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 <errno.h>
28 #include <stdlib.h>
29 #include <string.h>
30 
31 #include "_libpe.h"
32 
33 ELFTC_VCSID("$Id: pe_coff.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
34 
35 PE_CoffHdr *
36 pe_coff_header(PE *pe)
37 {
38 
39 	if (pe->pe_ch == NULL) {
40 		errno = ENOENT;
41 		return (NULL);
42 	}
43 
44 	return (pe->pe_ch);
45 }
46 
47 PE_OptHdr *
48 pe_opt_header(PE *pe)
49 {
50 
51 	if (pe->pe_oh == NULL) {
52 		errno = ENOENT;
53 		return (NULL);
54 	}
55 
56 	return (pe->pe_oh);
57 }
58 
59 PE_DataDir *
60 pe_data_dir(PE *pe)
61 {
62 
63 	if (pe->pe_dd == NULL) {
64 		errno = ENOENT;
65 		return (NULL);
66 	}
67 
68 	return (pe->pe_dd);
69 }
70 
71 int
72 pe_update_coff_header(PE *pe, PE_CoffHdr *ch)
73 {
74 
75 	if (pe == NULL || ch == NULL) {
76 		errno = EINVAL;
77 		return (-1);
78 	}
79 
80 	if (pe->pe_cmd == PE_C_READ || pe->pe_flags & LIBPE_F_FD_DONE) {
81 		errno = EACCES;
82 		return (-1);
83 	}
84 
85 	if (pe->pe_ch == NULL) {
86 		if ((pe->pe_ch = malloc(sizeof(PE_CoffHdr))) == NULL) {
87 			errno = ENOMEM;
88 			return (-1);
89 		}
90 	} else {
91 		/* Rewrite optional header if `optsize' field changed. */
92 		if (pe->pe_ch->ch_optsize != ch->ch_optsize)
93 			pe->pe_flags |= LIBPE_F_DIRTY_OPT_HEADER;
94 	}
95 
96 	*pe->pe_ch = *ch;
97 
98 	pe->pe_flags |= LIBPE_F_DIRTY_COFF_HEADER;
99 
100 	return (0);
101 }
102 
103 int
104 pe_update_opt_header(PE *pe, PE_OptHdr *oh)
105 {
106 
107 	if (pe == NULL || oh == NULL) {
108 		errno = EINVAL;
109 		return (-1);
110 	}
111 
112 	if (pe->pe_cmd == PE_C_READ || pe->pe_flags & LIBPE_F_FD_DONE) {
113 		errno = EACCES;
114 		return (-1);
115 	}
116 
117 	if (pe->pe_oh == NULL) {
118 		if ((pe->pe_oh = malloc(sizeof(PE_OptHdr))) == NULL) {
119 			errno = ENOMEM;
120 			return (-1);
121 		}
122 	}
123 
124 	*pe->pe_oh = *oh;
125 
126 	pe->pe_flags |= LIBPE_F_DIRTY_OPT_HEADER;
127 
128 	return (0);
129 }
130 
131 int
132 pe_update_data_dir(PE *pe, PE_DataDir *dd)
133 {
134 
135 	if (pe == NULL || dd == NULL) {
136 		errno = EINVAL;
137 		return (-1);
138 	}
139 
140 	if (pe->pe_cmd == PE_C_READ || pe->pe_flags & LIBPE_F_FD_DONE) {
141 		errno = EACCES;
142 		return (-1);
143 	}
144 
145 	if (pe->pe_dd == NULL) {
146 		if ((pe->pe_dd = malloc(sizeof(PE_DataDir))) == NULL) {
147 			errno = ENOMEM;
148 			return (-1);
149 		}
150 	}
151 
152 	*pe->pe_dd = *dd;
153 
154 	pe->pe_flags |= LIBPE_F_DIRTY_OPT_HEADER;
155 
156 	return (0);
157 }
158