Checking structure sizes before reading them from memory to avoid overflowing the buffer's stream.

include/core/SkRRect.h

Index: include/core/SkRRect.h
diff --git a/include/core/SkRRect.h b/include/core/SkRRect.h
index 32d62856bc90fddec1a33196f8f691ce8506de68..68bac5f501a94144e27037cfd684dcf573cf7ea8 100644
--- a/include/core/SkRRect.h
+++ b/include/core/SkRRect.h
@@ -268,14 +268,19 @@ public:
      *  write kSizeInMemory bytes, and that value is guaranteed to always be
      *  a multiple of 4. Return kSizeInMemory.
      */
-    uint32_t writeToMemory(void* buffer) const;
+    size_t writeToMemory(void* buffer) const;
 
     /**
-     *  Read the rrect from the specified buffer. This is guaranteed to always
-     *  read kSizeInMemory bytes, and that value is guaranteed to always be
-     *  a multiple of 4. Return kSizeInMemory.
+     * Reads the rrect from the specified buffer
+     *
+     * If the specified buffer is large enough, this will read kSizeInMemory bytes,
+     * and that value is guaranteed to always be a multiple of 4.
+     *
+     * @param buffer Memory to read from
+     * @param length Amount of memory available in the buffer
+     * @return kSizeInMemory or 0 if there was not enough memory available
      */
-    uint32_t readFromMemory(const void* buffer);
+    size_t readFromMemory(const void* buffer, size_t length);
 
 private:
     SkRect fRect;