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p25_lcw.c
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p25_lcw.c
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#include <stdint.h>
#include <stdio.h>
static char *lcwids[19] = {
"Group Voice Channel User",
"Unknown (1)",
"Group Voice Channel Update",
"Unit to Unit Voice Channel User",
"Group Voice Channel Update - Explicit",
"Unit to Unit Answer Request",
"Telephone Interconnect Voice Channel User",
"Telephone Interconnect Answer Request",
"Call Termination/Cancellation", // +7
"Group Affiliation Query",
"Unit Registration Command",
"Unknown (18)",
"Status Query",
"Status Update",
"Message Update",
"Call Alert",
"Extended Function Command",
"Channel Identifier Update",
"Channel Identifier Update - Explicit",
};
unsigned int decode_p25_lcf(unsigned int lcinfo[3], char *strbuf)
{
unsigned char lcformat = (lcinfo[0] & 0xFF);
unsigned int channel = 0;
unsigned int len = 0;
lcinfo[0] >>= 8;
if (lcformat == 0) {
len = snprintf (strbuf, 1023, "LCW: Group Voice Ch User%s, talkgroup: %u, radio id: %u (session mode: %s)\n",
((lcinfo[1] & 0x00800000) ? " Emergency" : ""), (lcinfo[1] & 0xffff), lcinfo[2],
((lcinfo[1] & 0x00100000) ? "Circuit" : "Packet"));
} else if (lcformat == 1) {
len = snprintf (strbuf, 1023, "LCW: Reserved (1)\n");
} else if (lcformat == 2) {
channel = (((lcinfo[1] & 0x0f) << 16) | (lcinfo[2] >> 16));
len = snprintf (strbuf, 1023, "LCW: Group Voice Ch Update, Channel A: 0x%02x/0x%06x, Group Address A: 0x%04x",
((lcinfo[0] >> 12) & 0x0f), (lcinfo[0] & 0x0fff), (lcinfo[1] >> 8));
if (channel) {
len += snprintf (strbuf+len, 1023-len, " Channel A: 0x%02x/0x%06x, Group Address A: 0x%04x",
((lcinfo[1] >> 4) & 0x0f), channel, (lcinfo[2] & 0xffff));
}
strbuf[len++] = '\n';
} else if (lcformat == 3) {
len = snprintf (strbuf, 1023, "LCW: Unit-to-Unit Voice Ch Update, from %u to %u\n", lcinfo[2], lcinfo[1]);
} else if (lcformat == 4) {
channel = (((lcinfo[1] & 0x0f) << 16) | (lcinfo[2] >> 16));
len = snprintf (strbuf, 1023, "LCW: Group Voice Ch Update (Explicit), Group Address: 0x%04x, TX Channel: 0x%02x/0x%06x, RX Channel: 0x%02x/0x%06x\n",
(lcinfo[1] >> 8), ((lcinfo[1] >> 4) & 0x0f), channel, ((lcinfo[2] >> 12) & 0x0f), (lcinfo[2] & 0x0fff));
} else if (lcformat == 5) {
len = snprintf (strbuf, 1023, "LCW: Unit-to-Unit Answer Request, from %u to %u\n", lcinfo[2], lcinfo[1]);
} else if (lcformat == 6) {
channel = ((lcinfo[1] & 0xff) / 10);
len = snprintf (strbuf, 1023, "LCW: Telephone Interconnect Voice Ch User %s, address: %u, timer: %u secs\n",
((lcinfo[1] & 0x00800000) ? "Emergency" : ""), lcinfo[2], channel);
} else if (lcformat == 7) {
