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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_400
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422_02
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laptalk
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xmodem.c
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C/C++ Source or Header
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1994-03-20
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10KB
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352 lines
/*
* XMODEM file transfer module for LAPTALK...
*
* Copyright 1991-1994 Dave Dunfield
* All rights reserved.
*
* Permission granted for personal (non-commercial) use only.
*
* Compile with DDS MICRO-C compiler in 8086 TINY model.
*
* Compile command: cc xmodem -fop
*/
#include <stdio.h>
#include <window.h>
#include <comm.h>
/* Transfer status codes */
#define INIT 0 /* Initializing line */
#define RX 1 /* Receive packet */
#define TX 2 /* Transmitting packet */
#define TIMEOUT 3 /* Timeout occured */
#define RNAK 4 /* Nak received */
#define ERROR 5 /* Checksum/CRC error */
#define ABORT 6 /* Abort request */
#define ENDF 7 /* End of file */
#define DUP 8 /* Duplicate packet */
#define SEQ 9 /* Out of sequence */
/* Line control codes */
#define SOH 0x01 /* start of header */
#define ACK 0x06 /* Acknowledge */
#define NAK 0x15 /* Negative acknowledge */
#define CAN 0x18 /* Cancel */
#define EOT 0x04 /* end of text */
char *baudtext[] = {
"110", "300", "1200", "2400", "4800", "9600", "19200", "38400" };
unsigned baudvalue[] = {
_110, _300, _1200, _2400, _4800, _9600, _19200, _38400 };
unsigned baud=3, block_num = 0, rx_block, last_stat = 0,
size = 128, port = 1, ccount = 3;
char *status_text[] = {
"Initiate", "RX packet", "TX packet", "Timeout", "NAK received",
"Bad Packet", "Abort", "End of file", "Duplicate", "Sequence error" };
char *filename = 0, upload = -1, pause = 0, crc = -1, last_crc = -2,
fill = 'Z'-0x40;
FILE *fp;
unsigned crctable[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 };
/*
* Main routine
*/
main(argc, argv)
int argc;
char *argv[];
{
int i, j;
char *ptr, *buffer;
for(i=1; i < argc; ++i) {
ptr = argv[i];
switch((toupper(*ptr++)<<8)|toupper(*ptr++)) {
case '-D' : upload = 0; break;
case '-P' : pause = -1; break;
case '-C' : crc = 0; break;
case 'R=' : size = atoi(ptr); break;
case 'P=' : port = atoi(ptr); break;
case 'F=' : fill = atoi(ptr); break;
case 'S=' : /* Speed */
for(j=0; j < (sizeof(baudtext)/2); ++j) {
if(!strcmp(ptr, baudtext[j])) {
baud = j;
goto gobreak; } }
abort("XMODEM: Unknown baud rate");
default :
if(filename)
abort("XMODEM: Too many operands");
filename = argv[i];
gobreak: } }
if(!filename)
abort("\nUse: XMODEM <filename> [-C -D -P R=size P=port F=value S=speed]\n\nCopyright 1991-1994 Dave Dunfield\nAll rights reserved.\n");
buffer = malloc(size);
wopen(15, 6, 50, 13, WSAVE|WCOPEN|WBOX1|0x70);
wcursor_off();
wgotoxy(1, 1); printf("XMODEM %s of %s", upload ? "Upload" : "Download", filename);
if(!(fp = fopen(filename, upload ? "rb" : "wb"))) {
wgotoxy(8, 5); wputs(" ** Unable to access file! **");
pause = -1;
goto doexit1; }
Copen(port, baudvalue[baud], PAR_NO|STOP_1|DATA_8, SET_RTS|SET_DTR|OUTPUT_2);
disable();
Cflags |= TRANSPARENT;
enable();
wgotoxy(1, 3); printf("Record size : %u", size);
wgotoxy(1, 5); printf("Blockcheck :");
wgotoxy(1, 7); printf("Transfer status: %s", status_text[0]);
wgotoxy(1, 9); printf("Record count : %u", block_num);
if(!upload) {
Cputc(crc ? 'C' : NAK);
upld:
update_status(i = get_record(buffer));
switch(i) {
case RX :
if(rx_block == (++block_num & 255)) {
fwrite(buffer, size, fp);
Cputc(ACK);
wgotoxy(18, 9); wprintf("%u", block_num);
goto upld; }
if(rx_block == (--block_num & 255)) {
Cputc(ACK);
update_status(DUP);
goto upld;}
update_status(SEQ);
case ERROR :
do {
if((i = get_char(1)) == -2)
goto doabort; }
while(i != -1);
Cputc(NAK);
goto upld;
case TIMEOUT :
if(!block_num) {
if(crc && ccount) {
--ccount;
Cputc('C');
goto upld; }
crc = 0; }
Cputc(NAK);
default:
goto upld;
case ENDF :
Cputc(ACK);
doabort:
case ABORT: } }
else {
/* First, handshake for CRC option */
if(!crc)
goto dnl1;
crc = 0;
dnl0: switch(get_char(10)) {
default: goto dnl0;
case 'C' :
crc = -1;
break;
case -2: Cputc(CAN); goto doexit;
case NAK :
crc = 0; }
dnl1: if(j = fread(buffer, size, fp)) {
for(i=j; i < size; ++i)
buffer[i] = fill;
dnl2: update_status(i = send_record(buffer));
switch(i) {
case TX :
wgotoxy(18, 9); wprintf("%u", ++block_num);
goto dnl1;
case RNAK :
case TIMEOUT :
goto dnl2;
case ABORT :
Cputc(CAN);
goto doexit;
default: } }
else
update_status(ENDF);
dnl3: Cputc(EOT);
dnl4: switch(i = get_char(1)) {
case NAK :
case -1 : goto dnl3;
default : goto dnl4;
case -2 :
case ACK: } }
doexit:
fclose(fp);
Cclose();
doexit1:
if(pause) {
wgotoxy(10, 10);
wputs("<Press any key to proceed>");
wgetc(); }
wclose();
}
/*
* Update the status message
*/
update_status(msg)
int msg;
{
if(msg != last_stat) {
wgotoxy(18, 7);
wputs(status_text[last_stat = msg]);
wcleol(); }
if(crc != last_crc) {
wgotoxy(18, 5);
wputs((last_crc = crc) ? "Crc" : "Checksum");
wcleol(); }
}
/*
* Send an XMODEM record
*/
send_record(data)
char *data;
{
unsigned i, c, chk;
Cputc(SOH);
Cputc(block_num+1);
Cputc(~(block_num+1));
for(i=chk=0; i < size; ++i) {
Cputc(c = *data++);
chk = crc ? crctable[chk >> 8] ^ (chk << 8) ^ c : chk + c; }
if(crc)
Cputc(chk >> 8);
Cputc(chk);
for(;;) switch(get_char(1)) {
case -1 : return TIMEOUT;
case -2 :
case CAN : return ABORT;
case NAK : return RNAK;
case ACK : return TX;
case 'C' :
if(!block_num) {
crc = -1;