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/* Copyright (c) 2025, Red Hat, Inc.
*
* 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.
*/
#include <config.h>
#include "sparse-array.h"
void
sparse_array_init(struct sparse_array *array, size_t capacity)
{
*array = (struct sparse_array) {
.buffer = xmalloc(sizeof (void *) * capacity),
.capacity = capacity,
};
dynamic_bitmap_alloc(&array->bitmap, capacity);
}
void
sparse_array_destroy(struct sparse_array *array)
{
free(array->buffer);
dynamic_bitmap_free(&array->bitmap);
}
static void
sparse_array_expand(struct sparse_array *array, size_t target)
{
if (target <= array->capacity) {
return;
}
size_t new_capacity =
target <= array->capacity * 2 ?
array->capacity * 2 :
target;
array->buffer = xrealloc(array->buffer, new_capacity * sizeof (void *));
array->capacity = new_capacity;
dynamic_bitmap_realloc(&array->bitmap, new_capacity);
ovs_assert(array->capacity == array->bitmap.capacity);
}
static size_t
sparse_array_add__(struct sparse_array *array, const void *obj, size_t idx)
{
sparse_array_expand(array, idx + 1);
array->buffer[idx] = CONST_CAST(void *, obj);
dynamic_bitmap_set1(&array->bitmap, idx);
return idx;
}
size_t
sparse_array_add(struct sparse_array *array, const void *obj)
{
size_t idx = dynamic_bitmap_scan(&array->bitmap, false, 0);
return sparse_array_add__(array, obj, idx);
}
void *
sparse_array_remove(struct sparse_array *array, size_t idx)
{
if (idx >= array->capacity ||
!dynamic_bitmap_is_set(&array->bitmap, idx)) {
return NULL;
}
void *ret = sparse_array_get(array, idx);
dynamic_bitmap_set0(&array->bitmap, idx);
return ret;
}
void *
sparse_array_add_at(struct sparse_array *array, const void *obj, size_t idx)
{
void *ret;
ret = sparse_array_remove(array, idx);
sparse_array_add__(array, obj, idx);
return ret;
}
void *
sparse_array_get(const struct sparse_array *array, size_t idx)
{
if (idx >= array->capacity ||
!dynamic_bitmap_is_set(&array->bitmap, idx)) {
return NULL;
}
return array->buffer[idx];
}
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