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102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/*
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* Copyright 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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#include <stdint.h>
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#include "embUnit/embUnit.h"
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#include "checksum/fletcher16.h"
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#include "tests-checksum.h"
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/* String is longer than 20 so it checks the wrap-around property of
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* fletcher16 */
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static const unsigned char wrap_around_data[] = "u9k89rm88z58f3hGxTfgG3BnyKnyRP";
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static int calc_and_compare_checksum(const unsigned char *buf, size_t len,
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uint16_t expected)
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{
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uint16_t result = fletcher16(buf, len);
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return result == expected;
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}
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static void test_checksum_fletcher16_empty(void)
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{
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unsigned char buf[] = "";
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uint16_t expect = 0xFFFF;
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TEST_ASSERT(calc_and_compare_checksum(buf, sizeof(buf) - 1, expect));
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}
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static void test_checksum_fletcher16_0to1_undetected(void)
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{
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/* fletcher cannot distinguish between all 0 and all 1 segments */
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unsigned char buf0[16] = {
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0xA1, 0xA1, 0xA1, 0xA1,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x1A, 0x1A, 0x1A, 0x1A,
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};
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uint32_t expect = fletcher16(buf0, sizeof(buf0));
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unsigned char buf1[16] = {
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0xA1, 0xA1, 0xA1, 0xA1,
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0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF,
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0x1A, 0x1A, 0x1A, 0x1A,
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};
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TEST_ASSERT(calc_and_compare_checksum(buf1, sizeof(buf1), expect));
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}
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static void test_checksum_fletcher16_atoe(void)
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{
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/* verified with http://www.nitrxgen.net/hashgen/ */
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unsigned char buf[] = "abcde";
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uint16_t expect = 0xc8f0;
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TEST_ASSERT(calc_and_compare_checksum(buf, sizeof(buf) - 1, expect));
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}
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static void test_checksum_fletcher16_wrap_around(void)
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{
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/* verified with http://www.nitrxgen.net/hashgen/ */
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uint16_t expect = 0xf122;
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TEST_ASSERT(calc_and_compare_checksum(wrap_around_data,
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sizeof(wrap_around_data) - 1, expect));
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}
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static void test_checksum_fletcher16_multipart(void)
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{
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static const uint16_t expect = 0xf122;
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static const size_t half_len = sizeof(wrap_around_data)/2;
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fletcher16_ctx_t ctx;
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fletcher16_init(&ctx);
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fletcher16_update(&ctx, wrap_around_data, half_len);
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fletcher16_update(&ctx, wrap_around_data + half_len,
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sizeof(wrap_around_data) - half_len - 1);
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TEST_ASSERT_EQUAL_INT(expect, fletcher16_finish(&ctx));
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}
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Test *tests_checksum_fletcher16_tests(void)
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{
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EMB_UNIT_TESTFIXTURES(fixtures) {
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new_TestFixture(test_checksum_fletcher16_empty),
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new_TestFixture(test_checksum_fletcher16_0to1_undetected),
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new_TestFixture(test_checksum_fletcher16_atoe),
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new_TestFixture(test_checksum_fletcher16_wrap_around),
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new_TestFixture(test_checksum_fletcher16_multipart),
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};
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EMB_UNIT_TESTCALLER(checksum_fletcher16_tests, NULL, NULL, fixtures);
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return (Test *)&checksum_fletcher16_tests;
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}
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