nes-proj/os/services/lwm2m/lwm2m-tlv-writer.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 writer
* \author
* Joakim Eriksson <joakime@sics.se>
* Niclas Finne <nfi@sics.se>
*/
#include "lwm2m-object.h"
#include "lwm2m-tlv.h"
/* Log configuration */
#include "coap-log.h"
#define LOG_MODULE "lwm2m-tlv"
#define LOG_LEVEL LOG_LEVEL_NONE
/*---------------------------------------------------------------------------*/
static size_t
init_write(lwm2m_context_t *ctx)
{
return 0;
}
/*---------------------------------------------------------------------------*/
static size_t
end_write(lwm2m_context_t *ctx)
{
return 0;
}
/*---------------------------------------------------------------------------*/
static size_t
write_int_tlv(lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
int32_t value)
{
uint8_t type = ctx->writer_flags & WRITER_RESOURCE_INSTANCE ?
LWM2M_TLV_TYPE_RESOURCE_INSTANCE : LWM2M_TLV_TYPE_RESOURCE;
uint16_t id = ctx->writer_flags & WRITER_RESOURCE_INSTANCE ?
ctx->resource_instance_id : ctx->resource_id;
return lwm2m_tlv_write_int32(type, id, value, outbuf, outlen);
}
/*---------------------------------------------------------------------------*/
static size_t
write_boolean_tlv(lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
int value)
{
return write_int_tlv(ctx, outbuf, outlen, value != 0 ? 1 : 0);
}
/*---------------------------------------------------------------------------*/
static size_t
write_float32fix_tlv(lwm2m_context_t *ctx, uint8_t *outbuf,
size_t outlen, int32_t value, int bits)
{
uint8_t type = ctx->writer_flags & WRITER_RESOURCE_INSTANCE ?
LWM2M_TLV_TYPE_RESOURCE_INSTANCE : LWM2M_TLV_TYPE_RESOURCE;
uint16_t id = ctx->writer_flags & WRITER_RESOURCE_INSTANCE ?
ctx->resource_instance_id : ctx->resource_id;
return lwm2m_tlv_write_float32(type, id, value, bits, outbuf, outlen);
}
/*---------------------------------------------------------------------------*/
static size_t
write_string_tlv(lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
const char *value, size_t stringlen)
{
lwm2m_tlv_t tlv;
tlv.type = ctx->writer_flags & WRITER_RESOURCE_INSTANCE ?
LWM2M_TLV_TYPE_RESOURCE_INSTANCE : LWM2M_TLV_TYPE_RESOURCE;
tlv.value = (uint8_t *) value;
tlv.length = (uint32_t) stringlen;
tlv.id = ctx->resource_id;
return lwm2m_tlv_write(&tlv, outbuf, outlen);
}
/*---------------------------------------------------------------------------*/
static size_t
write_opaque_header(lwm2m_context_t *ctx, size_t payloadsize)
{
lwm2m_tlv_t tlv;
tlv.type = LWM2M_TLV_TYPE_RESOURCE;
tlv.value = (uint8_t *) NULL;
tlv.length = (uint32_t) payloadsize;
tlv.id = ctx->resource_id;
return lwm2m_tlv_write(&tlv, &ctx->outbuf->buffer[ctx->outbuf->len],
ctx->outbuf->size - ctx->outbuf->len);
}
/*---------------------------------------------------------------------------*/
static size_t
enter_sub(lwm2m_context_t *ctx)
{
/* set some flags in state */
lwm2m_tlv_t tlv;
int len = 0;
LOG_DBG("Enter sub-resource rsc=%d mark:%d\n", ctx->resource_id, ctx->outbuf->len);
ctx->writer_flags |= WRITER_RESOURCE_INSTANCE;
tlv.type = LWM2M_TLV_TYPE_MULTI_RESOURCE;
tlv.length = 8; /* create an 8-bit TLV */
tlv.value = NULL;
tlv.id = ctx->resource_id;
len = lwm2m_tlv_write(&tlv, &ctx->outbuf->buffer[ctx->outbuf->len],
ctx->outbuf->size - ctx->outbuf->len);
/* store position for deciding where to re-write the TLV when we
know the length - NOTE: either this or memmov of buffer later... */
ctx->out_mark_pos_ri = ctx->outbuf->len;
return len;
}
/*---------------------------------------------------------------------------*/
static size_t
exit_sub(lwm2m_context_t *ctx)
{
/* clear out state info */
int pos = 2; /* this is the lenght pos */
int len;
ctx->writer_flags &= ~WRITER_RESOURCE_INSTANCE;
if(ctx->resource_id > 0xff) {
pos++;
}
len = ctx->outbuf->len - ctx->out_mark_pos_ri;
LOG_DBG("Exit sub-resource rsc=%d mark:%d len=%d\n", ctx->resource_id,
ctx->out_mark_pos_ri, len);
/* update the lenght byte... Assume TLV header is pos + 1 bytes. */
ctx->outbuf->buffer[pos + ctx->out_mark_pos_ri] = len - (pos + 1);
return 0;
}
/*---------------------------------------------------------------------------*/
const lwm2m_writer_t lwm2m_tlv_writer = {
init_write,
end_write,
enter_sub,
exit_sub,
write_int_tlv,
write_string_tlv,
write_float32fix_tlv,
write_boolean_tlv,
write_opaque_header
};
/*---------------------------------------------------------------------------*/
/** @} */