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97 lines
3.0 KiB
C
97 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/fletcher32.h"
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#include "tests-checksum.h"
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/* String is longer than 359 so it checks the wrap-around property of
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* fletcher32 */
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static const unsigned char wrap_around_data[] =
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"AD3Awn4kb6FtcsyE0RU25U7f55Yncn3LP3oEx9Gl4qr7iDW7I8L6Pbw9jNnh0sE4DmCKuc"
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"d1J8I34vn31W924y5GMS74vUrZQc08805aj4Tf66HgL1cO94os10V2s2GDQ825yNh9Yuq3"
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"QHcA60xl31rdA7WskVtCXI7ruH1A4qaR6Uk454hm401lLmv2cGWt5KTJmr93d3JsGaRRPs"
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"4HqYi4mFGowo8fWv48IcA3N89Z99nf0A0H2R6P0uI4Tir682Of3Rk78DUB2dIGQRRpdqVT"
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"tLhgfET2gUGU65V3edSwADMqRttI9JPVz8JS37g5QZj4Ax56rU1u0m0K8YUs57UYG5645n"
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"byNy4yqxu7";
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static int calc_and_compare_checksum(const unsigned char *buf, size_t len,
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uint32_t expected)
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{
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const uint16_t *buf16 = (const uint16_t *) buf;
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size_t len16 = len/2;
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uint32_t result = fletcher32(buf16, len16);
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return result == expected;
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}
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static void test_checksum_fletcher32_empty(void)
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{
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/* the initial checksum value is 0xFFFFFFFF */
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unsigned char buf[] = "";
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uint32_t expect = 0xFFFFFFFF;
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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_fletcher32_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 = fletcher32((const uint16_t *) buf0, sizeof(buf0)/2);
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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_fletcher32_atof(void)
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{
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/* XXX: not verified with external implementation yet */
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unsigned char buf[] = "abcdef";
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uint32_t expect = 0x56502d2a;
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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_fletcher32_wrap_around(void)
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{
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/* XXX: not verified with external implementation yet */
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uint32_t expect = 0x5bac8c3d;
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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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Test *tests_checksum_fletcher32_tests(void)
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{
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EMB_UNIT_TESTFIXTURES(fixtures) {
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new_TestFixture(test_checksum_fletcher32_empty),
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new_TestFixture(test_checksum_fletcher32_0to1_undetected),
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new_TestFixture(test_checksum_fletcher32_atof),
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new_TestFixture(test_checksum_fletcher32_wrap_around),
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};
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EMB_UNIT_TESTCALLER(checksum_fletcher32_tests, NULL, NULL, fixtures);
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return (Test *)&checksum_fletcher32_tests;
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}
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