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/****************************************************************************
NAME
rtcm2_json.c - deserialize RTCM2 JSON
DESCRIPTION
This module uses the generic JSON parser to get data from RTCM2
representations to libgps structures.
PERMISSIONS
This file is Copyright (c) 2010-2018 by the GPSD project
SPDX-License-Identifier: BSD-2-clause
***************************************************************************/
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <stddef.h>
#include "gpsd.h"
#ifdef SOCKET_EXPORT_ENABLE
#include "gps_json.h"
/* common fields in every RTCM2 message */
int json_rtcm2_read(const char *buf,
char *path, size_t pathlen, struct rtcm2_t *rtcm2,
const char **endptr)
{
static char *stringptrs[NITEMS(rtcm2->words)];
static char stringstore[sizeof(rtcm2->words) * 2];
static int stringcount;
/* *INDENT-OFF* */
#define RTCM2_HEADER \
{"class", t_check, .dflt.check = "RTCM2"}, \
{"type", t_uinteger, .addr.uinteger = &rtcm2->type}, \
{"device", t_string, .addr.string = path, \
.len = pathlen}, \
{"station_id", t_uinteger, .addr.uinteger = &rtcm2->refstaid}, \
{"zcount", t_real, .addr.real = &rtcm2->zcount, \
.dflt.real = NAN}, \
{"seqnum", t_uinteger, .addr.uinteger = &rtcm2->seqnum}, \
{"length", t_uinteger, .addr.uinteger = &rtcm2->length}, \
{"station_health", t_uinteger, .addr.uinteger = &rtcm2->stathlth},
int status = 0, satcount = 0;
const struct json_attr_t rtcm1_satellite[] = {
{"ident", t_uinteger, STRUCTOBJECT(struct gps_rangesat_t, ident)},
{"udre", t_uinteger, STRUCTOBJECT(struct gps_rangesat_t, udre)},
{"iod", t_uinteger, STRUCTOBJECT(struct gps_rangesat_t, iod)},
{"prc", t_real, STRUCTOBJECT(struct gps_rangesat_t, prc)},
{"rrc", t_real, STRUCTOBJECT(struct gps_rangesat_t, rrc)},
{NULL},
};
const struct json_attr_t json_rtcm1[] = {
RTCM2_HEADER
{"satellites", t_array, STRUCTARRAY(rtcm2->gps_ranges.sat,
rtcm1_satellite, &satcount)},
{NULL},
};
const struct json_attr_t json_rtcm3[] = {
RTCM2_HEADER
{"x", t_real, .addr.real = &rtcm2->ecef.x,
.dflt.real = NAN},
{"y", t_real, .addr.real = &rtcm2->ecef.y,
.dflt.real = NAN},
{"z", t_real, .addr.real = &rtcm2->ecef.z,
.dflt.real = NAN},
{NULL},
};
/*
* Beware! Needs to stay synchronized with a corresponding
* name array in the RTCM2 JSON dump code. This interpretation of
* NAVSYSTEM_GALILEO is assumed from RTCM3, it's not actually
* documented in RTCM 2.1.
*/
const struct json_enum_t system_table[] = {
{"GPS", 0}, {"GLONASS", 1}, {"GALILEO", 2}, {"UNKNOWN", 3}, {NULL}
};
const struct json_attr_t json_rtcm4[] = {
RTCM2_HEADER
{"valid", t_boolean, .addr.boolean = &rtcm2->reference.valid},
{"system", t_integer, .addr.integer = &rtcm2->reference.system,
.map=system_table},
{"sense", t_integer, .addr.integer = &rtcm2->reference.sense},
{"datum", t_string, .addr.string = rtcm2->reference.datum,
.len = sizeof(rtcm2->reference.datum)},
{"dx", t_real, .addr.real = &rtcm2->reference.dx,
.dflt.real = NAN},
{"dy", t_real, .addr.real = &rtcm2->reference.dy,
.dflt.real = NAN},
{"dz", t_real, .addr.real = &rtcm2->reference.dz,
.dflt.real = NAN},
{NULL},
};
const struct json_attr_t rtcm5_satellite[] = {
{"ident", t_uinteger, STRUCTOBJECT(struct consat_t, ident)},
{"iodl", t_boolean, STRUCTOBJECT(struct consat_t, iodl)},
{"health", t_uinteger, STRUCTOBJECT(struct consat_t, health)},
{"snr", t_integer, STRUCTOBJECT(struct consat_t, snr)},
{"health_en", t_boolean, STRUCTOBJECT(struct consat_t, health_en)},
{"new_data", t_boolean, STRUCTOBJECT(struct consat_t, new_data)},
{"los_warning", t_boolean, STRUCTOBJECT(struct consat_t, los_warning)},
{"tou", t_uinteger, STRUCTOBJECT(struct consat_t, tou)},
{NULL},
};
const struct json_attr_t json_rtcm5[] = {
RTCM2_HEADER
{"satellites", t_array, STRUCTARRAY(rtcm2->conhealth.sat,
rtcm5_satellite, &satcount)},
{NULL},
};
const struct json_attr_t json_rtcm6[] = {
RTCM2_HEADER
// No-op or keepalive message
{NULL},
};
const struct json_attr_t rtcm7_satellite[] = {
{"lat", t_real, STRUCTOBJECT(struct station_t, latitude)},
{"lon", t_real, STRUCTOBJECT(struct station_t, longitude)},
{"range", t_uinteger, STRUCTOBJECT(struct station_t, range)},
{"frequency", t_real, STRUCTOBJECT(struct station_t, frequency)},
{"health", t_uinteger, STRUCTOBJECT(struct station_t, health)},
