epan/range.h

   1 /* range.h
   2  * Range routines
   3  *
   4  * Dick Gooris <gooris@lucent.com>
   5  * Ulf Lamping <ulf.lamping@web.de>
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * SPDX-License-Identifier: GPL-2.0-or-later
  12  */
  13
  14 #ifndef __RANGE_H__
  15 #define __RANGE_H__
  16
  17 #include <glib.h>
  18 #include "ws_symbol_export.h"
  19 #include <epan/wmem/wmem.h>
  20
  21 #ifdef __cplusplus
  22 extern "C" {
  23 #endif /* __cplusplus */
  24
  25 /** @file
  26  * Range strings a variant of value_strings
  27  */
  28
  29 /**@todo where's the best place for these? */
  30 #define MAX_SCTP_PORT 65535
  31 #define MAX_TCP_PORT 65535
  32 #define MAX_UDP_PORT 65535
  33 #define MAX_DCCP_PORT 65535
  34
  35 typedef struct range_admin_tag {
  36     guint32 low;
  37     guint32 high;
  38 } range_admin_t;
  39 #define RANGE_ADMIN_T_INITIALIZER { 0, 0 }
  40
  41 /** user specified range(s) */
  42 typedef struct epan_range {
  43     guint           nranges;   /**< number of entries in ranges */
  44     range_admin_t   ranges[1]; /**< variable-length array */
  45 } range_t;
  46
  47 /**
  48  * Return value from range_convert_str().
  49  */
  50 typedef enum {
  51     CVT_NO_ERROR,
  52     CVT_SYNTAX_ERROR,
  53     CVT_NUMBER_TOO_BIG
  54 } convert_ret_t;
  55
  56 WS_DLL_PUBLIC range_t *range_empty(wmem_allocator_t *scope);
  57
  58
  59 /*** Converts a range string to a fast comparable array of ranges.
  60  * This function allocates a range_t large enough to hold the number
  61  * of ranges specified, and fills the array range->ranges containing
  62  * low and high values with the number of ranges being range->nranges.
  63  * After having called this function, the function value_is_in_range()
  64  * determines whether a given number is within the range or not.<BR>
  65  * In case of a single number, we make a range where low is equal to high.
  66  * We take care on wrongly entered ranges; opposite order will be taken
  67  * care of.
  68  *
  69  * The following syntax is accepted :
  70  *
  71  *   1-20,30-40     Range from 1 to 20, and packets 30 to 40
  72  *   -20,30         Range from 1 to 20, and packet 30
  73  *   20,30,40-      20, 30, and the range from 40 to the end
  74  *   20-10,30-25    Range from 10 to 20, and from 25 to 30
  75  *   -              All values
  76  * @param scope memory scope for the range
  77  * @param range the range
  78  * @param es points to the string to be converted.
  79  * @param max_value specifies the maximum value in a range.
  80  * @return convert_ret_t
  81  */
  82 WS_DLL_PUBLIC convert_ret_t range_convert_str(wmem_allocator_t *scope, range_t **range, const gchar *es,
  83     guint32 max_value);
  84
  85 WS_DLL_PUBLIC convert_ret_t range_convert_str_work(wmem_allocator_t *scope, range_t **range, const gchar *es,
  86     guint32 max_value, gboolean err_on_max);
  87
  88 /** This function returns TRUE if a given value is within one of the ranges
  89  * stored in the ranges array.
  90  * @param range the range
  91  * @param val the value to check
  92  * @return TRUE if the value is in range
  93  */
  94 WS_DLL_PUBLIC gboolean value_is_in_range(range_t *range, guint32 val);
  95
  96 /** This function returns TRUE if val has successfully been added to
  97  * a range.  This may extend an existing range or create a new one
  98  * @param scope memory scope of range (in case of reallocation)
  99  * @param range to add value
 100  * @param val value to add to range
 101  * @return TRUE if the value is successsfully added to range
 102  */
 103 WS_DLL_PUBLIC gboolean range_add_value(wmem_allocator_t *scope, range_t **range, guint32 val);
 104
 105 /** This function returns TRUE if val has successfully been removed from
 106  * a range.  This may remove an existing range.
 107  * @param scope memory scope of range (in case of reallocation)
 108  * @param range to remove value
 109  * @param val value to remove within range
 110  * @return TRUE if the value is successsfully removed to range
 111  */
 112 WS_DLL_PUBLIC gboolean range_remove_value(wmem_allocator_t *scope, range_t **range, guint32 val);
 113
 114 /** This function returns TRUE if the two given range_t's are equal.
 115  * @param a first range
 116  * @param b second range
 117  * @return TRUE if the value is in range
 118  */
 119 WS_DLL_PUBLIC gboolean ranges_are_equal(range_t *a, range_t *b);
 120
 121 /** This function calls the provided callback function for each value in
 122  * in the range. Takes a pointer argument, which is passed to the
 123  * callback, along with the value in the range.
 124  * @param range the range
 125  * @param callback the callback function
 126  * @param ptr pointer passed to the callback
 127  */
 128 WS_DLL_PUBLIC void range_foreach(range_t *range, void (*callback)(guint32 val, gpointer ptr), gpointer ptr);
 129
 130 /**
 131  * This function converts a range_t to a (wmem_alloc()-allocated) string.
 132  */
 133 WS_DLL_PUBLIC char *range_convert_range(wmem_allocator_t *scope, const range_t *range);
 134
 135 /**
 136  * Create a (wmem-alloc()ed) copy of a range
 137  * @param scope memory scope for the copied range
 138  * @param src the range to copy
 139  * @return ep allocated copy of the range
 140  */
 141 WS_DLL_PUBLIC range_t *range_copy(wmem_allocator_t *scope, range_t *src);
 142
 143 #ifdef __cplusplus
 144 }
 145 #endif /* __cplusplus */
 146
 147 #endif /* __RANGE_H__ */