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_open_file.c 201093 2009-12-28 02:28:44Z kientzle $");
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
53 struct read_FILE_data {
54 FILE *f;
55 size_t block_size;
56 void *buffer;
57 char can_skip;
58 };
59
60 static int file_close(struct archive *, void *);
61 static ssize_t file_read(struct archive *, void *, const void **buff);
62 #if ARCHIVE_API_VERSION < 2
63 static ssize_t file_skip(struct archive *, void *, size_t request);
64 #else
65 static off_t file_skip(struct archive *, void *, off_t request);
66 #endif
67
68 int
archive_read_open_FILE(struct archive * a,FILE * f)69 archive_read_open_FILE(struct archive *a, FILE *f)
70 {
71 struct stat st;
72 struct read_FILE_data *mine;
73 size_t block_size = 128 * 1024;
74 void *b;
75
76 archive_clear_error(a);
77 mine = (struct read_FILE_data *)malloc(sizeof(*mine));
78 b = malloc(block_size);
79 if (mine == NULL || b == NULL) {
80 archive_set_error(a, ENOMEM, "No memory");
81 free(mine);
82 free(b);
83 return (ARCHIVE_FATAL);
84 }
85 mine->block_size = block_size;
86 mine->buffer = b;
87 mine->f = f;
88 /*
89 * If we can't fstat() the file, it may just be that it's not
90 * a file. (FILE * objects can wrap many kinds of I/O
91 * streams, some of which don't support fileno()).)
92 */
93 if (fstat(fileno(mine->f), &st) == 0 && S_ISREG(st.st_mode)) {
94 archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino);
95 /* Enable the seek optimization only for regular files. */
96 mine->can_skip = 1;
97 } else
98 mine->can_skip = 0;
99
100 #if defined(__CYGWIN__) || defined(_WIN32)
101 setmode(fileno(mine->f), O_BINARY);
102 #endif
103
104 return (archive_read_open2(a, mine, NULL, file_read,
105 file_skip, file_close));
106 }
107
108 static ssize_t
file_read(struct archive * a,void * client_data,const void ** buff)109 file_read(struct archive *a, void *client_data, const void **buff)
110 {
111 struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
112 ssize_t bytes_read;
113
114 *buff = mine->buffer;
115 bytes_read = fread(mine->buffer, 1, mine->block_size, mine->f);
116 if (bytes_read < 0) {
117 archive_set_error(a, errno, "Error reading file");
118 }
119 return (bytes_read);
120 }
121
122 #if ARCHIVE_API_VERSION < 2
123 static ssize_t
file_skip(struct archive * a,void * client_data,size_t request)124 file_skip(struct archive *a, void *client_data, size_t request)
125 #else
126 static off_t
127 file_skip(struct archive *a, void *client_data, off_t request)
128 #endif
129 {
130 struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
131
132 (void)a; /* UNUSED */
133
134 /*
135 * If we can't skip, return 0 as the amount we did step and
136 * the caller will work around by reading and discarding.
137 */
138 if (!mine->can_skip)
139 return (0);
140 if (request == 0)
141 return (0);
142
143 #if HAVE_FSEEKO
144 if (fseeko(mine->f, request, SEEK_CUR) != 0)
145 #else
146 if (fseek(mine->f, request, SEEK_CUR) != 0)
147 #endif
148 {
149 mine->can_skip = 0;
150 return (0);
151 }
152 return (request);
153 }
154
155 static int
file_close(struct archive * a,void * client_data)156 file_close(struct archive *a, void *client_data)
157 {
158 struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
159
160 (void)a; /* UNUSED */
161 if (mine->buffer != NULL)
162 free(mine->buffer);
163 free(mine);
164 return (ARCHIVE_OK);
165 }
166