1 /*- 2 * Copyright (c) 2016 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 <unistd.h> 30 31 #include "_libpe.h" 32 33 ELFTC_VCSID("$Id: pe_update.c 3312 2016-01-10 09:23:51Z kaiwang27 $"); 34 35 off_t 36 pe_update(PE *pe) 37 { 38 off_t off; 39 40 if (pe == NULL) { 41 errno = EINVAL; 42 return (-1); 43 } 44 45 if (pe->pe_cmd == PE_C_READ || pe->pe_flags & LIBPE_F_FD_DONE) { 46 errno = EACCES; 47 return (-1); 48 } 49 50 if (pe->pe_cmd == PE_C_RDWR || (pe->pe_cmd == PE_C_WRITE && 51 (pe->pe_flags & LIBPE_F_SPECIAL_FILE) == 0)) { 52 if (lseek(pe->pe_fd, 0, SEEK_SET) < 0) { 53 errno = EIO; 54 return (-1); 55 } 56 } 57 58 off = 0; 59 60 if (pe->pe_obj == PE_O_PE32 || pe->pe_obj == PE_O_PE32P) { 61 if ((off = libpe_write_msdos_stub(pe, off)) < 0) 62 return (-1); 63 64 if ((off = libpe_write_pe_header(pe, off)) < 0) 65 return (-1); 66 } 67 68 if (libpe_resync_sections(pe, off) < 0) 69 return (-1); 70 71 if ((off = libpe_write_coff_header(pe, off)) < 0) 72 return (-1); 73 74 if ((off = libpe_write_section_headers(pe, off)) < 0) 75 return (-1); 76 77 if ((off = libpe_write_sections(pe, off)) < 0) 78 return (-1); 79 80 if (ftruncate(pe->pe_fd, off) < 0) { 81 errno = EIO; 82 return (-1); 83 } 84 85 return (off); 86 } 87