/*
 * zmdm.h
 * zmodem primitives prototypes and global data
 * (C) Mattheij Computer Service 1994
 */

#ifndef _ZMDM_H

#define _ZMDM_H

#ifdef ZMDM
#define EXTERN
#else
#define EXTERN extern
#endif

#include <errno.h>

#define TRUE  1
#define FALSE 0

#define ENDOFFRAME 2
#define FRAMEOK    1
#define TIMEOUT   -1											/* rx routine did not receive a character within timeout */
#define INVHDR    -2											/* invalid header received; but within timeout */
#define INVDATA   -3											/* invalid data subpacket received */
#define ZDLEESC 0x8000											/* one of ZCRCE; ZCRCG; ZCRCQ or ZCRCW was received; ZDLE escaped */

#define HDRLEN     5											/* size of a zmodme header */

#ifdef MIT_DEBUG
EXTERN FILE *debugfp;

#define DEBUG_MSG(string) { open_debug_file(); fprintf(debugfp, "%s %d: %s\n", __FILE__, __LINE__, string); }
#define DEBUG_CHAR(c) { open_debug_file(); fprintf(debugfp, "%s %d: %02x %c\n", __FILE__, __LINE__, (int)(c), (char)(c)); }
#else /* MIT_DEBUG */
#define DEBUG_MSG(string)
#define DEBUG_CHAR(c)
#endif /* MIT_DEBUG */

EXTERN int in_fp;												/* input file descriptor */
EXTERN int out_fp;												/* output file descriptor */
EXTERN unsigned char rxd_header[ZMAXHLEN];						/* last received header */
EXTERN int rxd_header_len;										/* last received header size */

/*
 * receiver capability flags
 * extracted from the ZRINIT frame as received
 */

EXTERN int can_full_duplex;
EXTERN int can_overlap_io;
EXTERN int can_break;
EXTERN int can_fcs_32;
EXTERN int escape_all_control_characters;						/* guess */
EXTERN int escape_8th_bit;

EXTERN int use_variable_headers;								/* use variable length headers */

/*
 * file management options.
 * only one should be on
 */

EXTERN int management_newer;
EXTERN int management_clobber;
EXTERN int management_protect;

void
fd_init(void);													/* make the io channel raw */

void
fd_exit(void);													/* reset io channel to state before zmtx was called */

void
tx_hheader(unsigned char * buf,int n);

void
tx_bheader(unsigned char * buf,int n);

int
rx_header(int to);												/* receive any header with timeout in milliseconds */

#endif