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diff --git a/include/llvm/Wrap/wrapper_input.h b/include/llvm/Wrap/wrapper_input.h
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+++ b/include/llvm/Wrap/wrapper_input.h
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+/* Copyright 2012 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can
+ * be found in the LICENSE file.
+ */
+
+// Define a generic interface to a file/memory region that contains
+// a bitcode file, a wrapped bitcode file, or a data file to wrap.
+
+#ifndef LLVM_WRAP_WRAPPER_INPUT_H__
+#define LLVM_WRAP_WRAPPER_INPUT_H__
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include "llvm/Support/support_macros.h"
+
+// The following is a generic interface to a file/memory region that contains
+// a bitcode file, a wrapped bitcode file, or data file to wrap.
+class WrapperInput {
+ public:
+  WrapperInput() {}
+  virtual ~WrapperInput() {}
+  // Tries to read the requested number of bytes into the buffer. Returns the
+  // actual number of bytes read.
+  virtual size_t Read(uint8_t* buffer, size_t wanted) = 0;
+  // Returns true if at end of input. Note: May return false until
+  // Read is called, and returns 0.
+  virtual bool AtEof() = 0;
+  // Returns the size of the input (in bytes).
+  virtual off_t Size() = 0;
+  // Moves to the given offset within the input region. Returns false
+  // if unable to move to that position.
+  virtual bool Seek(uint32_t pos) = 0;
+ private:
+  DISALLOW_CLASS_COPY_AND_ASSIGN(WrapperInput);
+};
+
+#endif  // LLVM_WRAP_WRAPPER_INPUT_H__