340 lines
10 KiB
C
340 lines
10 KiB
C
/*
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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 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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* Joakim Eriksson <joakime@sics.se> added JSON reader parts
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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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/* Log configuration */
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#include "coap-log.h"
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#define LOG_MODULE "lwm2m-json"
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#define LOG_LEVEL LOG_LEVEL_NONE
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/*---------------------------------------------------------------------------*/
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/* {"e":[{"n":"111/1","v":123},{"n":"111/2","v":42}]} */
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/* Begin String */
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#define T_NONE 0
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#define T_STRING_B 1
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#define T_STRING 2
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#define T_NAME 4
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#define T_VNUM 5
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#define T_OBJ 6
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#define T_VAL 7
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/* Simlified JSON style reader for reading in values from a LWM2M JSON
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string */
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int
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lwm2m_json_next_token(lwm2m_context_t *ctx, struct json_data *json)
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{
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int pos = ctx->inbuf->pos;
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uint8_t type = T_NONE;
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uint8_t vpos_start = 0;
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uint8_t vpos_end = 0;
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uint8_t cont;
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uint8_t wscount = 0;
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json->name_len = 0;
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json->value_len = 0;
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cont = 1;
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/* We will be either at start, or at a specific position */
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while(pos < ctx->inbuf->size && cont) {
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uint8_t c = ctx->inbuf->buffer[pos++];
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switch(c) {
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case '{': type = T_OBJ; break;
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case '}':
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case ',':
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if(type == T_VAL || type == T_STRING) {
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json->value = &ctx->inbuf->buffer[vpos_start];
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json->value_len = vpos_end - vpos_start - wscount;
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type = T_NONE;
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cont = 0;
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}
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wscount = 0;
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break;
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case '\\':
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/* stuffing */
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if(pos < ctx->inbuf->size) {
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pos++;
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vpos_end = pos;
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}
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break;
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case '"':
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if(type == T_STRING_B) {
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type = T_STRING;
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vpos_end = pos - 1;
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wscount = 0;
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} else {
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type = T_STRING_B;
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vpos_start = pos;
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}
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break;
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case ':':
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if(type == T_STRING) {
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json->name = &ctx->inbuf->buffer[vpos_start];
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json->name_len = vpos_end - vpos_start;
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vpos_start = vpos_end = pos;
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type = T_VAL;
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} else {
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/* Could be in string or at illegal pos */
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if(type != T_STRING_B) {
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LOG_DBG("ERROR - illegal ':'\n");
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}
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}
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break;
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/* ignore whitespace */
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case ' ':
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case '\n':
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case '\t':
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if(type != T_STRING_B) {
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if(vpos_start == pos - 1) {
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vpos_start = pos;
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} else {
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wscount++;
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}
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}
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default:
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vpos_end = pos;
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}
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}
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if(cont == 0 && pos < ctx->inbuf->size) {
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ctx->inbuf->pos = pos;
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}
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/* OK if cont == 0 othewise we failed */
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return cont == 0 && pos < ctx->inbuf->size;
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}
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/*---------------------------------------------------------------------------*/
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static size_t
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init_write(lwm2m_context_t *ctx)
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{
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int len = snprintf((char *)&ctx->outbuf->buffer[ctx->outbuf->len],
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ctx->outbuf->size - ctx->outbuf->len, "{\"bn\":\"/%u/%u/\",\"e\":[",
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ctx->object_id, ctx->object_instance_id);
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ctx->writer_flags = 0; /* set flags to zero */
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if((len < 0) || (len >= ctx->outbuf->size)) {
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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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end_write(lwm2m_context_t *ctx)
