tests-checksum-ucrc16.c
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/*
* Copyright (C) 2016 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @{
*
* @file
* @author Martine Lenders <m.lenders@fu-berlin.de>
*/
#include <stdint.h>
#include "embUnit/embUnit.h"
#include "checksum/ucrc16.h"
#include "tests-checksum.h"
#define CRC16_CCITT_SEED (0x1d0f)
/* equivalent to crc16-ccitt version */
static int calc_and_compare_crc_be_with_update(const uint8_t *buf,
size_t len, size_t split, uint16_t expected)
{
uint16_t result = ucrc16_calc_be(buf, split, UCRC16_CCITT_POLY_BE,
CRC16_CCITT_SEED);
result = ucrc16_calc_be(buf + split, len - split, UCRC16_CCITT_POLY_BE,
result);
return result == expected;
}
static int calc_and_compare_crc_be(const uint8_t *buf, size_t len,
uint16_t expected)
{
uint16_t result = ucrc16_calc_be(buf, len, UCRC16_CCITT_POLY_BE,
CRC16_CCITT_SEED);
return result == expected;
}
static void test_checksum_ucrc16_be_sequence_empty(void)
{
uint8_t buf[] = "";
uint16_t expect = CRC16_CCITT_SEED;
TEST_ASSERT(calc_and_compare_crc_be(buf, sizeof(buf) - 1, expect));
TEST_ASSERT(calc_and_compare_crc_be_with_update(buf, sizeof(buf) - 1,
(sizeof(buf) - 1) / 2, expect));
}
static void test_checksum_ucrc16_be_sequence_1a(void)
{
uint8_t buf[] = "A";
uint16_t expect = 0x9479;
TEST_ASSERT(calc_and_compare_crc_be(buf, sizeof(buf) - 1, expect));
TEST_ASSERT(calc_and_compare_crc_be_with_update(buf, sizeof(buf) - 1,
(sizeof(buf) - 1) / 2, expect));
}
static void test_checksum_ucrc16_be_sequence_256a(void)
{
uint8_t buf[] = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
uint16_t expect = 0xE938;
TEST_ASSERT(calc_and_compare_crc_be(buf, sizeof(buf) - 1, expect));
TEST_ASSERT(calc_and_compare_crc_be_with_update(buf, sizeof(buf) - 1,
(sizeof(buf) - 1) / 2, expect));
}
static void test_checksum_ucrc16_be_sequence_1to9(void)
{
uint8_t buf[] = "123456789";
uint16_t expect = 0xE5CC;
TEST_ASSERT(calc_and_compare_crc_be(buf, sizeof(buf) - 1, expect));
TEST_ASSERT(calc_and_compare_crc_be_with_update(buf, sizeof(buf)
- 1, (sizeof(buf) - 1) / 2, expect));
}
static void test_checksum_ucrc16_be_sequence_4bytes(void)
{
uint8_t buf[] = { 0x12, 0x34, 0x56, 0x78 };
uint16_t expect = 0xBA3C;
TEST_ASSERT(calc_and_compare_crc_be(buf, sizeof(buf), expect));
TEST_ASSERT(calc_and_compare_crc_be_with_update(buf, sizeof(buf),
sizeof(buf) / 2, expect));
}
static void test_checksum_ucrc16_le_ieee802164_frame(void)
{
/* test data taken from first packet in
* https://wiki.wireshark.org/SampleCaptures?action=AttachFile&do=get&target=6LoWPAN.pcap.gz */
uint8_t buf[] = { 0x41, 0xcc, 0xa4, 0xff, 0xff, 0x8a, 0x18, 0x00,
0xff, 0xff, 0xda, 0x1c, 0x00, 0x88, 0x18, 0x00,
0xff, 0xff, 0xda, 0x1c, 0x00, 0x41, 0x60, 0x00,
0x00, 0x00, 0x00, 0x19, 0x11, 0x40, 0xfe, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1c,
0xda, 0xff, 0xff, 0x00, 0x18, 0x88, 0xfe, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1c,
0xda, 0xff, 0xff, 0x00, 0x18, 0x8a, 0x04, 0x01,
0xf0, 0xb1, 0x00, 0x19, 0xea, 0x8a, 0x48, 0x65,
0x6c, 0x6c, 0x6f, 0x20, 0x30, 0x30, 0x33, 0x20,
0x30, 0x78, 0x43, 0x35, 0x39, 0x41, 0x0a };
uint16_t expect = 0x31f9;
uint16_t result = ucrc16_calc_le(buf, sizeof(buf), UCRC16_CCITT_POLY_LE, 0);
TEST_ASSERT_EQUAL_INT(expect, result);
}
Test *tests_checksum_ucrc16_tests(void)
{
EMB_UNIT_TESTFIXTURES(fixtures) {
/* Reference values according to
* http://srecord.sourceforge.net/crc16-ccitt.html */
new_TestFixture(test_checksum_ucrc16_be_sequence_empty),
new_TestFixture(test_checksum_ucrc16_be_sequence_1a),
new_TestFixture(test_checksum_ucrc16_be_sequence_256a),
new_TestFixture(test_checksum_ucrc16_be_sequence_1to9),
new_TestFixture(test_checksum_ucrc16_be_sequence_4bytes),
new_TestFixture(test_checksum_ucrc16_le_ieee802164_frame),
};
EMB_UNIT_TESTCALLER(checksum_ucrc16_tests, NULL, NULL, fixtures);
return (Test *)&checksum_ucrc16_tests;
}