File content as of revision 10:b5ecd6660d71:

/**
 *\file sn_coap_parser.c
 *
 * \brief CoAP Header parser
 *
 * Functionality: Parses CoAP Header
 *
 *  Created on: Jun 30, 2011
 *      Author: tero
 *
 * \note Supports draft-ietf-core-coap-12
 */

/* * * * * * * * * * * * * * */
/* * * * INCLUDE FILES * * * */
/* * * * * * * * * * * * * * */

#include <stdio.h>
#include <string.h> /* For memset() and memcpy() */

#include "nsdl_types.h"
#include "sn_nsdl.h"
#include "sn_coap_header.h"
#include "sn_coap_protocol.h"
#include "sn_coap_header_internal.h"
#include "sn_coap_protocol_internal.h"

/* * * * * * * * * * * * * * * * * * * * */
/* * * * LOCAL FUNCTION PROTOTYPES * * * */
/* * * * * * * * * * * * * * * * * * * * */

static void     sn_coap_parser_header_parse(uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr, coap_version_e *coap_version_ptr);
static int8_t   sn_coap_parser_options_parse(uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr, uint8_t *packet_data_start_ptr, uint16_t packet_len);
static int8_t	sn_coap_parser_options_parse_multiple_options(uint8_t **packet_data_pptr, uint16_t packet_left_len,  uint8_t **dst_pptr, uint16_t *dst_len_ptr, sn_coap_option_numbers_e option, uint16_t option_number_len);
static int16_t 	sn_coap_parser_options_count_needed_memory_multiple_option(uint8_t *packet_data_ptr, uint16_t packet_left_len, sn_coap_option_numbers_e option, uint16_t option_number_len);
static int8_t   sn_coap_parser_payload_parse(uint16_t packet_data_len, uint8_t *packet_data_start_ptr, uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr);

/* * * * * * * * * * * * * * * * * */
/* * * * GLOBAL DECLARATIONS * * * */
/* * * * * * * * * * * * * * * * * */

/**
 * \fn sn_coap_hdr_s *sn_coap_parser(uint16_t packet_data_len, uint8_t *packet_data_ptr, coap_version_e *coap_version_ptr)
 *
 * \brief Parses CoAP message from given Packet data
 *
 * \param packet_data_len is length of given Packet data to be parsed to CoAP message
 *
 * \param *packet_data_ptr is source for Packet data to be parsed to CoAP message
 *
 * \param *coap_version_ptr is destination for parsed CoAP specification version
 *
 * \return Return value is pointer to parsed CoAP message.\n
 *         In following failure cases NULL is returned:\n
 *          -Failure in given pointer (= NULL)\n
 *          -Failure in memory allocation (malloc() returns NULL)
 */
sn_coap_hdr_s *sn_coap_parser(uint16_t packet_data_len, uint8_t *packet_data_ptr, coap_version_e *coap_version_ptr)
{
    uint8_t       *data_temp_ptr                    = packet_data_ptr;
    sn_coap_hdr_s *parsed_and_returned_coap_msg_ptr = NULL;

    /* * * * Check given pointer * * * */
    if (packet_data_ptr == NULL || packet_data_len < 4)
        return NULL;

    /* * * * Allocate memory for parsed and returned CoAP message and initialize allocated memory with with zero values  * * * */
    parsed_and_returned_coap_msg_ptr = sn_coap_malloc(sizeof(sn_coap_hdr_s));

    if (parsed_and_returned_coap_msg_ptr == NULL)
        return NULL;

    memset(parsed_and_returned_coap_msg_ptr, 0x00, sizeof(sn_coap_hdr_s));


    /* * * * Header parsing, move pointer over the header...  * * * */
    sn_coap_parser_header_parse(&data_temp_ptr, parsed_and_returned_coap_msg_ptr, coap_version_ptr);


    /* * * * Options parsing, move pointer over the options... * * * */
    if (sn_coap_parser_options_parse(&data_temp_ptr, parsed_and_returned_coap_msg_ptr, packet_data_ptr, packet_data_len) != 0)
    {
        /* Release memory of CoAP message */
        sn_coap_parser_release_allocated_coap_msg_mem(parsed_and_returned_coap_msg_ptr);
        return NULL;
    }

    /* * * * Payload parsing * * * */
    if(sn_coap_parser_payload_parse(packet_data_len, packet_data_ptr, &data_temp_ptr, parsed_and_returned_coap_msg_ptr) == -1)
    {
		/* Release memory of CoAP message */
		sn_coap_parser_release_allocated_coap_msg_mem(parsed_and_returned_coap_msg_ptr);
		return NULL;
    }
    /* * * * Return parsed CoAP message  * * * * */
    return parsed_and_returned_coap_msg_ptr;
}

