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diff --git a/tools/relocation_packer/src/packer.h b/tools/relocation_packer/src/packer.h
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+// Copyright 2014 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.
+
+// Pack relative relocations into a more compact form.
+
+#ifndef TOOLS_RELOCATION_PACKER_SRC_PACKER_H_
+#define TOOLS_RELOCATION_PACKER_SRC_PACKER_H_
+
+#include <stdint.h>
+#include <vector>
+
+#include "elf.h"
+
+namespace relocation_packer {
+
+// A RelocationPacker packs vectors of relocations into more
+// compact forms, and unpacks them to reproduce the pre-packed data.
+template <typename ELF>
+class RelocationPacker {
+ public:
+  // Pack relocations into a more compact form.
+  // |relocations| is a vector of relocation structs.
+  // |packed| is the vector of packed bytes into which relocations are packed.
+  static void PackRelocations(const std::vector<typename ELF::Rela>& relocations,
+                              std::vector<uint8_t>* packed);
+
+  // Unpack relocations from their more compact form.
+  // |packed| is the vector of packed relocations.
+  // |relocations| is a vector of unpacked relocation structs.
+  static void UnpackRelocations(const std::vector<uint8_t>& packed,
+                                std::vector<typename ELF::Rela>* relocations);
+};
+
+}  // namespace relocation_packer
+
+#endif  // TOOLS_RELOCATION_PACKER_SRC_PACKER_H_