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#include "goomsl_heap.h"
#include <stdlib.h>
struct _GOOM_HEAP
{
void **arrays;
int number_of_arrays;
int size_of_each_array;
int consumed_in_last_array;
};
/* Constructors / Destructor */
GoomHeap *
goom_heap_new (void)
{
return goom_heap_new_with_granularity (4096);
}
GoomHeap *
goom_heap_new_with_granularity (int granularity)
{
GoomHeap *_this;
_this = (GoomHeap *) malloc (sizeof (GoomHeap));
_this->number_of_arrays = 0;
_this->size_of_each_array = granularity;
_this->consumed_in_last_array = 0;
_this->arrays = (void **) malloc (sizeof (void *));
return _this;
}
void
goom_heap_delete (GoomHeap * _this)
{
int i;
for (i = 0; i < _this->number_of_arrays; ++i) {
free (_this->arrays[i]);
}
free (_this->arrays);
free (_this);
}
static void
align_it (GoomHeap * _this, int alignment)
{
if ((alignment > 1) && (_this->number_of_arrays > 0)) {
void *last_array = _this->arrays[_this->number_of_arrays - 1];
long last_address = (long) last_array + _this->consumed_in_last_array;
long decal = (last_address % alignment);
if (decal != 0) {
_this->consumed_in_last_array += alignment - decal;
}
}
}
void *
goom_heap_malloc_with_alignment_prefixed (GoomHeap * _this, int nb_bytes,
int alignment, int prefix_bytes)
{
void *retval = NULL;
/* d'abord on gere les problemes d'alignement */
_this->consumed_in_last_array += prefix_bytes;
align_it (_this, alignment);
/* ensuite on verifie que la quantite de memoire demandee tient dans le buffer */
if ((_this->consumed_in_last_array + nb_bytes >= _this->size_of_each_array)
|| (_this->number_of_arrays == 0)) {
if (prefix_bytes + nb_bytes + alignment >= _this->size_of_each_array) {
/* Si la zone demandee est plus grosse que la granularitee */
/* On alloue un buffer plus gros que les autres */
_this->arrays =
(void **) realloc (_this->arrays,
sizeof (void *) * (_this->number_of_arrays + 2));
_this->number_of_arrays += 1;
_this->consumed_in_last_array = prefix_bytes;
_this->arrays[_this->number_of_arrays - 1] =
malloc (prefix_bytes + nb_bytes + alignment);
align_it (_this, alignment);
retval =
(void *) ((char *) _this->arrays[_this->number_of_arrays - 1] +
_this->consumed_in_last_array);
/* puis on repart sur un nouveau buffer vide */
_this->number_of_arrays += 1;
_this->consumed_in_last_array = 0;
_this->arrays[_this->number_of_arrays - 1] =
malloc (_this->size_of_each_array);
return retval;
} else {
_this->number_of_arrays += 1;
_this->consumed_in_last_array = prefix_bytes;
_this->arrays =
(void **) realloc (_this->arrays,
sizeof (void *) * _this->number_of_arrays);
_this->arrays[_this->number_of_arrays - 1] =
malloc (_this->size_of_each_array);
align_it (_this, alignment);
}
}
retval =
(void *) ((char *) _this->arrays[_this->number_of_arrays - 1] +
_this->consumed_in_last_array);
_this->consumed_in_last_array += nb_bytes;
return retval;
}
void *
goom_heap_malloc_with_alignment (GoomHeap * _this, int nb_bytes, int alignment)
{
return goom_heap_malloc_with_alignment_prefixed (_this, nb_bytes, alignment,
0);
}
void *
goom_heap_malloc (GoomHeap * _this, int nb_bytes)
{
return goom_heap_malloc_with_alignment (_this, nb_bytes, 1);
}
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