85 lines
2.2 KiB
C
85 lines
2.2 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 "backend.h"
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#include "client.h"
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#include "json.h"
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// Hobo JSON to avoid overhead. Assumes that we can't get quotes in the data.
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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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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 (size > BUF_LEN_MAX - buf->length - 1) {
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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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static void json_hello(struct buf *buf) {
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json_t *hello = json_pack("{sssIsIsI}",
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"server_id", server_id,
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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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assert(json_dump_callback(hello, json_buf_append_callback, buf, 0) == 0);
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json_decref(hello);
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buf_chr(buf, buf->length++) = '\n';
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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("{ssss#sIsI}",
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"backend_id", packet->backend->id,
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"payload", hexbuf, 14,
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"mlat_timestamp", (json_int_t) packet->mlat_timestamp,
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"rssi", (json_int_t) packet->rssi);
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assert(json_dump_callback(out, json_buf_append_callback, buf, 0) == 0);
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json_decref(out);
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buf_chr(buf, buf->length++) = '\n';
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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[14];
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hex_from_bin(hexbuf, packet->payload, 14);
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json_t *out = json_pack("{ssss#sIsI}",
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"backend_id", packet->backend->id,
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"payload", hexbuf, 28,
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"mlat_timestamp", (json_int_t) packet->mlat_timestamp,
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"rssi", (json_int_t) packet->rssi);
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assert(json_dump_callback(out, json_buf_append_callback, buf, 0) == 0);
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json_decref(out);
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buf_chr(buf, buf->length++) = '\n';
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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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case NUM_TYPES:
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break;
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}
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}
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