/**
 * \fn void sn_coap_parser_release_allocated_coap_msg_mem(sn_coap_hdr_s *freed_coap_msg_ptr)
 *
 * \brief Releases memory of given CoAP message
 *
 *        Note!!! Does not release Payload part
 *
 * \param *freed_coap_msg_ptr is pointer to released CoAP message
 */

void sn_coap_parser_release_allocated_coap_msg_mem(sn_coap_hdr_s *freed_coap_msg_ptr)
{
    if (freed_coap_msg_ptr != NULL)
    {
        if (freed_coap_msg_ptr->uri_path_ptr != NULL)
        {
            sn_coap_free(freed_coap_msg_ptr->uri_path_ptr);
        }

        if (freed_coap_msg_ptr->token_ptr != NULL)
        {
            sn_coap_free(freed_coap_msg_ptr->token_ptr);
        }

        if (freed_coap_msg_ptr->content_type_ptr != NULL)
        {
            sn_coap_free(freed_coap_msg_ptr->content_type_ptr);
        }

        if (freed_coap_msg_ptr->options_list_ptr != NULL)
        {
            if (freed_coap_msg_ptr->options_list_ptr->max_age_ptr != NULL)
            {
                sn_coap_free(freed_coap_msg_ptr->options_list_ptr->max_age_ptr);
            }

            if (freed_coap_msg_ptr->options_list_ptr->proxy_uri_ptr != NULL)
            {
                sn_coap_free(freed_coap_msg_ptr->options_list_ptr->proxy_uri_ptr);
            }

            if (freed_coap_msg_ptr->options_list_ptr->etag_ptr != NULL)
            {
                sn_coap_free(freed_coap_msg_ptr->options_list_ptr->etag_ptr);
            }

            if (freed_coap_msg_ptr->options_list_ptr->uri_host_ptr != NULL)
            {
                sn_coap_free(freed_coap_msg_ptr->options_list_ptr->uri_host_ptr);
            }

            if (freed_coap_msg_ptr->options_list_ptr->location_path_ptr != NULL)
            {
                sn_coap_free(freed_coap_msg_ptr->options_list_ptr->location_path_ptr);
            }

            if (freed_coap_msg_ptr->options_list_ptr->uri_port_ptr != NULL)
            {
                sn_coap_free(freed_coap_msg_ptr->options_list_ptr->uri_port_ptr);
            }

            if (freed_coap_msg_ptr->options_list_ptr->location_query_ptr != NULL)
            {
                sn_coap_free(freed_coap_msg_ptr->options_list_ptr->location_query_ptr);
            }

            if (freed_coap_msg_ptr->options_list_ptr->observe_ptr != NULL)
            {
                sn_coap_free(freed_coap_msg_ptr->options_list_ptr->observe_ptr);
            }

            if (freed_coap_msg_ptr->options_list_ptr->uri_query_ptr != NULL)
            {
                sn_coap_free(freed_coap_msg_ptr->options_list_ptr->uri_query_ptr);
            }

            if (freed_coap_msg_ptr->options_list_ptr->block2_ptr != NULL)
            {
                sn_coap_free(freed_coap_msg_ptr->options_list_ptr->block2_ptr);
            }

            if (freed_coap_msg_ptr->options_list_ptr->block1_ptr != NULL)
            {
                sn_coap_free(freed_coap_msg_ptr->options_list_ptr->block1_ptr);
            }
            if (freed_coap_msg_ptr->options_list_ptr->accept_ptr != NULL)
             {
                 sn_coap_free(freed_coap_msg_ptr->options_list_ptr->accept_ptr);
             }

            sn_coap_free(freed_coap_msg_ptr->options_list_ptr);
        }

        sn_coap_free(freed_coap_msg_ptr);
    }
}

/**
 * \fn static void sn_coap_parser_header_parse(uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr, coap_version_e *coap_version_ptr)
 *
 * \brief Parses CoAP message's Header part from given Packet data
 *
 * \param **packet_data_ptr is source for Packet data to be parsed to CoAP message
 *
 * \param *dst_coap_msg_ptr is destination for parsed CoAP message
 *
 * \param *coap_version_ptr is destination for parsed CoAP specification version
 */

static void sn_coap_parser_header_parse(uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr, coap_version_e *coap_version_ptr)
{
    /* Parse CoAP Version and message type*/
    *coap_version_ptr = (coap_version_e)(**packet_data_pptr & COAP_HEADER_VERSION_MASK);
    dst_coap_msg_ptr->msg_type = (sn_coap_msg_type_e)(**packet_data_pptr & COAP_HEADER_MSG_TYPE_MASK);
    (*packet_data_pptr) += 1;

    /* Parse Message code */
    dst_coap_msg_ptr->msg_code = (sn_coap_msg_code_e)**packet_data_pptr;
    (*packet_data_pptr) += 1;

    /* Parse Message ID */
    dst_coap_msg_ptr->msg_id = *(*packet_data_pptr+1);
    dst_coap_msg_ptr->msg_id += **packet_data_pptr << COAP_HEADER_MSG_ID_MSB_SHIFT;
    (*packet_data_pptr) += 2;

