epan/dwarf.c

   1 /* dwarf.c
   2  * Common DWARF parts
   3  *
   4  * $Id$
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #include "config.h"
  26
  27 #include <epan/tvbuff.h>
  28
  29 gint
  30 dissect_uleb128(tvbuff_t *tvb, gint offset, guint64 *value)
  31 {
  32     guint  start_offset = offset;
  33     guint  shift = 0;
  34     guint8 byte;
  35
  36     *value = 0;
  37
  38     do {
  39         byte = tvb_get_guint8(tvb, offset);
  40         offset += 1;
  41
  42         *value |= (byte & 0x7F) << shift;
  43         shift += 7;
  44     } while (byte & 0x80);
  45
  46     return offset - start_offset;
  47 }
  48
  49 gint
  50 dissect_leb128(tvbuff_t *tvb, gint offset, gint64 *value)
  51 {
  52     guint  start_offset = offset;
  53     guint  shift = 0;
  54     guint8 byte;
  55
  56     *value = 0;
  57
  58     do {
  59         byte = tvb_get_guint8(tvb, offset);
  60         offset += 1;
  61
  62         *value |= (byte & 0x7F) << shift;
  63         shift += 7;
  64     } while (byte & 0x80);
  65
  66     if (shift < 64 && byte & 0x40)
  67         *value |= - (1 << shift);
  68
  69     return offset - start_offset;
  70 }
  71
  72 /*
  73  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
  74  *
  75  * Local variables:
  76  * c-basic-offset: 4
  77  * tab-width: 8
  78  * indent-tabs-mode: nil
  79  * End:
  80  *
  81  * vi: set shiftwidth=4 tabstop=8 expandtab:
  82  * :indentSize=4:tabSize=8:noTabs=true:
  83  */