1 /*-
2 * Copyright (c) 2003-2007 Tim Kientzle
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(S) ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "archive_platform.h"
27 __FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_empty.c 191524 2009-04-26 18:24:14Z kientzle $");
28
29 #include "archive.h"
30 #include "archive_entry.h"
31 #include "archive_private.h"
32 #include "archive_read_private.h"
33
34 static int archive_read_format_empty_bid(struct archive_read *);
35 static int archive_read_format_empty_read_data(struct archive_read *,
36 const void **, size_t *, off_t *);
37 static int archive_read_format_empty_read_header(struct archive_read *,
38 struct archive_entry *);
39 int
archive_read_support_format_empty(struct archive * _a)40 archive_read_support_format_empty(struct archive *_a)
41 {
42 struct archive_read *a = (struct archive_read *)_a;
43 int r;
44
45 r = __archive_read_register_format(a,
46 NULL,
47 NULL,
48 archive_read_format_empty_bid,
49 NULL,
50 archive_read_format_empty_read_header,
51 archive_read_format_empty_read_data,
52 NULL,
53 NULL);
54
55 return (r);
56 }
57
58
59 static int
archive_read_format_empty_bid(struct archive_read * a)60 archive_read_format_empty_bid(struct archive_read *a)
61 {
62 ssize_t avail;
63
64 (void)__archive_read_ahead(a, 1, &avail);
65 if (avail != 0)
66 return (-1);
67 return (1);
68 }
69
70 static int
archive_read_format_empty_read_header(struct archive_read * a,struct archive_entry * entry)71 archive_read_format_empty_read_header(struct archive_read *a,
72 struct archive_entry *entry)
73 {
74 (void)a; /* UNUSED */
75 (void)entry; /* UNUSED */
76
77 a->archive.archive_format = ARCHIVE_FORMAT_EMPTY;
78 a->archive.archive_format_name = "Empty file";
79
80 return (ARCHIVE_EOF);
81 }
82
83 static int
archive_read_format_empty_read_data(struct archive_read * a,const void ** buff,size_t * size,off_t * offset)84 archive_read_format_empty_read_data(struct archive_read *a,
85 const void **buff, size_t *size, off_t *offset)
86 {
87 (void)a; /* UNUSED */
88 (void)buff; /* UNUSED */
89 (void)size; /* UNUSED */
90 (void)offset; /* UNUSED */
91
92 return (ARCHIVE_EOF);
93 }
94