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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* \file cache.c
* \brief Implementation of face cache.
*
* The cache is currently implemented as a list so as not to worry about
* platform-specific implementations (eg missing functions in BSD libC for
* search.h).
*/
#include <math.h> // log2
#include <string.h> // memmove
#include "cache.h"
#define FACE_CACHE_MAX_SIZE_LOG_INIT 0
face_cache_t* face_cache_create() {
face_cache_t* face_cache = malloc(sizeof(face_cache_t));
if (!face_cache) goto ERR_MALLOC;
face_cache->max_size_log = FACE_CACHE_MAX_SIZE_LOG_INIT;
#if (FACE_CACHE_MAX_SIZE_LOG_INIT == 0)
face_cache->faces = NULL;
#else
face_cache->faces = malloc((1 << face_cache->max_size_log) * sizeof(face_t*));
if (!face_cache->faces)
goto ERR_ARRAY :
#endif
face_cache->size = 0;
return face_cache;
#if (FACE_CACHE_MAX_SIZE_LOG_INIT != 0)
ERR_ARRAY:
free(face_cache);
#endif
ERR_MALLOC:
return NULL;
}
void face_cache_free(face_cache_t* face_cache) {
free(face_cache->faces);
free(face_cache);
}
face_t* face_cache_add(face_cache_t* face_cache, face_t* face) {
/* Ensure sufficient space for next addition */
size_t new_size_log = (face_cache->size > 0) ? log2(face_cache->size) + 1 : 0;
if (new_size_log > face_cache->max_size_log) {
face_cache->max_size_log = new_size_log;
face_cache->faces =
realloc(face_cache->faces, (1 << new_size_log) * sizeof(face_t*));
}
if (!face_cache->faces) goto ERR_REALLOC;
face_cache->faces[face_cache->size++] = face;
return face;
ERR_REALLOC:
return NULL;
}
int face_cache_search(face_cache_t* face_cache, face_t* face,
face_cmp_t face_cmp) {
for (int i = 0; i < face_cache->size; i++)
if (face_cmp(face, face_cache->faces[i])) return i;
return -1;
}
/* Remove a single occurrence */
face_t* face_cache_remove(face_cache_t* face_cache, face_t* face) {
int pos = face_cache_search(face_cache, face, face_cmp);
if (pos < 0) return NULL;
/* No need to move memory if last item is removed */
if (pos < face_cache->size)
memmove(face_cache->faces + pos, face_cache->faces + pos + 1,
face_cache->size - pos);
face_cache->size--;
return face;
}
/* TODO : remove by ... */
face_t* face_cache_get_by_id(face_cache_t* face_cache, int id) { return NULL; }
void face_cache_dump(face_cache_t* face_cache) {}
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