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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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vol_200
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260_01
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zm.c
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1988-02-23
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730 lines
/*
* Z M . C
* ZMODEM protocol primitives
* 01-15-87 Chuck Forsberg Omen Technology Inc
*
* Entry point Functions:
* zsbhdr(type, hdr) send binary header
* zshhdr(type, hdr) send hex header
* zgethdr(hdr, eflag) receive header - binary or hex
* zsdata(buf, len, frameend) send data
* zrdata(buf, len) receive data
* stohdr(pos) store position data in Txhdr
* long rclhdr(hdr) recover position offset from header
*/
#ifndef CANFDX
#include "zmodem.h"
int Rxtimeout = 100; /* Tenths of seconds to wait for something */
#endif
static char *frametypes[] =
{
"Carrier Lost", /* -3 */
"TIMEOUT", /* -2 */
"ERROR", /* -1 */
#define FTOFFSET 3
"ZRQINIT",
"ZRINIT",
"ZSINIT",
"ZACK",
"ZFILE",
"ZSKIP",
"ZNAK",
"ZABORT",
"ZFIN",
"ZRPOS",
"ZDATA",
"ZEOF",
"ZFERR",
"ZCRC",
"ZCHALLENGE",
"ZCOMPL",
"ZCAN",
"ZFREECNT",
"ZCOMMAND",
"ZSTDERR",
"xxxxx"
#define FRTYPES 22 /* Total number of frame types in this array */
/* not including psuedo negative entries */
};
/* Send ZMODEM binary header hdr of type type */
zsbhdr(type, hdr)
char *hdr;
{
int n;
unsigned short crc;
vfile("zsbhdr: %s %lx", frametypes[type+FTOFFSET], rclhdr(hdr));
if (type == ZDATA)
for (n = Znulls; --n >= 0; )
zsendline(0);
xsendline(ZPAD);
xsendline(ZDLE);
if (Txfcs32)
zsbh32(hdr, type);
else
{
xsendline(ZBIN);
zsendline(type);
crc = updcrc(type, 0);
for (n = 4; --n >= 0; )
{
zsendline(*hdr);
crc = updcrc((0377& *hdr++), crc);
}
crc = updcrc(0,updcrc(0,crc));
zsendline(crc>>8);
zsendline(crc);
}
if (type != ZDATA)
flushmo();
}
/* Send ZMODEM binary header hdr of type type */
zsbh32(hdr, type)
char *hdr;
{
int n;
unsigned long crc;
xsendline(ZBIN32);
zsendline(type);
crc = UPDC32(type, 0xFFFFFFFF);
for (n = 4; --n >= 0; )
{
zsendline(*hdr);
crc = UPDC32((0377& *hdr++), crc);
}
crc = ~crc;
for (n = 4; --n >= 0;)
{
zsendline(crc);
crc >>= 8;
}
}
/* Send ZMODEM HEX header hdr of type type */
zshhdr(type, hdr)
char *hdr;
{
int n;
unsigned short crc;
vfile("zshhdr: %s %lx", frametypes[type+FTOFFSET], rclhdr(hdr));
sendline(ZPAD);
sendline(ZPAD);
sendline(ZDLE);
sendline(ZHEX);
zputhex(type);
crc = updcrc(type, 0);
for (n = 4; --n >= 0; )
{
zputhex(*hdr);
crc = updcrc((0377& *hdr++), crc);
}
crc = updcrc(0,updcrc(0,crc));
zputhex(crc>>8);
zputhex(crc);
/* Make it printable on remote machine */
sendline(015);
sendline(012);
/*
* Uncork the remote in case a fake XOFF has stopped data flow
*/
if (type != ZFIN)
sendline(021);
flushmo();
}
/*
* Send binary array buf of length length, with ending ZDLE sequence frameend
*/
zsdata(buf, length, frameend)
char *buf;
{
unsigned short crc;
vfile("zsdata: length=%d end=%x", length, frameend);
if (Txfcs32)
zsda32(buf, length, frameend);
else
{
crc = 0;
for ( ; --length >= 0; )
{
zsendline(*buf);
crc = updcrc((0377& *buf++), crc);
}
xsendline(ZDLE);
xsendline(frameend);
crc = updcrc(frameend, crc);
crc = updcrc(0,updcrc(0,crc));
zsendline(crc>>8);
zsendline(crc);
}
if (frameend == ZCRCW)
{
xsendline(XON);
flushmo();
}
}
zsda32(buf, length, frameend)
char *buf;
{
unsigned long crc;
crc = 0xFFFFFFFF;
for ( ;--length >= 0; )
{
zsendline(*buf);
crc = UPDC32((0377& *buf++), crc);
}
xsendline(ZDLE);
xsendline(frameend);
crc = UPDC32(frameend, crc);
crc = ~crc;
for (length = 4; --length >= 0; )
{
zsendline(crc);
crc >>= 8;
}
}
/*
* Receive array buf of max length with ending ZDLE sequence
* and CRC. Returns the ending character or error code.
