82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include <jansson.h>
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#include "receive.h"
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#include "send.h"
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#include "json.h"
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static void json_serialize_to_buf(json_t *obj, struct buf *buf) {
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assert(json_dump_callback(obj, json_buf_append_callback, buf, 0) == 0);
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json_decref(obj);
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buf_chr(buf, buf->length++) = '\n';
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}
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static void json_hello(struct buf *buf) {
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json_t *hello = json_pack("{sIsIsI}",
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"mlat_timestamp_mhz", (json_int_t) MLAT_MHZ,
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"mlat_timestamp_max", (json_int_t) MLAT_MAX,
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"rssi_max", (json_int_t) RSSI_MAX);
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json_serialize_to_buf(hello, buf);
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}
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static void json_add_common(struct packet *packet, json_t *obj) {
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json_object_set_new(obj, "type", json_string(packet_type_names[packet->type]));
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if (packet->mlat_timestamp) {
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json_object_set_new(obj, "mlat_timestamp", json_integer(packet->mlat_timestamp));
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}
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if (packet->rssi) {
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json_object_set_new(obj, "rssi", json_integer(packet->rssi));
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}
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}
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static void json_serialize_mode_s_short(struct packet *packet, struct buf *buf) {
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assert(packet->mlat_timestamp < MLAT_MAX);
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char hexbuf[14];
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hex_from_bin(hexbuf, packet->payload, 7);
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json_t *out = json_pack("{ss#}", "payload", hexbuf, 14);
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json_add_common(packet, out);
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json_serialize_to_buf(out, buf);
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}
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static void json_serialize_mode_s_long(struct packet *packet, struct buf *buf) {
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assert(packet->mlat_timestamp < MLAT_MAX);
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char hexbuf[28];
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hex_from_bin(hexbuf, packet->payload, 14);
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json_t *out = json_pack("{ss#}", "payload", hexbuf, 28);
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json_add_common(packet, out);
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json_serialize_to_buf(out, buf);
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}
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void json_init() {
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assert(JSON_INTEGER_IS_LONG_LONG);
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}
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void json_serialize(struct packet *packet, struct buf *buf) {
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if (!packet) {
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json_hello(buf);
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return;
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}
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switch (packet->type) {
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case MODE_S_SHORT:
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json_serialize_mode_s_short(packet, buf);
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break;
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case MODE_S_LONG:
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json_serialize_mode_s_long(packet, buf);
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break;
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}
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}
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int json_buf_append_callback(const char *buffer, size_t size, void *data) {
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struct buf *buf = data;
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if (buf->length + size + 1 > BUF_LEN_MAX) {
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return -1;
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}
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memcpy(buf_at(buf, buf->length), buffer, size);
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buf->length += size;
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return 0;
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}
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