deac
/
osd-contiki
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

oma-lwm2m: Add JSON writer

master-31012017
Joakim Nohlgård 2016-05-04 20:39:08 +02:00
parent 9832b356ba
commit e8edb6b1a0
4 changed files with 230 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
apps/oma-lwm2m/Makefile.oma-lwm2m
View File

@ -1,5 +1,13 @@
oma-lwm2m_src = lwm2m-object.c lwm2m-engine.c \
lwm2m-device.c lwm2m-server.c lwm2m-security.c \
oma-tlv.c oma-tlv-reader.c oma-tlv-writer.c \
lwm2m-plain-text.c
oma-lwm2m_src = \
lwm2m-object.c \
lwm2m-engine.c \
lwm2m-device.c \
lwm2m-server.c \
lwm2m-security.c \
oma-tlv.c \
oma-tlv-reader.c \
oma-tlv-writer.c \
lwm2m-plain-text.c \
lwm2m-json.c \
#
CFLAGS += -DHAVE_OMA_LWM2M=1

5
apps/oma-lwm2m/lwm2m-engine.c
View File

@ -46,6 +46,7 @@
#include "lwm2m-object.h"
#include "lwm2m-device.h"
#include "lwm2m-plain-text.h"
#include "lwm2m-json.h"
#include "rest-engine.h"
#include "er-coap-constants.h"
#include "er-coap-engine.h"
@ -727,6 +728,10 @@ lwm2m_engine_select_writer(lwm2m_context_t *context, unsigned int accept)
case TEXT_PLAIN:
context->writer = &lwm2m_plain_text_writer;
break;
case LWM2M_JSON:
case APPLICATION_JSON:
context->writer = &lwm2m_json_writer;
break;
default:
PRINTF("Unknown Accept type %u, using LWM2M plain text\n", accept);
context->writer = &lwm2m_plain_text_writer;

162
apps/oma-lwm2m/lwm2m-json.c Normal file
View File

@ -0,0 +1,162 @@
/*
* Copyright (c) 2016, Eistec AB.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \addtogroup oma-lwm2m
* @{
*/
/**
* \file
* Implementation of the Contiki OMA LWM2M JSON writer
* \author
* Joakim Nohlgård <joakim.nohlgard@eistec.se>
*/
#include "lwm2m-object.h"
#include "lwm2m-json.h"
#include "lwm2m-plain-text.h"
#include <stdio.h>
#include <stddef.h>
#include <stdint.h>
#include <inttypes.h>
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static size_t
write_boolean(const lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
int value)
{
int len = snprintf((char *)outbuf, outlen, "{\"e\":[{\"n\":\"%u\",\"bv\":%s}]}\n", ctx->resource_id, value ? "true" : "false");
if((len < 0) || (len >= outlen)) {
return 0;
}
return len;
}
/*---------------------------------------------------------------------------*/
static size_t
write_int(const lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
int32_t value)
{
int len = snprintf((char *)outbuf, outlen, "{\"e\":[{\"n\":\"%u\",\"v\":%" PRId32 "}]}\n", ctx->resource_id, value);
if((len < 0) || (len >= outlen)) {
return 0;
}
return len;
}
/*---------------------------------------------------------------------------*/
static size_t
write_float32fix(const lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
int32_t value, int bits)
{
size_t len = 0;
int res;
res = snprintf((char *)outbuf, outlen, "{\"e\":[{\"n\":\"%u\",\"v\":", ctx->resource_id);
if(res <= 0 || res >= outlen) {
return 0;
}
len += res;
outlen -= res;
res = lwm2m_plain_text_write_float32fix(&outbuf[len], outlen, value, bits);
if((res <= 0) || (res >= outlen)) {
return 0;
}
len += res;
outlen -= res;
res = snprintf((char *)&outbuf[len], outlen, "}]}\n");
if((res <= 0) || (res >= outlen)) {
return 0;
}
len += res;
return len;
}
/*---------------------------------------------------------------------------*/
static size_t
write_string(const lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
const char *value, size_t stringlen)
{
size_t i;
size_t len = 0;
int res;
PRINTF("{\"e\":[{\"n\":\"%u\",\"sv\":\"", ctx->resource_id);
res = snprintf((char *)outbuf, outlen, "{\"e\":[{\"n\":\"%u\",\"sv\":\"", ctx->resource_id);
if(res < 0 || res >= outlen) {
return 0;
}
len += res;
for (i = 0; i < stringlen && len < outlen; ++i) {
/* Escape special characters */
/* TODO: Handle UTF-8 strings */
if(value[i] < '\x20') {
PRINTF("\\x%x", value[i]);
res = snprintf((char *)&outbuf[len], outlen - len, "\\x%x", value[i]);
if((res < 0) || (res >= (outlen - len))) {
return 0;
}
len += res;
continue;
} else if(value[i] == '"' || value[i] == '\\') {
PRINTF("\\");
outbuf[len] = '\\';
++len;
if(len >= outlen) {
return 0;
}
}
PRINTF("%c", value[i]);
outbuf[len] = value[i];
++len;
if(len >= outlen) {
return 0;
}
}
PRINTF("\"}]}\n");
res = snprintf((char *)&outbuf[len], outlen - len, "\"}]}\n");
if((res < 0) || (res >= (outlen - len))) {
return 0;
}
len += res;
return len;
}
/*---------------------------------------------------------------------------*/
const lwm2m_writer_t lwm2m_json_writer = {
write_int,
write_string,
write_float32fix,
write_boolean
};
/*---------------------------------------------------------------------------*/
/** @} */

51
apps/oma-lwm2m/lwm2m-json.h Normal file
View File

@ -0,0 +1,51 @@
/*
* Copyright (c) 2016, Eistec AB.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \addtogroup oma-lwm2m
* @{
*/
/**
* \file
* Header file for the Contiki OMA LWM2M JSON writer
* \author
* Joakim Nohlgård <joakim.nohlgard@eistec.se>
*/
#ifndef LWM2M_JSON_H_
#define LWM2M_JSON_H_
#include "lwm2m-object.h"
extern const lwm2m_writer_t lwm2m_json_writer;
#endif /* LWM2M_JSON_H_ */
/** @} */