osd-contiki/examples/er-rest-example/resources/res-b1-sep-b2.c

112 lines
4.3 KiB
C

/*
* 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
* Example resource
* \author
* Lars Schmertmann <SmallLars@t-online.de>
*/
#include <string.h>
#include "rest-engine.h"
#include "er-coap-block1.h"
#include "er-coap-separate.h"
#include "er-coap-transactions.h"
static void res_post_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
SEPARATE_RESOURCE(res_b1_sep_b2, "title=\"Block1 + Separate + Block2 demo\"", NULL, res_post_handler, NULL, NULL, NULL);
#define MAX_DATA_LEN 256
static uint8_t big_msg[MAX_DATA_LEN];
static size_t big_msg_len = 0;
static coap_separate_t request_metadata;
static void
res_post_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
/* Example allows only one request on time. There are no checks for multiply access !!! */
if(*offset == 0) {
/* Incoming Data */
if(coap_block1_handler(request, response, big_msg, &big_msg_len, MAX_DATA_LEN)) {
/* More Blocks will follow. Example waits for
* the last block and stores data into big_msg.
*/
return;
}
/* Last block was received. */
coap_separate_accept(request, &request_metadata);
/* Need Time for calculation now */
int i;
for(i = 0; i <= 4096; i++) {
printf("\r%4u\r", i);
}
printf("\n");
/* Send first block */
coap_transaction_t *transaction = NULL;
if((transaction = coap_new_transaction(request_metadata.mid, &request_metadata.addr, request_metadata.port))) {
coap_packet_t resp[1]; /* This way the packet can be treated as pointer as usual. */
/* Restore the request information for the response. */
coap_separate_resume(resp, &request_metadata, CONTENT_2_05);
/* Set payload and block info */
coap_set_payload(resp, big_msg, big_msg_len > request_metadata.block2_size ? request_metadata.block2_size : big_msg_len);
if(big_msg_len > request_metadata.block2_size) {
coap_set_header_block2(resp, 0, 1, request_metadata.block2_size);
}
/* Warning: No check for serialization error. */
transaction->packet_len = coap_serialize_message(resp, transaction->packet);
coap_send_transaction(transaction);
}
} else {
/* request for more blocks */
if(*offset >= big_msg_len) {
coap_set_status_code(response, BAD_OPTION_4_02);
coap_set_payload(response, "BlockOutOfScope", 15);
return;
}
memcpy(buffer, big_msg + *offset, 32);
if(big_msg_len - *offset < preferred_size) {
preferred_size = big_msg_len - *offset;
*offset = -1;
} else {
*offset += preferred_size;
}
coap_set_payload(response, buffer, preferred_size);
}
}