}

/**
 * \fn static uint8_t sn_coap_parser_options_parse(uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr)
 *
 * \brief Parses CoAP message's Options part from given Packet data
 *
 * \param **packet_data_pptr is source of Packet data to be parsed to CoAP message
 * \param *dst_coap_msg_ptr is destination for parsed CoAP message
 *
 * \return Return value is 0 in ok case and -1 in failure case
 */

static int8_t sn_coap_parser_options_parse(uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr, uint8_t *packet_data_start_ptr, uint16_t packet_len)
{
    uint8_t previous_option_number = 0;
    uint8_t i                      = 0;
    int8_t  ret_status             = 0;
    uint16_t message_left 		   = 0;


    /*  Parse token, if exists  */
    dst_coap_msg_ptr->token_len = *packet_data_start_ptr & COAP_HEADER_TOKEN_LENGTH_MASK;

    if(dst_coap_msg_ptr->token_len)
    {
    	if((dst_coap_msg_ptr->token_len > 8) || dst_coap_msg_ptr->token_ptr)
    		return -1;

    	dst_coap_msg_ptr->token_ptr = sn_coap_malloc(dst_coap_msg_ptr->token_len);

    	if (dst_coap_msg_ptr->token_ptr == NULL)
    	{
    		return -1;
    	}

    	memcpy(dst_coap_msg_ptr->token_ptr, *packet_data_pptr, dst_coap_msg_ptr->token_len);
    	(*packet_data_pptr) += dst_coap_msg_ptr->token_len;
    }

    message_left = packet_len - ((*packet_data_pptr) - packet_data_start_ptr);

    /* Loop all Options */
    while((**packet_data_pptr != 0xff) && message_left)
    {

    	/* Get option length WITHOUT extensions */
    	uint16_t option_len = (**packet_data_pptr & 0x0F);

    	/* Option number length 15 is reserved for the future use - ERROR */
    	if(option_len == 15)
    		return -1;

    	/* Resolve option delta */
        uint16_t  option_number = (**packet_data_pptr >> COAP_OPTIONS_OPTION_NUMBER_SHIFT);

        if(option_number == 13)
        {
        	option_number = *(*packet_data_pptr+1) + 13;
        	(*packet_data_pptr)++;
        }
        else if(option_number == 14)
        {
        	option_number = *(*packet_data_pptr+2);
        	option_number += (*(*packet_data_pptr+1) << 8) + 269;
        	(*packet_data_pptr) += 2;
        }
        /* Option number 15 reserved for payload marker. This is handled as a error! */
        else if(option_number == 15)
        	return -1;
        
        /* Add previous option to option delta and get option number */
        option_number += previous_option_number;

        /* Add possible option length extension to resolve full length of the option */
        if(option_len == 13)
        {
        	option_len = *(*packet_data_pptr+1) + 13;
        	(*packet_data_pptr)++;
        }
        else if(option_len == 14)
        {
        	option_len = *(*packet_data_pptr+2);
        	option_len += (*(*packet_data_pptr+1) << 8) + 269;
        	(*packet_data_pptr) += 2;
        }


        /* * * Parse option itself * * */
        /* Some options are handled independently in own functions */
        previous_option_number = option_number;

        /* Allocate options_list_ptr if needed */
        switch (option_number)
        {
            case COAP_OPTION_MAX_AGE:
            case COAP_OPTION_PROXY_URI:
            case COAP_OPTION_ETAG:
            case COAP_OPTION_URI_HOST:
            case COAP_OPTION_LOCATION_PATH:
            case COAP_OPTION_URI_PORT:
            case COAP_OPTION_LOCATION_QUERY:
            case COAP_OPTION_OBSERVE:
            case COAP_OPTION_URI_QUERY:
            case COAP_OPTION_BLOCK2:
            case COAP_OPTION_BLOCK1:
            case COAP_OPTION_ACCEPT:
            if (dst_coap_msg_ptr->options_list_ptr == NULL)
                {
                    dst_coap_msg_ptr->options_list_ptr = sn_coap_malloc(sizeof(sn_coap_options_list_s));
                    if(NULL == dst_coap_msg_ptr->options_list_ptr)
                    {
                    	return -1;
                    }
                	memset(dst_coap_msg_ptr->options_list_ptr, 0, sizeof(sn_coap_options_list_s));
                }
                break;
        }

        /* Parse option */
        switch (option_number)
        {
            case COAP_OPTION_CONTENT_FORMAT:
            	if((option_len > 2) || (dst_coap_msg_ptr->content_type_ptr))
            		return -1;
                dst_coap_msg_ptr->content_type_len = option_len;
                (*packet_data_pptr)++;

                if(option_len)
                {
                	dst_coap_msg_ptr->content_type_ptr = sn_coap_malloc(option_len);

                	if (dst_coap_msg_ptr->content_type_ptr == NULL)
                	{
                    	return -1;
                	}

                	memcpy(dst_coap_msg_ptr->content_type_ptr, *packet_data_pptr, option_len);
                    (*packet_data_pptr) += option_len;
                }
                break;

