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: src/lib/libarchive/archive_read_support_format_empty.c,v 1.4 2008/12/06 06:45:15 kientzle Exp $");
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 NULL,
55 NULL);
56
57 return (r);
58 }
59
60
61 static int
archive_read_format_empty_bid(struct archive_read * a)62 archive_read_format_empty_bid(struct archive_read *a)
63 {
64 ssize_t avail;
65
66 (void)__archive_read_ahead(a, 1, &avail);
67 if (avail != 0)
68 return (-1);
69 return (1);
70 }
71
72 static int
archive_read_format_empty_read_header(struct archive_read * a,struct archive_entry * entry)73 archive_read_format_empty_read_header(struct archive_read *a,
74 struct archive_entry *entry)
75 {
76 (void)a; /* UNUSED */
77 (void)entry; /* UNUSED */
78
79 a->archive.archive_format = ARCHIVE_FORMAT_EMPTY;
80 a->archive.archive_format_name = "Empty file";
81
82 return (ARCHIVE_EOF);
83 }
84
85 static int
archive_read_format_empty_read_data(struct archive_read * a,const void ** buff,size_t * size,off_t * offset)86 archive_read_format_empty_read_data(struct archive_read *a,
87 const void **buff, size_t *size, off_t *offset)
88 {
89 (void)a; /* UNUSED */
90 (void)buff; /* UNUSED */
91 (void)size; /* UNUSED */
92 (void)offset; /* UNUSED */
93
94 return (ARCHIVE_EOF);
95 }
96