contiki/examples/er-rest-example/resources/res-plugtest-large-update.c

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/*
* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
* 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
* ETSI Plugtest resource
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
#include <string.h>
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#include "sys/cc.h"
#include "rest-engine.h"
#include "er-coap.h"
#include "er-plugtest.h"
static void res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
static void res_put_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
RESOURCE(
res_plugtest_large_update,
"title=\"Large resource that can be updated using PUT method\";rt=\"block\";sz=\"" TO_STRING(MAX_PLUGFEST_BODY) "\"",
res_get_handler,
NULL,
res_put_handler,
NULL);
static int32_t large_update_size = 0;
static uint8_t large_update_store[MAX_PLUGFEST_BODY] = { 0 };
static unsigned int large_update_ct = APPLICATION_OCTET_STREAM;
static void
res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
/* Check the offset for boundaries of the resource data. */
if(*offset >= large_update_size) {
REST.set_response_status(response, REST.status.BAD_OPTION);
/* A block error message should not exceed the minimum block size (16). */
const char *error_msg = "BlockOutOfScope";
REST.set_response_payload(response, error_msg, strlen(error_msg));
return;
}
REST.set_response_payload(response, large_update_store + *offset,
MIN(large_update_size - *offset, preferred_size));
REST.set_header_content_type(response, large_update_ct);
/* IMPORTANT for chunk-wise resources: Signal chunk awareness to REST engine. */
*offset += preferred_size;
/* Signal end of resource representation. */
if(*offset >= large_update_size) {
*offset = -1;
}
}
static void
res_put_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
coap_packet_t *const coap_req = (coap_packet_t *)request;
uint8_t *incoming = NULL;
size_t len = 0;
unsigned int ct = -1;
if(!REST.get_header_content_type(request, &ct)) {
REST.set_response_status(response, REST.status.BAD_REQUEST);
const char *error_msg = "NoContentType";
REST.set_response_payload(response, error_msg, strlen(error_msg));
return;
}
if((len = REST.get_request_payload(request, (const uint8_t **)&incoming))) {
if(coap_req->block1_num * coap_req->block1_size + len <= sizeof(large_update_store)) {
memcpy(
large_update_store + coap_req->block1_num * coap_req->block1_size,
incoming, len);
large_update_size = coap_req->block1_num * coap_req->block1_size + len;
large_update_ct = ct;
REST.set_response_status(response, REST.status.CHANGED);
coap_set_header_block1(response, coap_req->block1_num, 0,
coap_req->block1_size);
} else {
REST.set_response_status(response,
REST.status.REQUEST_ENTITY_TOO_LARGE);
REST.set_response_payload(
response,
buffer,
snprintf((char *)buffer, MAX_PLUGFEST_PAYLOAD, "%uB max.",
sizeof(large_update_store)));
return;
}
} else {
REST.set_response_status(response, REST.status.BAD_REQUEST);
const char *error_msg = "NoPayload";
REST.set_response_payload(response, error_msg, strlen(error_msg));
return;
}
}