VBoot Reference: 18 Exabytes ought to be enough for everybody

src/platform/vboot_reference/include/utility.h

Index: src/platform/vboot_reference/include/utility.h
diff --git a/src/platform/vboot_reference/include/utility.h b/src/platform/vboot_reference/include/utility.h
index 79713477c882e71b5d3735de37a6eba70fab16d1..429223cdf1ae571367982a7553b9ebfcee8f1931 100644
--- a/src/platform/vboot_reference/include/utility.h
+++ b/src/platform/vboot_reference/include/utility.h
@@ -44,7 +44,8 @@ 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
@@ -55,7 +56,7 @@ typedef struct MemcpyState {
  * 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].
@@ -65,6 +66,6 @@ void* StatefulMemcpy(MemcpyState* state, void* dst, int len);
  * 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_ */