/*
 * Copyright (c) 2023 joshua stein <jcs@jcs.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef __NOMODEM_H__
#define __NOMODEM_H__

#include "session.h"
#include "util.h"

/* handshake sequence */
#define NOMODEM_START0		0x01
#define NOMODEM_START1		0x00
#define NOMODEM_START2		0x01
#define NOMODEM_START3		0x00

/* then a version */
#define NOMODEM_VERSION		0x01

/* then a command */
#define NOMODEM_CMD_SEND	0x01	/* we are sending you a file */
#define NOMODEM_CMD_RECEIVE	0x02	/* please upload a file to us */

#define NOMODEM_ACK			0x01
#define NOMODEM_CANCEL		0x03	/* ^C */

#define NOMODEM_TIMEOUT		20

enum {
	NOMODEM_MODE_SENDING,
	NOMODEM_MODE_RECEIVING
};

struct nomodem_session {
	struct session *session;
	
	short mode;
	FILE *file;
	unsigned long file_size;
	char file_name[64];
	char *file_path;
	bool need_header;
	bool need_header_ack;
	unsigned long last_input;
	
	unsigned char *buf;
	size_t buf_size;
};

struct nomodem_session * nomodem_send(struct session *s, FILE *fp,
  char *filename);
struct nomodem_session * nomodem_receive(struct session *s, char *path);
bool nomodem_timed_out(struct nomodem_session *ns);
bool nomodem_continue(struct nomodem_session *ns);
void nomodem_finish(struct nomodem_session **nsp);
unsigned short nomodem_get_char(struct nomodem_session *ns);

#endif