libelf/gelf_fsize.c

/* Return the size of an object file type.
   Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc.
   Written by Ulrich Drepper <drepper@redhat.com>, 1998.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, version 2.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <gelf.h>
#include <stddef.h>

#include "libelfP.h"


/* These are the sizes for all the known types.  */
const size_t __libelf_type_sizes[EV_NUM - 1][ELFCLASSNUM - 1][ELF_T_NUM] =
{
  /* We have no entry for EV_NONE siince we have to set an error.  */
  [EV_CURRENT - 1] = {
    [ELFCLASS32 - 1] = {
#define TYPE_SIZES(LIBELFBITS) \
      [ELF_T_ADDR]	= ELFW2(LIBELFBITS, FSZ_ADDR),			      \
      [ELF_T_OFF]	= ELFW2(LIBELFBITS, FSZ_OFF),			      \
      [ELF_T_BYTE]	= 1,						      \
      [ELF_T_HALF]	= ELFW2(LIBELFBITS, FSZ_HALF),			      \
      [ELF_T_WORD]	= ELFW2(LIBELFBITS, FSZ_WORD),			      \
      [ELF_T_SWORD]	= ELFW2(LIBELFBITS, FSZ_SWORD),			      \
      [ELF_T_XWORD]	= ELFW2(LIBELFBITS, FSZ_XWORD),			      \
      [ELF_T_SXWORD]	= ELFW2(LIBELFBITS, FSZ_SXWORD),		      \
      [ELF_T_EHDR]	= sizeof (ElfW2(LIBELFBITS, Ext_Ehdr)),		      \
      [ELF_T_SHDR]	= sizeof (ElfW2(LIBELFBITS, Ext_Shdr)),		      \
      [ELF_T_SYM]	= sizeof (ElfW2(LIBELFBITS, Ext_Sym)),		      \
      [ELF_T_REL]	= sizeof (ElfW2(LIBELFBITS, Ext_Rel)),		      \
      [ELF_T_RELA]	= sizeof (ElfW2(LIBELFBITS, Ext_Rela)),		      \
      [ELF_T_PHDR]	= sizeof (ElfW2(LIBELFBITS, Ext_Phdr)),		      \
      [ELF_T_DYN]	= sizeof (ElfW2(LIBELFBITS, Ext_Dyn)),		      \
      [ELF_T_VDEF]	= sizeof (ElfW2(LIBELFBITS, Ext_Verdef)),	      \
      [ELF_T_VDAUX]	= sizeof (ElfW2(LIBELFBITS, Ext_Verdaux)),	      \
      [ELF_T_VNEED]	= sizeof (ElfW2(LIBELFBITS, Ext_Verneed)),	      \
      [ELF_T_VNAUX]	= sizeof (ElfW2(LIBELFBITS, Ext_Vernaux)),	      \
      [ELF_T_NHDR]	= sizeof (ElfW2(LIBELFBITS, Ext_Nhdr)),		      \
      [ELF_T_SYMINFO]	= sizeof (ElfW2(LIBELFBITS, Ext_Syminfo)),	      \
      [ELF_T_MOVE]	= sizeof (ElfW2(LIBELFBITS, Ext_Move))
      TYPE_SIZES (32)
    },
    [ELFCLASS64 - 1] = {
      TYPE_SIZES (64)
    }
  }
};


size_t
gelf_fsize (elf, type, count, version)
     Elf *elf;
     Elf_Type type;
     size_t count;
     unsigned int version;
{
  /* We do not have differences between file and memory sizes.  Better
     not since otherwise `mmap' would not work.  */
  if (elf == NULL)
    return 0;

  if (version == EV_NONE || version >= EV_NUM)
    {
      __libelf_seterrno (ELF_E_UNKNOWN_VERSION);
      return 0;
    }

  if (type >= ELF_T_NUM)
    {
      __libelf_seterrno (ELF_E_UNKNOWN_TYPE);
      return 0;
    }

#if EV_NUM != 2
  return count * __libelf_type_sizes[version - 1][elf->class - 1][type];
#else
  return count * __libelf_type_sizes[0][elf->class - 1][type];
#endif
}
INTDEF(gelf_fsize)