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xyzgen.c
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C/C++ Source or Header
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1994-10-02
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14KB
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364 lines
/*/////////////////////////////////////////////////////////////////////
// //
// XYZGEN.C -- functions common to xmodem, ymodem, zmodem //
// //
// (c) 1991, Mike Dumdei, 6 Holly Lane, Texarkana TX, 75503 //
// //
//////////////////////////////////////////////////////////////////// */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <dos.h>
#include <bios.h>
#include "comm.h"
#include "extra.h"
#include "zmdos.h"
#ifdef __TURBOC__
#include <dir.h>
#endif
/*--------------------------------------------------------------------+
| |
| Data Section |
| |
+--------------------------------------------------------------------*/
#define GLOBAL
/*--------------------------------------------+
| initialized globals used by x,y,zmodem |
+--------------------------------------------*/
GLOBAL ASYNC *tPort = NULL; /* pointer to port structure */
GLOBAL char *DfltPath = ""; /* default download path */
GLOBAL long ConnectBaud = 0L; /* set to connect rate if using fixed link */
GLOBAL int RxTimeOut = 182; /* receive char timeout in ticks (1/18 s.) */
GLOBAL int DefRxTimeOut = 182; /* default value for RxTimeOut */
GLOBAL int VBufSize = 2048; /* size of variable disk buffer to use */
GLOBAL WORD BufSize = 0; /* 0 if overlaying I/O, else <= VBufSize */
GLOBAL TFLAGS TFlag = { 0x29 }; /* transfer flags (resume,keeptime,ign car) */
/*--------------------------------------------+
| uninitialized globals used by x,y,zmodem |
+--------------------------------------------*/
GLOBAL char *PathName = NULL; /* full pathname of current file */
GLOBAL char *NameExt = NULL; /* name and extension only of current file */
GLOBAL long FilePos = 0L; /* current file offset */
GLOBAL long FileSize = 0L; /* length of current file */
GLOBAL int BlkLen = 0; /* current block length */
GLOBAL int BytesRxd = 0; /* # bytes in last data packet received */
GLOBAL BYTE *IOBuf = NULL; /* I/O buffer */
GLOBAL BYTE RxQueue[128] = ""; /* receive queue */
GLOBAL BYTE *RxQPtr = NULL; /* pointer to current RxQueue position */
GLOBAL int RxBytesQd = 0; /* bytes in receive queue */
/*--------------------------------------------+
| static variables |
+--------------------------------------------*/
static FILE *tFh = NULL; /* file handle of current file */
static BYTE *VBuf = NULL; /* buffer for setvbuf */
static int XoffFlow = 0; /* XOFF flow control active */
static int CTSFlow = B_CTS; /* CTS flow control inactive (CTS high) */
/*--------------------------------------------+
| 16 bit CRC table |
+--------------------------------------------*/
GLOBAL WORD Crc16Tbl[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
};
/*--------------------------------------------------------------------+
| |
| Code Section |
| |
+--------------------------------------------------------------------*/
/*/////////////////////////////////////////////////////////
// AsyncMode - save/set/restore async mode of operation //
/////////////////////////////////////////////////:async: */
void _C_ AsyncMode(int mode)
{
static char params[10];
static BYTE xmode, modeset = 0;
char *n_params;
BYTE n_xmode;
if (mode != 0) /* 1 = xflow, 2 = no xflow */
{ /* both 1 & 2 set "N81" */
if (modeset == 0)
{
xmode = tPort->Stat3 & (B_XUSET | B_XUSER);
strcpy(params, tPort->BPDSstr);
++modeset;
}
n_xmode = (mode == 1) ? B_XUSE : 0;
strcpy((strchr(n_params = tPort->BPDSstr, '\0') - 3), "N81");
}
else
{
if (modeset == 0)
return;
--modeset;
n_xmode = xmode; /* restore configuration */
n_params = params;
}
async_xflow(tPort, n_xmode);
async_setbpds(tPort, n_params);
}
/*/////////////////////////////////////////////////////////
// Blk16Crc - calculates 16 bit crc for a block of bytes//
// returns: 16 bit crc //
///////////////////////////////////////////////////:crc: */
WORD _C_ Blk16Crc(register BYTE *block, int bytes)
{
register WORD crc = 0;
while (bytes--)
crc = Upd16Crc(crc, *block++);
return (crc);
}
/*/////////////////////////////////////////////////////////
// CloseFile -- close disk file //
// statics: VBuf, tFh //
//////////////////////////////////////////////////:disk: */
void _C_ CloseFile(void)
{
if (tFh == NULL)
return;
if (TFlag.F.Receiving && TFlag.F.KeepTime)
{
fflush(tFh);
UnixToDos(&DosTime, &DosDate, RxdUnixTime);
DosSetFileTime(fileno(tFh), DosDate, DosTime);
}
fclose(tFh);
tFh = NULL;
if (VBuf != NULL)
free(VBuf), VBuf = NULL;
}
/*/////////////////////////////////////////////////////////
// FlushDisk -- flush file buffers //
//////////////////////////////////////////////////:disk: */
void _C_ FlushDisk(void)
{
fflush(tFh);
}
/*/////////////////////////////////////////////////////////
// GetNameExt -- get pointer