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// Copyright (c) 2013 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 "net/spdy/spdy_read_queue.h"
#include <algorithm>
#include <cstddef>
#include <string>
#include "base/memory/scoped_ptr.h"
#include "base/stl_util.h"
#include "net/spdy/spdy_buffer.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace {
const char kData[] = "SPDY read queue test data.\0Some more data.";
const size_t kDataSize = arraysize(kData);
// Enqueues |data| onto |queue| in chunks of at most |max_buffer_size|
// bytes.
void EnqueueString(const std::string& data,
size_t max_buffer_size,
SpdyReadQueue* queue) {
ASSERT_GT(data.size(), 0u);
ASSERT_GT(max_buffer_size, 0u);
size_t old_total_size = queue->GetTotalSize();
for (size_t i = 0; i < data.size();) {
size_t buffer_size = std::min(data.size() - i, max_buffer_size);
queue->Enqueue(
scoped_ptr<SpdyBuffer>(new SpdyBuffer(data.data() + i, buffer_size)));
i += buffer_size;
EXPECT_FALSE(queue->IsEmpty());
EXPECT_EQ(old_total_size + i, queue->GetTotalSize());
}
}
// Dequeues all bytes in |queue| in chunks of at most
// |max_buffer_size| bytes and returns the data as a string.
std::string DrainToString(size_t max_buffer_size, SpdyReadQueue* queue) {
std::string data;
// Pad the buffer so we can detect out-of-bound writes.
size_t padding = std::max(static_cast<size_t>(4096), queue->GetTotalSize());
size_t buffer_size_with_padding = padding + max_buffer_size + padding;
scoped_ptr<char[]> buffer(new char[buffer_size_with_padding]);
std::memset(buffer.get(), 0, buffer_size_with_padding);
char* buffer_data = buffer.get() + padding;
while (!queue->IsEmpty()) {
size_t old_total_size = queue->GetTotalSize();
EXPECT_GT(old_total_size, 0u);
size_t dequeued_bytes = queue->Dequeue(buffer_data, max_buffer_size);
// Make sure |queue| doesn't write past either end of its given
// boundaries.
for (int i = 1; i <= static_cast<int>(padding); ++i) {
EXPECT_EQ('\0', buffer_data[-i]) << -i;
}
for (size_t i = 0; i < padding; ++i) {
EXPECT_EQ('\0', buffer_data[max_buffer_size + i]) << i;
}
data.append(buffer_data, dequeued_bytes);
EXPECT_EQ(dequeued_bytes, std::min(max_buffer_size, dequeued_bytes));
EXPECT_EQ(queue->GetTotalSize(), old_total_size - dequeued_bytes);
}
EXPECT_TRUE(queue->IsEmpty());
return data;
}
// Enqueue a test string with the given enqueue/dequeue max buffer
// sizes.
void RunEnqueueDequeueTest(size_t enqueue_max_buffer_size,
size_t dequeue_max_buffer_size) {
std::string data(kData, kDataSize);
SpdyReadQueue read_queue;
EnqueueString(data, enqueue_max_buffer_size, &read_queue);
const std::string& drained_data =
DrainToString(dequeue_max_buffer_size, &read_queue);
EXPECT_EQ(data, drained_data);
}
class SpdyReadQueueTest : public ::testing::Test {};
// Call RunEnqueueDequeueTest() with various buffer size combinatinos.
TEST_F(SpdyReadQueueTest, LargeEnqueueAndDequeueBuffers) {
RunEnqueueDequeueTest(2 * kDataSize, 2 * kDataSize);
}
TEST_F(SpdyReadQueueTest, OneByteEnqueueAndDequeueBuffers) {
RunEnqueueDequeueTest(1, 1);
}
TEST_F(SpdyReadQueueTest, CoprimeBufferSizes) {
RunEnqueueDequeueTest(2, 3);
RunEnqueueDequeueTest(3, 2);
}
} // namespace
} // namespace net
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