120 lines
3.8 KiB
C
120 lines
3.8 KiB
C
/*
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* Copyright (c) 2015-2018, Yanzi Networks 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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/**
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* \file
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* Implementation of the Contiki OMA LWM2M TLV reader
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* \author
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* Joakim Eriksson <joakime@sics.se>
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* Niclas Finne <nfi@sics.se>
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*/
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#include "lwm2m-object.h"
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#include "lwm2m-tlv-reader.h"
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#include "lwm2m-tlv.h"
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#include <string.h>
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/*---------------------------------------------------------------------------*/
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static size_t
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read_int(lwm2m_context_t *ctx, const uint8_t *inbuf, size_t len,
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int32_t *value)
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{
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lwm2m_tlv_t tlv;
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size_t size;
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size = lwm2m_tlv_read(&tlv, inbuf, len);
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if(size > 0) {
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*value = lwm2m_tlv_get_int32(&tlv);
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ctx->last_value_len = tlv.length;
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}
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return size;
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}
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/*---------------------------------------------------------------------------*/
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static size_t
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read_string(lwm2m_context_t *ctx, const uint8_t *inbuf, size_t len,
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uint8_t *value, size_t stringlen)
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{
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lwm2m_tlv_t tlv;
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size_t size;
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size = lwm2m_tlv_read(&tlv, inbuf, len);
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if(size > 0) {
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if(stringlen <= tlv.length) {
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/* The outbuffer can not contain the full string including ending zero */
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return 0;
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}
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memcpy(value, tlv.value, tlv.length);
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value[tlv.length] = '\0';
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ctx->last_value_len = tlv.length;
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}
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return size;
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}
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/*---------------------------------------------------------------------------*/
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static size_t
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read_float32fix(lwm2m_context_t *ctx, const uint8_t *inbuf, size_t len,
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int32_t *value, int bits)
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{
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lwm2m_tlv_t tlv;
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size_t size;
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size = lwm2m_tlv_read(&tlv, inbuf, len);
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if(size > 0) {
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lwm2m_tlv_float32_to_fix(&tlv, value, bits);
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ctx->last_value_len = tlv.length;
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}
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return size;
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}
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/*---------------------------------------------------------------------------*/
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static size_t
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read_boolean(lwm2m_context_t *ctx, const uint8_t *inbuf, size_t len,
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int *value)
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{
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lwm2m_tlv_t tlv;
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size_t size;
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size = lwm2m_tlv_read(&tlv, inbuf, len);
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if(size > 0) {
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*value = lwm2m_tlv_get_int32(&tlv) != 0;
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ctx->last_value_len = tlv.length;
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}
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return size;
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}
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/*---------------------------------------------------------------------------*/
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const lwm2m_reader_t lwm2m_tlv_reader = {
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read_int,
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read_string,
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read_float32fix,
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read_boolean
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};
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/*---------------------------------------------------------------------------*/
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/** @} */
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