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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "chrome/browser/net/bit_stream_reader.h" | |
6 | |
7 #include <algorithm> | |
8 #include <string> | |
9 | |
10 #include "testing/gtest/include/gtest/gtest.h" | |
11 | |
12 namespace internal { | |
13 | |
14 const uint8_t kSomeData[] = {0xd5, 0xe2, 0xaf, 0xe5, 0xbb, 0x10, 0x7c, 0xd1}; | |
15 | |
16 TEST(BitStreamReaderTest, CanReadSingleByte) { | |
17 BitStreamReader reader( | |
18 base::StringPiece(reinterpret_cast<const char*>(kSomeData), 1)); | |
19 uint64_t v(0); | |
20 | |
21 EXPECT_EQ(8u, reader.BitsLeft()); | |
22 EXPECT_TRUE(reader.ReadBits(8, &v)); | |
23 EXPECT_EQ(UINT64_C(0xd5), v); | |
24 | |
25 EXPECT_FALSE(reader.ReadBits(1, &v)); | |
26 EXPECT_EQ(0u, reader.BitsLeft()); | |
27 } | |
28 | |
29 TEST(BitStreamReaderTest, CanReadSingleBits) { | |
30 const uint64_t expected_bits[] = { | |
31 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0}; | |
32 BitStreamReader reader( | |
33 base::StringPiece(reinterpret_cast<const char*>(kSomeData), 2)); | |
34 EXPECT_EQ(16u, reader.BitsLeft()); | |
35 uint64_t v(0); | |
36 | |
37 for (int i = 0; i < 16; ++i) { | |
38 EXPECT_TRUE(reader.ReadBits(1, &v)); | |
39 EXPECT_EQ(expected_bits[i], v); | |
40 } | |
41 EXPECT_EQ(0u, reader.BitsLeft()); | |
42 } | |
43 | |
44 TEST(BitStreamReaderTest, CanReadBitGroups) { | |
45 BitStreamReader reader( | |
46 base::StringPiece(reinterpret_cast<const char*>(kSomeData), 3)); | |
47 EXPECT_EQ(24u, reader.BitsLeft()); | |
48 uint64_t v(0); | |
49 uint64_t res(0); | |
50 | |
51 EXPECT_TRUE(reader.ReadBits(5, &v)); | |
52 res |= v << 19; | |
53 EXPECT_EQ(19u, reader.BitsLeft()); | |
54 EXPECT_TRUE(reader.ReadBits(13, &v)); | |
55 res |= v << 6; | |
56 EXPECT_EQ(6u, reader.BitsLeft()); | |
57 EXPECT_TRUE(reader.ReadBits(6, &v)); | |
58 res |= v; | |
59 EXPECT_EQ(UINT64_C(0xd5e2af), res); | |
60 | |
61 EXPECT_FALSE(reader.ReadBits(1, &v)); | |
62 } | |
63 | |
64 TEST(BitStreamReaderTest, CanRead64Bit) { | |
65 BitStreamReader reader( | |
66 base::StringPiece(reinterpret_cast<const char*>(kSomeData), 8)); | |
67 EXPECT_EQ(64u, reader.BitsLeft()); | |
68 uint64_t v(0); | |
69 | |
70 EXPECT_TRUE(reader.ReadBits(64, &v)); | |
71 EXPECT_EQ(UINT64_C(0xd5e2afe5bb107cd1), v); | |
72 } | |
73 | |
74 TEST(BitStreamReaderTest, CanReadUnaryEncodedNumbers) { | |
75 internal::BitStreamReader reader( | |
76 base::StringPiece(reinterpret_cast<const char*>(kSomeData), 3)); | |
77 const uint64_t expected_values[] = {2, 1, 1, 4, 0, 0, 1, 1, 1, 4}; | |
78 uint64_t v(0); | |
79 for (int i = 0; i < 10; ++i) { | |
80 EXPECT_TRUE(reader.ReadUnaryEncoding(&v)); | |
81 EXPECT_EQ(expected_values[i], v) << "Values differ at position " << i; | |
82 } | |
83 } | |
84 | |
85 TEST(BitStreamReaderTest, CannotReadFromEmptyStream) { | |
86 BitStreamReader reader(base::StringPiece( | |
87 reinterpret_cast<const char*>(kSomeData), static_cast<size_t>(0u))); | |
88 uint64_t v(0); | |
89 | |
90 EXPECT_EQ(0u, reader.BitsLeft()); | |
91 EXPECT_FALSE(reader.ReadBits(1, &v)); | |
92 EXPECT_FALSE(reader.ReadUnaryEncoding(&v)); | |
93 } | |
94 | |
95 } // namespace internal | |
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