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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 vector.c
* \brief Implementation of resizeable static array
*/
#include <assert.h>
#include <stddef.h> // size_t
#include <stdlib.h> // calloc
#include <stdio.h>
#include <hicn/util/vector.h>
#define DEFAULT_VECTOR_SIZE 64
int
_vector_init (void **vector_ptr, size_t elt_size, size_t init_size,
size_t max_size)
{
assert (vector_ptr);
assert (max_size == 0 || init_size < max_size);
if (init_size == 0)
init_size = DEFAULT_VECTOR_SIZE;
*vector_ptr = NULL;
int rc = _vector_resize (vector_ptr, elt_size, init_size);
if (rc < 0)
return -1;
vector_hdr_t *vh = vector_hdr (*vector_ptr);
vh->cur_size = 0;
vh->max_size = max_size;
return 0;
}
void
_vector_free (void **vector_ptr)
{
free (vector_hdr (*vector_ptr));
*vector_ptr = NULL;
}
int
_vector_resize (void **vector_ptr, size_t elt_size, off_t pos)
{
vector_hdr_t *vh;
size_t old_size;
if (*vector_ptr)
{
vh = vector_hdr (*vector_ptr);
old_size = vh->alloc_size;
}
else
{
vh = NULL;
old_size = 0;
}
/* Round the allocated size to the next power of 2 of the requested position
*/
size_t new_size = next_pow2 (pos);
/* Don't grow the vector back */
if (new_size < old_size)
return 0;
/* Don't exceed maximum size (for init, check is done beforehand) */
if (vh && vh->max_size && new_size > vh->max_size)
return -1;
vh = realloc (vh, VECTOR_HDRLEN + new_size * elt_size);
if (!vh)
return -1;
vh->alloc_size = new_size;
/* Zero out the newly allocated memory (except headers) */
memset ((uint8_t *) vh + VECTOR_HDRLEN + old_size * elt_size, 0,
(new_size - old_size) * elt_size);
/* Reassign vector pointer */
*vector_ptr = (uint8_t *) vh + VECTOR_HDRLEN;
return 0;
}
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