Initial error handling code

src/core/SkSecureReadBuffer.h

Index: src/core/SkSecureReadBuffer.h
diff --git a/src/core/SkOrderedReadBuffer.h b/src/core/SkSecureReadBuffer.h
similarity index 87%
copy from src/core/SkOrderedReadBuffer.h
copy to src/core/SkSecureReadBuffer.h
index 556fce8b41495a4790bf48074dcb3ed951611439..67cb26c1fe8c0211a4e3a53613340febeb8fde9f 100644
--- a/src/core/SkOrderedReadBuffer.h
+++ b/src/core/SkSecureReadBuffer.h
@@ -1,13 +1,12 @@
-
 /*
- * Copyright 2011 Google Inc.
+ * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-#ifndef SkOrderedReadBuffer_DEFINED
-#define SkOrderedReadBuffer_DEFINED
+#ifndef SkSecureReadBuffer_DEFINED
+#define SkSecureReadBuffer_DEFINED
 
 #include "SkRefCnt.h"
 #include "SkBitmapHeap.h"
@@ -22,21 +21,19 @@ class SkBitmap;
     #define DEBUG_NON_DETERMINISTIC_ASSERT
 #endif
 
-class SkOrderedReadBuffer : public SkFlattenableReadBuffer {
+class SkSecureReadBuffer : public SkFlattenableReadBuffer {
 public:
-    SkOrderedReadBuffer();
-    SkOrderedReadBuffer(const void* data, size_t size);
-    SkOrderedReadBuffer(SkStream* stream);
-    virtual ~SkOrderedReadBuffer();
-
-    virtual SkOrderedReadBuffer* getOrderedBinaryBuffer() SK_OVERRIDE { return this; }
+    SkSecureReadBuffer();
+    SkSecureReadBuffer(const void* data, size_t size);
+    SkSecureReadBuffer(SkStream* stream);
+    virtual ~SkSecureReadBuffer();
 
     SkReader32* getReader32() { return &fReader; }
 
     uint32_t size() { return fReader.size(); }
     uint32_t offset() { return fReader.offset(); }
     bool eof() { return fReader.eof(); }
-    const void* skip(size_t size) { return fReader.skip(size); }
+    const void* skip(size_t size);
 
     // primitives
     virtual bool readBool() SK_OVERRIDE;
@@ -113,6 +110,12 @@ public:
     }
 
 private:
+    void setMemory(const void* data, size_t size);
+
+    static bool ptr_align_4(const void* ptr) {
+        return (((const char*)ptr - (const char*)NULL) & 3) == 0;
+    }
+
     SkReader32 fReader;
     void* fMemoryPtr;
 
@@ -135,4 +138,4 @@ private:
     typedef SkFlattenableReadBuffer INHERITED;
 };
 
-#endif // SkOrderedReadBuffer_DEFINED
+#endif // SkSecureReadBuffer_DEFINED