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/****************************************************************************
NAME
libgps_json.c - deserialize gpsd data coming from the server
DESCRIPTION
This module uses the generic JSON parser to get data from JSON
representations to libgps structures.
***************************************************************************/
#include <math.h>
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include "gpsd_config.h"
#include "gpsd.h"
#include "gps_json.h"
static int json_tpv_read(const char *buf,
struct gps_data_t *gpsdata, const char **endptr)
{
int status;
const struct json_attr_t json_attrs_1[] = {
{"class", check, .dflt.check = "TPV"},
{"device", string, .addr.string.ptr = gpsdata->gps_device,
.addr.string.len = sizeof(gpsdata->gps_device)},
{"tag", string, .addr.string.ptr = gpsdata->tag,
.addr.string.len = sizeof(gpsdata->tag)},
{"time", real, .addr.real = &gpsdata->fix.time,
.dflt.real = NAN},
{"ept", real, .addr.real = &gpsdata->fix.ept,
.dflt.real = NAN},
{"lon", real, .addr.real = &gpsdata->fix.longitude,
.dflt.real = NAN},
{"lat", real, .addr.real = &gpsdata->fix.latitude,
.dflt.real = NAN},
{"alt", real, .addr.real = &gpsdata->fix.altitude,
.dflt.real = NAN},
{"eph", real, .addr.real = &gpsdata->fix.eph,
.dflt.real = NAN},
{"epv", real, .addr.real = &gpsdata->fix.epv,
.dflt.real = NAN},
{"track", real, .addr.real = &gpsdata->fix.track,
.dflt.real = NAN},
{"speed", real, .addr.real = &gpsdata->fix.speed,
.dflt.real = NAN},
{"climb", real, .addr.real = &gpsdata->fix.climb,
.dflt.real = NAN},
{"epd", real, .addr.real = &gpsdata->fix.epd,
.dflt.real = NAN},
{"eps", real, .addr.real = &gpsdata->fix.eps,
.dflt.real = NAN},
{"epc", real, .addr.real = &gpsdata->fix.epc,
.dflt.real = NAN},
{"mode", integer, .addr.integer = &gpsdata->fix.mode,
.dflt.integer = MODE_NOT_SEEN},
{NULL},
};
status = json_read_object(buf, json_attrs_1, endptr);
if (status == 0) {
gpsdata->status = STATUS_FIX;
gpsdata->set = STATUS_SET;
if (isnan(gpsdata->fix.time) == 0)
gpsdata->set |= TIME_SET;
if (isnan(gpsdata->fix.ept) == 0)
gpsdata->set |= TIMERR_SET;
if (isnan(gpsdata->fix.longitude) == 0)
gpsdata->set |= LATLON_SET;
if (isnan(gpsdata->fix.altitude) == 0)
gpsdata->set |= ALTITUDE_SET;
if (isnan(gpsdata->fix.eph)==0)
gpsdata->set |= HERR_SET;
if (isnan(gpsdata->fix.epv)==0)
gpsdata->set |= VERR_SET;
if (isnan(gpsdata->fix.track)==0)
gpsdata->set |= TRACK_SET;
if (isnan(gpsdata->fix.speed)==0)
gpsdata->set |= SPEED_SET;
if (isnan(gpsdata->fix.climb)==0)
gpsdata->set |= CLIMB_SET;
if (isnan(gpsdata->fix.epd)==0)
gpsdata->set |= TRACKERR_SET;
if (isnan(gpsdata->fix.eps)==0)
gpsdata->set |= SPEEDERR_SET;
if (isnan(gpsdata->fix.epc)==0)
gpsdata->set |= CLIMBERR_SET;
if (isnan(gpsdata->fix.epc)==0)
gpsdata->set |= CLIMBERR_SET;
if (gpsdata->fix.mode != MODE_NOT_SEEN)
gpsdata->set |= MODE_SET;
}
return status;
}
static int json_sky_read(const char *buf,
struct gps_data_t *gpsdata, const char **endptr)
{
bool usedflags[MAXCHANNELS];
const struct json_attr_t json_attrs_2_1[] = {
{"PRN", integer, .addr.integer = gpsdata->PRN},
{"el", integer, .addr.integer = gpsdata->elevation},
{"az", integer, .addr.integer = gpsdata->azimuth},
{"ss", real, .addr.real = gpsdata->ss},
