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// 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 FixedBuffer allocates memory aligned to 8 byte boundaries.
TEST(FixedBufferTest, Alignment) {
internal::FixedBuffer 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);
void* b = buf.Allocate(10);
ASSERT_TRUE(b);
EXPECT_TRUE(IsZero(b, 10));
EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(b) % 8);
// Any more allocations would result in an assert, but we can't test that.
}
// Tests that FixedBuffer::Leak passes ownership to the caller.
TEST(FixedBufferTest, Leak) {
void* ptr = nullptr;
void* buf_ptr = nullptr;
{
internal::FixedBuffer buf(8);
ASSERT_EQ(8u, buf.size());
ptr = buf.Allocate(8);
ASSERT_TRUE(ptr);
buf_ptr = buf.Leak();
// The buffer should point to the first element allocated.
// TODO(mpcomplete): Is this a reasonable expectation?
EXPECT_EQ(ptr, buf_ptr);
// The FixedBuffer should be empty now.
EXPECT_EQ(0u, buf.size());
EXPECT_FALSE(buf.Leak());
}
// Since we called Leak, ptr is still writable after FixedBuffer went out of
// scope.
memset(ptr, 1, 8);
free(buf_ptr);
}
#ifdef NDEBUG
TEST(FixedBufferTest, TooBig) {
internal::FixedBuffer buf(24);
// A little bit too large.
EXPECT_EQ(reinterpret_cast<void*>(0), buf.Allocate(32));
// Move the cursor forward.
EXPECT_NE(reinterpret_cast<void*>(0), buf.Allocate(16));
// A lot too large.
EXPECT_EQ(reinterpret_cast<void*>(0),
buf.Allocate(std::numeric_limits<size_t>::max() - 1024u));
// 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
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