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
31ELFTC_VCSID("$Id: pe_buffer.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
32
33PE_Buffer *
34pe_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
70PE_Buffer *
71pe_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