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/*
* Copyright 2015 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/buffer_queue.h"
#include <string.h>
#include "test/gtest.h"
namespace webrtc {
TEST(BufferQueueTest, TestAll) {
const size_t kSize = 16;
const char in[kSize * 2 + 1] = "0123456789ABCDEFGHIJKLMNOPQRSTUV";
char out[kSize * 2];
size_t bytes;
BufferQueue queue1(1, kSize);
BufferQueue queue2(2, kSize);
// The queue is initially empty.
EXPECT_EQ(0u, queue1.size());
EXPECT_FALSE(queue1.ReadFront(out, kSize, &bytes));
// A write should succeed.
EXPECT_TRUE(queue1.WriteBack(in, kSize, &bytes));
EXPECT_EQ(kSize, bytes);
EXPECT_EQ(1u, queue1.size());
// The queue is full now (only one buffer allowed).
EXPECT_FALSE(queue1.WriteBack(in, kSize, &bytes));
EXPECT_EQ(1u, queue1.size());
// Reading previously written buffer.
EXPECT_TRUE(queue1.ReadFront(out, kSize, &bytes));
EXPECT_EQ(kSize, bytes);
EXPECT_EQ(0, memcmp(in, out, kSize));
// The queue is empty again now.
EXPECT_FALSE(queue1.ReadFront(out, kSize, &bytes));
EXPECT_EQ(0u, queue1.size());
// Reading only returns available data.
EXPECT_TRUE(queue1.WriteBack(in, kSize, &bytes));
EXPECT_EQ(kSize, bytes);
EXPECT_EQ(1u, queue1.size());
EXPECT_TRUE(queue1.ReadFront(out, kSize * 2, &bytes));
EXPECT_EQ(kSize, bytes);
EXPECT_EQ(0, memcmp(in, out, kSize));
EXPECT_EQ(0u, queue1.size());
// Reading maintains buffer boundaries.
EXPECT_TRUE(queue2.WriteBack(in, kSize / 2, &bytes));
EXPECT_EQ(1u, queue2.size());
EXPECT_TRUE(queue2.WriteBack(in + kSize / 2, kSize / 2, &bytes));
EXPECT_EQ(2u, queue2.size());
EXPECT_TRUE(queue2.ReadFront(out, kSize, &bytes));
EXPECT_EQ(kSize / 2, bytes);
EXPECT_EQ(0, memcmp(in, out, kSize / 2));
EXPECT_EQ(1u, queue2.size());
EXPECT_TRUE(queue2.ReadFront(out, kSize, &bytes));
EXPECT_EQ(kSize / 2, bytes);
EXPECT_EQ(0, memcmp(in + kSize / 2, out, kSize / 2));
EXPECT_EQ(0u, queue2.size());
// Reading truncates buffers.
EXPECT_TRUE(queue2.WriteBack(in, kSize / 2, &bytes));
EXPECT_EQ(1u, queue2.size());
EXPECT_TRUE(queue2.WriteBack(in + kSize / 2, kSize / 2, &bytes));
EXPECT_EQ(2u, queue2.size());
// Read first packet partially in too-small buffer.
EXPECT_TRUE(queue2.ReadFront(out, kSize / 4, &bytes));
EXPECT_EQ(kSize / 4, bytes);
EXPECT_EQ(0, memcmp(in, out, kSize / 4));
EXPECT_EQ(1u, queue2.size());
// Remainder of first packet is truncated, reading starts with next packet.
EXPECT_TRUE(queue2.ReadFront(out, kSize, &bytes));
EXPECT_EQ(kSize / 2, bytes);
EXPECT_EQ(0, memcmp(in + kSize / 2, out, kSize / 2));
EXPECT_EQ(0u, queue2.size());
}
} // namespace webrtc
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