22 static uint16_t modem_ppp_fcs_init(uint8_t byte)  in modem_ppp_fcs_init()  argument
24 	return crc16_ccitt(0xFFFF, &byte, 1);  in modem_ppp_fcs_init()
27 static uint16_t modem_ppp_fcs_update(uint16_t fcs, uint8_t byte)  in modem_ppp_fcs_update()  argument
29 	return crc16_ccitt(fcs, &byte, 1);  in modem_ppp_fcs_update()
53 	uint8_t byte;  in modem_ppp_wrap_net_pkt_byte()  local
88 		byte = (ppp->tx_pkt_protocol >> 8) & 0xFF;  in modem_ppp_wrap_net_pkt_byte()
89 		ppp->tx_pkt_fcs = modem_ppp_fcs_update(ppp->tx_pkt_fcs, byte);  in modem_ppp_wrap_net_pkt_byte()
91 		if ((byte == MODEM_PPP_CODE_DELIMITER) || (byte == MODEM_PPP_CODE_ESCAPE) ||  in modem_ppp_wrap_net_pkt_byte()
92 		    (byte < MODEM_PPP_VALUE_ESCAPE)) {  in modem_ppp_wrap_net_pkt_byte()
93 			ppp->tx_pkt_escaped = byte ^ MODEM_PPP_VALUE_ESCAPE;  in modem_ppp_wrap_net_pkt_byte()
99 		return byte;  in modem_ppp_wrap_net_pkt_byte()
106 		byte = ppp->tx_pkt_protocol & 0xFF;  in modem_ppp_wrap_net_pkt_byte()
107 		ppp->tx_pkt_fcs = modem_ppp_fcs_update(ppp->tx_pkt_fcs, byte);  in modem_ppp_wrap_net_pkt_byte()
109 		if ((byte == MODEM_PPP_CODE_DELIMITER) || (byte == MODEM_PPP_CODE_ESCAPE) ||  in modem_ppp_wrap_net_pkt_byte()
110 		    (byte < MODEM_PPP_VALUE_ESCAPE)) {  in modem_ppp_wrap_net_pkt_byte()
111 			ppp->tx_pkt_escaped = byte ^ MODEM_PPP_VALUE_ESCAPE;  in modem_ppp_wrap_net_pkt_byte()
117 		return byte;  in modem_ppp_wrap_net_pkt_byte()
125 		(void)net_pkt_read_u8(ppp->tx_pkt, &byte);  in modem_ppp_wrap_net_pkt_byte()
126 		ppp->tx_pkt_fcs = modem_ppp_fcs_update(ppp->tx_pkt_fcs, byte);  in modem_ppp_wrap_net_pkt_byte()
128 		if ((byte == MODEM_PPP_CODE_DELIMITER) || (byte == MODEM_PPP_CODE_ESCAPE) ||  in modem_ppp_wrap_net_pkt_byte()
129 		    (byte < MODEM_PPP_VALUE_ESCAPE)) {  in modem_ppp_wrap_net_pkt_byte()
130 			ppp->tx_pkt_escaped = byte ^ MODEM_PPP_VALUE_ESCAPE;  in modem_ppp_wrap_net_pkt_byte()
139 		return byte;  in modem_ppp_wrap_net_pkt_byte()
153 		byte = ppp->tx_pkt_fcs & 0xFF;  in modem_ppp_wrap_net_pkt_byte()
155 		if ((byte == MODEM_PPP_CODE_DELIMITER) || (byte == MODEM_PPP_CODE_ESCAPE) ||  in modem_ppp_wrap_net_pkt_byte()
156 		    (byte < MODEM_PPP_VALUE_ESCAPE)) {  in modem_ppp_wrap_net_pkt_byte()
157 			ppp->tx_pkt_escaped = byte ^ MODEM_PPP_VALUE_ESCAPE;  in modem_ppp_wrap_net_pkt_byte()
163 		return byte;  in modem_ppp_wrap_net_pkt_byte()
170 		byte = (ppp->tx_pkt_fcs >> 8) & 0xFF;  in modem_ppp_wrap_net_pkt_byte()
172 		if ((byte == MODEM_PPP_CODE_DELIMITER) || (byte == MODEM_PPP_CODE_ESCAPE) ||  in modem_ppp_wrap_net_pkt_byte()
173 		    (byte < MODEM_PPP_VALUE_ESCAPE)) {  in modem_ppp_wrap_net_pkt_byte()
174 			ppp->tx_pkt_escaped = byte ^ MODEM_PPP_VALUE_ESCAPE;  in modem_ppp_wrap_net_pkt_byte()
180 		return byte;  in modem_ppp_wrap_net_pkt_byte()
195 static bool modem_ppp_is_byte_expected(uint8_t byte, uint8_t expected_byte)  in modem_ppp_is_byte_expected()  argument
197 	if (byte == expected_byte) {  in modem_ppp_is_byte_expected()
200 	LOG_DBG("Dropping byte 0x%02hhx because 0x%02hhx was expected.", byte, expected_byte);  in modem_ppp_is_byte_expected()
204 static void modem_ppp_process_received_byte(struct modem_ppp *ppp, uint8_t byte)  in modem_ppp_process_received_byte()  argument
208 		if (modem_ppp_is_byte_expected(byte, MODEM_PPP_CODE_DELIMITER)) {  in modem_ppp_process_received_byte()
214 		if (byte == MODEM_PPP_CODE_DELIMITER) {  in modem_ppp_process_received_byte()
217 		if (modem_ppp_is_byte_expected(byte, 0xFF)) {  in modem_ppp_process_received_byte()
225 		if (modem_ppp_is_byte_expected(byte, MODEM_PPP_CODE_ESCAPE)) {  in modem_ppp_process_received_byte()
233 		if (modem_ppp_is_byte_expected(byte, 0x23)) {  in modem_ppp_process_received_byte()
253 		if (byte == MODEM_PPP_CODE_DELIMITER) {  in modem_ppp_process_received_byte()
282 		if (byte == MODEM_PPP_CODE_ESCAPE) {  in modem_ppp_process_received_byte()
287 		if (net_pkt_write_u8(ppp->rx_pkt, byte) < 0) {  in modem_ppp_process_received_byte()
300 		if (net_pkt_write_u8(ppp->rx_pkt, (byte ^ MODEM_PPP_VALUE_ESCAPE)) < 0) {  in modem_ppp_process_received_byte()
359 	uint8_t byte;  in modem_ppp_send_handler()  local
376 			byte = modem_ppp_wrap_net_pkt_byte(ppp);  in modem_ppp_send_handler()
378 			ring_buf_put(&ppp->transmit_rb, &byte, 1);  in modem_ppp_send_handler()