external/bsd/elftoolchain/dist/libelf/libelf_memory.c

   1 /*      $NetBSD: libelf_memory.c,v 1.2 2014/03/09 16:58:04 christos Exp $       */
   2
   3 /*-
   4  * Copyright (c) 2011 Joseph Koshy
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #if HAVE_NBTOOL_CONFIG_H
  30 # include "nbtool_config.h"
  31 #endif
  32
  33 #include <ar.h>
  34 #include <assert.h>
  35 #include <string.h>
  36 #include <libelf.h>
  37
  38 #include "_libelf.h"
  39
  40 __RCSID("$NetBSD: libelf_memory.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
  41 ELFTC_VCSID("Id: libelf_memory.c 2368 2011-12-29 06:34:28Z jkoshy ");
  42
  43 /*
  44  * Create an ELF descriptor for a memory image, optionally reporting
  45  * parse errors.
  46  */
  47
  48 Elf *
  49 _libelf_memory(char *image, size_t sz, int reporterror)
  50 {
  51         Elf *e;
  52         int e_class;
  53         enum Elf_Error error;
  54         unsigned int e_byteorder, e_version;
  55
  56         assert(image != NULL);
  57         assert(sz > 0);
  58
  59         if ((e = _libelf_allocate_elf()) == NULL)
  60                 return (NULL);
  61
  62         e->e_cmd = ELF_C_READ;
  63         e->e_rawfile = image;
  64         e->e_rawsize = sz;
  65
  66 #undef  LIBELF_IS_ELF
  67 #define LIBELF_IS_ELF(P) ((P)[EI_MAG0] == ELFMAG0 &&            \
  68         (P)[EI_MAG1] == ELFMAG1 && (P)[EI_MAG2] == ELFMAG2 &&   \
  69         (P)[EI_MAG3] == ELFMAG3)
  70
  71         if (sz > EI_NIDENT && LIBELF_IS_ELF(image)) {
  72                 e_byteorder = image[EI_DATA];
  73                 e_class     = image[EI_CLASS];
  74                 e_version   = image[EI_VERSION];
  75
  76                 error = ELF_E_NONE;
  77
  78                 if (e_version > EV_CURRENT)
  79                         error = ELF_E_VERSION;
  80                 else if ((e_byteorder != ELFDATA2LSB && e_byteorder !=
  81                     ELFDATA2MSB) || (e_class != ELFCLASS32 && e_class !=
  82                     ELFCLASS64))
  83                         error = ELF_E_HEADER;
  84
  85                 if (error != ELF_E_NONE) {
  86                         if (reporterror) {
  87                                 LIBELF_PRIVATE(error) = LIBELF_ERROR(error, 0);
  88                                 (void) _libelf_release_elf(e);
  89                                 return (NULL);
  90                         }
  91                 } else {
  92                         _libelf_init_elf(e, ELF_K_ELF);
  93
  94                         e->e_byteorder = e_byteorder;
  95                         e->e_class = e_class;
  96                         e->e_version = e_version;
  97                 }
  98         } else if (sz >= SARMAG &&
  99             strncmp(image, ARMAG, (size_t) SARMAG) == 0)
 100                 return (_libelf_ar_open(e, reporterror));
 101
 102         return (e);
 103 }