lib/vlan-bitmap.h

   1 /* Copyright (c) 2011 Nicira, Inc.
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #ifndef VLAN_BITMAP_H
  17 #define VLAN_BITMAP_H 1
  18
  19 #include <stdbool.h>
  20 #include <stdint.h>
  21 #include "bitmap.h"
  22
  23 /* A "VLAN bitmap" is a 4096-bit bitmap that represents a set.  A 1-bit
  24  * indicates that the respective VLAN is a member of the set, a 0-bit indicates
  25  * that it is not.  There is one wrinkle: NULL is a valid value that indicates
  26  * either that all VLANs are or are not members, depending on the vlan_bitmap.
  27  *
  28  * This is empirically a useful data structure. */
  29
  30 unsigned long *vlan_bitmap_from_array(const int64_t *vlans, size_t n_vlans);
  31 int vlan_bitmap_from_array__(const int64_t *vlans, size_t n_vlans,
  32                              unsigned long int *b);
  33
  34 bool vlan_bitmap_equal(const unsigned long *a, const unsigned long *b);
  35
  36 /* Returns a new copy of 'vlans'. */
  37 static inline unsigned long *
  38 vlan_bitmap_clone(const unsigned long *vlans)
  39 {
  40     return vlans ? bitmap_clone(vlans, 4096) : NULL;
  41 }
  42
  43 #endif /* lib/vlan-bitmap.h */