len = snprintf (strbuf, 1023, "LCW: Telephone Interconnect Answer Request, (%u%u%u) %u%u%u-%u%u%u%u to %u\n",
((lcinfo[0] >> 12) & 0x0f), ((lcinfo[0] >> 8) & 0x0f), ((lcinfo[0] >> 4) & 0x0f), ((lcinfo[0] >> 0) & 0x0f),
((lcinfo[1] >> 20) & 0x0f), ((lcinfo[1] >> 16) & 0x0f), ((lcinfo[1] >> 12) & 0x0f),
((lcinfo[1] >> 8) & 0x0f), ((lcinfo[1] >> 4) & 0x0f), ((lcinfo[1] >> 0) & 0x0f),
lcinfo[2]);
} else if (lcformat == 15) {
len = snprintf (strbuf, 1023, "LCW: Call Termination or Cancellation, radio id: %u\n", lcinfo[2]);
} else if (lcformat == 16) {
len = snprintf (strbuf, 1023, "LCW: Group Affiliation Query, from %u to %u\n", lcinfo[2], lcinfo[1]);
} else if (lcformat == 17) {
len = snprintf (strbuf, 1023, "LCW: Unit Registration, unit %u registering on system %u, network %u\n",
lcinfo[2], (lcinfo[1] & 0x0fff), (((lcinfo[0] & 0xff) << 12) | (lcinfo[1] >> 12)));
} else if (lcformat == 19) {
len = snprintf (strbuf, 1023, "LCW: Status Query, from %u to %u\n", lcinfo[2], lcinfo[1]);
} else if (lcformat == 20) {
len = snprintf (strbuf, 1023, "LCW: Status Update, from %u to %u: User Status: 0x%02x, Unit Status: 0x%02x\n",
lcinfo[2], lcinfo[1], ((lcinfo[0] >> 8) & 0xff), (lcinfo[0] & 0xff));
} else if (lcformat == 21) {
len = snprintf (strbuf, 1023, "LCW: Message Update: 0x%04x (talkgroup: %u, radio_id: %u)\n",
(lcinfo[0] & 0xffff), lcinfo[1], lcinfo[2]);
} else if (lcformat == 22) {
len = snprintf (strbuf, 1023, "LCW: Call Alert, from %u to %u\n", lcinfo[2], lcinfo[1]);
} else if (lcformat == 23) {
unsigned int extended_function_command = (lcinfo[0] & 0xffff);
len = snprintf (strbuf, 1023, "LCW: Extended Function 0x%04x, arg: 0x%06x, target: %u\n",
extended_function_command, lcinfo[1], lcinfo[2]);
} else if (lcformat == 24) {
long offset = 250000L * (((lcinfo[0] << 6) & 0x07) | (lcinfo[1] >> 18));
unsigned long base_freq = 5 * (((lcinfo[1] & 0xff) << 24UL) | lcinfo[2]);
len = snprintf (strbuf, 1023, "LCW: Channel Identifier Update: Id: %u, Frequency: %lu%ld, Bandwidth: %ukHz, Channel Spacing: %ukHz\n",
((lcinfo[0] >> 12) & 0x0f), base_freq, -offset, (((lcinfo[0] >> 3) & 0x1ff) >> 3), ((lcinfo[1] >> 8) & 0x3ff));
} else if (lcformat == 25) {
long offset = 250000LL * (((lcinfo[0] << 6) & 0x3fff) | (lcinfo[1] >> 18));
unsigned long base_freq = 5LL * (((lcinfo[1] & 0xff) << 24UL) | lcinfo[2]);
len = snprintf (strbuf, 1023, "LCW: Channel Identifier Update Explicit: Id: %u, Frequency: %lu%ld, Bandwidth: %ukHz, Channel Spacing: %ukHz\n",
((lcinfo[0] >> 12) & 0x0f), base_freq, -offset, (((lcinfo[0] >> 8) & 0x0f) >> 3), ((lcinfo[1] >> 8) & 0x3ff));
} else {
len = snprintf (strbuf, 1023, "LCW: Unknown (lcformat: 0x%02x), hexdump: 0x%04x, 0x%06x, 0x%06x\n",
lcformat, lcinfo[0], lcinfo[1], lcinfo[2]);
}
return len;
}