#include <stdio.h>
#include <stdint.h>
#include <string.h>

#include <gtest/gtest.h>

#include  <di/crc.h>

TEST(crc, crc16_ccitt) {
	uint8_t buf[257];
	uint16_t crc;

	memset(buf, 0, sizeof(buf));

	crc = di_crc16_ccitt(&buf, 0);
	EXPECT_EQ(0xFFFFU, crc);
	printf("crc: 0x%04x\n", crc);

	buf[0] = 'A';
	crc = di_crc16_ccitt(&buf, 1);
	EXPECT_EQ(0xB915, crc);
	printf("crc: 0x%04x\n", crc);

	snprintf(reinterpret_cast<char *>(buf), sizeof(buf), "123456789");
	crc = di_crc16_ccitt(&buf, strlen(reinterpret_cast<char *>(buf)));
	EXPECT_EQ(0x29B1U, crc);
	printf("crc: 0x%04x\n", crc);

	memset(buf, 'A', 256);
	crc = di_crc16_ccitt(&buf, strlen(reinterpret_cast<char *>(buf)));
	EXPECT_EQ(0xEA0B, crc);
	printf("crc: 0x%04x\n", crc);
}