/***************************** Transfer Module ******************************/

#include "zmp.h"
#include <stdio.h>

#include <setjmp.h>
jmp_buf jb_stop;

ovmain(a)
char a;

{
	short result;

	Sending = QuitFlag = StopFlag = FALSE;
	result = (a == 'S' ? sendout(NULL) : bringin(NULL));
	strcpy(Message, "** Transfer ");
	strcat(Message,	(result == OK ?
		"Successful\n" : "Failed\n"));
	return result;
}


sendout(prot)
int prot;
{
	static int kbdata, count, result;

	result = NERROR;
	if (!prot)
		kbdata = protocol(TRUE);
	else
		kbdata = prot;
	flush();

#ifdef HOSTON
	if (Inhost) {
		if (count=getpathname("(s) for Download"))
			mstrout("\nBegin your Download procedure...",TRUE);
	}
	else 
#endif

	count = getpathname("(s) for Transmit");
	if (count) {
		switch(kbdata) {
      			case 'K':
				Blklen = KSIZE;
				Xmodem = TRUE;
				Zmodem = FALSE;
				result = wcsend(1,Pathlist);
				break;

			case 'X':
				Blklen = 128;
				Xmodem = TRUE;
				Zmodem = FALSE;
				result = wcsend(1,Pathlist);
				break;

			case 'Y':
				Zmodem = Xmodem = FALSE;
				result = wcsend(count,Pathlist);
				break;

			default:
			case 'Z':
				Zmodem = TRUE;
				Xmodem = FALSE;
				XonXoffOk = XonXoff;	/* maybe allow xon-xoff */
				result = wcsend(count,Pathlist);
				break;

			case 'A':
				XonXoffOk = XonXoff;
				result = asciisend(Pathlist[0]);
				break;
		}
	}
	endstat(result,count);
	return result;
}

bringin(prot)
int prot;
{
	static int kbdata, count, result;

	count = 0;
	result = NERROR;
	if (Zmodem)
		kbdata = 'Z';	/* auto receive from TERM */
	else {
		if (!prot)
			kbdata = protocol(FALSE);
		else
			kbdata = prot;
	}
	flush();
	switch(kbdata) {
   		case 'X':
#ifdef HOSTON
			if (Inhost) {
				if (count=getpathname(" to Upload"))
					mstrout("\nBegin your Upload ",
						"procedure...",TRUE);
			}
			else
#endif

			count = getpathname(" to Receive");
			if (!count)
				break;
			Zmodem = FALSE;
			Nozmodem = Xmodem = TRUE;
			result = wcreceive(Pathlist[0]);      /* just one file */
			break;

		case 'Y':
			Zmodem = Xmodem = FALSE;
			Nozmodem = TRUE;

#ifdef HOSTON
			if (Inhost)
				mstrout("\nBegin your Upload procedure...",TRUE);
#endif

			result = wcreceive(NULL);
			break;

		default:
		case 'Z':
			Zmodem = TRUE;
			Nozmodem = Xmodem = FALSE;

#ifdef HOSTON
			if (Inhost)
				mstrout("\nBegin your Upload procedure...",TRUE);
#endif

			result = wcreceive(NULL);
			break;
	}
	endstat(result,count);
	return result;
}

/* Clean up at end and report */
endstat(result, count)
int result, count;
{
	XonXoffOk = FALSE;	/* disable xon-xoff */
	freepath(count);
	LOCATE(BR+2,1);
	printf("\nTransfer %s\n",result==OK?"Successful":"Aborted");
	flush();
}

protocol(for_send)
int for_send;        /* select block size in transmit only */
{
	static int c;
	static char *buffer;
   
	buffer = Pathname;
	sprintf(buffer,"\n%sXmodem, %sYmodem, or Zmodem? (%sX,%sY,Z) <Z>  ",
		for_send ? "ASCII, " : "",
		for_send ? "Xmodem-1k, " : "",
		for_send ? "A," : "",
		for_send ? "K," : "" );

#ifdef HOSTON
	if (Inhost) {
		mstrout(buffer,TRUE);
		purgeline();
		c = toupper(mgetchar(20));
		if (c == CR)
			c = 'Z';
		mcharout(c);
		return c;
	}
   else {
#endif

	printf(buffer);
	flush();
	c = toupper(chrin());

