contrib/bind-9.5.2/lib/dns/include/dns/fixedname.h

   1 /*
   2  * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: fixedname.h,v 1.19 2007/06/19 23:47:16 tbox Exp $ */
  19
  20 #ifndef DNS_FIXEDNAME_H
  21 #define DNS_FIXEDNAME_H 1
  22
  23 /*****
  24  ***** Module Info
  25  *****/
  26
  27 /*! \file dns/fixedname.h
  28  * \brief
  29  * Fixed-size Names
  30  *
  31  * dns_fixedname_t is a convenience type containing a name, an offsets table,
  32  * and a dedicated buffer big enough for the longest possible name.
  33  *
  34  * MP:
  35  *\li   The caller must ensure any required synchronization.
  36  *
  37  * Reliability:
  38  *\li   No anticipated impact.
  39  *
  40  * Resources:
  41  *\li   Per dns_fixedname_t:
  42  *\code
  43  *              sizeof(dns_name_t) + sizeof(dns_offsets_t) +
  44  *              sizeof(isc_buffer_t) + 255 bytes + structure padding
  45  *\endcode
  46  *
  47  * Security:
  48  *\li   No anticipated impact.
  49  *
  50  * Standards:
  51  *\li   None.
  52  */
  53
  54 /*****
  55  ***** Imports
  56  *****/
  57
  58 #include <isc/buffer.h>
  59
  60 #include <dns/name.h>
  61
  62 /*****
  63  ***** Types
  64  *****/
  65
  66 struct dns_fixedname {
  67         dns_name_t                      name;
  68         dns_offsets_t                   offsets;
  69         isc_buffer_t                    buffer;
  70         unsigned char                   data[DNS_NAME_MAXWIRE];
  71 };
  72
  73 #define dns_fixedname_init(fn) \
  74         do { \
  75                 dns_name_init(&((fn)->name), (fn)->offsets); \
  76                 isc_buffer_init(&((fn)->buffer), (fn)->data, \
  77                                   DNS_NAME_MAXWIRE); \
  78                 dns_name_setbuffer(&((fn)->name), &((fn)->buffer)); \
  79         } while (0)
  80
  81 #define dns_fixedname_invalidate(fn) \
  82         dns_name_invalidate(&((fn)->name))
  83
  84 #define dns_fixedname_name(fn)          (&((fn)->name))
  85
  86 #endif /* DNS_FIXEDNAME_H */