1 /*- 2 * Copyright (c) 2015 Kai Wang 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <assert.h> 28 #include <errno.h> 29 #include <stdlib.h> 30 #include <string.h> 31 32 #include "_libpe.h" 33 34 ELFTC_VCSID("$Id: pe_dos.c 3312 2016-01-10 09:23:51Z kaiwang27 $"); 35 36 PE_DosHdr * 37 pe_msdos_header(PE *pe) 38 { 39 40 if (pe == NULL) { 41 errno = EINVAL; 42 return (NULL); 43 } 44 45 if (pe->pe_dh == NULL) { 46 errno = ENOENT; 47 return (NULL); 48 } 49 50 return (pe->pe_dh); 51 } 52 53 char * 54 pe_msdos_stub(PE *pe, size_t *len) 55 { 56 57 if (pe == NULL || len == NULL) { 58 errno = EINVAL; 59 return (NULL); 60 } 61 62 if (pe->pe_stub_ex > 0 && 63 (pe->pe_flags & LIBPE_F_LOAD_DOS_STUB) == 0) { 64 assert((pe->pe_flags & LIBPE_F_SPECIAL_FILE) == 0); 65 (void) libpe_read_msdos_stub(pe); 66 } 67 68 *len = sizeof(PE_DosHdr) + pe->pe_stub_ex; 69 70 return (pe->pe_stub); 71 } 72 73 int 74 ps_update_msdos_header(PE *pe, PE_DosHdr *dh) 75 { 76 77 if (pe == NULL || dh == NULL) { 78 errno = EINVAL; 79 return (-1); 80 } 81 82 if (pe->pe_cmd == PE_C_READ || pe->pe_flags & LIBPE_F_FD_DONE) { 83 errno = EACCES; 84 return (-1); 85 } 86 87 if (pe->pe_dh == NULL) { 88 if ((pe->pe_dh = malloc(sizeof(PE_DosHdr))) == NULL) { 89 errno = ENOMEM; 90 return (-1); 91 } 92 } 93 94 *pe->pe_dh = *dh; 95 96 pe->pe_flags |= LIBPE_F_DIRTY_DOS_HEADER; 97 98 return (0); 99 } 100 101 int 102 ps_update_msdos_stub(PE *pe, char *dos_stub, size_t sz) 103 { 104 105 if (pe == NULL || dos_stub == NULL || sz == 0) { 106 errno = EINVAL; 107 return (-1); 108 } 109 110 if (pe->pe_cmd == PE_C_READ || pe->pe_flags & LIBPE_F_FD_DONE) { 111 errno = EACCES; 112 return (-1); 113 } 114 115 pe->pe_stub_app = dos_stub; 116 pe->pe_stub_app_sz = sz; 117 118 return (0); 119 } 120