/*

 * gelfphdr.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: gelfphdr.c,v 1.8 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_Phdr*

gelf_getphdr(Elf *elf, int ndx, GElf_Phdr *dst) {

    GElf_Phdr buf;

    char *tmp;

    size_t n;

    if (!elf) {

	return NULL;

    }

    elf_assert(elf->e_magic == ELF_MAGIC);

    tmp = _elf_getphdr(elf, elf->e_class);

    if (!tmp) {

	return NULL;

    }

    if (ndx < 0 || ndx >= elf->e_phnum) {

	seterr(ERROR_BADINDEX);

	return NULL;

    }

    n = _msize(elf->e_class, _elf_version, ELF_T_PHDR);

    if (n == 0) {

	seterr(ERROR_UNIMPLEMENTED);

	return NULL;

    }

    if (!dst) {

	dst = &buf;

    }

    if (elf->e_class == ELFCLASS64) {

	*dst = *(Elf64_Phdr*)(tmp + ndx * n);

    }

    else if (elf->e_class == ELFCLASS32) {

	Elf32_Phdr *src = (Elf32_Phdr*)(tmp + ndx * n);

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

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

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

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

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

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

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

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

    }

    else {

	if (valid_class(elf->e_class)) {

	    seterr(ERROR_UNIMPLEMENTED);

	}

	else {

	    seterr(ERROR_UNKNOWN_CLASS);

	}

	return NULL;

    }

    if (dst == &buf) {

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

	if (!dst) {

	    seterr(ERROR_MEM_PHDR);

	    return NULL;

	}

	*dst = buf;

    }

    return dst;

}

int

gelf_update_phdr(Elf *elf, int ndx, GElf_Phdr *src) {

    char *tmp;

    size_t n;

    if (!elf || !src) {

	return 0;

    }

    elf_assert(elf->e_magic == ELF_MAGIC);

    tmp = _elf_getphdr(elf, elf->e_class);

    if (!tmp) {

	return 0;

    }

    if (ndx < 0 || ndx >= elf->e_phnum) {

	seterr(ERROR_BADINDEX);

	return 0;

    }

    n = _msize(elf->e_class, _elf_version, ELF_T_PHDR);

    if (n == 0) {

	seterr(ERROR_UNIMPLEMENTED);

	return 0;

    }

    if (elf->e_class == ELFCLASS64) {

	*(Elf64_Phdr*)(tmp + ndx * n) = *src;

    }

    else if (elf->e_class == ELFCLASS32) {

	Elf32_Phdr *dst = (Elf32_Phdr*)(tmp + ndx * n);

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

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

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

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

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

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

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

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

    }

    else {

	if (valid_class(elf->e_class)) {

	    seterr(ERROR_UNIMPLEMENTED);

	}

	else {

	    seterr(ERROR_UNKNOWN_CLASS);

	}

	return 0;

    }

    return 1;

}

#endif /* __LIBELF64 */