Vboot Reference: Refactor Code.

src/platform/vboot_reference/include/utility.h

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* Helper functions/wrappers for memory allocations, manipulation and
  * comparison.
  */
 
 #ifndef VBOOT_REFERENCE_UTILITY_H_
@@ skipping 23 matching lines @@
 int SafeMemcmp(const void* s1, const void* s2, size_t n);
 
 /* Track remaining data to be read in a buffer. */
 typedef struct MemcpyState {
   void* remaining_buf;
   int remaining_len;
 } MemcpyState;
 
 /* Copy [len] bytes into [dst] only if there's enough data to read according
  * to [state].
- * On success, return [dst] and update [state]..
+ * On success, return [dst] and update [state].
  * On failure, return NULL, set remaining len in state to -1.
  *
  * Useful for iterating through a binary blob to populate a struct. After the
  * first failure (buffer overrun), successive calls will always fail.
  */
 void* StatefulMemcpy(MemcpyState* state, void* dst, int len);
 
+/* Like StatefulMemcpy() but copies in the opposite direction, populating
+ * data from [src] into the buffer encapsulated in state [state].
+ * On success, return [src] and update [state].
+ * On failure, return NULL, set remaining_len in state to -1.
+ *
+ * Useful for iterating through a structure to populate a binary blob. After the
+ * first failure (buffer overrun), successive calls will always fail.
+ */
+const void* StatefulMemcpy_r(MemcpyState* state, const void* src, int len);
 
 #endif  /* VBOOT_REFERENCE_UTILITY_H_ */