/* Copyright (c) 2017-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"

#include "memarea.h"

struct memarea {

  const void *data;

  size_t size;

  memarea_free_callback_t *callback;

  void *context;

  int refcount;

};

static struct memarea memarea_empty = {

  .refcount = 1,

};

#undef memarea_init

struct memarea *

memarea_init(const void *data, size_t size,

       memarea_free_callback_t *callback, void *context)

{

  struct memarea *area;

  i_assert(callback != NULL);

  area = i_new(struct memarea, 1);

  area->data = data;

  area->size = size;

  area->callback = callback;

  area->context = context;

  area->refcount = 1;

  return area;

}

struct memarea *memarea_init_empty(void)

{

  i_assert(memarea_empty.refcount > 0);

  memarea_empty.refcount++;

  return &memarea_empty;

}

void memarea_ref(struct memarea *area)

{

  i_assert(area->refcount > 0);

  area->refcount++;

}

void memarea_unref(struct memarea **_area)

{

  struct memarea *area = *_area;

  *_area = NULL;

  i_assert(area->refcount > 0);

  if (--area->refcount > 0)

    return;

  i_assert(area != &memarea_empty);

  area->callback(area->context);

  i_free(area);

}

void memarea_free_without_callback(struct memarea **_area)

{

  struct memarea *area = *_area;

  *_area = NULL;

  i_assert(memarea_get_refcount(area) == 1);

  i_free(area);

}

unsigned int memarea_get_refcount(struct memarea *area)

{

  i_assert(area->refcount > 0);

  return area->refcount;

}

const void *memarea_get(struct memarea *area, size_t *size_r)

{

  *size_r = area->size;

  return area->data;

}

size_t memarea_get_size(struct memarea *area)

{

  return area->size;

}

void memarea_free_callback_noop(void *context ATTR_UNUSED)

{

}