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

include/core/SkReader32.h

Index: include/core/SkReader32.h
diff --git a/include/core/SkReader32.h b/include/core/SkReader32.h
index 7a8d22a80c166c82539f05fe9d83186269416762..71101c333474bb70ad642052d0f3025fa23df924 100644
--- a/include/core/SkReader32.h
+++ b/include/core/SkReader32.h
@@ -107,13 +107,13 @@ public:
     uint32_t readU32() { return this->readInt(); }
 
     void readPath(SkPath* path) {
-        size_t size = path->readFromMemory(this->peek());
+        size_t size = path->readFromMemory(this->peek(), this->available());
         SkASSERT(SkAlign4(size) == size);
         (void)this->skip(size);
     }
 
     void readMatrix(SkMatrix* matrix) {
-        size_t size = matrix->readFromMemory(this->peek());
+        size_t size = matrix->readFromMemory(this->peek(), this->available());
         SkASSERT(SkAlign4(size) == size);
         (void)this->skip(size);
     }
@@ -124,7 +124,7 @@ public:
     }
 
     void readRegion(SkRegion* rgn) {
-        size_t size = rgn->readFromMemory(this->peek());
+        size_t size = rgn->readFromMemory(this->peek(), this->available());
         SkASSERT(SkAlign4(size) == size);
         (void)this->skip(size);
     }