/*

 * gelfshdr.c - gelf_* translation functions.

 * Copyright (C) 2000 - 2006 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>

#if __LIBELF64

#ifndef lint

static const char rcsid[] = "@(#) $Id: gelfshdr.c,v 1.9 2006/07/07 22:16:43 michael Exp $";

#endif /* lint */

#define check_and_copy(type, d, s, name, eret)		\

    do {						\

	if (sizeof((d)->name) < sizeof((s)->name)	\

	 && (type)(s)->name != (s)->name) {		\

	    seterr(ERROR_BADVALUE);			\

	    return (eret);				\

	}						\

	(d)->name = (type)(s)->name;			\

    } while (0)

GElf_Shdr*

gelf_getshdr(Elf_Scn *scn, GElf_Shdr *dst) {

    GElf_Shdr buf;

    if (!scn) {

	return NULL;

    }

    elf_assert(scn->s_magic == SCN_MAGIC);

    elf_assert(scn->s_elf);

    elf_assert(scn->s_elf->e_magic == ELF_MAGIC);

    if (!dst) {

	dst = &buf;

    }

    if (scn->s_elf->e_class == ELFCLASS64) {

	*dst = scn->s_shdr64;

    }

    else if (scn->s_elf->e_class == ELFCLASS32) {

	Elf32_Shdr *src = &scn->s_shdr32;

	check_and_copy(GElf_Word,  dst, src, sh_name,      NULL);

	check_and_copy(GElf_Word,  dst, src, sh_type,      NULL);

	check_and_copy(GElf_Xword, dst, src, sh_flags,     NULL);

	check_and_copy(GElf_Addr,  dst, src, sh_addr,      NULL);

	check_and_copy(GElf_Off,   dst, src, sh_offset,    NULL);

	check_and_copy(GElf_Xword, dst, src, sh_size,      NULL);

	check_and_copy(GElf_Word,  dst, src, sh_link,      NULL);

	check_and_copy(GElf_Word,  dst, src, sh_info,      NULL);

	check_and_copy(GElf_Xword, dst, src, sh_addralign, NULL);

	check_and_copy(GElf_Xword, dst, src, sh_entsize,   NULL);

    }

    else {

	if (valid_class(scn->s_elf->e_class)) {

	    seterr(ERROR_UNIMPLEMENTED);

	}

	else {

	    seterr(ERROR_UNKNOWN_CLASS);

	}

	return NULL;

    }

    if (dst == &buf) {

	dst = (GElf_Shdr*)malloc(sizeof(GElf_Shdr));

	if (!dst) {

	    seterr(ERROR_MEM_SHDR);

	    return NULL;

	}

	*dst = buf;

    }

    return dst;

}

int

gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *src) {

    if (!scn || !src) {

	return 0;

    }

    elf_assert(scn->s_magic == SCN_MAGIC);

    elf_assert(scn->s_elf);

    elf_assert(scn->s_elf->e_magic == ELF_MAGIC);

    if (scn->s_elf->e_class == ELFCLASS64) {

	scn->s_shdr64 = *src;

    }

    else if (scn->s_elf->e_class == ELFCLASS32) {

	Elf32_Shdr *dst = &scn->s_shdr32;

	check_and_copy(Elf32_Word, dst, src, sh_name,      0);

	check_and_copy(Elf32_Word, dst, src, sh_type,      0);

	check_and_copy(Elf32_Word, dst, src, sh_flags,     0);

	check_and_copy(Elf32_Addr, dst, src, sh_addr,      0);

	check_and_copy(Elf32_Off,  dst, src, sh_offset,    0);

	check_and_copy(Elf32_Word, dst, src, sh_size,      0);

	check_and_copy(Elf32_Word, dst, src, sh_link,      0);

	check_and_copy(Elf32_Word, dst, src, sh_info,      0);

	check_and_copy(Elf32_Word, dst, src, sh_addralign, 0);

	check_and_copy(Elf32_Word, dst, src, sh_entsize,   0);

    }

    else {

	if (valid_class(scn->s_elf->e_class)) {

	    seterr(ERROR_UNIMPLEMENTED);

	}

	else {

	    seterr(ERROR_UNKNOWN_CLASS);

	}

	return 0;

    }

    return 1;

}

#endif /* __LIBELF64 */