{"station_id", t_uinteger, STRUCTOBJECT(struct station_t, station_id)},
{"bitrate", t_uinteger, STRUCTOBJECT(struct station_t, bitrate)},
{NULL},
};
const struct json_attr_t json_rtcm7[] = {
RTCM2_HEADER
{"satellites", t_array, STRUCTARRAY(rtcm2->almanac.station,
rtcm7_satellite, &satcount)},
{NULL},
};
const struct json_attr_t json_rtcm13[] = {
RTCM2_HEADER
{"status", t_boolean, .addr.boolean = &rtcm2->xmitter.status},
{"rangeflag", t_boolean, .addr.boolean = &rtcm2->xmitter.rangeflag},
{"lat", t_real, .addr.real = &rtcm2->xmitter.lat,
.dflt.real = NAN},
{"lon", t_real, .addr.real = &rtcm2->xmitter.lon,
.dflt.real = NAN},
{"range", t_uinteger, .addr.uinteger = &rtcm2->xmitter.range},
{NULL},
};
const struct json_attr_t json_rtcm14[] = {
RTCM2_HEADER
{"week", t_uinteger, .addr.uinteger = &rtcm2->gpstime.week},
{"hour", t_uinteger, .addr.uinteger = &rtcm2->gpstime.hour},
{"leapsecs", t_uinteger, .addr.uinteger = &rtcm2->gpstime.leapsecs},
{NULL},
};
const struct json_attr_t json_rtcm16[] = {
RTCM2_HEADER
{"message", t_string, .addr.string = rtcm2->message,
.len = sizeof(rtcm2->message)},
{NULL},
};
const struct json_attr_t rtcm31_satellite[] = {
{"ident", t_uinteger, STRUCTOBJECT(struct glonass_rangesat_t, ident)},
{"udre", t_uinteger, STRUCTOBJECT(struct glonass_rangesat_t, udre)},
{"change", t_boolean, STRUCTOBJECT(struct glonass_rangesat_t, change)},
{"tod", t_uinteger, STRUCTOBJECT(struct glonass_rangesat_t, tod)},
{"prc", t_real, STRUCTOBJECT(struct glonass_rangesat_t, prc)},
{"rrc", t_real, STRUCTOBJECT(struct glonass_rangesat_t, rrc)},
{NULL},
};
const struct json_attr_t json_rtcm31[] = {
RTCM2_HEADER
{"satellites", t_array, STRUCTARRAY(rtcm2->glonass_ranges.sat,
rtcm31_satellite, &satcount)},
{NULL},
};
const struct json_attr_t json_rtcm2_fallback[] = {
RTCM2_HEADER
{"data", t_array, .addr.array.element_type = t_string,
.addr.array.arr.strings.ptrs = stringptrs,
.addr.array.arr.strings.store = stringstore,
.addr.array.arr.strings.storelen = sizeof(stringstore),
.addr.array.count = &stringcount,
.addr.array.maxlen = NITEMS(stringptrs)},
{NULL},
};
#undef RTCM2_HEADER
/* *INDENT-ON* */
memset(rtcm2, '\0', sizeof(struct rtcm2_t));
if (strstr(buf, "\"type\":1,") != NULL
|| strstr(buf, "\"type\":9,") != NULL) {
status = json_read_object(buf, json_rtcm1, endptr);
if (status == 0)
rtcm2->gps_ranges.nentries = (unsigned)satcount;
} else if (strstr(buf, "\"type\":3,") != NULL) {
status = json_read_object(buf, json_rtcm3, endptr);
if (status == 0) {
rtcm2->ecef.valid = (isfinite(rtcm2->ecef.x) != 0)
&& (isfinite(rtcm2->ecef.y) != 0)
&& (isfinite(rtcm2->ecef.z) != 0);
}
} else if (strstr(buf, "\"type\":4,") != NULL) {
status = json_read_object(buf, json_rtcm4, endptr);
if (status == 0)
rtcm2->reference.valid = (isfinite(rtcm2->reference.dx) != 0)
&& (isfinite(rtcm2->reference.dy) != 0)
&& (isfinite(rtcm2->reference.dz) != 0);
} else if (strstr(buf, "\"type\":5,") != NULL) {
status = json_read_object(buf, json_rtcm5, endptr);
if (status == 0)
rtcm2->conhealth.nentries = (unsigned)satcount;
} else if (strstr(buf, "\"type\":6,") != NULL) {
status = json_read_object(buf, json_rtcm6, endptr);
} else if (strstr(buf, "\"type\":7,") != NULL) {
status = json_read_object(buf, json_rtcm7, endptr);
if (status == 0)
rtcm2->almanac.nentries = (unsigned)satcount;
} else if (strstr(buf, "\"type\":13,") != NULL) {
status = json_read_object(buf, json_rtcm13, endptr);
} else if (strstr(buf, "\"type\":14,") != NULL) {
status = json_read_object(buf, json_rtcm14, endptr);
} else if (strstr(buf, "\"type\":16,") != NULL) {
status = json_read_object(buf, json_rtcm16, endptr);
} else if (strstr(buf, "\"type\":31,") != NULL) {
status = json_read_object(buf, json_rtcm31, endptr);
if (status == 0)
rtcm2->glonass_ranges.nentries = (unsigned)satcount;
} else {
int n;
status = json_read_object(buf, json_rtcm2_fallback, endptr);
for (n = 0; n < NITEMS(rtcm2->words); n++) {
if (n >= stringcount) {
rtcm2->words[n] = 0;
} else {
unsigned int u;
int fldcount = sscanf(stringptrs[n], "0x%08x\n", &u);
if (fldcount != 1)
return JSON_ERR_MISC;
else
rtcm2->words[n] = (isgps30bits_t) u;
}
}
}
return status;
}
#endif /* SOCKET_EXPORT_ENABLE */
/* rtcm2_json.c ends here */
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