            case COAP_OPTION_MAX_AGE:
            	if((option_len > 4) || dst_coap_msg_ptr->options_list_ptr->max_age_ptr)
            		return -1;
                dst_coap_msg_ptr->options_list_ptr->max_age_len = option_len;
                (*packet_data_pptr)++;

                if(option_len)
                {
                	dst_coap_msg_ptr->options_list_ptr->max_age_ptr = sn_coap_malloc(option_len);

                	if (dst_coap_msg_ptr->options_list_ptr->max_age_ptr == NULL)
                	{
                		return -1;
                	}

                	memcpy(dst_coap_msg_ptr->options_list_ptr->max_age_ptr, *packet_data_pptr, option_len);
                    (*packet_data_pptr) += option_len;
                }
                break;

            case COAP_OPTION_PROXY_URI:
            	if ((option_len > 1034) || (option_len < 1) || dst_coap_msg_ptr->options_list_ptr->proxy_uri_ptr)
            		return -1;
                dst_coap_msg_ptr->options_list_ptr->proxy_uri_len = option_len;
                (*packet_data_pptr)++;

                dst_coap_msg_ptr->options_list_ptr->proxy_uri_ptr = sn_coap_malloc(option_len);

                if (dst_coap_msg_ptr->options_list_ptr->proxy_uri_ptr == NULL)
                {
                    return -1;
                }
                memcpy(dst_coap_msg_ptr->options_list_ptr->proxy_uri_ptr, *packet_data_pptr, option_len);
                (*packet_data_pptr) += option_len;

                break;

            case COAP_OPTION_ETAG:
            	if(dst_coap_msg_ptr->options_list_ptr->etag_ptr)
            		return -1;
                /* This is managed independently because User gives this option in one character table */

            	ret_status = sn_coap_parser_options_parse_multiple_options	(packet_data_pptr,
            															message_left,
            															&dst_coap_msg_ptr->options_list_ptr->etag_ptr,
            															(uint16_t*)&dst_coap_msg_ptr->options_list_ptr->etag_len,
            															COAP_OPTION_LOCATION_PATH, option_len);
                if (ret_status >= 0)
                {
                    i += (ret_status - 1); /* i += is because possible several Options are handled by sn_coap_parser_options_parse_multiple_options() */
                }
                else
                {
                    return -1;
                }
                break;

            case COAP_OPTION_URI_HOST:
            	if((option_len > 255) || (option_len < 1) || dst_coap_msg_ptr->options_list_ptr->uri_host_ptr)
            		return -1;
                dst_coap_msg_ptr->options_list_ptr->uri_host_len = option_len;
                (*packet_data_pptr)++;

                dst_coap_msg_ptr->options_list_ptr->uri_host_ptr = sn_coap_malloc(option_len);

                if (dst_coap_msg_ptr->options_list_ptr->uri_host_ptr == NULL)
                {
                    return -1;
                }
                memcpy(dst_coap_msg_ptr->options_list_ptr->uri_host_ptr, *packet_data_pptr, option_len);
                (*packet_data_pptr) += option_len;

                break;

            case COAP_OPTION_LOCATION_PATH:
            	if(dst_coap_msg_ptr->options_list_ptr->location_path_ptr)
            		return -1;
                /* This is managed independently because User gives this option in one character table */
            	ret_status = sn_coap_parser_options_parse_multiple_options(packet_data_pptr, message_left,
            	                                                                   &dst_coap_msg_ptr->options_list_ptr->location_path_ptr, &dst_coap_msg_ptr->options_list_ptr->location_path_len,
            	                                                                   COAP_OPTION_LOCATION_PATH, option_len);
                if (ret_status >= 0)
                {
                    i += (ret_status - 1); /* i += is because possible several Options are handled by sn_coap_parser_options_parse_multiple_options() */
                }
                else
                {
                    return -1;
                }

                break;


            case COAP_OPTION_URI_PORT:
            	if((option_len > 2) || dst_coap_msg_ptr->options_list_ptr->uri_port_ptr)
            		return -1;
                dst_coap_msg_ptr->options_list_ptr->uri_port_len = option_len;
                (*packet_data_pptr)++;

                if(option_len)
                {
					dst_coap_msg_ptr->options_list_ptr->uri_port_ptr = sn_coap_malloc(option_len);

					if (dst_coap_msg_ptr->options_list_ptr->uri_port_ptr == NULL)
					{
						return -1;
					}
					memcpy(dst_coap_msg_ptr->options_list_ptr->uri_port_ptr, *packet_data_pptr, option_len);
		            (*packet_data_pptr) += option_len;
                }
                break;

            case COAP_OPTION_LOCATION_QUERY:
            	if(dst_coap_msg_ptr->options_list_ptr->location_query_ptr)
            		return -1;
            	ret_status = sn_coap_parser_options_parse_multiple_options(packet_data_pptr, message_left,
            	                                                                   &dst_coap_msg_ptr->options_list_ptr->location_query_ptr, &dst_coap_msg_ptr->options_list_ptr->location_query_len,
            	                                                                   COAP_OPTION_LOCATION_QUERY, option_len);
                if (ret_status >= 0)
                {
                    i += (ret_status - 1); /* i += is because possible several Options are handled by sn_coap_parser_options_parse_multiple_options() */
                }
                else
                {
                    return -1;
                }