*/
zrdata(buf, length)
char *buf;
{
int c;
unsigned short crc;
int d;
if (Rxframeind == ZBIN32)
return(zrdat32(buf, length));
crc = Rxcount = 0;
for (;;)
{
if ((c = zdlread()) & ~0377)
{
crcfoo:
switch (c)
{
case GOTCRCE:
case GOTCRCG:
case GOTCRCQ:
case GOTCRCW:
crc = updcrc((d=c)&0377, crc);
if ((c = zdlread()) & ~0377)
goto crcfoo;
crc = updcrc(c, crc);
if ((c = zdlread()) & ~0377)
goto crcfoo;
crc = updcrc(c, crc);
if (crc & 0xFFFF)
{
zperr("Bad data CRC %x", crc);
return(ERROR);
}
vfile("zrdata: cnt = %d ret = %x", Rxcount, d);
return(d);
case GOTCAN:
zperr("ZMODEM: Sender Canceled");
return(ZCAN);
case TIMEOUT:
zperr("ZMODEM data TIMEOUT");
return(c);
default:
zperr("ZMODEM bad data subpacket ret=%x", c);
return(c);
}
}
if (--length < 0)
{
zperr("ZMODEM data subpacket too long");
return(ERROR);
}
++Rxcount;
*buf++ = c;
crc = updcrc(c, crc);
continue;
}
}
zrdat32(buf, length)
char *buf;
{
int c;
unsigned long crc;
int d;
crc = 0xFFFFFFFF;
Rxcount = 0;
for (;;)
{
if ((c = zdlread()) & ~0377)
{
crcfoo:
switch (c)
{
case GOTCRCE:
case GOTCRCG:
case GOTCRCQ:
case GOTCRCW:
crc = UPDC32((d=c)&0377, crc);
if ((c = zdlread()) & ~0377)
goto crcfoo;
crc = UPDC32(c, crc);
if ((c = zdlread()) & ~0377)
goto crcfoo;
crc = UPDC32(c, crc);
if ((c = zdlread()) & ~0377)
goto crcfoo;
crc = UPDC32(c, crc);
if ((c = zdlread()) & ~0377)
goto crcfoo;
crc = UPDC32(c, crc);
if (crc != 0xDEBB20E3)
{
zperr("Bad data CRC %lX", crc);
return(ERROR);
}
vfile("zrdat32: cnt = %d ret = %x", Rxcount, d);
return(d);
case GOTCAN:
zperr("ZMODEM: Sender Canceled");
return(ZCAN);
case TIMEOUT:
zperr("ZMODEM data TIMEOUT");
return(c);
default:
zperr("ZMODEM bad data subpacket ret=%x", c);
return(c);
}
}
if (--length < 0)
{
zperr("ZMODEM data subpacket too long");
return(ERROR);
}
++Rxcount;
*buf++ = c;
crc = UPDC32(c, crc);
continue;
}
}
/*
* Read a ZMODEM header to hdr, either binary or hex.
* eflag controls local display of non zmodem characters:
* 0: no display
* 1: display printing characters only
* 2: display all non ZMODEM characters
* On success, set Zmodem to 1 and return type of header.
* Otherwise return negative on error
*/
zgethdr(hdr, eflag)
char *hdr;
{
int c, n, cancount;
n = Baudrate; /* Max characters before start of frame */
cancount = 5;
again:
Rxframeind = Rxtype = 0;
switch (c = noxread7())
{
case RCDO:
case TIMEOUT:
goto fifi;
case CAN: