epan/tvbuff-int.h

   1 /* tvbuff-int.h
   2  *
   3  * Structures that most TVB users should not be accessing directly.
   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
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (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
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #ifndef __TVBUFF_INT_H__
  27 #define __TVBUFF_INT_H__
  28
  29 struct tvbuff;
  30
  31 struct tvb_ops {
  32         gsize tvb_size;
  33         void (*tvb_free)(struct tvbuff *tvb);
  34         guint (*tvb_offset)(const struct tvbuff *tvb, guint counter);
  35         const guint8 *(*tvb_get_ptr)(struct tvbuff *tvb, guint abs_offset, guint abs_length);
  36         void *(*tvb_memcpy)(struct tvbuff *tvb, void *target, guint offset, guint length);
  37
  38         gint (*tvb_find_guint8)(tvbuff_t *tvb, guint abs_offset, guint limit, guint8 needle);
  39         gint (*tvb_pbrk_guint8)(tvbuff_t *tvb, guint abs_offset, guint limit, const guint8 *needles, guchar *found_needle);
  40
  41         tvbuff_t *(*tvb_clone)(tvbuff_t *tvb, guint abs_offset, guint abs_length);
  42 };
  43
  44 /*
  45  * Tvbuff flags.
  46  */
  47 #define TVBUFF_FRAGMENT         0x00000001      /* this is a fragment */
  48
  49 struct tvbuff {
  50         /* Doubly linked list pointers */
  51         tvbuff_t                *next;
  52
  53         /* Record-keeping */
  54         const struct tvb_ops   *ops;
  55         gboolean                initialized;
  56         guint                   flags;
  57         struct tvbuff           *ds_tvb;  /**< data source top-level tvbuff */
  58
  59         /** We're either a TVBUFF_REAL_DATA or a
  60          * TVBUFF_SUBSET that has a backing buffer that
  61          * has real_data != NULL, or a TVBUFF_COMPOSITE
  62          * which has flattened its data due to a call
  63          * to tvb_get_ptr().
  64          */
  65         const guint8            *real_data;
  66
  67         /** Length of virtual buffer (and/or real_data). */
  68         guint                   length;
  69
  70         /** Reported length. */
  71         guint                   reported_length;
  72
  73         /* Offset from beginning of first TVBUFF_REAL. */
  74         gint                    raw_offset;
  75 };
  76
  77 WS_DLL_PUBLIC tvbuff_t *tvb_new(const struct tvb_ops *ops);
  78
  79 tvbuff_t *tvb_new_proxy(tvbuff_t *backing);
  80
  81 void tvb_add_to_chain(tvbuff_t *parent, tvbuff_t *child);
  82
  83 guint tvb_offset_from_real_beginning_counter(const tvbuff_t *tvb, const guint counter);
  84
  85 void tvb_check_offset_length(const tvbuff_t *tvb, const gint offset, gint const length_val, guint *offset_ptr, guint *length_ptr);
  86 #endif