/*******************************************************************************
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THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE IMPLIED
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        notice, this list of conditions and the following disclaimer in the
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*******************************************************************************/
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include "polarssl/mvMemPool.h"


/*******************************************************************************
*		mpool_get_free_node()
*******************************************************************************/
static pool_node * mpool_get_free_node (pool_head *head)
{
	if (head != 0) {
		register pool_node *node = head->free_list;

		if (node != 0) {
			/* remove first element from the free list */
			head->free_list = node->next;
			/* is it the last free element? */
			if (head->free_list != 0) {
				head->free_list->prev = 0;
			}

			/* put into the busy list */
			node->next = head->busy_list;
			node->prev = 0;
			head->busy_list = node;
			if (node->next != 0) {
				node->next->prev = node;
			}

#ifdef MV_MEMPOOL_STAT
			head->stat.alloc_req++;
			head->stat.allocated++;
			if (head->stat.allocated > head->stat.max_alloc)
				head->stat.max_alloc = head->stat.allocated;
#endif

			return node;
		}
	}

	return 0;
} /* end of get_free_node() */

/*******************************************************************************
*		mpool_free_busy_node()
*******************************************************************************/
static void mpool_free_busy_node (pool_node *node)
{
	if (node != 0) {
		register pool_head *head = node->head;

#ifdef MV_MEMPOOL_STAT
		head->stat.free_req++;
		head->stat.allocated--;
#endif

		/* remove the node from the busy list */
		if (node->next != 0) {
			node->next->prev = node->prev;
		}
		if (node->prev != 0) {
			node->prev->next = node->next;
		}
		if ((node->next == 0) && (node->prev == 0)) {
			head->busy_list = 0;
		}

		/* connect the node to the free list */
		node->next = head->free_list;
		node->prev = 0;
		head->free_list = node;
		if (node->next != 0) {
			node->next->prev = node;
		}
	}
} /* end of free_busy_node() */

/*******************************************************************************
*		mpool_get_heads()
*******************************************************************************/
pool_head * mpool_get_heads (void)
{
	static pool_head heads[NUM_OF_POOLS];

	return heads;
} /* end of mpool_get_heads */

/*******************************************************************************
*		mpool_init()
*******************************************************************************/
pool_head * mpool_init (void)
{
	register int	pn, nn; /* pool number, node number */

	int pool_data_sizes[NUM_OF_POOLS] = {POOL_DATA_SZ_1, POOL_DATA_SZ_2,
										 POOL_DATA_SZ_3, POOL_DATA_SZ_4};

	static unsigned char pool_data_1 [NUM_OF_NODES][POOL_DATA_SZ_1] = {0};
	static unsigned char pool_data_2 [NUM_OF_NODES][POOL_DATA_SZ_2] = {0};
	static unsigned char pool_data_3 [NUM_OF_NODES][POOL_DATA_SZ_3] = {0};
	static unsigned char pool_data_4 [NUM_OF_NODES][POOL_DATA_SZ_4] = {0};

	pool_head *heads = mpool_get_heads();

	memset(heads, 0, NUM_OF_POOLS * sizeof(pool_head));

	for (pn = 0; pn < NUM_OF_POOLS; pn++) {

		heads[pn].busy_list = 0;
		heads[pn].data_sz   = pool_data_sizes[pn];

		for (nn = 0; nn < NUM_OF_NODES; nn++) {
			pool_node	*pooln;

			switch (pn) {
				case 0:
					pooln = (pool_node *)&pool_data_1[nn][0];
					break;
				case 1:
					pooln = (pool_node *)&pool_data_2[nn][0];
					break;
				case 2:
					pooln = (pool_node *)&pool_data_3[nn][0];
					break;
				case 3:
					pooln = (pool_node *)&pool_data_4[nn][0];
					break;
				default:
					return NULL;
			}

			/* last node? */
			if (nn == NUM_OF_NODES - 1) {
				pooln->next = 0;
			} else {
				pooln->next =
					(pool_node *)((unsigned char *)pooln + heads[pn].data_sz);
			}
			/* first node? */
			if (nn == 0) {
				pooln->prev = 0;
				heads[pn].free_list = pooln;
			} else {
				pooln->prev =
					(pool_node *)((unsigned char *)pooln - heads[pn].data_sz);
			}

			pooln->head = &heads[pn];

		} /* for all nodes */
	} /* for all pools */

	return heads;
} /* end of mpool_init() */

/*******************************************************************************
*		mpool_alloc()
*******************************************************************************/
void * mpool_alloc (pool_head *head, int size)
{
	register int	   pn;
	register pool_node *node;

	for (pn = 0; pn < NUM_OF_POOLS; pn++) {
		if (MAX_DATA_SZ(&head[pn]) >= size) {
			node = mpool_get_free_node(&head[pn]);
			if (node != 0) {
				memset(&node->data, 0, MAX_DATA_SZ(node->head));
				return &node->data;
			}
		}
	}

	return 0;
}/* end of mpool_alloc() */

/*******************************************************************************
*		mpool_grow()
*******************************************************************************/
void * mpool_grow (pool_head *head, void *mr, int new_size)
{
	if (mr == 0) {
		/* No data to copy, just allocate it */
		return mpool_alloc(head, new_size);
	} else {
		register pool_node *node =
				(pool_node *)((unsigned char *)mr - offsetof(pool_node, data));

		if (MAX_DATA_SZ(node->head) >= new_size) {
			/* nothing to do, the current memory region is bigh enough */
			return mr;
		} else {
			register void *new_data = mpool_alloc(head, new_size);

			if (new_data != 0) {
				memcpy(new_data, &node->data, MAX_DATA_SZ(node->head));
				memset(&node->data, 0, MAX_DATA_SZ(node->head));
				mpool_free_busy_node(node);
			}
			return new_data;
		}
	}
}/* end of mpool_grow() */

/*******************************************************************************
*		mpool_free()
*******************************************************************************/
void mpool_free (void *mr)
{
	register pool_node *node;

	node = (pool_node *)((unsigned char *)mr - offsetof(pool_node, data));
	memset(&node->data, 0, MAX_DATA_SZ(node->head));

	mpool_free_busy_node(node);
}/* end of mpool_free() */

#ifdef MV_MEMPOOL_STAT
/*******************************************************************************
*		mpool_print_stat()
*******************************************************************************/
void mpool_print_stat (void)
{
	pool_head 	*heads = mpool_get_heads();
	int			i;

	for (i = 0; i < NUM_OF_POOLS; i++)
	{
		printf("Pool sz %d : Allocated: %d; Total alloc %d / free %d; Max alloc %d\n",
			   heads[i].data_sz,  heads[i].stat.allocated, heads[i].stat.alloc_req,
			   heads[i].stat.free_req, heads[i].stat.max_alloc);
	}
}/* end of mpool_print_stat() */

/*******************************************************************************
*		mpool_reset_stat()
*******************************************************************************/
void mpool_reset_stat (void)
{
	pool_head 	*heads = mpool_get_heads();
	int			i;

	for (i = 0; i < NUM_OF_POOLS; i++)
	{
		memset(&heads[i].stat, 0, sizeof(pool_stat));
	}
}/* end of mpool_reset_stat() */

#endif