                break;

            case COAP_OPTION_URI_PATH:
            	if(dst_coap_msg_ptr->uri_path_ptr)
            		return -1;
            	ret_status = sn_coap_parser_options_parse_multiple_options(packet_data_pptr, message_left,
            	                                                                   &dst_coap_msg_ptr->uri_path_ptr, &dst_coap_msg_ptr->uri_path_len,
            	                                                                   COAP_OPTION_URI_PATH, option_len);
                if (ret_status >= 0)
                {
                    i += (ret_status - 1); /* i += is because possible several Options are handled by sn_coap_parser_options_parse_multiple_options() */
                }
                else
                {
                    return -1;
                }

                break;

            case COAP_OPTION_OBSERVE:
            	if((option_len > 2) || dst_coap_msg_ptr->options_list_ptr->observe_ptr)
            		return -1;

            	dst_coap_msg_ptr->options_list_ptr->observe = 1;
                (*packet_data_pptr)++;

            	if(option_len)
            	{

					dst_coap_msg_ptr->options_list_ptr->observe_len = option_len;

					dst_coap_msg_ptr->options_list_ptr->observe_ptr = sn_coap_malloc(option_len);

					if (dst_coap_msg_ptr->options_list_ptr->observe_ptr == NULL)
					{
						return -1;
					}

					memcpy(dst_coap_msg_ptr->options_list_ptr->observe_ptr, *packet_data_pptr, option_len);
		            (*packet_data_pptr) += option_len;
            	}

                break;

            case COAP_OPTION_URI_QUERY:
            	if(dst_coap_msg_ptr->options_list_ptr->uri_query_ptr)
            		return -1;
            	ret_status = sn_coap_parser_options_parse_multiple_options(packet_data_pptr, message_left,
            	                                                                   &dst_coap_msg_ptr->options_list_ptr->uri_query_ptr, &dst_coap_msg_ptr->options_list_ptr->uri_query_len,
            	                                                                   COAP_OPTION_URI_QUERY, option_len);
				if (ret_status >= 0)
				{
					i += (ret_status - 1); /* i += is because possible several Options are handled by sn_coap_parser_options_parse_multiple_options() */
				}
				else
				{
					return -1;
				}

				break;

            case COAP_OPTION_BLOCK2:
            	if((option_len > 4) || dst_coap_msg_ptr->options_list_ptr->block2_ptr)
            		return -1;
                dst_coap_msg_ptr->options_list_ptr->block2_len = option_len;
                (*packet_data_pptr)++;

                dst_coap_msg_ptr->options_list_ptr->block2_ptr = sn_coap_malloc(option_len);

                if (dst_coap_msg_ptr->options_list_ptr->block2_ptr == NULL)
                {
                    return -1;
                }

                memcpy(dst_coap_msg_ptr->options_list_ptr->block2_ptr, *packet_data_pptr, option_len);
	            (*packet_data_pptr) += option_len;

                break;

            case COAP_OPTION_BLOCK1:
            	if((option_len > 4) || dst_coap_msg_ptr->options_list_ptr->block1_ptr)
            		return -1;
                dst_coap_msg_ptr->options_list_ptr->block1_len = option_len;
                (*packet_data_pptr)++;

                dst_coap_msg_ptr->options_list_ptr->block1_ptr = sn_coap_malloc(option_len);

                if (dst_coap_msg_ptr->options_list_ptr->block1_ptr == NULL)
                {
                    return -1;
                }

                memcpy(dst_coap_msg_ptr->options_list_ptr->block1_ptr, *packet_data_pptr, option_len);
	            (*packet_data_pptr) += option_len;

                break;

            case COAP_OPTION_ACCEPT:
            	if(dst_coap_msg_ptr->options_list_ptr->accept_ptr)
            		return -1;
            	ret_status = sn_coap_parser_options_parse_multiple_options(packet_data_pptr, message_left,
            	                                                                   &dst_coap_msg_ptr->options_list_ptr->accept_ptr, (uint16_t *)&dst_coap_msg_ptr->options_list_ptr->accept_len,
            	                                                                   COAP_OPTION_ACCEPT, option_len);
				if (ret_status >= 0)
				{
					i += (ret_status - 1); /* i += is because possible several Options are handled by sn_coap_parser_options_parse_multiple_options() */
				}
				else
				{
					return -1;
				}

				break;

            default:
            	return -1;
        }

                /* Check for overflow */
        if((*packet_data_pptr - packet_data_start_ptr) > packet_len)
        	return -1;

        message_left = packet_len - (*packet_data_pptr - packet_data_start_ptr);	//todo: if(*packet_data_pptr < packet_data_start_ptr) message_left = 0; else


