epan/ptvcursor.h

   1 /* ptvcursor.h
   2  *
   3  * Proto Tree TVBuff cursor
   4  * Gilbert Ramirez <gram@alumni.rice.edu>
   5  *
   6  * $Id$
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 2000 Gerald Combs
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  25  */
  26
  27 #ifndef __PTVCURSOR_H__
  28 #define __PTVCURSOR_H__
  29
  30 #include <glib.h>
  31 #include <epan/packet.h>
  32 #include "ws_symbol_export.h"
  33
  34 #define SUBTREE_UNDEFINED_LENGTH -1
  35
  36 typedef struct ptvcursor ptvcursor_t;
  37
  38 /* Allocates an initializes a ptvcursor_t with 3 variables:
  39  * proto_tree, tvbuff, and offset. */
  40 WS_DLL_PUBLIC
  41 ptvcursor_t*
  42 ptvcursor_new(proto_tree* tree, tvbuff_t* tvb, gint offset);
  43
  44 /* Gets data from tvbuff, adds it to proto_tree, increments offset,
  45  * and returns proto_item* */
  46 WS_DLL_PUBLIC
  47 proto_item*
  48 ptvcursor_add(ptvcursor_t* ptvc, int hf, gint length, const guint encoding);
  49
  50
  51 /* Gets data from tvbuff, adds it to proto_tree, *DOES NOT* increment
  52  * offset, and returns proto_item* */
  53 WS_DLL_PUBLIC
  54 proto_item*
  55 ptvcursor_add_no_advance(ptvcursor_t* ptvc, int hf, gint length, const guint encoding);
  56
  57 /* Advance the ptvcursor's offset within its tvbuff without
  58  * adding anything to the proto_tree. */
  59 WS_DLL_PUBLIC
  60 void
  61 ptvcursor_advance(ptvcursor_t* ptvc, gint length);
  62
  63 /* Frees memory for ptvcursor_t, but nothing deeper than that. */
  64 WS_DLL_PUBLIC
  65 void
  66 ptvcursor_free(ptvcursor_t* ptvc);
  67
  68 /* Returns tvbuff. */
  69 WS_DLL_PUBLIC
  70 tvbuff_t*
  71 ptvcursor_tvbuff(ptvcursor_t* ptvc);
  72
  73 /* Returns current offset. */
  74 WS_DLL_PUBLIC
  75 gint
  76 ptvcursor_current_offset(ptvcursor_t* ptvc);
  77
  78 /* Returns the proto_tree* */
  79 WS_DLL_PUBLIC
  80 proto_tree*
  81 ptvcursor_tree(ptvcursor_t* ptvc);
  82
  83 /* Sets a new proto_tree* for the ptvcursor_t */
  84 WS_DLL_PUBLIC
  85 void
  86 ptvcursor_set_tree(ptvcursor_t* ptvc, proto_tree* tree);
  87
  88 /* push a subtree in the tree stack of the cursor */
  89 WS_DLL_PUBLIC
  90 proto_tree*
  91 ptvcursor_push_subtree(ptvcursor_t* ptvc, proto_item* it, gint ett_subtree);
  92
  93 /* pop a subtree in the tree stack of the cursor */
  94 WS_DLL_PUBLIC
  95 void
  96 ptvcursor_pop_subtree(ptvcursor_t* ptvc);
  97
  98 /* Add an item to the tree and create a subtree
  99  * If the length is unknown, length may be defined as SUBTREE_UNDEFINED_LENGTH.
 100  * In this case, when the subtree will be closed, the parent item length will
 101  * be equal to the advancement of the cursor since the creation of the subtree.
 102  */
 103 WS_DLL_PUBLIC
 104 proto_tree*
 105 ptvcursor_add_with_subtree(ptvcursor_t* ptvc, int hfindex, gint length,
 106     const guint encoding, gint ett_subtree);
 107
 108 /* Add a text node to the tree and create a subtree
 109  * If the length is unknown, length may be defined as SUBTREE_UNDEFINED_LENGTH.
 110  * In this case, when the subtree will be closed, the item length will be equal
 111  * to the advancement of the cursor since the creation of the subtree.
 112  */
 113 WS_DLL_PUBLIC
 114 proto_tree*
 115 ptvcursor_add_text_with_subtree(ptvcursor_t* ptvc, gint length,
 116     gint ett_subtree, const char* format, ...);
 117
 118 /* Creates a subtree and adds it to the cursor as the working tree but does not
 119  * save the old working tree */
 120 WS_DLL_PUBLIC
 121 proto_tree*
 122 ptvcursor_set_subtree(ptvcursor_t* ptvc, proto_item* it, gint ett_subtree);
 123
 124 #endif /* __PTVCURSOR_H__ */