1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include <limits>
6
7#include "mojo/public/cpp/bindings/lib/bindings_serialization.h"
8#include "mojo/public/cpp/bindings/lib/fixed_buffer.h"
9#include "testing/gtest/include/gtest/gtest.h"
10
11namespace mojo {
12namespace test {
13namespace {
14
15bool IsZero(void* p_buf, size_t size) {
16  char* buf = reinterpret_cast<char*>(p_buf);
17  for (size_t i = 0; i < size; ++i) {
18    if (buf[i] != 0)
19      return false;
20  }
21  return true;
22}
23
24// Tests that FixedBuffer allocates memory aligned to 8 byte boundaries.
25TEST(FixedBufferTest, Alignment) {
26  internal::FixedBuffer buf(internal::Align(10) * 2);
27  ASSERT_EQ(buf.size(), 16u * 2);
28
29  void* a = buf.Allocate(10);
30  ASSERT_TRUE(a);
31  EXPECT_TRUE(IsZero(a, 10));
32  EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(a) % 8);
33
34  void* b = buf.Allocate(10);
35  ASSERT_TRUE(b);
36  EXPECT_TRUE(IsZero(b, 10));
37  EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(b) % 8);
38
39  // Any more allocations would result in an assert, but we can't test that.
40}
41
42// Tests that FixedBuffer::Leak passes ownership to the caller.
43TEST(FixedBufferTest, Leak) {
44  void* ptr = NULL;
45  void* buf_ptr = NULL;
46  {
47    internal::FixedBuffer buf(8);
48    ASSERT_EQ(8u, buf.size());
49
50    ptr = buf.Allocate(8);
51    ASSERT_TRUE(ptr);
52    buf_ptr = buf.Leak();
53
54    // The buffer should point to the first element allocated.
55    // TODO(mpcomplete): Is this a reasonable expectation?
56    EXPECT_EQ(ptr, buf_ptr);
57
58    // The FixedBuffer should be empty now.
59    EXPECT_EQ(0u, buf.size());
60    EXPECT_FALSE(buf.Leak());
61  }
62
63  // Since we called Leak, ptr is still writable after FixedBuffer went out of
64  // scope.
65  memset(ptr, 1, 8);
66  free(buf_ptr);
67}
68
69#ifdef NDEBUG
70TEST(FixedBufferTest, TooBig) {
71  internal::FixedBuffer buf(24);
72
73  // A little bit too large.
74  EXPECT_EQ(reinterpret_cast<void*>(0), buf.Allocate(32));
75
76  // Move the cursor forward.
77  EXPECT_NE(reinterpret_cast<void*>(0), buf.Allocate(16));
78
79  // A lot too large.
80  EXPECT_EQ(reinterpret_cast<void*>(0),
81            buf.Allocate(std::numeric_limits<size_t>::max() - 1024u));
82
83  // A lot too large, leading to possible integer overflow.
84  EXPECT_EQ(reinterpret_cast<void*>(0),
85            buf.Allocate(std::numeric_limits<size_t>::max() - 8u));
86}
87#endif
88
89}  // namespace
90}  // namespace test
91}  // namespace mojo
92