static void x25_asy_unesc(struct x25_asy *sl, unsigned char s)
{
switch (s) {
case X25_END:
if (!test_and_clear_bit(SLF_ERROR, &sl->flags) &&
sl->rcount > 2)
x25_asy_bump(sl);
clear_bit(SLF_ESCAPE, &sl->flags);
sl->rcount = 0;
return;
case X25_ESC:
set_bit(SLF_ESCAPE, &sl->flags);
return;
case X25_ESCAPE(X25_ESC):
case X25_ESCAPE(X25_END):
if (test_and_clear_bit(SLF_ESCAPE, &sl->flags))
s = X25_UNESCAPE(s);
break;
}
if (!test_bit(SLF_ERROR, &sl->flags)) {
if (sl->rcount < sl->buffsize) {
sl->rbuff[sl->rcount++] = s;
return;
}
sl->dev->stats.rx_over_errors++;
set_bit(SLF_ERROR, &sl->flags);
}
}
int x25_asy_esc(unsigned char *s, unsigned char *d, int len)
{
unsigned char *ptr = d;
unsigned char c;
/*
* Send an initial END character to flush out any
* data that may have accumulated in the receiver
* due to line noise.
*/
*ptr++ = X25_END; /* Send 10111110 bit seq */
/*
* For each byte in the packet, send the appropriate
* character sequence, according to the X.25 protocol.
*/
while (len-- > 0)
{
switch(c = *s++)
{
case X25_END:
*ptr++ = X25_ESC;
*ptr++ = X25_ESCAPE(X25_END);
break;
case X25_ESC:
*ptr++ = X25_ESC;
*ptr++ = X25_ESCAPE(X25_ESC);
break;
default:
*ptr++ = c;
break;
}
}
*ptr++ = X25_END;
return (ptr - d);
}
static int x25_asy_esc(unsigned char *s, unsigned char *d, int len)
{
unsigned char *ptr = d;
unsigned char c;
/*
*/
*ptr++ = X25_END; /* */
/*
*/
while (len-- > 0) {
switch (c = *s++) {
case X25_END:
*ptr++ = X25_ESC;
*ptr++ = X25_ESCAPE(X25_END);
break;
case X25_ESC:
*ptr++ = X25_ESC;
*ptr++ = X25_ESCAPE(X25_ESC);
break;
default:
*ptr++ = c;
break;
}
}
*ptr++ = X25_END;
return ptr - d;
}
