/* Chrysalide - Outil d'analyse de fichiers binaires
 * form.c - chargement en mémoire des valeurs d'attributs
 *
 * Copyright (C) 2016-2017 Cyrille Bagard
 *
 *  This file is part of Chrysalide.
 *
 *  Chrysalide 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.
 *
 *  Chrysalide 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 Chrysalide.  If not, see <http://www.gnu.org/licenses/>.
 */


#include "form.h"


#include "../dwarf-int.h"
#include "../v2/form.h"



/******************************************************************************
*                                                                             *
*  Paramètres  : format = contenu binaire de débogage à parcourir.            *
*                cu     = unité de compilation parente.                       *
*                form   = nature de la valeur à lire.                         *
*                pos    = tête de lecture au sein des données. [OUT]          *
*                value  = valeur au format donné lue. [OUT]                   *
*                                                                             *
*  Description : Lit la valeur correspondant à un type donné.                 *
*                                                                             *
*  Retour      : Bilan de l'opération.                                        *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

bool read_dwarf_v4_form_value(const GDwarfFormat *format, const dw_compil_unit_header *cu, DwarfForm form, vmpa2t *pos, dw_v4_form_value *value)
{
    bool result;                            /* Bilan de lecture à renvoyer */
    GBinContent *content;                   /* Contenu binaire à parcourir */
    SourceEndian endian;                    /* Boutisme des enregistrements*/
    uint32_t tmp32;                         /* Données sur 32 bits         */
    uint64_t tmp64;                         /* Données sur 64 bits         */
    uleb128_t tmpuleb;                      /* Données sur xxx bits        */

    content = G_BIN_FORMAT(format)->content;
    endian = g_binary_format_get_endianness(G_BIN_FORMAT(format));

    switch (form)
    {
        case DW_FORM_sec_offset:

            if (cu->is_32b)
            {
                    result = g_binary_content_read_u32(content, pos, endian, &tmp32);
                    tmp64 = tmp32;
            }
            else
                result = g_binary_content_read_u64(content, pos, endian, &tmp64);

            value->sec_offset = tmp64;
            break;

        case DW_FORM_exprloc:

            tmpuleb = 0;    /* Pour GCC */

            result = g_binary_content_read_uleb128(content, pos, &tmpuleb);
            if (!result) break;

            value->expr.size = tmpuleb;

            value->expr.start = g_binary_content_get_raw_access(content, pos, value->expr.size);
            result = (value->expr.start != NULL);

            break;

        case DW_FORM_flag_present:
            result = true;
            value->has_flag = true;
            break;

        case DW_FORM_ref_sig8:
            result = g_binary_content_read_u64(content, pos, endian, &value->signature);
            break;

        default:
            result = read_dwarf_v2_form_value(format, cu, form, pos, &value->v2);
            break;

    }

    return result;

}