/* input gw10 raw message ------------------------------------------------------
* input next gw10 raw message from stream
* args : raw_t *raw IO receiver raw data control struct
* unsigned char data I stream data (1 byte)
* return : status (-1: error message, 0: no message, 1: input observation data,
* 2: input ephemeris, 3: input sbas message,
* 9: input ion/utc parameter)
*
* notes : to specify input options, set raw->opt to the following option
* strings separated by spaces.
*
* -EPHALL : input all ephemerides
*
*-----------------------------------------------------------------------------*/
extern int input_gw10(raw_t *raw, unsigned char data)
{
int stat;
trace(5,"input_gw10: data=%02x\n",data);
raw->buff[raw->nbyte++]=data;
/* synchronize frame */
if (raw->buff[0]!=GW10SYNC) {
raw->nbyte=0;
return 0;
}
if (raw->nbyte>=2&&!(raw->len=msglen(raw->buff[1]))) {
raw->nbyte=0;
return 0;
}
if (raw->nbyte<2||raw->nbyte<raw->len) return 0;
if (!chksum(raw->buff,raw->len)) {
tracet(2,"gw10 message checksum error msg=%d\n",raw->buff[1]);
raw->buff[0]=0;
raw->nbyte=0;
return -1;
}
/* decode gw10 raw message */
stat=decode_gw10(raw);
raw->buff[0]=0;
raw->nbyte=0;
return stat;
}
static void decompress(uint8_t *p, uint16_t m)
{
uint8_t d;
uint16_t l;
/* Walk the table skipping messages */
if (m == 0)
return;
while(--m) {
p = msglen(p, &l);
p += l - 1;
}
p = msglen(p, &l);
/* A 1 byte message means its 0 text chars long */
while(--l) {
d = getb(p++);
if (d < 3)
return;
if (d < 0x5E)
print_char(d + 0x1d);
else
decompress(worddict - 1, d - 0x5d);
}
}