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{
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int len = snprintf((char *)&ctx->outbuf->buffer[ctx->outbuf->len],
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ctx->outbuf->size - ctx->outbuf->len, "]}");
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if((len < 0) || (len >= ctx->outbuf->size - ctx->outbuf->len)) {
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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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enter_sub(lwm2m_context_t *ctx)
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{
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/* set some flags in state */
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LOG_DBG("Enter sub-resource rsc=%d\n", ctx->resource_id);
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ctx->writer_flags |= WRITER_RESOURCE_INSTANCE;
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static size_t
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exit_sub(lwm2m_context_t *ctx)
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{
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/* clear out state info */
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LOG_DBG("Exit sub-resource rsc=%d\n", ctx->resource_id);
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ctx->writer_flags &= ~WRITER_RESOURCE_INSTANCE;
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static size_t
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write_boolean(lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
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int value)
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{
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char *sep = (ctx->writer_flags & WRITER_OUTPUT_VALUE) ? "," : "";
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int len;
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if(ctx->writer_flags & WRITER_RESOURCE_INSTANCE) {
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len = snprintf((char *)outbuf, outlen, "%s{\"n\":\"%u/%u\",\"bv\":%s}", sep, ctx->resource_id, ctx->resource_instance_id, value ? "true" : "false");
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} else {
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len = snprintf((char *)outbuf, outlen, "%s{\"n\":\"%u\",\"bv\":%s}", sep, ctx->resource_id, value ? "true" : "false");
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}
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if((len < 0) || (len >= outlen)) {
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return 0;
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}
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LOG_DBG("JSON: Write bool:%s\n", outbuf);
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ctx->writer_flags |= WRITER_OUTPUT_VALUE;
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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(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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char *sep = (ctx->writer_flags & WRITER_OUTPUT_VALUE) ? "," : "";
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int len;
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if(ctx->writer_flags & WRITER_RESOURCE_INSTANCE) {
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len = snprintf((char *)outbuf, outlen, "%s{\"n\":\"%u/%u\",\"v\":%"PRId32"}", sep, ctx->resource_id, ctx->resource_instance_id, value);
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} else {
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len = snprintf((char *)outbuf, outlen, "%s{\"n\":\"%u\",\"v\":%"PRId32"}", sep, ctx->resource_id, value);
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}
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if((len < 0) || (len >= outlen)) {
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return 0;
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}
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LOG_DBG("Write int:%s\n", outbuf);
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ctx->writer_flags |= WRITER_OUTPUT_VALUE;
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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(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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char *sep = (ctx->writer_flags & WRITER_OUTPUT_VALUE) ? "," : "";
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size_t len = 0;
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int res;
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if(ctx->writer_flags & WRITER_RESOURCE_INSTANCE) {
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res = snprintf((char *)outbuf, outlen, "%s{\"n\":\"%u/%u\",\"v\":", sep, ctx->resource_id, ctx->resource_instance_id);
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} else {
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res = snprintf((char *)outbuf, outlen, "%s{\"n\":\"%u\",\"v\":", sep, ctx->resource_id);
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}
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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, "}");
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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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ctx->writer_flags |= WRITER_OUTPUT_VALUE;
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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(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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char *sep = (ctx->writer_flags & WRITER_OUTPUT_VALUE) ? "," : "";
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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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LOG_DBG("{\"n\":\"%u\",\"sv\":\"", ctx->resource_id);
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if(ctx->writer_flags & WRITER_RESOURCE_INSTANCE) {
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res = snprintf((char *)outbuf, outlen, "%s{\"n\":\"%u/%u\",\"sv\":\"", sep,
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ctx->resource_id, ctx->resource_instance_id);
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} else {
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res = snprintf((char *)outbuf, outlen, "%s{\"n\":\"%u\",\"sv\":\"", sep,
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ctx->resource_id);
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}
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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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LOG_DBG_("\\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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LOG_DBG_("\\");
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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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LOG_DBG_("%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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LOG_DBG_("\"}\n");
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res = snprintf((char *)&outbuf[len], outlen - len, "\"}");
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if((res < 0) || (res >= (outlen - len))) {
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return 0;
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}
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LOG_DBG("JSON: Write string:%s\n", outbuf);
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len += res;
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ctx->writer_flags |= WRITER_OUTPUT_VALUE;
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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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init_write,
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end_write,
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enter_sub,
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exit_sub,
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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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/** @} */
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