[SPDY] Replace SpdyIOBuffer with new SpdyBuffer class

net/spdy/spdy_buffer_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_buffer.h"
+
+#include <cstddef>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/io_buffer.h"
+#include "net/spdy/spdy_protocol.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+
+namespace {
+
+const char kData[] = "hello!\0hi.";
+const size_t kDataSize = arraysize(kData);
+
+class SpdyBufferTest : public ::testing::Test {};
+
+// Make a string from the data remaining in |buffer|.
+std::string BufferToString(const SpdyBuffer& buffer) {
+  return std::string(buffer.GetRemainingData(), buffer.GetRemainingSize());
+}
+
+// Construct a SpdyBuffer from a SpdyFrame and make sure its data
+// points to the frame's underlying data.
+TEST_F(SpdyBufferTest, FrameConstructor) {
+  SpdyBuffer buffer(
+      scoped_ptr<SpdyFrame>(
+          new SpdyFrame(const_cast<char*>(kData), kDataSize,
+                        false /* owns_buffer */)));
+
+  EXPECT_EQ(kData, buffer.GetRemainingData());
+  EXPECT_EQ(kDataSize, buffer.GetRemainingSize());
+}
+
+// Construct a SpdyBuffer from a const char*/size_t pair and make sure
+// it makes a copy of the data.
+TEST_F(SpdyBufferTest, DataConstructor) {
+  std::string data(kData, kDataSize);
+  SpdyBuffer buffer(data.data(), data.size());
+  // This mutation shouldn't affect |buffer|'s data.
+  data[0] = 'H';
+
+  EXPECT_NE(kData, buffer.GetRemainingData());
+  EXPECT_EQ(kDataSize, buffer.GetRemainingSize());
+  EXPECT_EQ(std::string(kData, kDataSize), BufferToString(buffer));
+}
+
+// Construct a SpdyBuffer and call Consume() on it, which should
+// update the remaining data pointer and size appropriately.
+TEST_F(SpdyBufferTest, Consume) {
+  SpdyBuffer buffer(kData, kDataSize);
+
+  EXPECT_EQ(std::string(kData, kDataSize), BufferToString(buffer));
+
+  buffer.Consume(5);
+  EXPECT_EQ(std::string(kData + 5, kDataSize - 5), BufferToString(buffer));
+
+  buffer.Consume(kDataSize - 5);
+  EXPECT_EQ(0u, buffer.GetRemainingSize());
+}
+
+// Make sure the IOBuffer returned by GetIOBufferForRemainingData()
+// points to the buffer's remaining data and isn't updated by
+// Consume().
+TEST_F(SpdyBufferTest, GetIOBufferForRemainingData) {
+  SpdyBuffer buffer(kData, kDataSize);
+
+  buffer.Consume(5);
+  scoped_refptr<IOBuffer> io_buffer = buffer.GetIOBufferForRemainingData();
+  size_t io_buffer_size = buffer.GetRemainingSize();
+  const std::string expectedData(kData + 5, kDataSize - 5);
+  EXPECT_EQ(expectedData, std::string(io_buffer->data(), io_buffer_size));
+
+  buffer.Consume(kDataSize - 5);
+  EXPECT_EQ(expectedData, std::string(io_buffer->data(), io_buffer_size));
+}
+
+}  // namespace
+
+}  // namespace net