/*      $NetBSD: gelf_shdr.c,v 1.5 2024/03/03 17:37:34 christos Exp $   */

/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#if HAVE_NBTOOL_CONFIG_H
# include "nbtool_config.h"
#endif

#include <sys/cdefs.h>

#include <assert.h>
#include <gelf.h>
#include <libelf.h>
#include <limits.h>
#include <stdint.h>

#include "_libelf.h"

__RCSID("$NetBSD: gelf_shdr.c,v 1.5 2024/03/03 17:37:34 christos Exp $");
ELFTC_VCSID("Id: gelf_shdr.c 3977 2022-05-01 06:45:34Z jkoshy");

Elf32_Shdr *
elf32_getshdr(Elf_Scn *s)
{
       return (_libelf_getshdr(s, ELFCLASS32));
}

Elf64_Shdr *
elf64_getshdr(Elf_Scn *s)
{
       return (_libelf_getshdr(s, ELFCLASS64));
}

GElf_Shdr *
gelf_getshdr(Elf_Scn *s, GElf_Shdr *d)
{
       int ec;
       void *sh;
       Elf32_Shdr *sh32;
       Elf64_Shdr *sh64;

       if (d == NULL) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (NULL);
       }

       if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL)
               return (NULL);

       ec = s->s_elf->e_class;
       assert(ec == ELFCLASS32 || ec == ELFCLASS64);

       if (ec == ELFCLASS32) {
               sh32 = (Elf32_Shdr *) sh;

               d->sh_name      = sh32->sh_name;
               d->sh_type      = sh32->sh_type;
               d->sh_flags     = (Elf64_Xword) sh32->sh_flags;
               d->sh_addr      = (Elf64_Addr) sh32->sh_addr;
               d->sh_offset    = (Elf64_Off) sh32->sh_offset;
               d->sh_size      = (Elf64_Xword) sh32->sh_size;
               d->sh_link      = sh32->sh_link;
               d->sh_info      = sh32->sh_info;
               d->sh_addralign = (Elf64_Xword) sh32->sh_addralign;
               d->sh_entsize   = (Elf64_Xword) sh32->sh_entsize;
       } else {
               sh64 = (Elf64_Shdr *) sh;
               *d = *sh64;
       }

       return (d);
}

int
gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s)
{
       int ec;
       Elf *e;
       Elf32_Shdr *sh32;


       if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL ||
           e->e_kind != ELF_K_ELF ||
           ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (0);
       }

       if (e->e_cmd == ELF_C_READ) {
               LIBELF_SET_ERROR(MODE, 0);
               return (0);
       }

       (void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);

       if (ec == ELFCLASS64) {
               scn->s_shdr.s_shdr64 = *s;
               return (1);
       }

       sh32 = &scn->s_shdr.s_shdr32;

       sh32->sh_name    =  s->sh_name;
       sh32->sh_type    =  s->sh_type;
       LIBELF_COPY_U32(sh32, s, sh_flags);
       LIBELF_COPY_U32(sh32, s, sh_addr);
       LIBELF_COPY_U32(sh32, s, sh_offset);
       LIBELF_COPY_U32(sh32, s, sh_size);
       sh32->sh_link    =  s->sh_link;
       sh32->sh_info    =  s->sh_info;
       LIBELF_COPY_U32(sh32, s, sh_addralign);
       LIBELF_COPY_U32(sh32, s, sh_entsize);

       return (1);
}