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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* array.c
*
* Copyright (C) 2021 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "compat.h"
#include "util/array.h"
#include "sqfs/error.h"
#include <stdlib.h>
int array_init(array_t *array, size_t size, size_t capacity)
{
size_t total;
memset(array, 0, sizeof(*array));
if (capacity > 0) {
if (SZ_MUL_OV(size, capacity, &total))
return SQFS_ERROR_OVERFLOW;
array->data = malloc(total);
if (array->data == NULL)
return SQFS_ERROR_ALLOC;
}
array->size = size;
array->count = capacity;
return 0;
}
int array_init_copy(array_t *array, const array_t *src)
{
int ret;
ret = array_init(array, src->size, src->used);
if (ret != 0)
return ret;
memcpy(array->data, src->data, src->used * src->size);
array->used = src->used;
return 0;
}
void array_cleanup(array_t *array)
{
free(array->data);
memset(array, 0, sizeof(*array));
}
int array_append(array_t *array, const void *data)
{
size_t new_sz, new_count;
void *new;
if (array->used == array->count) {
if (array->count == 0) {
new_count = 128;
} else {
if (SZ_MUL_OV(array->count, 2, &new_count))
return SQFS_ERROR_ALLOC;
}
if (SZ_MUL_OV(new_count, array->size, &new_sz))
return SQFS_ERROR_ALLOC;
new = realloc(array->data, new_sz);
if (new == NULL)
return SQFS_ERROR_ALLOC;
array->data = new;
array->count = new_count;
}
memcpy((char *)array->data + array->size * array->used,
data, array->size);
array->used += 1;
return 0;
}
int array_set_capacity(array_t *array, size_t capacity)
{
size_t new_sz, new_count;
void *new;
if (capacity <= array->count)
return 0;
if (array->count == 0) {
new_count = 128;
} else {
if (SZ_MUL_OV(array->count, 2, &new_count))
return SQFS_ERROR_ALLOC;
}
while (new_count < capacity) {
if (SZ_MUL_OV(new_count, 2, &new_count))
return SQFS_ERROR_ALLOC;
}
if (SZ_MUL_OV(new_count, array->size, &new_sz))
return SQFS_ERROR_ALLOC;
new = realloc(array->data, new_sz);
if (new == NULL)
return SQFS_ERROR_ALLOC;
array->data = new;
array->count = new_count;
return 0;
}
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