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