    }

    return 0;
}


/**
 * \fn static int8_t sn_coap_parser_options_parse_multiple_options(uint8_t **packet_data_pptr, uint8_t options_count_left, uint8_t *previous_option_number_ptr, uint8_t **dst_pptr,
 * 																	uint16_t *dst_len_ptr, sn_coap_option_numbers_e option, uint16_t option_number_len)
 *
 * \brief Parses CoAP message's Uri-query options
 *
 * \param **packet_data_pptr is source for Packet data to be parsed to CoAP message
 *
 * \param *dst_coap_msg_ptr is destination for parsed CoAP message
 *
 * \param options_count_left tells how many options are unhandled in Packet data
 *
 * \param *previous_option_number_ptr is pointer to used and returned previous Option number
 *
 * \return Return value is count of Uri-query optios parsed. In failure case -1 is returned.
*/

static int8_t sn_coap_parser_options_parse_multiple_options(uint8_t **packet_data_pptr, uint16_t packet_left_len,  uint8_t **dst_pptr, uint16_t *dst_len_ptr, sn_coap_option_numbers_e option, uint16_t option_number_len)
{
    int16_t     uri_query_needed_heap       = sn_coap_parser_options_count_needed_memory_multiple_option(*packet_data_pptr, packet_left_len, option, option_number_len);
    uint8_t    *temp_parsed_uri_query_ptr   = NULL;
    uint8_t     returned_option_counter     = 0;

    if(uri_query_needed_heap == -1)
    	return -1;

    if(uri_query_needed_heap)
    {
    	*dst_pptr = (uint8_t*) sn_coap_malloc(uri_query_needed_heap);

    	if (*dst_pptr == NULL)
    		return -1;
    }

    *dst_len_ptr = uri_query_needed_heap;

   	temp_parsed_uri_query_ptr = *dst_pptr;

    /* Loop all Uri-Query options */
    while ((temp_parsed_uri_query_ptr - *dst_pptr) < uri_query_needed_heap)
    {
        /* Check if this is first Uri-Query option */
        if (returned_option_counter > 0)
        {
            /* Uri-Query is modified to following format: temp1'\0'temp2'\0'temp3 i.e.  */
            /* Uri-Path is modified to following format: temp1\temp2\temp3 i.e.  */
        	if(option == COAP_OPTION_URI_QUERY || option == COAP_OPTION_LOCATION_QUERY || option == COAP_OPTION_ETAG || option == COAP_OPTION_ACCEPT)
            	memset(temp_parsed_uri_query_ptr, '&', 1);
            else if(option == COAP_OPTION_URI_PATH || option == COAP_OPTION_LOCATION_PATH)
            	memset(temp_parsed_uri_query_ptr, '/', 1);

            temp_parsed_uri_query_ptr++;
        }

        returned_option_counter++;

        (*packet_data_pptr)++;

        if(((temp_parsed_uri_query_ptr - *dst_pptr) + option_number_len) > uri_query_needed_heap)
        	return -1;

        memcpy(temp_parsed_uri_query_ptr, *packet_data_pptr, option_number_len);

        (*packet_data_pptr) += option_number_len;
        temp_parsed_uri_query_ptr += option_number_len;

        if(((**packet_data_pptr >> COAP_OPTIONS_OPTION_NUMBER_SHIFT) != 0) || (temp_parsed_uri_query_ptr - *dst_pptr) >= uri_query_needed_heap)
        {
            return returned_option_counter;
        }

        option_number_len = (**packet_data_pptr & 0x0F);
        if(option_number_len == 13)
        {
        	option_number_len = *(*packet_data_pptr+1) + 13;
        	(*packet_data_pptr)++;
        }
        else if(option_number_len == 14)
        {
        	option_number_len = *(*packet_data_pptr+2);
        	option_number_len += (*(*packet_data_pptr+1) << 8) + 269;
        	(*packet_data_pptr) += 2;
        }
    }

    return returned_option_counter;
}




/**
 * \fn static uint16_t sn_coap_parser_options_count_needed_memory_multiple_option(uint8_t *packet_data_ptr, uint8_t options_count_left, uint8_t previous_option_number, sn_coap_option_numbers_e option, uint16_t option_number_len)
 *
 * \brief Counts needed memory for uri query option
 *
 * \param *packet_data_ptr is start of source for Packet data to be parsed to CoAP message
 *
 * \param options_count_left tells how many options are unhandled in Packet data
 *
 * \param previous_option_number is previous Option number
 *
 * \param sn_coap_option_numbers_e option option number to be calculated
 *
 * \param uint16_t option_number_len length of the first option part
 */

static int16_t sn_coap_parser_options_count_needed_memory_multiple_option(uint8_t *packet_data_ptr, uint16_t packet_left_len, sn_coap_option_numbers_e option, uint16_t option_number_len)
{
    uint16_t ret_value              = 0;
    uint16_t i 						= 1;

