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#include <u.h>
#include <libc.h>
#include <ctype.h>
enum {
Soh= 0x1,
Stx= 0x2,
Eot= 0x4,
Ack= 0x6,
Nak= 0x15,
Cancel= 0x18,
};
int send(uchar*, int);
int notifyf(void*, char*);
int debug, progress, onek;
void
errorout(int ctl, int bytes)
{
uchar buf[2];
buf[0] = Cancel;
write(1, buf, 1);
fprint(2, "\nxms: gave up after %d bytes\n", bytes);
write(ctl, "rawoff", 6);
exits("cancel");
}
ushort
updcrc(int c, ushort crc)
{
int count;
for (count=8; --count>=0;) {
if (crc & 0x8000) {
crc <<= 1;
crc += (((c<<=1) & 0400) != 0);
crc ^= 0x1021;
}
else {
crc <<= 1;
crc += (((c<<=1) & 0400) != 0);
}
}
return crc;
}
void
main(int argc, char **argv)
{
uchar c;
uchar buf[1024+5];
uchar seqno;
int fd, ctl;
long n;
int sum;
uchar *p;
int bytes;
int crcmode;
ARGBEGIN{
case 'd':
debug = 1;
break;
case 'p':
progress = 1;
break;
case '1':
onek = 1;
break;
}ARGEND
if(argc != 1){
fprint(2, "usage: xms filename\n");
exits("usage");
}
fd = open(argv[0], OREAD);
if(fd < 0){
perror("xms");
exits("open");
}
ctl = open("/dev/consctl", OWRITE);
if(ctl < 0){
perror("xms");
exits("consctl");
}
write(ctl, "rawon", 5);
/* give the other side a 30 seconds to signal ready */
atnotify(notifyf, 1);
alarm(30*1000);
crcmode = 0;
for(;;){
if(read(0, &c, 1) != 1){
fprint(2, "xms: timeout\n");
exits("timeout");
}
c = c & 0x7f;
if(c == Nak)
break;
if(c == 'C') {
if (debug)
fprint(2, "crc mode engaged\n");
crcmode = 1;
break;
}
}
alarm(0);
/* send the file in 128/1024 byte chunks */
for(bytes = 0, seqno = 1; ; bytes += n, seqno++){
n = read(fd, buf+3, onek ? 1024 : 128);
if(n < 0)
exits("read");
if(n == 0)
break;
if(n < (onek ? 1024 : 128))
memset(&buf[n+3], 0, (onek ? 1024 : 128)-n);
buf[0] = onek ? Stx : Soh;
buf[1] = seqno;
buf[2] = 255 - seqno;
/* calculate checksum and stuff into last byte */
if (crcmode) {
unsigned short crc;
crc = 0;
for(p = buf + 3; p < &buf[(onek ? 1024 : 128)+3]; p++)
crc = updcrc(*p, crc);
crc = updcrc(0, crc);
crc = updcrc(0, crc);
buf[(onek ? 1024 : 128) + 3] = crc >> 8;
buf[(onek ? 1024 : 128) + 4] = crc;
}
else {
sum = 0;
for(p = buf + 3; p < &buf[(onek ? 1024 : 128)+3]; p++)
sum += *p;
buf[(onek ? 1024 : 128) + 3] = sum;
}
if(send(buf, (onek ? 1024 : 128) + 4 + crcmode) < 0)
errorout(ctl, bytes);
if (progress && bytes % 10240 == 0)
fprint(2, "%dK\n", bytes / 1024);
}
/* tell other side we're done */
buf[0] = Eot;
if(send(buf, 1) < 0)
errorout(ctl, bytes);
fprint(2, "xms: %d bytes transmitted\n", bytes);
write(ctl, "rawoff", 6);
exits(0);
}
/*
* send a message till it's acked or we give up
*/
int
send(uchar *buf, int len)
{
int tries;
int n;
uchar c;
for(tries = 0;; tries++, sleep(2*1000)){
if(tries == 10)
return -1;
if(write(1, buf, len) != len)
return -1;
alarm(30*1000);
n = read(0, &c, 1);
alarm(0);
if(debug) switch(c){
case Soh:
fprint(2, " Soh");
break;
case Eot:
fprint(2, " Eot");
break;
case Ack:
fprint(2, " Ack");
break;
case Nak:
fprint(2, " Nak");
break;
case Cancel:
fprint(2, "\nremote Cancel\n");
return -1;
default:
if(isprint(c))
fprint(2, "%c", c);
else
fprint(2, " \\0%o", c);
}
c = c & 0x7f;
if(n == 1 && c == Ack)
break;
}
return 0;
}
int
notifyf(void *a, char *msg)
{
USED(a);
if(strcmp(msg, "alarm") == 0)
return 1;
return 0;
}
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