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/* Copyright (c) 2011 Nicira, 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 "vlan-bitmap.h"
/* Allocates and returns a new 4096-bit bitmap that has 1-bit in positions in
* the 'n_vlans' bits indicated in 'vlans' and 0-bits everywhere else. Returns
* a null pointer if there are no (valid) VLANs in 'vlans'. */
unsigned long *
vlan_bitmap_from_array(const int64_t *vlans, size_t n_vlans)
{
unsigned long *b;
if (!n_vlans) {
return NULL;
}
b = bitmap_allocate(4096);
if (!vlan_bitmap_from_array__(vlans, n_vlans, b)) {
free(b);
return NULL;
}
return b;
}
/* Adds to 4096-bit VLAN bitmap 'b' a 1-bit in each position in the 'n_vlans'
* bits indicated in 'vlans'. Returns the number of 1-bits added to 'b'. */
int
vlan_bitmap_from_array__(const int64_t *vlans, size_t n_vlans,
unsigned long int *b)
{
size_t i;
int n;
n = 0;
for (i = 0; i < n_vlans; i++) {
int64_t vlan = vlans[i];
if (vlan >= 0 && vlan < 4096 && !bitmap_is_set(b, vlan)) {
bitmap_set1(b, vlan);
n++;
}
}
return n;
}
/* Returns true if 'a' and 'b' are the same: either both null or both the same
* 4096-bit bitmap.
*
* (We assume that a nonnull bitmap is not all 0-bits.) */
bool
vlan_bitmap_equal(const unsigned long *a, const unsigned long *b)
{
return (!a && !b) || (a && b && bitmap_equal(a, b, 4096));
}
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