hashkit.c

/* HashKit
 * Copyright (C) 2006-2009 Brian Aker
 * All rights reserved.
 *
 * Use and distribution licensed under the BSD license.  See
 * the COPYING file in the parent directory for full text.
 */

#include "common.h"

static const hashkit_st global_default_hash= {
  .base_hash= {
    .function= hashkit_one_at_a_time,
    .context= NULL
  },
  .flags= {
    .is_base_same_distributed= false,
  }
};

static inline bool _hashkit_init(hashkit_st *self)
{
  self->base_hash= global_default_hash.base_hash;
  self->distribution_hash= global_default_hash.base_hash;
  self->flags= global_default_hash.flags;

  return true;
}

static inline hashkit_st *_hashkit_create(hashkit_st *self)
{
  if (self == NULL)
  {
    self= (hashkit_st *)malloc(sizeof(hashkit_st));
    if (self == NULL)
    {
      return NULL;
    }

    self->options.is_allocated= true;
  }
  else
  {
    self->options.is_allocated= false;
  }

  return self;
}

hashkit_st *hashkit_create(hashkit_st *self)
{
  self= _hashkit_create(self);
  if (! self)
    return self;

  if (! _hashkit_init(self))
  {
    hashkit_free(self);
  }

  return self;
}


void hashkit_free(hashkit_st *self)
{
  if (hashkit_is_allocated(self))
  {
    free(self);
  }
}

hashkit_st *hashkit_clone(hashkit_st *destination, const hashkit_st *source)
{
  if (source == NULL)
  {
    return hashkit_create(destination);
  }

  /* new_clone will be a pointer to destination */ 
  destination= _hashkit_create(destination);

  // Should only happen on allocation failure.
  if (destination == NULL)
  {
    return NULL;
  }

  destination->base_hash= source->base_hash;
  destination->distribution_hash= source->distribution_hash;
  destination->flags= source->flags;

  return destination;
}

bool hashkit_compare(const hashkit_st *first, const hashkit_st *second)
{
  if (first->base_hash.function == second->base_hash.function &&
      first->base_hash.context == second->base_hash.context &&
      first->distribution_hash.function == second->distribution_hash.function &&
      first->distribution_hash.context == second->distribution_hash.context &&
      first->flags.is_base_same_distributed == second->flags.is_base_same_distributed)
  {
    return true;
  }

  return false;
}