/*

 * Copyright (c) 1983, 1993

 *	The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#define	PKTSIZE	SEGSIZE+4

#ifndef _ARPA_TFTP_H

#define _ARPA_TFTP_H

/*

 * Trivial File Transfer Protocol (IEN-133)

 */

#define	SEGSIZE		512		/* data segment size */

/*

 * Packet types.

 */

#define	RRQ	01			/* read request */

#define	WRQ	02			/* write request */

#define	DATA	03			/* data packet */

#define	ACK	04			/* acknowledgement */

#define	ERROR	05			/* error code */

struct	tftphdr {

	short	th_opcode;		/* packet type */

	union {

		short	tu_block;	/* block # */

		short	tu_code;	/* error code */

		char	tu_stuff[1];	/* request packet stuff */

	} th_u;

	char	th_data[1];		/* data or error string */

};

#define	th_block	th_u.tu_block

#define	th_code		th_u.tu_code

#define	th_stuff	th_u.tu_stuff

#define	th_msg		th_data

/*

 * Error codes.

 */

#define	EUNDEF		0		/* not defined */

#define	ENOTFOUND	1		/* file not found */

#define	EACCESS		2		/* access violation */

#define	ENOSPACE	3		/* disk full or allocation exceeded */

#define	EBADOP		4		/* illegal TFTP operation */

#define	EBADID		5		/* unknown transfer ID */

#define	EEXISTS		6		/* file already exists */

#define	ENOUSER		7		/* no such user */

extern int readit(FILE * file, struct tftphdr **dpp, int convert);

extern void read_ahead(FILE *file, int convert);

extern int writeit(FILE *file, struct tftphdr **dpp, int ct, int convert);

extern int write_behind(FILE *file, int convert);

extern int synchnet(int f);

extern struct tftphdr *w_init(void);

extern struct tftphdr *r_init(void);

#endif /* _ARPA_TFTP_H */