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/*-
* Copyright (c) 2006 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <ar.h>
#include <libelf.h>
#include "_libelf.h"
int
_libelf_getshnum(Elf *e, void *eh, int ec, size_t *shnum)
{
Elf64_Off off;
Elf_Scn *scn;
void *sh;
size_t n;
if (ec == ELFCLASS32) {
n = ((Elf32_Ehdr *) eh)->e_shnum;
off = (Elf64_Off) ((Elf32_Ehdr *) eh)->e_shoff;
} else {
n = ((Elf64_Ehdr *) eh)->e_shnum;
off = ((Elf64_Ehdr *) eh)->e_shoff;
}
if (n != 0) {
*shnum = n;
return (1);
}
if (off == 0L) {
*shnum = (size_t) 0;
return (1);
}
/*
* If 'e_shnum' is zero and 'e_shoff' is non-zero, the file is
* using extended section numbering, and the true section
* number is kept in the 'sh_size' field of the section header
* at offset SHN_UNDEF.
*/
if ((scn = elf_getscn(e, (size_t) SHN_UNDEF)) == NULL)
return (0);
if ((sh = _libelf_getshdr(scn, ec)) == NULL)
return (0);
if (ec == ELFCLASS32)
*shnum = ((Elf32_Shdr *) sh)->sh_size;
else
*shnum = ((Elf64_Shdr *) sh)->sh_size;
return (1);
}
int
_libelf_setshnum(Elf *e, void *eh, int ec, size_t shnum)
{
Elf_Scn *scn;
void *sh;
if (shnum < SHN_LORESERVE) {
if (ec == ELFCLASS32)
((Elf32_Ehdr *) eh)->e_shnum = shnum;
else
((Elf64_Ehdr *) eh)->e_shnum = shnum;
return (1);
}
if ((scn = elf_getscn(e, (size_t) SHN_UNDEF)) == NULL)
return (0);
if ((sh = _libelf_getshdr(scn, ec)) == NULL)
return (0);
if (ec == ELFCLASS32)
((Elf32_Shdr *) sh)->sh_size = shnum;
else
((Elf64_Shdr *) sh)->sh_size = shnum;
(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
return (1);
}
int
elf_getshnum(Elf *e, size_t *shnum)
{
void *eh;
int ec;
if (e == NULL || e->e_kind != ELF_K_ELF ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
((eh = _libelf_ehdr(e, ec, 0)) == NULL)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
return (_libelf_getshnum(e, eh, ec, shnum));
}
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