openvcdiff | 311c714 | 2008-08-26 19:29:25 +0000 | [diff] [blame] | 1 | // Copyright 2008 Google Inc. |
| 2 | // Author: Lincoln Smith |
| 3 | // |
| 4 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | // you may not use this file except in compliance with the License. |
| 6 | // You may obtain a copy of the License at |
| 7 | // |
| 8 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | // |
| 10 | // Unless required by applicable law or agreed to in writing, software |
| 11 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | // See the License for the specific language governing permissions and |
| 14 | // limitations under the License. |
| 15 | |
| 16 | #include <config.h> |
| 17 | #include "headerparser.h" |
openvcdiff | 28db807 | 2008-10-10 23:29:11 +0000 | [diff] [blame] | 18 | #include <stdlib.h> // rand, srand |
openvcdiff | 311c714 | 2008-08-26 19:29:25 +0000 | [diff] [blame] | 19 | #include <string> |
| 20 | #include <vector> |
| 21 | #include "testing.h" |
| 22 | #include "varint_bigendian.h" |
| 23 | |
| 24 | namespace open_vcdiff { |
| 25 | namespace { // anonymous |
| 26 | |
openvcdiff | 311c714 | 2008-08-26 19:29:25 +0000 | [diff] [blame] | 27 | using std::vector; |
| 28 | |
| 29 | class VCDiffHeaderParserTest : public testing::Test { |
| 30 | protected: |
openvcdiff | 28db807 | 2008-10-10 23:29:11 +0000 | [diff] [blame] | 31 | typedef std::string string; |
openvcdiff | 28db807 | 2008-10-10 23:29:11 +0000 | [diff] [blame] | 32 | |
openvcdiff | 311c714 | 2008-08-26 19:29:25 +0000 | [diff] [blame] | 33 | static const int kTestSize = 1024; |
| 34 | |
| 35 | VCDiffHeaderParserTest() : parser(NULL) { } |
| 36 | |
| 37 | virtual ~VCDiffHeaderParserTest() { |
| 38 | delete parser; |
| 39 | } |
| 40 | |
| 41 | virtual void SetUp() { |
| 42 | srand(1); // make sure each test uses the same data set |
| 43 | } |
| 44 | |
| 45 | void StartParsing() { |
| 46 | parser = new VCDiffHeaderParser( |
| 47 | encoded_buffer_.data(), |
| 48 | encoded_buffer_.data() + encoded_buffer_.size()); |
| 49 | EXPECT_EQ(encoded_buffer_.data(), parser->UnparsedData()); |
| 50 | } |
| 51 | |
| 52 | void VerifyByte(unsigned char expected_value) { |
| 53 | unsigned char decoded_byte = 0; |
| 54 | const char* prior_position = parser->UnparsedData(); |
| 55 | EXPECT_TRUE(parser->ParseByte(&decoded_byte)); |
| 56 | EXPECT_EQ(expected_value, decoded_byte); |
| 57 | EXPECT_EQ(RESULT_SUCCESS, parser->GetResult()); |
| 58 | EXPECT_EQ(prior_position + sizeof(unsigned char), |
| 59 | parser->UnparsedData()); |
| 60 | } |
| 61 | |
| 62 | void VerifyInt32(int32_t expected_value) { |
| 63 | int32_t decoded_integer = 0; |
| 64 | const char* prior_position = parser->UnparsedData(); |
| 65 | EXPECT_TRUE(parser->ParseInt32("decoded int32", &decoded_integer)); |
| 66 | EXPECT_EQ(expected_value, decoded_integer); |
| 67 | EXPECT_EQ(RESULT_SUCCESS, parser->GetResult()); |
| 68 | EXPECT_EQ(prior_position + VarintBE<int32_t>::Length(decoded_integer), |
| 69 | parser->UnparsedData()); |
| 70 | } |
| 71 | |
| 72 | void VerifyUInt32(uint32_t expected_value) { |
| 73 | uint32_t decoded_integer = 0; |
