C++ bindings: A struct's Deserialize() now does validation before deserializing.

mojo/public/cpp/bindings/tests/buffer_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <limits>
 
 #include "mojo/public/cpp/bindings/lib/bindings_serialization.h"
 #include "mojo/public/cpp/bindings/lib/fixed_buffer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {
 namespace {
 
 bool IsZero(void* p_buf, size_t size) {
   char* buf = reinterpret_cast<char*>(p_buf);
   for (size_t i = 0; i < size; ++i) {
     if (buf[i] != 0)
       return false;
   }
   return true;
 }
 
+// Tests that you can create a FixedBuffer whose underlying buffer size is not
+// a multiple of 8.
+TEST(FixedBufferTest, UnAlignedBufferSized) {
+  char char_buf[10] = {};
+  internal::FixedBuffer fixed_buf;
+  fixed_buf.Initialize(char_buf, sizeof(char_buf));
+}
+
 // Tests that FixedBuffer allocates memory aligned to 8 byte boundaries.
 TEST(FixedBufferTest, Alignment) {
   internal::FixedBufferForTesting buf(internal::Align(10) * 2);
   ASSERT_EQ(buf.size(), 16u * 2);
 
   void* a = buf.Allocate(10);
   ASSERT_TRUE(a);
   EXPECT_TRUE(IsZero(a, 10));
   EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(a) % 8);
 
@@ skipping 48 matching lines @@
 
   // A lot too large, leading to possible integer overflow.
   EXPECT_EQ(reinterpret_cast<void*>(0),
             buf.Allocate(std::numeric_limits<size_t>::max() - 8u));
 }
 #endif
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo