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
test_crc7_byte_zeros(void ** state)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
test_crc7_byte_same_byte_twice_different_value(void ** state)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
test_crc7_byte_repeat_stream(void ** state)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
test_crc7_byte_single_bit_difference(void ** state)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 */
test_crc7_byte_static_data(void ** state)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
test_crc16_byte_zeros(void ** state)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
test_crc16_same_data_twice_different_value(void ** state)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
test_crc16_byte_repeat_stream(void ** state)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
test_crc16_byte_single_bit_difference(void ** state)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 */
test_crc16_byte_static_data(void ** state)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
test_crc32_byte_zeros(void ** state)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
test_crc32_same_data_twice_different_value(void ** state)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
test_crc32_byte_repeat_stream(void ** state)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
test_crc32_byte_single_bit_difference(void ** state)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 */
test_crc32_byte_static_data(void ** state)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
main(void)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 }
287