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 *, int);
35 static int archive_read_format_empty_read_data(struct archive_read *,
36 const void **, size_t *, int64_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 archive_check_magic(_a, ARCHIVE_READ_MAGIC,
46 ARCHIVE_STATE_NEW, "archive_read_support_format_empty");
47
48 r = __archive_read_register_format(a,
49 NULL,
50 "empty",
51 archive_read_format_empty_bid,
52 NULL,
53 archive_read_format_empty_read_header,
54 archive_read_format_empty_read_data,
55 NULL,
56 NULL,
57 NULL,
58 NULL,
59 NULL);
60
61 return (r);
62 }
63
64
65 static int
archive_read_format_empty_bid(struct archive_read * a,int best_bid)66 archive_read_format_empty_bid(struct archive_read *a, int best_bid)
67 {
68 if (best_bid < 1 && __archive_read_ahead(a, 1, NULL) == NULL)
69 return (1);
70 return (-1);
71 }
72
73 static int
archive_read_format_empty_read_header(struct archive_read * a,struct archive_entry * entry)74 archive_read_format_empty_read_header(struct archive_read *a,
75 struct archive_entry *entry)
76 {
77 (void)a; /* UNUSED */
78 (void)entry; /* UNUSED */
79
80 a->archive.archive_format = ARCHIVE_FORMAT_EMPTY;
81 a->archive.archive_format_name = "Empty file";
82
83 return (ARCHIVE_EOF);
84 }
85
86 static int
archive_read_format_empty_read_data(struct archive_read * a,const void ** buff,size_t * size,int64_t * offset)87 archive_read_format_empty_read_data(struct archive_read *a,
88 const void **buff, size_t *size, int64_t *offset)
89 {
90 (void)a; /* UNUSED */
91 (void)buff; /* UNUSED */
92 (void)size; /* UNUSED */
93 (void)offset; /* UNUSED */
94
95 return (ARCHIVE_EOF);
96 }
97