/*

rawdata.c - implementation of the elf_rawdata(3) function.

Copyright (C) 1995 - 2000 Michael Riepe

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>

#ifndef lint

static const char rcsid[] = "@(#) $Id: rawdata.c,v 1.9 2005/05/21 15:39:26 michael Exp $";

#endif /* lint */

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)) {

	elf_assert(sd->sd_magic == DATA_MAGIC);

	elf_assert(sd->sd_scn == scn);

	return &sd->sd_data;

    }

    else if (scn->s_offset < 0 || scn->s_offset > elf->e_size) {

	seterr(ERROR_OUTSIDE);

    }

    else if (scn->s_type != SHT_NOBITS

	    && scn->s_offset + scn->s_size > elf->e_size) {

	seterr(ERROR_TRUNC_SCN);

    }

    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;

	if (scn->s_type != SHT_NOBITS && scn->s_size) {

	    if (!(sd->sd_memdata = (char*)malloc(scn->s_size))) {

		seterr(ERROR_IO_2BIG);

		free(sd);

		return NULL;

	    }

	    else if (elf->e_rawdata) {

		memcpy(sd->sd_memdata, elf->e_rawdata + scn->s_offset, scn->s_size);

	    }

	    else if (!_elf_read(elf, sd->sd_memdata, scn->s_offset, scn->s_size)) {

		free(sd->sd_memdata);

		free(sd);

		return NULL;

	    }

	    sd->sd_data.d_buf = sd->sd_memdata;

	    sd->sd_free_data = 1;

	}

	scn->s_rawdata = sd;

	return &sd->sd_data;

    }

    return NULL;

}