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#include "mvCommon.h"
#include "mvOs.h"
#include "mvLru.h"
/* LRU Cache support */

/* Init LRU cache database */
MV_LRU_CACHE *mvLruCacheInit(int numOfEntries)
{
	int i;
	MV_LRU_CACHE *pLruCache;

	pLruCache = mvOsMalloc(sizeof(MV_LRU_CACHE));

	if (pLruCache == NULL)
		return NULL;

	memset(pLruCache, 0, sizeof(MV_LRU_CACHE));

	pLruCache->table = mvOsMalloc(numOfEntries * sizeof(MV_LRU_ENTRY));
	if (pLruCache->table == NULL) {
		mvOsFree(pLruCache);
		return NULL;
	}
	memset(pLruCache->table, 0, numOfEntries * sizeof(MV_LRU_ENTRY));
	pLruCache->tableSize = numOfEntries;

	for (i = 0; i < numOfEntries; i++) {
		pLruCache->table[i].next = i + 1;
		pLruCache->table[i].prev = i - 1;
	}
	pLruCache->least = 0;
	pLruCache->most = numOfEntries - 1;

	return pLruCache;
}

void mvLruCacheFinish(MV_LRU_CACHE *pLruCache)
{
	mvOsFree(pLruCache->table);
	mvOsFree(pLruCache);
}

/* Update LRU cache database after using cache Index */
void mvLruCacheIdxUpdate(MV_LRU_CACHE *pLruHndl, int cacheIdx)
{
	int prev, next;

	if (cacheIdx == pLruHndl->most)
		return;

	next = pLruHndl->table[cacheIdx].next;
	if (cacheIdx == pLruHndl->least) {
		pLruHndl->least = next;
	} else {
		prev = pLruHndl->table[cacheIdx].prev;

		pLruHndl->table[next].prev = prev;
		pLruHndl->table[prev].next = next;
	}

	pLruHndl->table[pLruHndl->most].next = cacheIdx;
	pLruHndl->table[cacheIdx].prev = pLruHndl->most;
	pLruHndl->most = cacheIdx;
}

/* Delete LRU cache entry */
void mvLruCacheIdxDelete(MV_LRU_CACHE *pLruHndl, int cacheIdx)
{
	int prev, next;

	if (cacheIdx == pLruHndl->least)
		return;

	prev = pLruHndl->table[cacheIdx].prev;
	if (cacheIdx == pLruHndl->most) {
		pLruHndl->most = prev;
	} else {
		next = pLruHndl->table[cacheIdx].next;

		pLruHndl->table[next].prev = prev;
		pLruHndl->table[prev].next = next;
	}
	pLruHndl->table[pLruHndl->least].prev = cacheIdx;
	pLruHndl->table[cacheIdx].next = pLruHndl->least;
	pLruHndl->least = cacheIdx;
}