VBoot Reference: 18 Exabytes ought to be enough for everybody

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 26 matching lines @@
 
 /* Compare [n] bytes starting at [s1] with [s2] and return 0 if they match,
  * 1 if they don't. Time taken to perform the comparison is only dependent on
  * [n] and not on the relationship of the match between [s1] and [s2].
  */
 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;
-  uint64_t remaining_len;
+  uint64_t remaining_len;  /* Remaining length of the buffer. */
+  uint8_t overrun;  /* Flag set to 1 when an overrun occurs. */
 } 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 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);
+void* StatefulMemcpy(MemcpyState* state, void* dst, uint64_t 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);
+const void* StatefulMemcpy_r(MemcpyState* state, const void* src, uint64_t len);
 
 #endif  /* VBOOT_REFERENCE_UTILITY_H_ */