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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.
***************************************************************************/
#include <math.h>
#include <assert.h>
#include <string.h>
#include <stddef.h>
#include <stdio.h>
#include "gpsd_config.h"
#include "gpsd.h"
#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;
#define RTCM2_HEADER \
{"class", check, .dflt.check = "RTCM2"}, \
{"type", uinteger, .addr.uinteger = &rtcm2->type}, \
{"device", string, .addr.string = path, \
.len = pathlen}, \
{"station_id", uinteger, .addr.uinteger = &rtcm2->refstaid}, \
{"zcount", real, .addr.real = &rtcm2->zcount, \
.dflt.real = NAN}, \
{"seqnum", uinteger, .addr.uinteger = &rtcm2->seqnum}, \
{"length", uinteger, .addr.uinteger = &rtcm2->length}, \
{"station_health", uinteger, .addr.uinteger = &rtcm2->stathlth},
int status, satcount;
const struct json_attr_t rtcm1_satellite[] = {
{"ident", uinteger, STRUCTOBJECT(struct rangesat_t, ident)},
{"udre", uinteger, STRUCTOBJECT(struct rangesat_t, udre)},
{"issuedata", uinteger, STRUCTOBJECT(struct rangesat_t, issuedata)},
{"rangerr", real, STRUCTOBJECT(struct rangesat_t, rangerr)},
{"rangerate", real, STRUCTOBJECT(struct rangesat_t, rangerate)},
{NULL},
};
const struct json_attr_t json_rtcm1[] = {
RTCM2_HEADER
{"satellites", array, STRUCTARRAY(rtcm2->ranges.sat,
rtcm1_satellite, &satcount)},
{NULL},
};
const struct json_attr_t json_rtcm3[] = {
RTCM2_HEADER
{"x", real, .addr.real = &rtcm2->ecef.x,
.dflt.real = NAN},
{"y", real, .addr.real = &rtcm2->ecef.y,
.dflt.real = NAN},
{"z", real, .addr.real = &rtcm2->ecef.z,
.dflt.real = NAN},
{NULL},
};
/*
* Beware! Needs to stay synchronized with a corresponding
* nam,e 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", 2}, {NULL}
};
const struct json_attr_t json_rtcm4[] = {
RTCM2_HEADER
{"valid", boolean, .addr.boolean = &rtcm2->reference.valid},
{"system", integer, .addr.integer = &rtcm2->reference.system,
.map=system_table},
{"sense", integer, .addr.integer = &rtcm2->reference.sense},
{"datum", string, .addr.string = rtcm2->reference.datum,
.len = sizeof(rtcm2->reference.datum)},
{"dx", real, .addr.real = &rtcm2->reference.dx,
.dflt.real = NAN},
{"dy", real, .addr.real = &rtcm2->reference.dy,
.dflt.real = NAN},
{"dz", real, .addr.real = &rtcm2->reference.dz,
.dflt.real = NAN},
{NULL},
};
const struct json_attr_t rtcm5_satellite[] = {
{"ident", uinteger, STRUCTOBJECT(struct consat_t, ident)},
{"iodl", boolean, STRUCTOBJECT(struct consat_t, iodl)},
{"health", uinteger, STRUCTOBJECT(struct consat_t, health)},
{"snr", integer, STRUCTOBJECT(struct consat_t, snr)},
{"health_en", boolean, STRUCTOBJECT(struct consat_t, health_en)},
{"new_data", boolean, STRUCTOBJECT(struct consat_t, new_data)},
{"los_warning", boolean, STRUCTOBJECT(struct consat_t, los_warning)},
{"tou", uinteger, STRUCTOBJECT(struct consat_t, tou)},
{NULL},
};
const struct json_attr_t json_rtcm5[] = {
RTCM2_HEADER
{"satellites", 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[] = {
{"latitude", real, STRUCTOBJECT(struct station_t, latitude)},
{"longitude", real, STRUCTOBJECT(struct station_t, longitude)},
{"range", uinteger, STRUCTOBJECT(struct station_t, range)},
{"frequency", real, STRUCTOBJECT(struct station_t, frequency)},
{"health", uinteger, STRUCTOBJECT(struct station_t, health)},
{"station_id", uinteger, STRUCTOBJECT(struct station_t, station_id)},
{"bitrate", uinteger, STRUCTOBJECT(struct station_t, bitrate)},
{NULL},
};
const struct json_attr_t json_rtcm7[] = {
RTCM2_HEADER
{"satellites", array, STRUCTARRAY(rtcm2->almanac.station,
rtcm7_satellite, &satcount)},
{NULL},
};
const struct json_attr_t json_rtcm16[] = {
RTCM2_HEADER
{"message", string, .addr.string = rtcm2->message,
.len = sizeof(rtcm2->message)},
{NULL},
};
const struct json_attr_t json_rtcm2_fallback[] = {
RTCM2_HEADER
{"data", array, .addr.array.element_type = 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 STRUCTARRAY
#undef STRUCTOBJECT
#undef RTCM2_HEADER
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->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 = (isnan(rtcm2->ecef.x)==0)&&(isnan(rtcm2->ecef.y)==0)&&(isnan(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 = (isnan(rtcm2->reference.dx)==0)&&(isnan(rtcm2->reference.dy)==0)&&(isnan(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\":16,") != NULL) {
status = json_read_object(buf, json_rtcm16, endptr);
} 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;
}
/* rtcm2_json.c ends here */
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