www.pudn.com > tftp.rar > TFTP.H

/* 
**     This product contains: 
**              "Restricted Materials of IBM" 
**              (c) Copyright IBM Corp. 1987 
**              All Rights Reserved 
**              Licensed Materials-Property of IBM 
** 
**     See Copyright Instructions, G120-2083 
** 
*/ 
 
/*  Copyright 1984 by the Massachusetts Institute of Technology  */ 
/*  See permission and disclaimer notice in file "notice.h"  */ 
#include	 
/* (c) 1986 Copyright IBM Corp.; See file  for permissions */ 
 
/* TFTP header file contains structures of TFTP packet headers and such. */ 
 
/* read or write request packet */ 
struct tfreq { 
	unsigned	tf_op;		/* would be 1 (read) or 2 (write) */ 
	char		tf_name[20];	}; 
 
/* data packet */ 
struct tfdata { 
	unsigned	tf_op;		/* would be 3 */ 
	unsigned	tf_block; 
	char		tf_data[512];	}; 
 
/* structure of an ack packet */ 
struct	tfack { 
	unsigned	tf_op;		/* would be 4 */ 
	unsigned	tf_block;	}; 
 
/* error packet */ 
struct tferr { 
	unsigned	tf_op;		/* would be 5 */ 
	unsigned 	tf_code; 
	char		tf_err[1]; }; 
 
/* TFTP opcodes */ 
#define	RRQ	1		/* read  request */ 
#define	WRQ	2		/* write request */ 
#define	DATA	3		/* data packet */ 
#define	ACK	4		/* acknowledgement packet */ 
#define	ERROR	5		/* error packet */ 
 
/* TFTP error codes */ 
#define	ERRTXT		0	/* see the enclosed text */ 
#define	FNOTFOUND	1	/* file not found */ 
#define	ACCESS		2	/* access violation */ 
#define	DISKFULL	3	/* don't even ask. */ 
#define	ILLTFTP		4	/* illegal TFTP operation */ 
#define	BADTID		5	/* unkown transfer ID */ 
#define	FEXISTS		6	/* file already exists */ 
#define	NOUSER		7	/* no such user */ 
 
/* TFTP states */ 
#define	DATAWAIT	1 
#define	ACKWAIT		2 
#define	DEAD		3 
#define	TIMEOUT		4 
#define	RCVERR		5 
#define	RCVACK		6 
#define	RCVDATA		7 
#define	RCVLASTDATA	8 
#define	TERMINATED	9 
 
#define	TFTPSOCK	69	/* TFTP's well known port */ 
#define	TFTPTRIES	20	/* # of retries on packet transmission */ 
#define	REQTRIES	4	/* # of retries on initial request */ 
#define	REQLEN		512	/* .. */ 
#define	NORMLEN		512	/* normal length of received packet */ 
 
#define	tftp_head(p)	udp_data(udp_head(in_head((p)))) 
#define	tfkill(cn)	{tm_clear(cn->tf_tm); (cn)->tf_state=DEAD; tk_wake((cn)->tf_task);} 
#define	tftp_data(p)	((struct tfdata *)tftp_head((p)))->tf_data 
 
/* The TFTP connection structure. Contains connection info, and data for 
	timeout calculations. */ 
 
struct tfconn { 
	UDPCONN		tf_udp;			/* udp connection for this transfer */ 
	FILE		*tf_fd;			/* file descriptor for xfer */ 
	PACKET		tf_outp;		/* last sent packet */ 
	char		*tf_fbufp;		/* file buffer pointer */ 
	unsigned	tf_buff_bytes;	/* number of bytes for disk buffer */ 
	unsigned	tf_bytes_used;	/* disk buffer usage */ 
	unsigned	tf_lastlen;		/* length of last sent pkt */ 
	unsigned	tf_expected;	/* most recently processed block */ 
	unsigned	tf_fport;		/* foreign port */ 
	task		*tf_task;		/* main task for tftp connection */ 
	timer		*tf_tm;			/* our timer */ 
	unsigned	tf_state;		/* state of connection */ 
	unsigned	tf_tries;		/* # of retries already done */ 
	unsigned	tf_mode;		/* mode = OCTET, [net]ASCII, ... */ 
	unsigned	tf_looks_bad;	/* flag if ascii data looks fishy */ 
	unsigned	tf_dir;			/* direction of the transfer */ 
	long		tf_size;		/* # of bytes transferred */ 
	unsigned	tf_rcv;			/* # of packets received */ 
	unsigned	tf_snt;			/* # of packets sent */ 
	unsigned	tf_ous;			/* # of out of sequence packets */ 
	unsigned	tf_tmo;			/* # of timeouts */ 
	unsigned	tf_rsnd;		/* # of resends */ 
	long		tf_trt;			/* round trip time */ 
	long		tf_rt;			/* current timeout */ 
	int		tf_NR;				/* number rexmissions of this pkt */ 
	int		tf_NR_last;			/* "	"	" of prev pkt */ 
	int		tf_K;				/* tuning constant */ 
	long		tf_sent;		/* time that pkt was sent */ 
	int		tf_ctrlz;			/* append a eof mark (^Z) after writing file */ 
}; 
 
/*  Constants for round trip time estimation and retry timeout. 
    All calculation is done in clock ticks (at a rate of 18/second) but 
    only the initial estimate and the upper limit are specimn) is called to set cursor position 
; 
;***************************************************************************** 
        PUBLIC _setcur 
  
_TEXT   SEGMENT 
  
_setcur: 
        push    bp 
        mov     bp,sp 
        mov     dh,4[bp]                ;dh= row, dl= column 
        mov     dl,6[bp]                ;dh= row, dl= column 
        mov     bh,0                    ;ensure page 0 
        mov     ah,2                    ;code for set cursor 
        int     10H                     ;BIOS video i/o code 
        pop     bp                      ;restore bp 
        ret 
  
;***************************************************************************** 
; 
;       wrbuf(->buffer,start_position,num_chars, 
;             attribute-position, ->attr_b