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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];
int last_address = (int)last_array + _this->consumed_in_last_array;
int 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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