Have peek32 return uint32_t& to make it harder to look at more than 4 bytes.

src/core/SkWriteBuffer.cpp

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkWriteBuffer.h"
 #include "SkBitmap.h"
@@ skipping 303 matching lines @@
     }
 
     // make room for the size of the flattened object
     (void)fWriter.reserve(sizeof(uint32_t));
     // record the current size, so we can subtract after the object writes.
     uint32_t offset = fWriter.bytesWritten();
     // now flatten the object
     flattenable->flatten(*this);
     uint32_t objSize = fWriter.bytesWritten() - offset;
     // record the obj's size
-    *fWriter.peek32(offset - sizeof(uint32_t)) = objSize;
+    fWriter.write32At(offset - sizeof(uint32_t), objSize);
 }