    /* Loop all Uri-Query options */
    while (i < packet_left_len)
    {
        if(option == COAP_OPTION_LOCATION_PATH && option_number_len > 255)
        	return -1;
        if(option == COAP_OPTION_URI_PATH && option_number_len > 255)
        	return -1;
        if(option == COAP_OPTION_URI_QUERY && option_number_len > 255)
        	return -1;
        if(option == COAP_OPTION_LOCATION_QUERY && option_number_len > 255)
        	return -1;
        if(option == COAP_OPTION_ACCEPT && option_number_len > 2)
        	return -1;
        if(option == COAP_OPTION_ETAG && option_number_len > 8)
        	return -1;

        i += option_number_len;
        ret_value += option_number_len + 1; /* + 1 is for separator */

        if((*(packet_data_ptr + i) >> COAP_OPTIONS_OPTION_NUMBER_SHIFT) != 0)
        {
            if(ret_value != 0)
            	return (ret_value - 1); /* -1 because last Part path does not include separator */
            else
            	return 0;
        }

        option_number_len = (*(packet_data_ptr + i) & 0x0F);

		if (option_number_len == 13)
		{
			i++;
			option_number_len = *(packet_data_ptr + i) + 13;
		}
		else if (option_number_len == 14)
		{
			option_number_len = *(packet_data_ptr + 2);
			option_number_len += (*(packet_data_ptr + 1) << 8) + 269;
			i += 2;
		}
		else if (option_number_len == 15)
			return -1;
		i++;

    }

    if(ret_value != 0)
    	return (ret_value - 1); /* -1 because last Part path does not include separator */
    else
    	return 0;
}

/**
 * \fn static void sn_coap_parser_payload_parse(uint16_t packet_data_len, uint8_t *packet_data_ptr, uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr)
 *
 * \brief Parses CoAP message's Payload part from given Packet data
 *
 * \param packet_data_len is length of given Packet data to be parsed to CoAP message
 *
 * \param *packet_data_ptr is start of source for Packet data to be parsed to CoAP message
 *
 * \param **packet_data_pptr is source for Packet data to be parsed to CoAP message
 *
 * \param *dst_coap_msg_ptr is destination for parsed CoAP message
 *****************************************************************************/

static int8_t sn_coap_parser_payload_parse(uint16_t packet_data_len, uint8_t *packet_data_start_ptr, uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr)
{
    /* If there is payload */
	if((*packet_data_pptr - packet_data_start_ptr) < packet_data_len)
	{
		if(**packet_data_pptr == 0xff)
		{
			(*packet_data_pptr)++;
			/* Parse Payload length */
			dst_coap_msg_ptr->payload_len = packet_data_len - (*packet_data_pptr - packet_data_start_ptr);

			/* The presence of a marker followed by a zero-length payload MUST be processed as a message format error */
			if(dst_coap_msg_ptr->payload_len == 0)
				return -1;

			/* Parse Payload by setting CoAP message's payload_ptr to point Payload in Packet data */
			dst_coap_msg_ptr->payload_ptr = *packet_data_pptr;
		}
		/* No payload marker.. */
		else
			return -1;
	}
	return 0;
}


/**
 * \fn void sn_coap_packet_debug(sn_coap_hdr_s *coap_packet_ptr)
 *
 * \brief Parses CoAP message and prints parts for debugging
 *
 * \param *coap_packet_ptr Pointer to the CoAP message to debug
 *
 *****************************************************************************/

void sn_coap_packet_debug(sn_coap_hdr_s *coap_packet_ptr)
{
#ifdef HAVE_DEBUG
	switch (coap_packet_ptr->msg_type)
	{
		case COAP_MSG_TYPE_CONFIRMABLE:
            printf("con ");
            break;

		case COAP_MSG_TYPE_NON_CONFIRMABLE:
            printf("non ");
            break;

		case COAP_MSG_TYPE_ACKNOWLEDGEMENT:
            printf("ack ");
            break;

		case COAP_MSG_TYPE_RESET:
            printf("rst ");
            break;
	}

	switch (coap_packet_ptr->msg_code)
	{
        case COAP_MSG_CODE_EMPTY:
            printf("NO CODE ");
            break;

        case COAP_MSG_CODE_REQUEST_GET:
            printf("GET ");
            break;

        case COAP_MSG_CODE_REQUEST_POST:
            printf("POST ");
            break;

        case COAP_MSG_CODE_REQUEST_PUT:
            printf("PUT ");
            break;

        case COAP_MSG_CODE_REQUEST_DELETE:
            printf("DELETE ");
            break;

        case COAP_MSG_CODE_RESPONSE_CREATED:
            printf("2.01 Created ");
            break;

        case COAP_MSG_CODE_RESPONSE_DELETED:
            printf("2.02 Deleted ");
            break;

        case COAP_MSG_CODE_RESPONSE_VALID:
            printf("2.03 Valid ");
            break;

        case COAP_MSG_CODE_RESPONSE_CHANGED:
            printf("2.04 Changed ");
            break;

        case COAP_MSG_CODE_RESPONSE_CONTENT:
            printf("2.05 Content ");
            break;

