Implement WebSocketDeflater.

net/websockets/websocket_deflater_test.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/websockets/websocket_deflater.h"
+
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/io_buffer.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+
+TEST(WebSocketDeflaterTest, Construct) {
+  WebSocketDeflater deflater(8, WebSocketDeflater::TAKE_OVER_CONTEXT);
+  std::string expected("\x02\x00", 2);
+
+  scoped_refptr<IOBufferWithSize> actual = deflater.Finish();
+  ASSERT_TRUE(actual);
+  EXPECT_EQ(expected, std::string(actual->data(), actual->size()));

[Adam Rice, 2013/08/29 12:04:33]

My preference would be to construct the expected string inline here, ie.

EXPECT_EQ(std::string("\x02\x00", 2), ...)

It's a bit ugly because of the trailing \x00 but I think the diagnostics on
failure would be better.

[yhirano, 2013/08/30 06:20:35]

Done.

+}
+
+TEST(WebSocketDeflaterTest, DeflateHelloTakeOverContext) {
+  WebSocketDeflater deflater(15, WebSocketDeflater::TAKE_OVER_CONTEXT);
+  scoped_refptr<IOBufferWithSize> actual1, actual2;
+  std::string expected1("\xf2\x48\xcd\xc9\xc9\x07\x00", 7);
+  std::string expected2("\xf2\x00\x11\x00\x00", 5);
+
+  ASSERT_TRUE(deflater.AddBytes("Hello", strlen("Hello")));
+  actual1 = deflater.Finish();
+  ASSERT_TRUE(actual1);
+  EXPECT_EQ(expected1, std::string(actual1->data(), actual1->size()));
+
+  ASSERT_TRUE(deflater.AddBytes("Hello", strlen("Hello")));
+  actual2 = deflater.Finish();
+  ASSERT_TRUE(actual2);
+  EXPECT_EQ(expected2, std::string(actual2->data(), actual2->size()));
+}
+
+TEST(WebSocketDeflaterTest, DeflateHelloDoNotTakeOverContext) {
+  WebSocketDeflater deflater(15, WebSocketDeflater::DO_NOT_TAKE_OVER_CONTEXT);
+  scoped_refptr<IOBufferWithSize> actual1, actual2;
+  std::string expected1("\xf2\x48\xcd\xc9\xc9\x07\x00", 7);
+  std::string expected2("\xf2\x48\xcd\xc9\xc9\x07\x00", 7);
+
+  ASSERT_TRUE(deflater.AddBytes("Hello", strlen("Hello")));
+  actual1 = deflater.Finish();
+  ASSERT_TRUE(actual1);
+  EXPECT_EQ(expected1, std::string(actual1->data(), actual1->size()));
+
+  ASSERT_TRUE(deflater.AddBytes("Hello", strlen("Hello")));
+  actual2 = deflater.Finish();
+  ASSERT_TRUE(actual2);
+  EXPECT_EQ(expected2, std::string(actual2->data(), actual2->size()));
+}
+
+TEST(WebSocketDeflaterTest, MultipleAddBytesCalls) {
+  WebSocketDeflater deflater(15, WebSocketDeflater::DO_NOT_TAKE_OVER_CONTEXT);
+  std::vector<char> input(32, 'a');
+  scoped_refptr<IOBufferWithSize> actual;
+  std::string expected("\x4a\x4c\xc4\x0f\x00\x00", 6);
+
+  for (size_t i = 0; i < input.size(); ++i) {
+    ASSERT_TRUE(deflater.AddBytes(&input[i], 1));
+  }
+  actual = deflater.Finish();
+  ASSERT_TRUE(actual);
+  EXPECT_EQ(expected, std::string(actual->data(), actual->size()));
+}
+
+TEST(WebSocketDeflaterTest, WindowBits8And15) {

[Adam Rice, 2013/08/29 12:04:33]

If it was me I would split this into two tests,
"WindowBits8DoesNotMakeLongBackreference" and
"WindowBits15DoesMakeLongBackreferences". You could have a utility function to
construct the input buffer to avoid duplicating that code.

[yhirano, 2013/08/30 06:20:35]

Done.

+  WebSocketDeflater deflater8(8, WebSocketDeflater::DO_NOT_TAKE_OVER_CONTEXT);
+  WebSocketDeflater deflater15(15, WebSocketDeflater::DO_NOT_TAKE_OVER_CONTEXT);
+  std::vector<char> input(1024 + 64 * 2, 'a');
+  // Modify the head and tail of |input| so that back-reference
+  // can be used if the window size is sufficiently-large.
+  for (size_t j = 0; j < 64; ++j) {
+    input[j] = 'b';
+    input[input.size() - j - 1] = 'b';
+  }
+  scoped_refptr<IOBufferWithSize> actual8;
+  scoped_refptr<IOBufferWithSize> actual15;
+  std::string expected8("JJ\xa2\x0c$\x8e\x82Q0\nF,H\xa2\x10\x00\x00", 17);
+  std::string expected15("JJ\xa2\x0c$\x8e\x82Q0\nF,\xa0\xb0\xf8H\x02\x00", 18);
+
+  ASSERT_TRUE(deflater8.AddBytes(input.data(), input.size()));
+  ASSERT_TRUE(deflater15.AddBytes(input.data(), input.size()));
+  actual8 = deflater8.Finish();
+  actual15 = deflater15.Finish();
+  ASSERT_TRUE(actual8);
+  ASSERT_TRUE(actual15);
+  EXPECT_EQ(expected8, std::string(actual8->data(), actual8->size()));
+  EXPECT_EQ(expected15, std::string(actual15->data(), actual15->size()));
+}
+
+}  // namespace net