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diff --git a/sandbox/src/sidestep_resolver.h b/sandbox/src/sidestep_resolver.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef SANDBOX_SRC_SIDESTEP_RESOLVER_H__
+#define SANDBOX_SRC_SIDESTEP_RESOLVER_H__
+
+#include "base/basictypes.h"
+#include "sandbox/src/nt_internals.h"
+#include "sandbox/src/resolver.h"
+
+namespace sandbox {
+
+// This is the concrete resolver used to perform sidestep interceptions.
+class SidestepResolverThunk : public ResolverThunk {
+ public:
+  SidestepResolverThunk() {}
+  virtual ~SidestepResolverThunk() {}
+
+  // Implementation of Resolver::Setup.
+  virtual NTSTATUS Setup(const void* target_module,
+                         const void* interceptor_module,
+                         const char* target_name,
+                         const char* interceptor_name,
+                         const void* interceptor_entry_point,
+                         void* thunk_storage,
+                         size_t storage_bytes,
+                         size_t* storage_used);
+
+  // Implementation of Resolver::GetThunkSize.
+  virtual size_t GetThunkSize() const;
+
+ private:
+  DISALLOW_EVIL_CONSTRUCTORS(SidestepResolverThunk);
+};
+
+// This is the concrete resolver used to perform smart sidestep interceptions.
+// This means basically a sidestep interception that skips the interceptor when
+// the caller resides on the same dll being intercepted. It is intended as
+// a helper only, because that determination is not infallible.
+class SmartSidestepResolverThunk : public SidestepResolverThunk {
+ public:
+  SmartSidestepResolverThunk() {}
+  virtual ~SmartSidestepResolverThunk() {}
+
+  // Implementation of Resolver::Setup.
+  virtual NTSTATUS Setup(const void* target_module,
+                         const void* interceptor_module,
+                         const char* target_name,
+                         const char* interceptor_name,
+                         const void* interceptor_entry_point,
+                         void* thunk_storage,
+                         size_t storage_bytes,
+                         size_t* storage_used);
+
+  // Implementation of Resolver::GetThunkSize.
+  virtual size_t GetThunkSize() const;
+
+ private:
+  // Performs the actual call to the interceptor if the conditions are correct
+  // (as determined by IsInternalCall).
+  static void SmartStub();
+
+  // Returns true if return_address is inside the module loaded at base.
+  static bool IsInternalCall(const void* base, void* return_address);
+
+  DISALLOW_EVIL_CONSTRUCTORS(SmartSidestepResolverThunk);
+};
+
+}  // namespace sandbox
+
+
+#endif  // SANDBOX_SRC_SIDESTEP_RESOLVER_H__