121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/*
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* Copyright (c) 2014, Lars Schmertmann <SmallLars@t-online.de>.
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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 Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* CoAP module for block 1 handling
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* \author
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* Lars Schmertmann <SmallLars@t-online.de>
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*/
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/**
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* \addtogroup coap
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* @{
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*/
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#include <string.h>
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#include <inttypes.h>
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#include "coap.h"
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#include "coap-block1.h"
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/* Log configuration */
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#include "coap-log.h"
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#define LOG_MODULE "coap-block1"
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#define LOG_LEVEL LOG_LEVEL_COAP
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Block 1 support within a coap-ressource
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*
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* This function will help you to use block 1. If target is null
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* error handling and response configuration is active. On return
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* value 0, the last block was recived, while on return value 1
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* more blocks will follow. With target, len and maxlen this
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* function will assemble the blocks.
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*
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* You can find an example in:
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* examples/er-rest-example/resources/res-b1-sep-b2.c
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*
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* \param request Request pointer from the handler
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* \param response Response pointer from the handler
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* \param target Pointer to the buffer where the request payload can be assembled
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* \param len Pointer to the variable, where the function stores the actual length
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* \param max_len Length of the "target"-Buffer
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*
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* \return 0 if initialisation was successful
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* -1 if initialisation failed
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*/
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int
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coap_block1_handler(coap_message_t *request, coap_message_t *response,
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uint8_t *target, size_t *len, size_t max_len)
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{
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const uint8_t *payload = 0;
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int pay_len = coap_get_payload(request, &payload);
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if(!pay_len || !payload) {
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coap_status_code = BAD_REQUEST_4_00;
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coap_error_message = "NoPayload";
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return -1;
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}
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if(request->block1_offset + pay_len > max_len) {
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coap_status_code = REQUEST_ENTITY_TOO_LARGE_4_13;
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coap_error_message = "Message to big";
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return -1;
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}
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if(target && len) {
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memcpy(target + request->block1_offset, payload, pay_len);
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*len = request->block1_offset + pay_len;
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}
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if(coap_is_option(request, COAP_OPTION_BLOCK1)) {
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LOG_DBG("Blockwise: block 1 request: Num: %"PRIu32
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", More: %u, Size: %u, Offset: %"PRIu32"\n",
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request->block1_num,
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request->block1_more,
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request->block1_size,
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request->block1_offset);
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coap_set_header_block1(response, request->block1_num, request->block1_more, request->block1_size);
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if(request->block1_more) {
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coap_set_status_code(response, CONTINUE_2_31);
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return 1;
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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