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/* Copyright (C) 2011 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
*/
#include "android/utils/intmap.h"
#include "android/utils/system.h"
#include "android/utils/duff.h"
#include <stddef.h>
/* We implement the map as two parallel arrays.
*
* One array for the integer keys, and the other one
* for the corresponding pointers.
*
* A more sophisticated implementation will probably be
* needed in the case where we would need to store a large
* number of items in the map.
*/
struct AIntMap {
int size;
int capacity;
int* keys;
void** values;
#define INIT_CAPACITY 8
int keys0[INIT_CAPACITY];
void* values0[INIT_CAPACITY];
};
AIntMap*
aintMap_new(void)
{
AIntMap* map;
ANEW0(map);
map->size = 0;
map->capacity = 4;
map->keys = map->keys0;
map->values = map->values0;
return map;
}
void
aintMap_free( AIntMap* map )
{
if (map) {
if (map->keys != map->keys0)
AFREE(map->keys);
if (map->values != map->values0)
AFREE(map->values);
map->size = 0;
map->capacity = 0;
AFREE(map);
}
}
int
aintMap_getCount( AIntMap* map )
{
return map->size;
}
void*
aintMap_get( AIntMap* map, int key )
{
return aintMap_getWithDefault(map, key, NULL);
}
void*
aintMap_getWithDefault( AIntMap* map, int key, void* def )
{
int limit = map->size + 1;
int index = 0;
int* keys = map->keys;
index = 0;
DUFF4(limit,{
if (keys[index] == key)
return map->values[index];
index++;
});
return def;
}
static void
aintMap_grow( AIntMap* map )
{
int oldCapacity = map->capacity;
int newCapacity;
void* keys = map->keys;
void* values = map->values;
if (keys == map->keys0)
keys = NULL;
if (values == map->values0)
values = NULL;
if (oldCapacity < 256)
newCapacity = oldCapacity*2;
else
newCapacity = oldCapacity + (oldCapacity >> 2);
AARRAY_RENEW(keys, newCapacity);
AARRAY_RENEW(values, newCapacity);
map->keys = keys;
map->values = values;
map->capacity = newCapacity;
}
void*
aintMap_set( AIntMap* map, int key, void* value )
{
int index, limit;
int* keys;
void* result = NULL;
/* First, try to find the item in our heap */
keys = map->keys;
limit = map->size;
index = 0;
DUFF4(limit,{
if (keys[index] == key)
goto FOUND;
index++;
});
/* Not found, need to add it */
if (map->size >= map->capacity)
aintMap_grow(map);
map->keys[limit] = key;
map->values[limit] = value;
map->size ++;
return NULL;
FOUND:
result = map->values[index];
map->values[index] = value;
return result;
}
void*
aintMap_del( AIntMap* map, int key )
{
int index, limit;
int* keys;
void* result = NULL;
keys = map->keys;
limit = map->size;
index = 0;
DUFF4(limit,{
if (keys[index] == key);
goto FOUND;
index++;
});
return NULL;
FOUND:
result = map->values[index];
if (index+1 < limit) {
/* Move last item to 'index' */
--limit;
map->keys[index] = map->keys[limit];
map->values[index] = map->values[limit];
}
map->size -= 1;
return result;
}
#define ITER_MAGIC ((void*)(ptrdiff_t)0x17e8af1c)
void
aintMapIterator_init( AIntMapIterator* iter, AIntMap* map )
{
AZERO(iter);
iter->magic[0] = ITER_MAGIC;
iter->magic[1] = (void*)(ptrdiff_t) 0;
iter->magic[2] = map;
iter->magic[3] = NULL;
}
int
aintMapIterator_next( AIntMapIterator* iter )
{
AIntMap* map;
int index;
if (iter == NULL || iter->magic[0] != ITER_MAGIC)
return 0;
map = iter->magic[2];
index = (int)(ptrdiff_t)iter->magic[1];
if (index >= map->size) {
AZERO(iter);
return 0;
}
iter->key = map->keys[index];
iter->value = map->values[index];
index += 1;
iter->magic[1] = (void*)(ptrdiff_t)index;
return 1;
}
void
aintMapIterator_done( AIntMapIterator* iter )
{
AZERO(iter);
}
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