epan/frequency-utils.h

   1 /* frequency-utils.h
   2  * Frequency conversion utility definitions
   3  *
   4  * $Id$
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 2007 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #ifndef __FREQUENCY_UTILS_H__
  26 #define __FREQUENCY_UTILS_H__
  27
  28 #include "ws_symbol_export.h"
  29
  30 /** @file
  31  * Frequency and channel conversion utilities.
  32  */
  33
  34 /**
  35  * Given a center frequency in MHz, return a channel number.
  36  * @param freq Frequency in MHz.
  37  * @return The equivalent channel or -1 if no match is found.
  38  */
  39 WS_DLL_PUBLIC
  40 gint
  41 ieee80211_mhz_to_chan(guint freq);
  42
  43 /**
  44  * Given a channel number and a band type, return a center frequency.
  45  * @param chan Channel number
  46  * @param is_bg TRUE if the channel is a b/g channel, FALSE otherwise.
  47  * @return The equivalent frequency or 0 if no match is found.
  48  */
  49 WS_DLL_PUBLIC
  50 guint
  51 ieee80211_chan_to_mhz(gint chan, gboolean is_bg);
  52
  53 /**
  54  * Given a frequency in MHz, return a string representation.
  55  * @param freq Frequench in MHz.
  56  * @return A string showing the frequency, channel number, and type.  The string must be freed with g_free() after use.
  57  */
  58 WS_DLL_PUBLIC
  59 gchar*
  60 ieee80211_mhz_to_str(guint freq);
  61
  62 /* Should this be "(freq < 4920)", or something else? */
  63 #define FREQ_IS_BG(freq) (freq <= 2484)
  64
  65 /*
  66  * Editor modelines
  67  *
  68  * Local Variables:
  69  * c-basic-offset: 4
  70  * tab-width: 8
  71  * indent-tabs-mode: nil
  72  * End:
  73  *
  74  * ex: set shiftwidth=4 tabstop=8 expandtab:
  75  * :indentSize=4:tabSize=8:noTabs=true:
  76  */
  77
  78 #endif /* __FREQUENCY_UTILS_H__ */
  79