libelf/gelf_fsize.c

   1 /* Return the size of an object file type.
   2    Copyright (C) 1998-2010, 2015 Red Hat, Inc.
   3    This file is part of elfutils.
   4    Written by Ulrich Drepper <drepper@redhat.com>, 1998.
   5
   6    This file is free software; you can redistribute it and/or modify
   7    it under the terms of either
   8
   9      * the GNU Lesser General Public License as published by the Free
  10        Software Foundation; either version 3 of the License, or (at
  11        your option) any later version
  12
  13    or
  14
  15      * the GNU General Public License as published by the Free
  16        Software Foundation; either version 2 of the License, or (at
  17        your option) any later version
  18
  19    or both in parallel, as here.
  20
  21    elfutils is distributed in the hope that it will be useful, but
  22    WITHOUT ANY WARRANTY; without even the implied warranty of
  23    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  24    General Public License for more details.
  25
  26    You should have received copies of the GNU General Public License and
  27    the GNU Lesser General Public License along with this program.  If
  28    not, see <http://www.gnu.org/licenses/>.  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 # include <config.h>
  32 #endif
  33
  34 #include <gelf.h>
  35 #include <stddef.h>
  36
  37 #include "libelfP.h"
  38
  39
  40 /* These are the sizes for all the known types.  */
  41 const size_t __libelf_type_sizes[EV_NUM - 1][ELFCLASSNUM - 1][ELF_T_NUM] =
  42 {
  43   /* We have no entry for EV_NONE since we have to set an error.  */
  44   [EV_CURRENT - 1] = {
  45     [ELFCLASS32 - 1] = {
  46 #define TYPE_SIZES(LIBELFBITS) \
  47       [ELF_T_ADDR]      = ELFW2(LIBELFBITS, FSZ_ADDR),                        \
  48       [ELF_T_OFF]       = ELFW2(LIBELFBITS, FSZ_OFF),                         \
  49       [ELF_T_BYTE]      = 1,                                                  \
  50       [ELF_T_HALF]      = ELFW2(LIBELFBITS, FSZ_HALF),                        \
  51       [ELF_T_WORD]      = ELFW2(LIBELFBITS, FSZ_WORD),                        \
  52       [ELF_T_SWORD]     = ELFW2(LIBELFBITS, FSZ_SWORD),                       \
  53       [ELF_T_XWORD]     = ELFW2(LIBELFBITS, FSZ_XWORD),                       \
  54       [ELF_T_SXWORD]    = ELFW2(LIBELFBITS, FSZ_SXWORD),                      \
  55       [ELF_T_EHDR]      = sizeof (ElfW2(LIBELFBITS, Ext_Ehdr)),               \
  56       [ELF_T_SHDR]      = sizeof (ElfW2(LIBELFBITS, Ext_Shdr)),               \
  57       [ELF_T_SYM]       = sizeof (ElfW2(LIBELFBITS, Ext_Sym)),                \
  58       [ELF_T_REL]       = sizeof (ElfW2(LIBELFBITS, Ext_Rel)),                \
  59       [ELF_T_RELA]      = sizeof (ElfW2(LIBELFBITS, Ext_Rela)),               \
  60       [ELF_T_PHDR]      = sizeof (ElfW2(LIBELFBITS, Ext_Phdr)),               \
  61       [ELF_T_DYN]       = sizeof (ElfW2(LIBELFBITS, Ext_Dyn)),                \
  62       [ELF_T_VDEF]      = sizeof (ElfW2(LIBELFBITS, Ext_Verdef)),             \
  63       [ELF_T_VDAUX]     = sizeof (ElfW2(LIBELFBITS, Ext_Verdaux)),            \
  64       [ELF_T_VNEED]     = sizeof (ElfW2(LIBELFBITS, Ext_Verneed)),            \
  65       [ELF_T_VNAUX]     = sizeof (ElfW2(LIBELFBITS, Ext_Vernaux)),            \
  66       [ELF_T_NHDR]      = sizeof (ElfW2(LIBELFBITS, Ext_Nhdr)),               \
  67       [ELF_T_SYMINFO]   = sizeof (ElfW2(LIBELFBITS, Ext_Syminfo)),            \
  68       [ELF_T_MOVE]      = sizeof (ElfW2(LIBELFBITS, Ext_Move)),               \
  69       [ELF_T_LIB]       = sizeof (ElfW2(LIBELFBITS, Ext_Lib)),                \
  70       [ELF_T_AUXV]      = sizeof (ElfW2(LIBELFBITS, Ext_auxv_t)),             \
  71       [ELF_T_CHDR]      = sizeof (ElfW2(LIBELFBITS, Ext_Chdr)),               \
  72       [ELF_T_GNUHASH]   = ELFW2(LIBELFBITS, FSZ_WORD)
  73       TYPE_SIZES (32)
  74     },
  75     [ELFCLASS64 - 1] = {
  76       TYPE_SIZES (64)
  77     }
  78   }
  79 };
  80
  81
  82 size_t
  83 gelf_fsize (Elf *elf, Elf_Type type, size_t count, unsigned int version)
  84 {
  85   /* We do not have differences between file and memory sizes.  Better
  86      not since otherwise `mmap' would not work.  */
  87   if (elf == NULL)
  88     return 0;
  89
  90   if (version == EV_NONE || version >= EV_NUM)
  91     {
  92       __libelf_seterrno (ELF_E_UNKNOWN_VERSION);
  93       return 0;
  94     }
  95
  96   if (type >= ELF_T_NUM)
  97     {
  98       __libelf_seterrno (ELF_E_UNKNOWN_TYPE);
  99       return 0;
 100     }
 101
 102 #if EV_NUM != 2
 103   return count * __libelf_type_sizes[version - 1][elf->class - 1][type];
 104 #else
 105   return count * __libelf_type_sizes[0][elf->class - 1][type];
 106 #endif
 107 }
 108 INTDEF(gelf_fsize)