/*
rawdata.c - implementation of the elf_rawdata(3) function.
Copyright (C) 1995 Michael Riepe <riepe@ifwsn4.ifw.uni-hannover.de>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <private.h>

Elf_Data*
elf_rawdata(Elf_Scn *scn, Elf_Data *data) {
    Scn_Data *sd;
    Elf *elf;

    if (!scn) {
	return NULL;
    }
    elf_assert(scn->s_magic == SCN_MAGIC);
    elf = scn->s_elf;
    elf_assert(elf);
    elf_assert(elf->e_magic == ELF_MAGIC);
    if (!elf->e_readable) {
	return NULL;
    }
    else if (scn->s_index == SHN_UNDEF || scn->s_type == SHT_NULL) {
	seterr(ERROR_NULLSCN);
    }
    else if (data) {
	return NULL;
    }
    else if ((sd = scn->s_rawdata)) {
	return (Elf_Data*)sd;
    }
    else if (!(sd = (Scn_Data*)malloc(sizeof(*sd)))) {
	seterr(ERROR_MEM_SCNDATA);
    }
    else {
	*sd = _elf_data_init;
	sd->sd_scn = scn;
	sd->sd_freeme = 1;
	sd->sd_data.d_size = scn->s_size;
	sd->sd_data.d_version = _elf_version;
	scn->s_rawdata = sd;
	if (scn->s_offset < 0 || scn->s_offset > elf->e_size) {
	    seterr(ERROR_OUTSIDE);
	}
	else if (scn->s_type == SHT_NOBITS || !scn->s_size) {
	    return (Elf_Data*)sd;
	}
	else if (scn->s_offset + scn->s_size > elf->e_size) {
	    seterr(ERROR_TRUNC_SCN);
	}
	else if ((sd->sd_memdata = _elf_read(elf, NULL, scn->s_offset, scn->s_size))) {
	    sd->sd_data.d_buf = sd->sd_memdata;
	    sd->sd_free_data = 1;
	    return (Elf_Data*)sd;
	}
	scn->s_rawdata = NULL;
	free(sd);
    }
    return NULL;
}