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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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