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 <errno.h>
28
29 #include "_libpe.h"
30
31 ELFTC_VCSID("$Id: pe_buffer.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
32
33 PE_Buffer *
pe_getbuffer(PE_Scn * ps,PE_Buffer * pb)34 pe_getbuffer(PE_Scn *ps, PE_Buffer *pb)
35 {
36 PE *pe;
37 PE_SecBuf *sb;
38
39 if (ps == NULL) {
40 errno = EINVAL;
41 return (NULL);
42 }
43
44 pe = ps->ps_pe;
45
46 if ((ps->ps_flags & LIBPE_F_LOAD_SECTION) == 0) {
47 if (pe->pe_flags & LIBPE_F_FD_DONE) {
48 errno = EACCES;
49 return (NULL);
50 }
51 if (pe->pe_flags & LIBPE_F_SPECIAL_FILE) {
52 if (libpe_load_all_sections(pe) < 0)
53 return (NULL);
54 } else {
55 if (libpe_load_section(pe, ps) < 0)
56 return (NULL);
57 }
58 }
59
60 sb = (PE_SecBuf *) pb;
61
62 if (sb == NULL)
63 sb = STAILQ_FIRST(&ps->ps_b);
64 else
65 sb = STAILQ_NEXT(sb, sb_next);
66
67 return ((PE_Buffer *) sb);
68 }
69
70 PE_Buffer *
pe_newbuffer(PE_Scn * ps)71 pe_newbuffer(PE_Scn *ps)
72 {
73 PE *pe;
74 PE_SecBuf *sb;
75
76 if (ps == NULL) {
77 errno = EINVAL;
78 return (NULL);
79 }
80
81 pe = ps->ps_pe;
82
83 if (pe->pe_flags & LIBPE_F_FD_DONE) {
84 errno = EACCES;
85 return (NULL);
86 }
87
88 if ((ps->ps_flags & LIBPE_F_LOAD_SECTION) == 0) {
89 if (libpe_load_section(pe, ps) < 0)
90 return (NULL);
91 }
92
93 if ((sb = libpe_alloc_buffer(ps, 0)) == NULL)
94 return (NULL);
95
96 sb->sb_flags |= PE_F_DIRTY;
97 ps->ps_flags |= PE_F_DIRTY;
98
99 return ((PE_Buffer *) sb);
100 }
101