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/* OpenIDA - Outil d'analyse de fichiers binaires
* utils.h - prototypes pour les fonctions d'aisance vis à vis du format DWARF
*
* Copyright (C) 2008 Cyrille Bagard
*
* This file is part of OpenIDA.
*
* OpenIDA is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* OpenIDA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
*/
#include "utils.h"
#include "dwarf-int.h"
/******************************************************************************
* *
* Paramètres : format = informations de débogage à consulter. *
* pos = tête de lecture à mettre à jour. [OUT] *
* value = valeur au format LEB128 lue. [OUT] *
* *
* Description : Lit une valeur Little Endian Base 128 signée. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool read_leb128(dwarf_format *format, off_t *pos, int64_t *value)
{
int shift; /* Décallage à appliquer */
off_t i; /* Boucle de parcours */
*value = 0;
for (i = 0; i < 8; i++)
{
/* On évite les débordements... */
if ((*pos + i) >= DBG_FORMAT(format)->length) return false;
*value |= (DBG_FORMAT(format)->content[*pos + i] & 0x7f) << shift;
shift += 7;
(*pos)++;
if ((DBG_FORMAT(format)->content[*pos] & 0x80) == 0x00) break;
}
if ((shift < 64) && (DBG_FORMAT(format)->content[*pos - 1] & 0x40) == 0x40)
*value |= - (1 << shift);
return (i < 8);
}
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