| 74 | const char* prior_position = parser->UnparsedData(); |
| 75 | EXPECT_TRUE(parser->ParseUInt32("decoded uint32", &decoded_integer)); |
| 76 | EXPECT_EQ(expected_value, decoded_integer); |
| 77 | EXPECT_EQ(RESULT_SUCCESS, parser->GetResult()); |
| 78 | EXPECT_EQ(prior_position + VarintBE<int64_t>::Length(decoded_integer), |
| 79 | parser->UnparsedData()); |
| 80 | } |
| 81 | |
| 82 | void VerifyChecksum(VCDChecksum expected_value) { |
| 83 | VCDChecksum decoded_checksum = 0; |
| 84 | const char* prior_position = parser->UnparsedData(); |
| 85 | EXPECT_TRUE(parser->ParseChecksum("decoded checksum", &decoded_checksum)); |
| 86 | EXPECT_EQ(expected_value, decoded_checksum); |
| 87 | EXPECT_EQ(RESULT_SUCCESS, parser->GetResult()); |
| 88 | EXPECT_EQ(prior_position + VarintBE<int64_t>::Length(decoded_checksum), |
| 89 | parser->UnparsedData()); |
| 90 | } |
| 91 | |
| 92 | string encoded_buffer_; |
| 93 | VCDiffHeaderParser* parser; |
| 94 | }; |
| 95 | |
| 96 | TEST_F(VCDiffHeaderParserTest, ParseRandomBytes) { |
| 97 | vector<unsigned char> byte_values; |
| 98 | for (int i = 0; i < kTestSize; ++i) { |
| 99 | unsigned char random_byte = PortableRandomInRange<unsigned char>(0xFF); |
| 100 | encoded_buffer_.push_back(random_byte); |
| 101 | byte_values.push_back(random_byte); |
| 102 | } |
| 103 | StartParsing(); |
| 104 | for (int position = 0; position < kTestSize; ++position) { |
| 105 | VerifyByte(byte_values[position]); |
| 106 | } |
| 107 | unsigned char decoded_byte = 0; |
| 108 | EXPECT_FALSE(parser->ParseByte(&decoded_byte)); |
| 109 | EXPECT_EQ(RESULT_END_OF_DATA, parser->GetResult()); |
| 110 | EXPECT_EQ(encoded_buffer_.data() + encoded_buffer_.size(), |
| 111 | parser->UnparsedData()); |
| 112 | } |
| 113 | |
| 114 | TEST_F(VCDiffHeaderParserTest, ParseRandomInt32) { |
| 115 | vector<int32_t> integer_values; |
| 116 | for (int i = 0; i < kTestSize; ++i) { |
| 117 | int32_t random_integer = PortableRandomInRange<int32_t>(0x7FFFFFFF); |
| 118 | VarintBE<int32_t>::AppendToString(random_integer, &encoded_buffer_); |
| 119 | integer_values.push_back(random_integer); |
| 120 | } |
| 121 | StartParsing(); |
| 122 | for (int i = 0; i < kTestSize; ++i) { |
| 123 | VerifyInt32(integer_values[i]); |
| 124 | } |
| 125 | int32_t decoded_integer = 0; |
| 126 | EXPECT_FALSE(parser->ParseInt32("decoded integer", &decoded_integer)); |
| 127 | EXPECT_EQ(RESULT_END_OF_DATA, parser->GetResult()); |
| 128 | EXPECT_EQ(encoded_buffer_.data() + encoded_buffer_.size(), |
| 129 | parser->UnparsedData()); |
| 130 | } |
| 131 | |
| 132 | TEST_F(VCDiffHeaderParserTest, ParseRandomUInt32) { |
| 133 | vector<uint32_t> integer_values; |
| 134 | for (int i = 0; i < kTestSize; ++i) { |
| 135 | uint32_t random_integer = PortableRandomInRange<uint32_t>(0xFFFFFFFF); |
| 136 | VarintBE<int64_t>::AppendToString(random_integer, &encoded_buffer_); |
| 137 | integer_values.push_back(random_integer); |
| 138 | } |
| 139 | StartParsing(); |
| 140 | uint32_t decoded_integer = 0; |
| 141 | for (int i = 0; i < kTestSize; ++i) { |
| 142 | VerifyUInt32(integer_values[i]); |
| 143 | } |
| 144 | EXPECT_FALSE(parser->ParseUInt32("decoded integer", &decoded_integer)); |
