nes-proj/os/services/lwm2m/lwm2m-tlv-reader.c

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