#ifdef HOSTON
	}
#endif

	return c;
}


/* crctab calculated by Mark G. Mendel, Network Systems Corporation */
static unsigned crctab[256] = {
	0x0000,  0x1021,  0x2042,  0x3063,  0x4084,  0x50a5,  0x60c6,  0x70e7,
	0x8108,  0x9129,  0xa14a,  0xb16b,  0xc18c,  0xd1ad,  0xe1ce,  0xf1ef,
	0x1231,  0x0210,  0x3273,  0x2252,  0x52b5,  0x4294,  0x72f7,  0x62d6,
	0x9339,  0x8318,  0xb37b,  0xa35a,  0xd3bd,  0xc39c,  0xf3ff,  0xe3de,
	0x2462,  0x3443,  0x0420,  0x1401,  0x64e6,  0x74c7,  0x44a4,  0x5485,
	0xa56a,  0xb54b,  0x8528,  0x9509,  0xe5ee,  0xf5cf,  0xc5ac,  0xd58d,
	0x3653,  0x2672,  0x1611,  0x0630,  0x76d7,  0x66f6,  0x5695,  0x46b4,
	0xb75b,  0xa77a,  0x9719,  0x8738,  0xf7df,  0xe7fe,  0xd79d,  0xc7bc,
	0x48c4,  0x58e5,  0x6886,  0x78a7,  0x0840,  0x1861,  0x2802,  0x3823,
	0xc9cc,  0xd9ed,  0xe98e,  0xf9af,  0x8948,  0x9969,  0xa90a,  0xb92b,
	0x5af5,  0x4ad4,  0x7ab7,  0x6a96,  0x1a71,  0x0a50,  0x3a33,  0x2a12,
	0xdbfd,  0xcbdc,  0xfbbf,  0xeb9e,  0x9b79,  0x8b58,  0xbb3b,  0xab1a,
	0x6ca6,  0x7c87,  0x4ce4,  0x5cc5,  0x2c22,  0x3c03,  0x0c60,  0x1c41,
	0xedae,  0xfd8f,  0xcdec,  0xddcd,  0xad2a,  0xbd0b,  0x8d68,  0x9d49,
	0x7e97,  0x6eb6,  0x5ed5,  0x4ef4,  0x3e13,  0x2e32,  0x1e51,  0x0e70,
	0xff9f,  0xefbe,  0xdfdd,  0xcffc,  0xbf1b,  0xaf3a,  0x9f59,  0x8f78,
	0x9188,  0x81a9,  0xb1ca,  0xa1eb,  0xd10c,  0xc12d,  0xf14e,  0xe16f,
	0x1080,  0x00a1,  0x30c2,  0x20e3,  0x5004,  0x4025,  0x7046,  0x6067,
	0x83b9,  0x9398,  0xa3fb,  0xb3da,  0xc33d,  0xd31c,  0xe37f,  0xf35e,
	0x02b1,  0x1290,  0x22f3,  0x32d2,  0x4235,  0x5214,  0x6277,  0x7256,
	0xb5ea,  0xa5cb,  0x95a8,  0x8589,  0xf56e,  0xe54f,  0xd52c,  0xc50d,
	0x34e2,  0x24c3,  0x14a0,  0x0481,  0x7466,  0x6447,  0x5424,  0x4405,
	0xa7db,  0xb7fa,  0x8799,  0x97b8,  0xe75f,  0xf77e,  0xc71d,  0xd73c,
	0x26d3,  0x36f2,  0x0691,  0x16b0,  0x6657,  0x7676,  0x4615,  0x5634,
	0xd94c,  0xc96d,  0xf90e,  0xe92f,  0x99c8,  0x89e9,  0xb98a,  0xa9ab,
	0x5844,  0x4865,  0x7806,  0x6827,  0x18c0,  0x08e1,  0x3882,  0x28a3,
	0xcb7d,  0xdb5c,  0xeb3f,  0xfb1e,  0x8bf9,  0x9bd8,  0xabbb,  0xbb9a,
	0x4a75,  0x5a54,  0x6a37,  0x7a16,  0x0af1,  0x1ad0,  0x2ab3,  0x3a92,
	0xfd2e,  0xed0f,  0xdd6c,  0xcd4d,  0xbdaa,  0xad8b,  0x9de8,  0x8dc9,
	0x7c26,  0x6c07,  0x5c64,  0x4c45,  0x3ca2,  0x2c83,  0x1ce0,  0x0cc1,
	0xef1f,  0xff3e,  0xcf5d,  0xdf7c,  0xaf9b,  0xbfba,  0x8fd9,  0x9ff8,
	0x6e17,  0x7e36,  0x4e55,  0x5e74,  0x2e93,  0x3eb2,  0x0ed1,  0x1ef0
};

/*
 * updcrc macro derived from article Copyright (C) 1986 Stephen Satchell. 
 *  NOTE: First argument must be in range 0 to 255.
 *        Second argument is referenced twice.
 * 
 * Programmers may incorporate any or all code into their programs, 
 * giving proper credit within the source. Publication of the 
 * source routines is permitted so long as proper credit is given 
 * to Stephen Satchell, Satchell Evaluations and Chuck Forsberg, 
 * Omen Technology.
 */

updcrc(cp, crc)
unsigned cp, crc;
{
   return ( crctab[((crc >> 8) & 255)] ^ (crc << 8) ^ cp);
}

/*
 * Copyright (C) 1986 Gary S. Brown.  You may use this program, or
 * code or tables extracted from it, as desired without restriction.
 */

/* First, the polynomial itself and its table of feedback terms.  The  */
/* polynomial is                                                       */
/* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 */
/* Note that we take it "backwards" and put the highest-order term in  */
/* the lowest-order bit.  The X^32 term is "implied"; the LSB is the   */
/* X^31 term, etc.  The X^0 term (usually shown as "+1") results in    */
/* the MSB being 1.                                                    */

