links.h

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 /*
 * Copyright (C) 2013-2015 CESNET
 *
 * LICENSE TERMS
 *
 * Redistribution and use in source and binary forms, with or without
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 *    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 Company nor the names of its contributors
 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * ALTERNATIVELY, provided that this notice is retained in full, this
 * product may be distributed under the terms of the GNU General Public
 * License (GPL) version 2 or later, in which case the provisions
 * of the GPL apply INSTEAD OF those given above.
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 */
#ifndef _UNIREC_LINKS_H_
#define _UNIREC_LINKS_H_

#ifdef __cplusplus
extern "C" {
#endif

#include "inline.h"

#define MAX_LINK_COUNT 64 //since link mask is held by uint64_t

typedef struct {
   unsigned int link_count;
   uint64_t link_mask;
   uint64_t *link_indexes;
} ur_links_t;

ur_links_t *ur_create_links(const char *mask);

void ur_free_links(ur_links_t *links);

INLINE int ur_get_link_index(ur_links_t *links, uint64_t link_bit_field)
{
   unsigned int i;
   for (i = 0; i < links->link_count; ++i) {
      /* search for corresponding value */
      if ((link_bit_field >> links->link_indexes[i]) & 1L) {
         return i;
      }
   }
   /* ERROR */
   return -1;
}

INLINE uint64_t ur_get_link_bit_field_position(ur_links_t *links, unsigned int index)
{
   if (index < links->link_count) {//index have to be from interval 0 - (n-1)
      return links->link_indexes[index];
   } else {
      return 0;//returns 0 on error since no link can possibly have value 1 on
               //position 0 in LINK_BIT_FIELD
   }
}

INLINE uint64_t ur_get_link_mask(ur_links_t *links)
{
   return links->link_mask;
}

INLINE unsigned int ur_get_link_count(ur_links_t *links)
{
   return links->link_count;
}

#ifdef __cplusplus
} // extern "C"
#endif

#endif
// END OF links.h