oma-lwm2m: Add JSON writer
This commit is contained in:
Joakim Nohlgård
parent
9832b356ba
commit
e8edb6b1a0
@ -1,5 +1,13 @@
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oma-lwm2m_src = lwm2m-object.c lwm2m-engine.c \
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lwm2m-device.c lwm2m-server.c lwm2m-security.c \
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oma-tlv.c oma-tlv-reader.c oma-tlv-writer.c \
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lwm2m-plain-text.c
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oma-lwm2m_src = \
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lwm2m-object.c \
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lwm2m-engine.c \
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lwm2m-device.c \
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lwm2m-server.c \
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lwm2m-security.c \
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oma-tlv.c \
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oma-tlv-reader.c \
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oma-tlv-writer.c \
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lwm2m-plain-text.c \
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lwm2m-json.c \
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#
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CFLAGS += -DHAVE_OMA_LWM2M=1
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@ -46,6 +46,7 @@
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#include "lwm2m-object.h"
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#include "lwm2m-device.h"
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#include "lwm2m-plain-text.h"
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#include "lwm2m-json.h"
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#include "rest-engine.h"
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#include "er-coap-constants.h"
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#include "er-coap-engine.h"
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@ -727,6 +728,10 @@ lwm2m_engine_select_writer(lwm2m_context_t *context, unsigned int accept)
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case TEXT_PLAIN:
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context->writer = &lwm2m_plain_text_writer;
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break;
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case LWM2M_JSON:
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case APPLICATION_JSON:
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context->writer = &lwm2m_json_writer;
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break;
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default:
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PRINTF("Unknown Accept type %u, using LWM2M plain text\n", accept);
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context->writer = &lwm2m_plain_text_writer;
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162
apps/oma-lwm2m/lwm2m-json.c
Normal file
162
apps/oma-lwm2m/lwm2m-json.c
Normal file
@ -0,0 +1,162 @@
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/*
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* Copyright (c) 2016, Eistec AB.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup oma-lwm2m
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* @{
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*/
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/**
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* \file
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* Implementation of the Contiki OMA LWM2M JSON writer
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* \author
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* Joakim Nohlgård <joakim.nohlgard@eistec.se>
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*/
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#include "lwm2m-object.h"
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#include "lwm2m-json.h"
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#include "lwm2m-plain-text.h"
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#include <stdio.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <inttypes.h>
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#define DEBUG 0
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#if DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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static size_t
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write_boolean(const lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
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int value)
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{
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int len = snprintf((char *)outbuf, outlen, "{\"e\":[{\"n\":\"%u\",\"bv\":%s}]}\n", ctx->resource_id, value ? "true" : "false");
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if((len < 0) || (len >= outlen)) {
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return 0;
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}
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return len;
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}
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/*---------------------------------------------------------------------------*/
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static size_t
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write_int(const lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
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int32_t value)
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{
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int len = snprintf((char *)outbuf, outlen, "{\"e\":[{\"n\":\"%u\",\"v\":%" PRId32 "}]}\n", ctx->resource_id, value);
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if((len < 0) || (len >= outlen)) {
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return 0;
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}
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return len;
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}
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/*---------------------------------------------------------------------------*/
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static size_t
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write_float32fix(const lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
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int32_t value, int bits)
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{
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size_t len = 0;
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int res;
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res = snprintf((char *)outbuf, outlen, "{\"e\":[{\"n\":\"%u\",\"v\":", ctx->resource_id);
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if(res <= 0 || res >= outlen) {
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return 0;
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}
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len += res;
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outlen -= res;
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res = lwm2m_plain_text_write_float32fix(&outbuf[len], outlen, value, bits);
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if((res <= 0) || (res >= outlen)) {
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return 0;
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}
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len += res;
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outlen -= res;
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res = snprintf((char *)&outbuf[len], outlen, "}]}\n");
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if((res <= 0) || (res >= outlen)) {
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return 0;
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}
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len += res;
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return len;
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}
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/*---------------------------------------------------------------------------*/
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static size_t
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write_string(const lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
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const char *value, size_t stringlen)
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{
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size_t i;
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size_t len = 0;
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int res;
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PRINTF("{\"e\":[{\"n\":\"%u\",\"sv\":\"", ctx->resource_id);
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res = snprintf((char *)outbuf, outlen, "{\"e\":[{\"n\":\"%u\",\"sv\":\"", ctx->resource_id);
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if(res < 0 || res >= outlen) {
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return 0;
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}
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len += res;
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for (i = 0; i < stringlen && len < outlen; ++i) {
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/* Escape special characters */
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/* TODO: Handle UTF-8 strings */
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if(value[i] < '\x20') {
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PRINTF("\\x%x", value[i]);
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res = snprintf((char *)&outbuf[len], outlen - len, "\\x%x", value[i]);
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if((res < 0) || (res >= (outlen - len))) {
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return 0;
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}
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len += res;
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continue;
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} else if(value[i] == '"' || value[i] == '\\') {
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PRINTF("\\");
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outbuf[len] = '\\';
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++len;
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if(len >= outlen) {
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return 0;
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}
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}
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PRINTF("%c", value[i]);
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outbuf[len] = value[i];
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++len;
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if(len >= outlen) {
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return 0;
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}
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}
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PRINTF("\"}]}\n");
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res = snprintf((char *)&outbuf[len], outlen - len, "\"}]}\n");
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if((res < 0) || (res >= (outlen - len))) {
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return 0;
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}
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len += res;
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return len;
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}
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/*---------------------------------------------------------------------------*/
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const lwm2m_writer_t lwm2m_json_writer = {
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write_int,
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write_string,
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write_float32fix,
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write_boolean
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};
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/*---------------------------------------------------------------------------*/
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/** @} */
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51
apps/oma-lwm2m/lwm2m-json.h
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51
apps/oma-lwm2m/lwm2m-json.h
Normal file
@ -0,0 +1,51 @@
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/*
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* Copyright (c) 2016, Eistec AB.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup oma-lwm2m
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* @{
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*/
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/**
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* \file
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* Header file for the Contiki OMA LWM2M JSON writer
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* \author
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* Joakim Nohlgård <joakim.nohlgard@eistec.se>
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*/
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#ifndef LWM2M_JSON_H_
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#define LWM2M_JSON_H_
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#include "lwm2m-object.h"
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extern const lwm2m_writer_t lwm2m_json_writer;
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#endif /* LWM2M_JSON_H_ */
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/** @} */
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