Split the bit reader functionalities from the byte stream provider.

media/base/bit_reader_unittest.cc

 // Copyright (c) 2012 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 "media/base/bit_reader.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
@@ skipping 46 matching lines @@
   EXPECT_TRUE(reader1.ReadBits(8, &value8));
   EXPECT_EQ(value8, 3);
   EXPECT_TRUE(reader1.SkipBits(76));
   EXPECT_TRUE(reader1.ReadBits(4, &value8));
   EXPECT_EQ(value8, 13);
   EXPECT_FALSE(reader1.SkipBits(100));
   EXPECT_TRUE(reader1.SkipBits(0));
   EXPECT_FALSE(reader1.SkipBits(1));
 }
 
+TEST(BitReaderTest, BitsReadTest) {
+  int value;
+  bool flag;
+  uint8 buffer[] = { 0x0a, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
+  BitReader reader1(buffer, sizeof(buffer));
+  EXPECT_EQ(reader1.bits_available(), 120);
+
+  EXPECT_TRUE(reader1.SkipBits(2));
+  EXPECT_EQ(reader1.bits_read(), 2);
+  EXPECT_EQ(reader1.bits_available(), 118);
+  EXPECT_TRUE(reader1.ReadBits(3, &value));
+  EXPECT_EQ(reader1.bits_read(), 5);
+  EXPECT_EQ(reader1.bits_available(), 115);
+  EXPECT_TRUE(reader1.ReadFlag(&flag));
+  EXPECT_EQ(reader1.bits_read(), 6);
+  EXPECT_EQ(reader1.bits_available(), 114);
+  EXPECT_TRUE(reader1.SkipBits(76));
+  EXPECT_EQ(reader1.bits_read(), 82);
+  EXPECT_EQ(reader1.bits_available(), 38);
+}
+
 }  // namespace media