crc_byte-test.c
1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 3 #include <tests/test.h> 4 #include <crc_byte.h> 5 6 static const uint8_t test_data_bytes[] = { 7 0x2f, 0x8f, 0x2d, 0x06, 0xc2, 0x11, 0x0c, 0xaf, 0xd7, 0x4b, 0x48, 0x71, 0xce, 0x3c, 8 0xfe, 0x29, 0x90, 0xf6, 0x33, 0x6d, 0x79, 0x23, 0x9d, 0x84, 0x58, 0x5c, 0xcc, 0xf1, 9 0xa1, 0xf2, 0x39, 0x22, 0xdc, 0x63, 0xe0, 0x44, 0x0a, 0x95, 0x36, 0xee, 0x53, 0xb3, 10 0x61, 0x2c, 0x4a, 0xf4, 0x8b, 0x32, 0xeb, 0x94, 0x86, 0x55, 0x41, 0x27, 0xa4, 0xbd, 11 0x0f, 0xc1, 0x4f, 0xfb, 0xb6, 0xa3, 0xc5, 0x38, 0x99, 0xfc, 0xca, 0xf8, 0x8e, 0x72, 12 0xaa, 0xed, 0x6b, 0xb2, 0xd3, 0xd4, 0xd6, 0x81, 0x7d, 0x24, 0x56, 0x9f, 0x7a, 0x21, 13 0x67, 0xac, 0x6a, 0x98, 0xf7, 0xd1, 0xad, 0x01, 0xdb, 0xc6, 0x80, 0x34, 0x8d, 0x51, 14 0x60, 0x3e, 0xd2, 0x52, 0x0e, 0x26, 0x12, 0xb1, 0x13, 0xa2, 0x88, 0x04, 0x66, 0xb0, 15 0x3b, 0xc8, 0x1b, 0x7f, 0x92, 0x4e, 0xb8, 0xe9, 0x70, 0xe3, 0xfa, 0x76, 0x3a, 0xa7, 16 0x4c, 0x25, 0x91, 0x54, 0x19, 0xea, 0x50, 0x37, 0xd8, 0xb4, 0x47, 0x49, 0xbf, 0xc4, 17 0xb7, 0xd0, 0x93, 0xda, 0x6c, 0x03, 0x9b, 0x15, 0xbb, 0xfd, 0xe7, 0xdd, 0x2e, 0x31, 18 0x68, 0x46, 0xa0, 0x43, 0xcd, 0x08, 0x8c, 0xff, 0x40, 0xcf, 0x1a, 0x7c, 0x69, 0x59, 19 0xc0, 0x5b, 0x83, 0x17, 0x10, 0x14, 0x9e, 0x1d, 0xc3, 0xa6, 0x5f, 0x4d, 0x9c, 0xa5, 20 0x73, 0x77, 0x87, 0x96, 0x65, 0x0b, 0xec, 0xc7, 0xd9, 0x85, 0x1c, 0xae, 0x18, 0x5e, 21 0x09, 0x78, 0x2b, 0x82, 0x1f, 0xe6, 0xc9, 0x64, 0x6f, 0x20, 0x16, 0x57, 0x9a, 0xbe, 22 0xd5, 0xe2, 0x89, 0x3f, 0xdf, 0xe4, 0x7e, 0xde, 0x30, 0xa9, 0x74, 0xe5, 0xab, 0x07, 23 0x35, 0x5d, 0x2a, 0x28, 0xcb, 0xf0, 0x8a, 0xef, 0x5a, 0xe1, 0x75, 0x42, 0xf9, 0xba, 24 0x02, 0xbc, 0xf5, 0x45, 0x05, 0x0d, 0x3d, 0x62, 0xb9, 0x00, 0x7b, 0x1e, 0xe8, 0xb5, 25 0x97, 0x6e, 0xa8, 0xf3, 26 }; 27 static const size_t test_data_bytes_sz = ARRAY_SIZE(test_data_bytes); 28 static const uint8_t test_data_crc7_checksum = 0x30; 29 static const uint16_t test_data_crc16_checksum = 0x1263; 30 static const uint32_t test_data_crc32_checksum = 0xc7f52a93; 31 32 static void test_crc7_byte_zeros(void **state) 33 { 34 uint8_t crc_value = 0u; 35 36 /* Expect zero as crc value after calculating it for single zero byte */ 37 crc_value = crc7_byte(crc_value, 0); 38 assert_int_equal(0, crc_value); 39 40 /* Expect zero crc for zero-byte stream */ 41 for (size_t i = 0; i < 3000; ++i) { 42 crc_value = crc7_byte(crc_value, 0); 43 assert_int_equal(0, crc_value); 44 } 45 } 46 47 static void test_crc7_byte_same_byte_twice_different_value(void **state) 48 { 49 uint8_t crc_value = 0u; 50 51 /* Expect value to change after feeding crc function with the same byte twice. */ 52 crc_value = crc7_byte(crc_value, 0xAD); 53 assert_int_equal(0x2C, crc_value); 54 55 crc_value = crc7_byte(crc_value, 0xAD); 56 assert_int_equal(0x90, crc_value); 57 } 58 59 static void test_crc7_byte_repeat_stream(void **state) 60 { 61 uint8_t crc_value_1 = 0u; 62 uint8_t crc_value_2 = 0u; 63 const size_t iterations = 25600; 64 65 /* Calculate CRC7 twice for the same data and expect the same result. 66 Ensure deterministic and repeatable behavior. */ 67 for (size_t i = 0; i < iterations; i++) { 68 const uint8_t value = (i & 0xFF) ^ ((i >> 8) & 0xFF); 69 crc_value_1 = crc7_byte(crc_value_1, value); 70 } 71 72 for (size_t i = 0; i < iterations; i++) { 73 const uint8_t value = (i & 0xFF) ^ ((i >> 8) & 0xFF); 74 crc_value_2 = crc7_byte(crc_value_2, value); 75 } 76 77 assert_int_equal(crc_value_1, crc_value_2); 78 } 79 80 static void test_crc7_byte_single_bit_difference(void **state) 81 { 82 uint8_t crc_value_1 = 0u; 83 uint8_t crc_value_2 = 0u; 84 85 for (size_t i = 0; i < 1000; ++i) { 86 crc_value_1 = crc7_byte(crc_value_1, (i % 128) << 1); 87 crc_value_2 = crc7_byte(crc_value_2, (i % 128) << 1); 88 } 89 crc_value_1 = crc7_byte(crc_value_1, 0xF0); 90 crc_value_2 = crc7_byte(crc_value_2, 0xF1); 91 92 /* Expect different CRC values for byte streams differing by one bit. */ 93 assert_int_not_equal(crc_value_1, crc_value_2); 94 } 95 96 /* This test uses CRC() macro to check if it works correctly with provided crc function */ 97 static void test_crc7_byte_static_data(void **state) 98 { 99 uint8_t crc_value = CRC(test_data_bytes, test_data_bytes_sz, crc7_byte); 100 101 assert_int_equal(test_data_crc7_checksum, crc_value); 102 103 /* Calculating CRC of data with its CRC should yield zero if data 104 and/or checksum is correct */ 105 assert_int_equal(0, crc7_byte(crc_value, test_data_crc7_checksum)); 106 } 107 108 static void test_crc16_byte_zeros(void **state) 109 { 110 uint16_t crc_value = 0u; 111 112 /* Expect zero as crc value after calculating it for single zero byte */ 113 crc_value = crc16_byte(crc_value, 0); 114 assert_int_equal(0, crc_value); 115 116 /* Expect zero crc for zero-byte stream */ 117 for (size_t i = 0; i < 3000; ++i) { 118 crc_value = crc16_byte(crc_value, 0); 119 assert_int_equal(0, crc_value); 120 } 121 } 122 123 static void test_crc16_same_data_twice_different_value(void **state) 124 { 125 uint16_t crc_value = 0u; 126 127 /* Expect value to change after feeding crc function with the same byte twice. */ 128 crc_value = crc16_byte(crc_value, 0xDF); 129 assert_int_equal(0x3a92, crc_value); 130 131 crc_value = crc16_byte(crc_value, 0xDF); 132 assert_int_equal(0x3f8b, crc_value); 133 } 134 135 static void test_crc16_byte_repeat_stream(void **state) 136 { 137 uint16_t crc_value_1 = 0u; 138 uint16_t crc_value_2 = 0u; 139 const size_t iterations = 17777; 140 141 /* Calculate CRC16 twice for the same data and expect the same result. 142 Ensure deterministic and repeatable behavior. */ 143 for (size_t i = 0; i < iterations; i++) { 144 const uint8_t value = (i & 0xFF) ^ ((i >> 8) & 0xFF); 145 crc_value_1 = crc16_byte(crc_value_1, value); 146 } 147 148 for (size_t i = 0; i < iterations; i++) { 149 const uint8_t value = (i & 0xFF) ^ ((i >> 8) & 0xFF); 150 crc_value_2 = crc16_byte(crc_value_2, value); 151 } 152 153 assert_int_equal(crc_value_1, crc_value_2); 154 } 155 156 static void test_crc16_byte_single_bit_difference(void **state) 157 { 158 uint16_t crc_value_1 = 0u; 159 uint16_t crc_value_2 = 0u; 160 161 for (size_t i = 0; i < 2000; ++i) { 162 crc_value_1 = crc16_byte(crc_value_1, (i % 128) << 1); 163 crc_value_2 = crc16_byte(crc_value_2, (i % 128) << 1); 164 } 165 crc_value_1 = crc16_byte(crc_value_1, 0x1A); 166 crc_value_2 = crc16_byte(crc_value_2, 0x0A); 167 168 /* Expect different CRC values for byte streams differing by one bit. */ 169 assert_int_not_equal(crc_value_1, crc_value_2); 170 } 171 172 /* This test uses CRC() macro to check if it works correctly with provided crc function */ 173 static void test_crc16_byte_static_data(void **state) 174 { 175 uint16_t crc_value = CRC(test_data_bytes, test_data_bytes_sz, crc16_byte); 176 177 assert_int_equal(test_data_crc16_checksum, crc_value); 178 179 /* Calculating CRC of data with its CRC should yield zero if data 180 and/or checksum is correct */ 181 assert_int_equal(0, crc16_byte(crc16_byte(crc_value, test_data_crc16_checksum >> 8), 182 test_data_crc16_checksum & 0xFF)); 183 } 184 185 static void test_crc32_byte_zeros(void **state) 186 { 187 uint32_t crc_value = 0u; 188 189 /* Expect zero as crc value after calculating it for single zero byte */ 190 crc_value = crc32_byte(crc_value, 0); 191 assert_int_equal(0, crc_value); 192 193 /* Expect zero crc for zero-byte stream */ 194 for (size_t i = 0; i < 1553; ++i) { 195 crc_value = crc32_byte(crc_value, 0); 196 assert_int_equal(0, crc_value); 197 } 198 } 199 200 static void test_crc32_same_data_twice_different_value(void **state) 201 { 202 uint32_t crc_value = 0u; 203 204 /* Expect value to change after feeding crc function with the same byte twice. */ 205 crc_value = crc32_byte(crc_value, 0xDF); 206 assert_int_equal(0x29d4f654, crc_value); 207 208 crc_value = crc32_byte(crc_value, 0xDF); 209 assert_int_equal(0x47c8e4bb, crc_value); 210 } 211 212 static void test_crc32_byte_repeat_stream(void **state) 213 { 214 uint32_t crc_value_1 = 0u; 215 uint32_t crc_value_2 = 0u; 216 const size_t iterations = 8935; 217 218 /* Calculate CRC16 twice for the same data and expect the same result. 219 Ensure deterministic and repeatable behavior. */ 220 for (size_t i = 0; i < iterations; i++) { 221 const uint8_t value = (i & 0xFF) ^ ((i >> 8) & 0xFF); 222 crc_value_1 = crc32_byte(crc_value_1, value); 223 } 224 225 for (size_t i = 0; i < iterations; i++) { 226 const uint8_t value = (i & 0xFF) ^ ((i >> 8) & 0xFF); 227 crc_value_2 = crc32_byte(crc_value_2, value); 228 } 229 230 assert_int_equal(crc_value_1, crc_value_2); 231 } 232 233 static void test_crc32_byte_single_bit_difference(void **state) 234 { 235 uint32_t crc_value_1 = 0u; 236 uint32_t crc_value_2 = 0u; 237 238 for (size_t i = 0; i < 1338; ++i) { 239 crc_value_1 = crc32_byte(crc_value_1, (i % 128) << 1); 240 crc_value_2 = crc32_byte(crc_value_2, (i % 128) << 1); 241 } 242 crc_value_1 = crc32_byte(crc_value_1, 0x33); 243 crc_value_2 = crc32_byte(crc_value_2, 0x32); 244 245 /* Expect different CRC values for byte streams differing by one bit. */ 246 assert_int_not_equal(crc_value_1, crc_value_2); 247 } 248 249 /* This test uses CRC() macro to check if it works correctly with provided crc function */ 250 static void test_crc32_byte_static_data(void **state) 251 { 252 uint32_t crc_value = CRC(test_data_bytes, test_data_bytes_sz, crc32_byte); 253 254 assert_int_equal(test_data_crc32_checksum, crc_value); 255 256 /* Calculating CRC of data with its CRC should yield zero if data 257 and/or checksum is correct */ 258 for (int i = 3; i >= 0; --i) 259 crc_value = crc32_byte(crc_value, (test_data_crc32_checksum >> 8 * i) & 0xFF); 260 assert_int_equal(0, crc_value); 261 } 262 263 int main(void) 264 { 265 const struct CMUnitTest tests[] = { 266 cmocka_unit_test(test_crc7_byte_zeros), 267 cmocka_unit_test(test_crc7_byte_same_byte_twice_different_value), 268 cmocka_unit_test(test_crc7_byte_repeat_stream), 269 cmocka_unit_test(test_crc7_byte_single_bit_difference), 270 cmocka_unit_test(test_crc7_byte_static_data), 271 272 cmocka_unit_test(test_crc16_byte_zeros), 273 cmocka_unit_test(test_crc16_same_data_twice_different_value), 274 cmocka_unit_test(test_crc16_byte_repeat_stream), 275 cmocka_unit_test(test_crc16_byte_single_bit_difference), 276 cmocka_unit_test(test_crc16_byte_static_data), 277 278 cmocka_unit_test(test_crc32_byte_zeros), 279 cmocka_unit_test(test_crc32_same_data_twice_different_value), 280 cmocka_unit_test(test_crc32_byte_repeat_stream), 281 cmocka_unit_test(test_crc32_byte_single_bit_difference), 282 cmocka_unit_test(test_crc32_byte_static_data), 283 }; 284 285 return cb_run_group_tests(tests, NULL, NULL); 286 }