external/bsd/libelf/dist/elf_memory.c

   1 /*      $NetBSD$        */
   2
   3 /*-
   4  * Copyright (c) 2006 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 #include <sys/cdefs.h>
  30 /* __FBSDID("$FreeBSD: src/lib/libelf/elf_memory.c,v 1.1.10.1.2.1 2009/10/25 01:10:29 kensmith Exp $"); */
  31
  32 #include <ar.h>
  33 #include <libelf.h>
  34 #include <string.h>
  35
  36 #include "_libelf.h"
  37
  38 Elf *
  39 elf_memory(char *image, size_t sz)
  40 {
  41         Elf *e;
  42
  43         if (LIBELF_PRIVATE(version) == EV_NONE) {
  44                 LIBELF_SET_ERROR(SEQUENCE, 0);
  45                 return (NULL);
  46         }
  47
  48         if (image == NULL || sz == 0) {
  49                 LIBELF_SET_ERROR(ARGUMENT, 0);
  50                 return (NULL);
  51         }
  52
  53         if ((e = _libelf_allocate_elf()) == NULL)
  54                 return (NULL);
  55
  56         e->e_cmd = ELF_C_READ;
  57         e->e_rawfile = image;
  58         e->e_rawsize = sz;
  59
  60 #undef  LIBELF_IS_ELF
  61 #define LIBELF_IS_ELF(P) ((P)[EI_MAG0] == ELFMAG0 &&            \
  62         (P)[EI_MAG1] == ELFMAG1 && (P)[EI_MAG2] == ELFMAG2 &&   \
  63         (P)[EI_MAG3] == ELFMAG3)
  64
  65         if (sz > EI_NIDENT && LIBELF_IS_ELF(image)) {
  66                 _libelf_init_elf(e, ELF_K_ELF);
  67                 e->e_class = image[EI_CLASS];
  68                 e->e_byteorder = image[EI_DATA];
  69                 e->e_version = image[EI_VERSION];
  70
  71                 if (e->e_version > EV_CURRENT) {
  72                         e = _libelf_release_elf(e);
  73                         LIBELF_SET_ERROR(VERSION, 0);
  74                         return (NULL);
  75                 }
  76
  77                 if ((e->e_byteorder != ELFDATA2LSB && e->e_byteorder !=
  78                     ELFDATA2MSB) || (e->e_class != ELFCLASS32 && e->e_class !=
  79                     ELFCLASS64)) {
  80                         e = _libelf_release_elf(e);
  81                         LIBELF_SET_ERROR(HEADER, 0);
  82                         return (NULL);
  83                 }
  84
  85         } else if (sz >= SARMAG &&
  86             strncmp(image, ARMAG, (size_t) SARMAG) == 0) {
  87                 _libelf_init_elf(e, ELF_K_AR);
  88                 e = _libelf_ar_open(e);
  89         } else
  90                 _libelf_init_elf(e, ELF_K_NONE);
  91
  92         return (e);
  93 }