| 145 | EXPECT_EQ(RESULT_END_OF_DATA, parser->GetResult()); |
| 146 | EXPECT_EQ(encoded_buffer_.data() + encoded_buffer_.size(), |
| 147 | parser->UnparsedData()); |
| 148 | } |
| 149 | |
| 150 | TEST_F(VCDiffHeaderParserTest, ParseRandomChecksum) { |
| 151 | vector<VCDChecksum> checksum_values; |
| 152 | for (int i = 0; i < kTestSize; ++i) { |
| 153 | VCDChecksum random_checksum = |
| 154 | PortableRandomInRange<VCDChecksum>(0xFFFFFFFF); |
| 155 | VarintBE<int64_t>::AppendToString(random_checksum, &encoded_buffer_); |
| 156 | checksum_values.push_back(random_checksum); |
| 157 | } |
| 158 | StartParsing(); |
| 159 | for (int i = 0; i < kTestSize; ++i) { |
| 160 | VerifyChecksum(checksum_values[i]); |
| 161 | } |
| 162 | VCDChecksum decoded_checksum = 0; |
| 163 | EXPECT_FALSE(parser->ParseChecksum("decoded checksum", &decoded_checksum)); |
| 164 | EXPECT_EQ(RESULT_END_OF_DATA, parser->GetResult()); |
| 165 | EXPECT_EQ(encoded_buffer_.data() + encoded_buffer_.size(), |
| 166 | parser->UnparsedData()); |
| 167 | } |
| 168 | |
| 169 | TEST_F(VCDiffHeaderParserTest, ParseMixed) { |
| 170 | VarintBE<int64_t>::AppendToString(0xCAFECAFE, &encoded_buffer_); |
| 171 | encoded_buffer_.push_back(0xFF); |
| 172 | VarintBE<int32_t>::AppendToString(0x02020202, &encoded_buffer_); |
| 173 | VarintBE<int64_t>::AppendToString(0xCAFECAFE, &encoded_buffer_); |
| 174 | encoded_buffer_.push_back(0xFF); |
| 175 | encoded_buffer_.push_back(0xFF); |
| 176 | StartParsing(); |
| 177 | VerifyUInt32(0xCAFECAFE); |
| 178 | VerifyByte(0xFF); |
| 179 | VerifyInt32(0x02020202); |
| 180 | VerifyChecksum(0xCAFECAFE); |
| 181 | int32_t incomplete_int32 = 0; |
| 182 | EXPECT_FALSE(parser->ParseInt32("incomplete Varint", &incomplete_int32)); |
| 183 | EXPECT_EQ(0, incomplete_int32); |
| 184 | EXPECT_EQ(RESULT_END_OF_DATA, parser->GetResult()); |
| 185 | EXPECT_EQ(encoded_buffer_.data() + encoded_buffer_.size() - 2, |
| 186 | parser->UnparsedData()); |
| 187 | } |
| 188 | |
| 189 | TEST_F(VCDiffHeaderParserTest, ParseInvalidVarint) { |
| 190 | // Start with a byte that has the continuation bit plus a high-order bit set |
| 191 | encoded_buffer_.append(1, static_cast<char>(0xC0)); |
| 192 | // Add too many bytes with continuation bits |
| 193 | encoded_buffer_.append(6, static_cast<char>(0x80)); |
| 194 | StartParsing(); |
| 195 | int32_t invalid_int32 = 0; |
| 196 | EXPECT_FALSE(parser->ParseInt32("invalid Varint", &invalid_int32)); |
| 197 | EXPECT_EQ(0, invalid_int32); |
| 198 | EXPECT_EQ(RESULT_ERROR, parser->GetResult()); |
| 199 | EXPECT_EQ(encoded_buffer_.data(), parser->UnparsedData()); |
| 200 | // After the parse failure, any other call to Parse... should return an error, |
| 201 | // even though there is still a byte that could be read as valid. |
| 202 | unsigned char decoded_byte = 0; |
| 203 | EXPECT_FALSE(parser->ParseByte(&decoded_byte)); |
| 204 | EXPECT_EQ(0, decoded_byte); |
| 205 | EXPECT_EQ(RESULT_ERROR, parser->GetResult()); |
| 206 | EXPECT_EQ(encoded_buffer_.data(), parser->UnparsedData()); |
| 207 | } |
| 208 | |
| 209 | } // namespace open_vcdiff |
| 210 | } // anonymous namespace |