epan/dissectors/packet-ppi-geolocation-common.h

   1 /* packet-ppi-geolocation-common.h
   2  * Routines for PPI-GEOLOCATION  dissection
   3  * Copyright 2010, Harris Corp, jellch@harris.com
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #ifndef __PPI_GEOLOCATION_COMMON_H
  27 #define __PPI_GEOLOCATION_COMMON_H
  28
  29 /*
  30  * Declarations from shared PPI-GEOLOCATION functions.
  31  *
  32  */
  33
  34 /*
  35  * these constants are offsets into base_geotag header, which is bitwise-compatible
  36  * with a radiotap header
  37  */
  38 #define PPI_GEOBASE_MIN_HEADER_LEN  8   /* minimum header length */
  39 #define PPI_GEOBASE_VERSION_OFFSET  0   /* offset of version field */
  40 #define PPI_GEOBASE_LENGTH_OFFSET   2   /* offset of length field */
  41 #define PPI_GEOBASE_PRESENT_OFFSET  4   /* offset of "present" field */
  42 /*
  43  * These BITNO macros were accquired from the radiotap parser. maybe we can share them
  44  * eventually
  45  */
  46 #define BITNO_32(x) (((x) >> 16) ? 16 + BITNO_16((x) >> 16) : BITNO_16((x)))
  47 #define BITNO_16(x) (((x) >> 8) ? 8 + BITNO_8((x) >> 8) : BITNO_8((x)))
  48 #define BITNO_8(x) (((x) >> 4) ? 4 + BITNO_4((x) >> 4) : BITNO_4((x)))
  49 #define BITNO_4(x) (((x) >> 2) ? 2 + BITNO_2((x) >> 2) : BITNO_2((x)))
  50 #define BITNO_2(x) (((x) & 2) ? 1 : 0)
  51 #define BIT(n)  (1 << n)
  52
  53
  54
  55 /*
  56  * Floating point numbers are stored on disk in a handful of fixed-point formats (fixedX_Y)
  57  * designed to preserve the appropriate amount of precision vs range. These functions convert
  58  * the fixedX_Y fixed point values into 'native' gdoubles for displaying.
  59  * Documentation on these formats can be found in the PPI-GEOLOCATION specification
  60  */
  61 gdouble ppi_fixed3_7_to_gdouble(guint32 in);
  62 gdouble ppi_fixed3_6_to_gdouble(guint32 in);
  63 gdouble ppi_fixed6_4_to_gdouble(guint32 in);
  64 /*
  65  * Some values are encoded as 32-bit unsigned nano-second counters.
  66  * Usually we want to display these values as doubles.
  67  */
  68 gdouble ppi_ns_counter_to_gdouble(guint32 in);
  69
  70
  71 typedef enum {
  72     PPI_GEOLOCATION_HARRIS   =  0x00485253 /* 00SRH */
  73 } ppi_geolocation_appstr_num;
  74
  75
  76 #endif
  77
  78 /*
  79  * Editor modelines
  80  *
  81  * Local Variables:
  82  * c-basic-offset: 4
  83  * tab-width: 8
  84  * indent-tabs-mode: nil
  85  * End:
  86  *
  87  * ex: set shiftwidth=4 tabstop=8 expandtab:
  88  * :indentSize=4:tabSize=8:noTabs=true:
  89  */
  90
  91