Refactor rel32 searching process for x64 to make it more similar to x86.

courgette/rel32_finder_x64.h

Index: courgette/rel32_finder_x64.h
diff --git a/courgette/rel32_finder_x64.h b/courgette/rel32_finder_x64.h
new file mode 100644
index 0000000000000000000000000000000000000000..d41a711097c703eee2e89f2e5309482e0f558f99
--- /dev/null
+++ b/courgette/rel32_finder_x64.h
@@ -0,0 +1,36 @@
+// Copyright 2016 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 COURGETTE_REL32_FINDER_X64_H_
+#define COURGETTE_REL32_FINDER_X64_H_
+
+#include <stdint.h>
+
+#include <vector>
+
+#include "courgette/image_utils.h"
+#include "courgette/rel32_finder.h"
+
+namespace courgette {
+
+// This implementation performs naive scan for opcodes having rel32 as
+// arguments, disregarding instruction alignment.
+class Rel32FinderX64 : public Rel32Finder {
+ public:
+  Rel32FinderX64(RVA relocs_start_rva, RVA relocs_end_rva, RVA size_of_image);
+  ~Rel32FinderX64() override = default;
+
+  void Find(const uint8_t* start_pointer,
+            const uint8_t* end_pointer,
+            RVA start_rva,
+            RVA end_rva,
+            const std::vector<RVA>& abs32_locations) override;
+
+ private:
+  uint32_t size_of_image_;
+};
+
+}  // namespace courgette
+
+#endif  // COURGETTE_REL32_FINDER_X64_H_