/**
 * @file tests/can_crc.cpp
 * @brief CAN packet CRC tests
 * @date Oct 20, 2015
 * @author jjacobs
 * @copyright 2015 Dual Inventive Technology Centre B.V.
 *
 * CAN packet CRC tests
 */
#include <di/can/crc.h>
#include <di/can/msg.h>

#include <gtest/gtest.h>

/**
 * Calculate CRC on 1 byte payload.
 */
TEST(can_crc, calc_mft_payload_1_byte) {
	struct di_can_msg msg;
	uint16_t crc;
	uint8_t data[] = {
		0x55,
	};

	msg.size = sizeof(data);
	msg.msg  = data;
	EXPECT_EQ(DNOK, di_can_crc_calc(&msg, &crc));
	EXPECT_EQ(0xeba0, crc);
}

/**
 * Calculate CRC on 1 byte payload.
 */
TEST(can_crc, check_mft_payload_1_byte) {
	struct di_can_msg msg;
	uint16_t crc = 0xeba0;
	uint8_t data[] = {
		0x55,
	};

	msg.size = sizeof(data);
	msg.msg  = data;
	EXPECT_EQ(DNOK, di_can_crc_check(&msg, crc));
}

/**
 * Check if the di_can_crc_is_msg_valid
 */
TEST(can_crc, is_msg_valid) {
	struct di_can_msg msg;
	struct di_buffer buf;

	uint8_t data[] = {
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // SFT Source/Dest NodeID
		0x00, 0x00, 0x01, 0xeb, 0xa0, 0x00, 0x00, 0x00, // MFT-meta ptype,psize,pcrc (3 bytes zero fill, unused)
		0x55
	};

	buf.data = data;
	buf.size = sizeof(data);

	msg.size = sizeof(data);
	msg.msg  = data;
	msg.buf  = &buf;

	EXPECT_TRUE(di_can_crc_is_msg_valid(&msg));
	EXPECT_EQ(1U, msg.size);
	EXPECT_EQ(&data[DI_CAN_MSG_DATA_PAYLOAD_OFFSET], msg.msg);
	EXPECT_EQ(0x55, *msg.msg);
}