        case COAP_MSG_CODE_RESPONSE_BAD_REQUEST:
            printf("4.00 Bad Request ");
            break;

        case COAP_MSG_CODE_RESPONSE_UNAUTHORIZED:
            printf("4.01 Unauthorized ");
            break;

        case COAP_MSG_CODE_RESPONSE_BAD_OPTION:
            printf("4.02 Bad Option ");
            break;

        case COAP_MSG_CODE_RESPONSE_FORBIDDEN:
            printf("4.03 Forbidden ");
            break;

        case COAP_MSG_CODE_RESPONSE_NOT_FOUND:
            printf("4.04 Not Found ");
            break;

        case COAP_MSG_CODE_RESPONSE_METHOD_NOT_ALLOWED:
            printf("4.05 Method Not Allowed ");
            break;

        case COAP_MSG_CODE_RESPONSE_NOT_ACCEPTABLE:
            printf("4.06 Response Not Acceptable");
            break;

        case COAP_MSG_CODE_RESPONSE_REQUEST_ENTITY_INCOMPLETE:
            printf("4.08 Request Entity Incomplete ");
            break;

        case COAP_MSG_CODE_RESPONSE_PRECONDITION_FAILED:
            printf("4.12 Response Precondition Failed");
            break;

        case COAP_MSG_CODE_RESPONSE_REQUEST_ENTITY_TOO_LARGE:
            printf("4.13 Request Entity Too Large ");
            break;

        case COAP_MSG_CODE_RESPONSE_UNSUPPORTED_CONTENT_FORMAT:
            printf("4.15 Unsupported Media Type ");
            break;

        case COAP_MSG_CODE_RESPONSE_INTERNAL_SERVER_ERROR:
            printf("5.00 Internal Server Error ");
            break;

        case COAP_MSG_CODE_RESPONSE_NOT_IMPLEMENTED:
            printf("5.01 Not Implemented ");
            break;

        case COAP_MSG_CODE_RESPONSE_BAD_GATEWAY:
            printf("5.02 Bad Gateway ");
            break;

        case COAP_MSG_CODE_RESPONSE_SERVICE_UNAVAILABLE:
            printf("5.03 Service Unavailable ");
            break;

        case COAP_MSG_CODE_RESPONSE_GATEWAY_TIMEOUT:
            printf("5.04 Gateway Timeout ");
            break;

        case COAP_MSG_CODE_RESPONSE_PROXYING_NOT_SUPPORTED:
            printf("5.05 Proxying Not Supported ");
            break;

        default:
            printf("UNKNOWN CODE ");
            break;
    }

    printf("mid=%i ", (int)(coap_packet_ptr->msg_id));

	if (coap_packet_ptr->uri_path_ptr)
	{
		int i;
		printf("/");
		for (i=0; i < coap_packet_ptr->uri_path_len; i++) printf("%c", (char)(coap_packet_ptr->uri_path_ptr[i]));
		if (coap_packet_ptr->options_list_ptr && coap_packet_ptr->options_list_ptr->uri_query_ptr)
		{
			printf("?");
			for (i=0; i < coap_packet_ptr->options_list_ptr->uri_query_len; i++) printf("%c", (char)(coap_packet_ptr->options_list_ptr->uri_query_ptr[i]));
		}
		printf(" ");
    }

	if (coap_packet_ptr->token_ptr)
	{
		int i;
		printf("token=0x");
		for (i=0; i < coap_packet_ptr->token_len; i++) printf("%02x", (unsigned char)(coap_packet_ptr->token_ptr[i]));
		printf(" ");
	}

    if (coap_packet_ptr->content_type_ptr)
    {
    	switch (coap_packet_ptr->content_type_ptr[0])
    	{
        	case COAP_CT_TEXT_PLAIN:
        		printf("text/plain ");
        		break;

        	case COAP_CT_LINK_FORMAT:
        		printf("application/link-format ");
        		break;

        	case COAP_CT_XML:
        		printf("application/xml ");
        		break;

        	case COAP_CT_OCTET_STREAM:
        		printf("application/octet-stream ");
        		break;

        	case COAP_CT_EXI:
        	    printf("application/exi ");
        	    break;

        	case COAP_CT_JSON:
        	     printf("application/json ");
        	     break;
        default:
        	printf("uknown type (%i) ", (int)(coap_packet_ptr->content_type_ptr[0]));
        	break;

    	}
    }

	if (coap_packet_ptr->options_list_ptr && coap_packet_ptr->options_list_ptr->location_path_ptr)
	{
		printf("Location: /");
		int i;
		for (i=0; i < coap_packet_ptr->options_list_ptr->location_path_len; i++) printf("%c", (char)(coap_packet_ptr->options_list_ptr->location_path_ptr[i]));
		printf(" ");
	}

    if (coap_packet_ptr->payload_ptr)
    {
		int i;
		printf("'");
		for (i=0; i < coap_packet_ptr->payload_len; i++)
			printf("%c", *(coap_packet_ptr->payload_ptr + i));
		printf("' ");
    }

	printf("\n");
#endif
}