{"used", boolean, .addr.boolean = usedflags},
{NULL},
};
const struct json_attr_t json_attrs_2[] = {
{"class", check, .dflt.check = "SKY"},
{"device", string, .addr.string.ptr = gpsdata->gps_device,
.addr.string.len = PATH_MAX},
{"tag", string, .addr.string.ptr = gpsdata->tag,
.addr.string.len = MAXTAGLEN},
{"time", real, .addr.real = &gpsdata->fix.time},
{"reported", integer, .addr.integer = &gpsdata->satellites_used},
{"satellites", array, .addr.array.element_type = object,
.addr.array.arr.subtype = json_attrs_2_1,
.addr.array.maxlen = MAXCHANNELS},
{NULL},
};
int status, i, j;
for (i = 0; i < MAXCHANNELS; i++)
usedflags[i] = false;
status = json_read_object(buf, json_attrs_2, endptr);
if (status != 0)
return status;
for (i = j = 0; i < MAXCHANNELS; i++) {
if (usedflags[i]) {
gpsdata->used[j++] = gpsdata->PRN[i];
}
}
gpsdata->set |= SATELLITE_SET;
return 0;
}
static int json_device_read(const char *buf,
struct device_t *dev, const char **endptr)
{
const struct json_enum_t datatype_map[] = {
{"GPS", DEV_GPS},
{"RTCM2", DEV_RTCM2},
{"RTCM3", DEV_RTCM3},
{"AIS", DEV_AIS},
};
const struct json_attr_t json_attrs_device[] = {
{"class", check, .dflt.check = "DEVICE"},
{"path", string, .addr.string.ptr = dev->path,
.addr.string.len = sizeof(dev->path)},
{"activated", real, .addr.real = &dev->activated},
{"type", array, .addr.array.element_type = flags,
.addr.array.arr.flags.map = datatype_map,
.addr.array.arr.flags.bits=&dev->datatypes},
{"driver", string, .addr.string.ptr = dev->driver,
.addr.string.len = sizeof(dev->driver)},
{"subtype", string, .addr.string.ptr = dev->subtype,
.addr.string.len = sizeof(dev->subtype)},
{NULL},
};
int status;
status = json_read_object(buf, json_attrs_device, endptr);
if (status != 0)
return status;
return 0;
}
#ifdef __UNUSED_
static int json_devicelist_read(const char *buf,
struct gps_data_t *gpsdata, const char **endptr)
{
char names[GPS_JSON_DEVICES_MAX][PATH_MAX];
const struct json_attr_t json_attrs_subdevices[] = {
// FIXME: Parse device records, too.
{"name", string, .addr.string.ptr = gpsdata->gps_device,
.addr.string.len = sizeof(gpsdata->gps_device)},
{NULL},
};
const struct json_attr_t json_attrs_devices[] = {
{"class", check, .dflt.check = "DEVICES"},
{"devices", array, .addr.array.element_type = object,
.addr.array.arr.subtype = json_attrs_subdevices,
.addr.array.maxlen = MAXDEVICES_PER_USER},
{NULL},
};
int status;
status = json_read_object(buf, json_attrs_devices, endptr);
if (status != 0)
return status;
gpsdata->devices.time = timestamp();
gpsdata->set |= DEVICELIST_SET;
gpsdata->devices.ndevices = *json_attrs_devices[0].addr.array.count;
return 0;
}
#endif
int libgps_json_unpack(const char *buf, struct gps_data_t *gpsdata)
/* the only entry point - unpack a JSON object into C structs */
{
if (strstr(buf, "\"class\":\"TPV\"") != 0) {
return json_tpv_read(buf, gpsdata, NULL);
} else if (strstr(buf, "\"class\":\"SKY\"") != 0) {
return json_sky_read(buf, gpsdata, NULL);
} else if (strstr(buf, "\"class\":\"DEVICE\"") != 0) {
int status = json_device_read(buf, &gpsdata->devices.list[0], NULL);
if (status == 0)
gpsdata->set |= DEVICE_SET;
return status;
} else
return -1;
}
/* libgps_json.c ends here */
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