nes-proj/os/net/app-layer/coap/coap-block1.c

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/*
* Copyright (c) 2014, Lars Schmertmann <SmallLars@t-online.de>.
* 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*/
/**
* \file
* CoAP module for block 1 handling
* \author
* Lars Schmertmann <SmallLars@t-online.de>
*/
/**
* \addtogroup coap
* @{
*/
#include <string.h>
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#include <inttypes.h>
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#include "coap.h"
#include "coap-block1.h"
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/* Log configuration */
#include "coap-log.h"
#define LOG_MODULE "coap-block1"
#define LOG_LEVEL LOG_LEVEL_COAP
/*---------------------------------------------------------------------------*/
/**
* \brief Block 1 support within a coap-ressource
*
* This function will help you to use block 1. If target is null
* error handling and response configuration is active. On return
* value 0, the last block was recived, while on return value 1
* more blocks will follow. With target, len and maxlen this
* function will assemble the blocks.
*
* You can find an example in:
* examples/er-rest-example/resources/res-b1-sep-b2.c
*
* \param request Request pointer from the handler
* \param response Response pointer from the handler
* \param target Pointer to the buffer where the request payload can be assembled
* \param len Pointer to the variable, where the function stores the actual length
* \param max_len Length of the "target"-Buffer
*
* \return 0 if initialisation was successful
* -1 if initialisation failed
*/
int
coap_block1_handler(coap_message_t *request, coap_message_t *response,
uint8_t *target, size_t *len, size_t max_len)
{
const uint8_t *payload = 0;
int pay_len = coap_get_payload(request, &payload);
if(!pay_len || !payload) {
coap_status_code = BAD_REQUEST_4_00;
coap_error_message = "NoPayload";
return -1;
}
if(request->block1_offset + pay_len > max_len) {
coap_status_code = REQUEST_ENTITY_TOO_LARGE_4_13;
coap_error_message = "Message to big";
return -1;
}
if(target && len) {
memcpy(target + request->block1_offset, payload, pay_len);
*len = request->block1_offset + pay_len;
}
if(coap_is_option(request, COAP_OPTION_BLOCK1)) {
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LOG_DBG("Blockwise: block 1 request: Num: %"PRIu32
", More: %u, Size: %u, Offset: %"PRIu32"\n",
request->block1_num,
request->block1_more,
request->block1_size,
request->block1_offset);
coap_set_header_block1(response, request->block1_num, request->block1_more, request->block1_size);
if(request->block1_more) {
coap_set_status_code(response, CONTINUE_2_31);
return 1;
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
/** @} */