[SPDY] Replace SpdyIOBuffer with new SpdyBuffer class

net/spdy/spdy_read_queue_unittest.cc

+// 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