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      1 /*	$NetBSD: libelf_memory.c,v 1.7 2026/05/17 21:40:51 jkoshy 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 <sys/cdefs.h>
     34 
     35 #include <ar.h>
     36 #include <assert.h>
     37 #include <string.h>
     38 #include <libelf.h>
     39 
     40 #include "_libelf.h"
     41 
     42 ELFTC_VCSID("Id: libelf_memory.c 4074 2025-01-07 15:34:21Z jkoshy");
     43 
     44 __RCSID("$NetBSD: libelf_memory.c,v 1.7 2026/05/17 21:40:51 jkoshy Exp $");
     45 
     46 /*
     47  * Create an ELF descriptor for a memory image, optionally reporting
     48  * parse errors.
     49  */
     50 
     51 Elf *
     52 _libelf_memory(unsigned char *image, size_t sz, int reporterror)
     53 {
     54 	Elf *e;
     55 	unsigned int e_class;
     56 	enum Elf_Error error;
     57 	unsigned int e_byteorder, e_version;
     58 
     59 	assert(image != NULL);
     60 	assert(sz > 0);
     61 
     62 	if ((e = _libelf_allocate_elf()) == NULL)
     63 		return (NULL);
     64 
     65 	e->e_cmd = ELF_C_READ;
     66 	e->e_rawfile = image;
     67 	e->e_rawsize = (off_t) sz;
     68 
     69 #undef	LIBELF_IS_ELF
     70 #define	LIBELF_IS_ELF(P) ((P)[EI_MAG0] == ELFMAG0 && 		\
     71 	(P)[EI_MAG1] == ELFMAG1 && (P)[EI_MAG2] == ELFMAG2 &&	\
     72 	(P)[EI_MAG3] == ELFMAG3)
     73 
     74 	if (sz > EI_NIDENT && LIBELF_IS_ELF(image)) {
     75 		e_byteorder = image[EI_DATA];
     76 		e_class     = image[EI_CLASS];
     77 		e_version   = image[EI_VERSION];
     78 
     79 		error = ELF_E_NONE;
     80 
     81 		if (e_version > EV_CURRENT)
     82 			error = ELF_E_VERSION;
     83 		else if ((e_byteorder != ELFDATA2LSB && e_byteorder !=
     84  		    ELFDATA2MSB) || (e_class != ELFCLASS32 && e_class !=
     85 		    ELFCLASS64))
     86 			error = ELF_E_HEADER;
     87 
     88 		if (error != ELF_E_NONE) {
     89 			if (reporterror) {
     90 				LIBELF_PRIVATE(error) = LIBELF_ERROR(error, 0);
     91 				_libelf_release_elf(e);
     92 				return (NULL);
     93 			}
     94 		} else {
     95 			_libelf_init_elf(e, ELF_K_ELF);
     96 
     97 			e->e_byteorder = e_byteorder;
     98 			e->e_class = e_class;
     99 			e->e_version = e_version;
    100 		}
    101 	} else if (sz >= SARMAG &&
    102 	    strncmp((const char *) image, ARMAG, (size_t) SARMAG) == 0)
    103 		return (_libelf_ar_open(e, reporterror));
    104 
    105 	return (e);
    106 }
    107