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  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * SPDX-License-Identifier: GPL-2.0-or-later
  10  */
  11
  12 #ifndef __PPI_GEOLOCATION_COMMON_H
  13 #define __PPI_GEOLOCATION_COMMON_H
  14
  15 #include <inttypes.h>
  16
  17 /*
  18  * Declarations from shared PPI-GEOLOCATION functions.
  19  *
  20  */
  21
  22 /*
  23  * these constants are offsets into base_geotag header, which is bitwise-compatible
  24  * with a radiotap header
  25  */
  26 #define PPI_GEOBASE_MIN_HEADER_LEN  8   /* minimum header length */
  27 #define PPI_GEOBASE_VERSION_OFFSET  0   /* offset of version field */
  28 #define PPI_GEOBASE_LENGTH_OFFSET   2   /* offset of length field */
  29 #define PPI_GEOBASE_PRESENT_OFFSET  4   /* offset of "present" field */
  30 /*
  31  * These BITNO macros were accquired from the radiotap parser. maybe we can share them
  32  * eventually
  33  */
  34 #define BITNO_32(x) (((x) >> 16) ? 16 + BITNO_16((x) >> 16) : BITNO_16((x)))
  35 #define BITNO_16(x) (((x) >> 8) ? 8 + BITNO_8((x) >> 8) : BITNO_8((x)))
  36 #define BITNO_8(x) (((x) >> 4) ? 4 + BITNO_4((x) >> 4) : BITNO_4((x)))
  37 #define BITNO_4(x) (((x) >> 2) ? 2 + BITNO_2((x) >> 2) : BITNO_2((x)))
  38 #define BITNO_2(x) (((x) & 2) ? 1 : 0)
  39 #define BIT(n)  (1 << n)
  40
  41
  42
  43 /*
  44  * Floating point numbers are stored on disk in a handful of fixed-point formats (fixedX_Y)
  45  * designed to preserve the appropriate amount of precision vs range. These functions convert
  46  * the fixedX_Y fixed point values into 'native' doubles for displaying.
  47  * Documentation on these formats can be found in the PPI-GEOLOCATION specification
  48  */
  49 double ppi_fixed3_7_to_double(uint32_t in);
  50 double ppi_fixed3_6_to_double(uint32_t in);
  51 double ppi_fixed6_4_to_double(uint32_t in);
  52 /*
  53  * Some values are encoded as 32-bit unsigned nano-second counters.
  54  * Usually we want to display these values as doubles.
  55  */
  56 double ppi_ns_counter_to_double(uint32_t in);
  57
  58
  59 typedef enum {
  60     PPI_GEOLOCATION_HARRIS   =  0x00485253 /* 00SRH */
  61 } ppi_geolocation_appstr_num;
  62
  63
  64 #endif
  65
  66 /*
  67  * Editor modelines
  68  *
  69  * Local Variables:
  70  * c-basic-offset: 4
  71  * tab-width: 8
  72  * indent-tabs-mode: nil
  73  * End:
  74  *
  75  * ex: set shiftwidth=4 tabstop=8 expandtab:
  76  * :indentSize=4:tabSize=8:noTabs=true:
  77  */
  78
  79