/* Note that the usual hardware shift register implementation, which   */
/* is what we're using (we're merely optimizing it by doing eight-bit  */
/* chunks at a time) shifts bits into the lowest-order term.  In our   */
/* implementation, that means shifting towards the right.  Why do we   */
/* do it this way?  Because the calculated CRC must be transmitted in  */
/* order from highest-order term to lowest-order term.  UARTs transmit */
/* characters in order from LSB to MSB.  By storing the CRC this way,  */
/* we hand it to the UART in the order low-byte to high-byte; the UART */
/* sends each low-bit to hight-bit; and the result is transmission bit */
/* by bit from highest- to lowest-order term without requiring any bit */
/* shuffling on our part.  Reception works similarly.                  */

/* The feedback terms table consists of 256, 32-bit entries.  Notes:   */
/*                                                                     */
/*     The table can be generated at runtime if desired; code to do so */
/*     is shown later.  It might not be obvious, but the feedback      */
/*     terms simply represent the results of eight shift/xor opera-    */
/*     tions for all combinations of data and CRC register values.     */
/*                                                                     */
/*     The values must be right-shifted by eight bits by the "updcrc"  */
/*     logic; the shift must be unsigned (bring in zeroes).  On some   */
/*     hardware you could probably optimize the shift in assembler by  */
/*     using byte-swap instructions.                                   */

static long cr3tab[] = { /* CRC polynomial 0xedb88320 */

	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
	0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
	0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
	0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
	0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
	0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
	0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
	0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
	0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
	0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
	0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
	0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
	0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
	0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
	0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
	0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
	0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
	0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
	0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
	0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};

long
updc32(b,c)
int b;
long c;
{
	return (cr3tab[((int)c ^ b) & 0xff] ^ ((c >> 8) & 0x00FFFFFF));
}



asciisend(file)  /* send ascii file with xon/xoff protocol */
char *file;
{
	char *grabmem();
	static int fd, status, bytes, c, dflag;
	static char *inbuf, ch;
	static unsigned j, bufsize;

	status = NERROR;
	inbuf = grabmem(&bufsize);
	if (allocerror(inbuf))
		return NERROR;

	fd = open(file, 0);
	if (openerror(fd, file, UBIOT)) {
		free(inbuf);
		return NERROR;
	}

	printf("\nWant time delays? ");
	dflag = ((ch = toupper(chrin())) == 'Y');

#ifdef   DEBUG
	printf("\nbufsize = %d\n",bufsize);
#endif

	sprintf(Buf,"Sending %s, ASCII Transfer",file);
	putlabel(Buf);
	j = 0;

	while ((bytes = read(fd,inbuf,bufsize)) > 0) {
		c = inbuf[0];
		for (j = 0; (j < bytes) && (c != CTRLZ); c = inbuf[++j]) {
			xmchout(c);
			opabort();
			if (QuitFlag || StopFlag) /* xmchout tests for xoff */
				goto cleanup;	/* abort */
			putchar(c);
			if ((c & 0x7f) == CR) {
				if (dflag && Linedelay)
					mswait(Linedelay);
			}
			else {
				if (dflag && Chardelay)
					mswait(Chardelay);
			}
			if (QuitFlag == TRUE)
				goto cleanup;
		}
	}
	status = OK;

cleanup:
	close(fd);
	free(inbuf);
	return status;
}

checkpath(name)  /* eliminate bad paths in receive */
char *name;
{
	char *p, c, *index();
	short i;
	static char badchar[] = ",;:_[]=<>/";	/* disallowed f/n characters */

	for (p = name; *p; p++) {             /* dump strange characters */
		if (!(((c = *p) > '!') && (c < 0x7f) && !index(badchar,c))) {
			*p = '\0';
			strcat(name, p+1);
		}
	}
	if ((i = index(name, '.') - name) > 8) {
		p = name + i;
		name[8] = '.';
		name[9] = '\0';
		p[3] = '\0';
		strcat(name, p);
	}
	name[12] = '\0';
	report(PATHNAME,name);
}

/* output a character to the modem and test the receive channel */
xmchout(c)
char c;
{
	testrxc(200);	/* test receive channel */
	mcharout(c);	/* then send it */
}

/* Test receive channel for xon/xoff and interrupt while sending */
testrxc(timeout)
short timeout;		/* timeout in seconds */
{
	static char c;

	c = minprdy() ? mcharinp() : '\0';	/* get a character if any */
	if (c) {
		if (XonXoffOk && (c == CTRLS)) {
			while (((c = readline(10)) != CTRLQ) && timeout--);
			if (c < 1)
				c = CTRLC;	/* timeout */
		}
		StopFlag = ((c == CTRLC) || (c == CTRLX) || (c == '*'));
		if (StopFlag && Zmodem && Sending)
			longjmp(jb_stop,c);	/* zmodem transmit interrupt */
	}
}

/*		End of Transfer Overlay File #1 */