4f3..22cbd4fa0 100644
--- a/applypatch/imgdiff.h
+++ b/applypatch/include/applypatch/imgdiff.h
@@ -14,17 +14,26 @@
  * limitations under the License.
  */
 
+#ifndef _APPLYPATCH_IMGDIFF_H
+#define _APPLYPATCH_IMGDIFF_H
+
+#include <stddef.h>
+
 // Image patch chunk types
-#define CHUNK_NORMAL   0
-#define CHUNK_GZIP     1   // version 1 only
-#define CHUNK_DEFLATE  2   // version 2 only
-#define CHUNK_RAW      3   // version 2 only
+#define CHUNK_NORMAL 0
+#define CHUNK_GZIP 1     // version 1 only
+#define CHUNK_DEFLATE 2  // version 2 only
+#define CHUNK_RAW 3      // version 2 only
 
 // The gzip header size is actually variable, but we currently don't
 // support gzipped data with any of the optional fields, so for now it
 // will always be ten bytes.  See RFC 1952 for the definition of the
 // gzip format.
-#define GZIP_HEADER_LEN   10
+static constexpr size_t GZIP_HEADER_LEN = 10;
 
 // The gzip footer size really is fixed.
-#define GZIP_FOOTER_LEN   8
+static constexpr size_t GZIP_FOOTER_LEN = 8;
+
+int imgdiff(int argc, const char** argv);
+
+#endif  // _APPLYPATCH_IMGDIFF_H