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("$FreeBSD$");
28
29#ifdef HAVE_SYS_STAT_H
30#include <sys/stat.h>
31#endif
32#ifdef HAVE_ERRNO_H
33#include <errno.h>
34#endif
35#ifdef HAVE_FCNTL_H
36#include <fcntl.h>
37#endif
38#ifdef HAVE_IO_H
39#include <io.h>
40#endif
41#ifdef HAVE_STDLIB_H
42#include <stdlib.h>
43#endif
44#ifdef HAVE_STRING_H
45#include <string.h>
46#endif
47#ifdef HAVE_UNISTD_H
48#include <unistd.h>
49#endif
50
51#include "archive.h"
52
53struct read_FILE_data {
54	FILE    *f;
55	size_t	 block_size;
56	void	*buffer;
57	char	 can_skip;
58};
59
60static int	file_close(struct archive *, void *);
61static ssize_t	file_read(struct archive *, void *, const void **buff);
62static int64_t	file_skip(struct archive *, void *, int64_t request);
63
64int
65archive_read_open_FILE(struct archive *a, FILE *f)
66{
67	struct stat st;
68	struct read_FILE_data *mine;
69	size_t block_size = 128 * 1024;
70	void *b;
71
72	archive_clear_error(a);
73	mine = (struct read_FILE_data *)malloc(sizeof(*mine));
74	b = malloc(block_size);
75	if (mine == NULL || b == NULL) {
76		archive_set_error(a, ENOMEM, "No memory");
77		free(mine);
78		free(b);
79		return (ARCHIVE_FATAL);
80	}
81	mine->block_size = block_size;
82	mine->buffer = b;
83	mine->f = f;
84	/*
85	 * If we can't fstat() the file, it may just be that it's not
86	 * a file.  (FILE * objects can wrap many kinds of I/O
87	 * streams, some of which don't support fileno()).)
88	 */
89	if (fstat(fileno(mine->f), &st) == 0 && S_ISREG(st.st_mode)) {
90		archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino);
91		/* Enable the seek optimization only for regular files. */
92		mine->can_skip = 1;
93	} else
94		mine->can_skip = 0;
95
96#if defined(__CYGWIN__) || defined(_WIN32)
97	setmode(fileno(mine->f), O_BINARY);
98#endif
99
100	archive_read_set_read_callback(a, file_read);
101	archive_read_set_skip_callback(a, file_skip);
102	archive_read_set_close_callback(a, file_close);
103	archive_read_set_callback_data(a, mine);
104	return (archive_read_open1(a));
105}
106
107static ssize_t
108file_read(struct archive *a, void *client_data, const void **buff)
109{
110	struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
111	size_t bytes_read;
112
113	*buff = mine->buffer;
114	bytes_read = fread(mine->buffer, 1, mine->block_size, mine->f);
115	if (bytes_read < mine->block_size && ferror(mine->f)) {
116		archive_set_error(a, errno, "Error reading file");
117	}
118	return (bytes_read);
119}
120
121static int64_t
122file_skip(struct archive *a, void *client_data, int64_t request)
123{
124	struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
125#if HAVE_FSEEKO
126	off_t skip = (off_t)request;
127#elif HAVE__FSEEKI64
128	int64_t skip = request;
129#else
130	long skip = (long)request;
131#endif
132	int skip_bits = sizeof(skip) * 8 - 1;
133
134	(void)a; /* UNUSED */
135
136	/*
137	 * If we can't skip, return 0 as the amount we did step and
138	 * the caller will work around by reading and discarding.
139	 */
140	if (!mine->can_skip)
141		return (0);
142	if (request == 0)
143		return (0);
144
145	/* If request is too big for a long or an off_t, reduce it. */
146	if (sizeof(request) > sizeof(skip)) {
147		int64_t max_skip =
148		    (((int64_t)1 << (skip_bits - 1)) - 1) * 2 + 1;
149		if (request > max_skip)
150			skip = max_skip;
151	}
152
153#if HAVE_FSEEKO
154	if (fseeko(mine->f, skip, SEEK_CUR) != 0)
155#elif HAVE__FSEEKI64
156	if (_fseeki64(mine->f, skip, SEEK_CUR) != 0)
157#else
158	if (fseek(mine->f, skip, SEEK_CUR) != 0)
159#endif
160	{
161		mine->can_skip = 0;
162		return (0);
163	}
164	return (request);
165}
166
167static int
168file_close(struct archive *a, void *client_data)
169{
170	struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
171
172	(void)a; /* UNUSED */
173	if (mine->buffer != NULL)
174		free(mine->buffer);
175	free(mine);
176	return (ARCHIVE_OK);
177}
178