2 * Copyright (c) 2003-2007 Tim Kientzle
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
26 #include "archive_platform.h"
27 __FBSDID("$FreeBSD: head/lib/libarchive/archive_read_open_file.c 201093 2009-12-28 02:28:44Z kientzle $");
29 #ifdef HAVE_SYS_STAT_H
53 struct read_FILE_data {
60 static int file_close(struct archive *, void *);
61 static ssize_t file_read(struct archive *, void *, const void **buff);
62 static int64_t file_skip(struct archive *, void *, int64_t request);
65 archive_read_open_FILE(struct archive *a, FILE *f)
68 struct read_FILE_data *mine;
69 size_t block_size = 128 * 1024;
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");
79 return (ARCHIVE_FATAL);
81 mine->block_size = block_size;
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()).)
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. */
96 #if defined(__CYGWIN__) || defined(_WIN32)
97 setmode(fileno(mine->f), O_BINARY);
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));
108 file_read(struct archive *a, void *client_data, const void **buff)
110 struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
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");
122 file_skip(struct archive *a, void *client_data, int64_t request)
124 struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
126 off_t skip = (off_t)request;
128 int64_t skip = request;
130 long skip = (long)request;
132 int skip_bits = sizeof(skip) * 8 - 1;
134 (void)a; /* UNUSED */
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.
145 /* If request is too big for a long or an off_t, reduce it. */
146 if (sizeof(request) > sizeof(skip)) {
148 (((int64_t)1 << (skip_bits - 1)) - 1) * 2 + 1;
149 if (request > max_skip)
154 if (fseeko(mine->f, skip, SEEK_CUR) != 0)
156 if (_fseeki64(mine->f, skip, SEEK_CUR) != 0)
158 if (fseek(mine->f, skip, SEEK_CUR) != 0)
168 file_close(struct archive *a, void *client_data)
170 struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
172 (void)a; /* UNUSED */
173 if (mine->buffer != NULL)