1 /*
2 Copyright (C) 2003, 2004, 2005, 2008, 2011 Rocky Bernstein <rocky@gnu.org>
3 Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #ifdef HAVE_CONFIG_H
20 # include "config.h"
21 # define __CDIO_CONFIG_H__ 1
22 #endif
23
24 #ifdef HAVE_STDIO_H
25 #include <stdio.h>
26 #endif
27 #ifdef HAVE_STDLIB_H
28 #include <stdlib.h>
29 #endif
30 #ifdef HAVE_STRING_H
31 #include <string.h>
32 #endif
33 #ifdef HAVE_UNISTD_H
34 #include <unistd.h>
35 #endif
36 #ifdef HAVE_SYS_STAT_H
37 #include <sys/stat.h>
38 #endif
39 #ifdef HAVE_ERRNO_H
40 #include <errno.h>
41 #endif
42 #include <ctype.h>
43
44 #include <cdio/logging.h>
45 #include <cdio/util.h>
46 #include "_cdio_stream.h"
47 #include "_cdio_stdio.h"
48 #include "cdio_assert.h"
49
50 /* On 32 bit platforms, fseek can only access streams of 2 GB or less.
51 Prefer fseeko/fseeko64, that take a 64 bit offset when LFS is enabled */
52 #if defined(HAVE_FSEEKO64) && defined(_FILE_OFFSET_BITS) && (_FILE_OFFSET_BITS == 64)
53 #define CDIO_FSEEK fseeko64
54 #elif defined(HAVE_FSEEKO)
55 #define CDIO_FSEEK fseeko
56 #else
57 #define CDIO_FSEEK fseek
58 #endif
59
60 /* Windows' fopen is not UTF-8 compliant, so we use our own */
61 #if defined(_WIN32)
62 #include <cdio/utf8.h>
63 #define CDIO_FOPEN fopen_utf8
64 #else
65 #define CDIO_FOPEN fopen
66 #endif
67
68 /* Use _stati64 if needed, on platforms that don't have transparent LFS support */
69 #if defined(HAVE__STATI64) && defined(_FILE_OFFSET_BITS) && (_FILE_OFFSET_BITS == 64)
70 #define CDIO_STAT_STRUCT _stati64
71 #if defined(_WIN32)
72 /* Once again, use our own UTF-8 compliant version */
_stati64_utf8(const char * path,struct _stati64 * buffer)73 static inline int _stati64_utf8(const char *path, struct _stati64 *buffer) {
74 int ret;
75 wchar_t* wpath = cdio_utf8_to_wchar(path);
76 ret = _wstati64(wpath, buffer);
77 cdio_free(wpath);
78 return ret;
79 }
80 #define CDIO_STAT_CALL _stati64_utf8
81 #else
82 #define CDIO_STAT_CALL _stati64
83 #endif
84 #else
85 #define CDIO_STAT_STRUCT stat
86 #define CDIO_STAT_CALL stat
87 #endif
88
89 #define _STRINGIFY(a) #a
90 #define STRINGIFY(a) _STRINGIFY(a)
91
92 #define CDIO_STDIO_BUFSIZE (128*1024)
93
94 typedef struct {
95 char *pathname;
96 FILE *fd;
97 char *fd_buf;
98 off_t st_size; /* used only for source */
99 } _UserData;
100
101 static int
_stdio_open(void * user_data)102 _stdio_open (void *user_data)
103 {
104 _UserData *const ud = user_data;
105
106 if ((ud->fd = CDIO_FOPEN (ud->pathname, "rb")))
107 {
108 ud->fd_buf = calloc (1, CDIO_STDIO_BUFSIZE);
109 setvbuf (ud->fd, ud->fd_buf, _IOFBF, CDIO_STDIO_BUFSIZE);
110 }
111
112 return (ud->fd == NULL);
113 }
114
115 static int
_stdio_close(void * user_data)116 _stdio_close(void *user_data)
117 {
118 _UserData *const ud = user_data;
119
120 if (fclose (ud->fd))
121 cdio_error ("fclose (): %s", strerror (errno));
122
123 ud->fd = NULL;
124
125 free (ud->fd_buf);
126 ud->fd_buf = NULL;
127
128 return 0;
129 }
130
131 static void
_stdio_free(void * user_data)132 _stdio_free(void *user_data)
133 {
134 _UserData *const ud = user_data;
135
136 if (ud->pathname)
137 free(ud->pathname);
138
139 if (ud->fd) /* should be NULL anyway... */
140 _stdio_close(user_data);
141
142 free(ud);
143 }
144
145 /*!
146 Like fseek/fseeko(3) and in fact may be the same.
147
148 This function sets the file position indicator for the stream
149 pointed to by stream. The new position, measured in bytes, is obtained
150 by adding offset bytes to the position specified by whence. If whence
151 is set to SEEK_SET, SEEK_CUR, or SEEK_END, the offset is relative to
152 the start of the file, the current position indicator, or end-of-file,
153 respectively. A successful call to the fseek function clears the end-
154 of-file indicator for the stream and undoes any effects of the
155 ungetc(3) function on the same stream.
156
157 @return upon successful completion, DRIVER_OP_SUCCESS, else,
158 DRIVER_OP_ERROR is returned and the global variable errno is set to
159 indicate the error.
160 */
161 static int
_stdio_seek(void * p_user_data,off_t i_offset,int whence)162 _stdio_seek(void *p_user_data, off_t i_offset, int whence)
163 {
164 _UserData *const ud = p_user_data;
165 int ret;
166 #if !defined(HAVE_FSEEKO) && !defined(HAVE_FSEEKO64)
167 /* Detect if off_t is lossy-truncated to long to avoid data corruption */
168 if ( (sizeof(off_t) > sizeof(long)) && (i_offset != (off_t)((long)i_offset)) ) {
169 cdio_error ( STRINGIFY(CDIO_FSEEK) " (): lossy truncation detected!");
170 errno = EFBIG;
171 return DRIVER_OP_ERROR;
172 }
173 #endif
174
175 if ( (ret=CDIO_FSEEK (ud->fd, i_offset, whence)) ) {
176 cdio_error ( STRINGIFY(CDIO_FSEEK) " (): %s", strerror (errno));
177 }
178
179 return ret;
180 }
181
182 static off_t
_stdio_stat(void * p_user_data)183 _stdio_stat(void *p_user_data)
184 {
185 const _UserData *const ud = p_user_data;
186
187 return ud->st_size;
188 }
189
190 /*!
191 Like fread(3) and in fact is about the same.
192
193 DESCRIPTION:
194 The function fread reads nmemb elements of data, each size bytes long,
195 from the stream pointed to by stream, storing them at the location
196 given by ptr.
197
198 RETURN VALUE:
199 return the number of items successfully read or written (i.e.,
200 not the number of characters). If an error occurs, or the
201 end-of-file is reached, the return value is a short item count
202 (or zero).
203
204 We do not distinguish between end-of-file and error, and callers
205 must use feof(3) and ferror(3) to determine which occurred.
206 */
207 static ssize_t
_stdio_read(void * user_data,void * buf,size_t count)208 _stdio_read(void *user_data, void *buf, size_t count)
209 {
210 _UserData *const ud = user_data;
211 long read_count;
212
213 read_count = fread(buf, 1, count, ud->fd);
214
215 if (read_count != count)
216 { /* fixme -- ferror/feof */
217 if (feof (ud->fd))
218 {
219 cdio_debug ("fread (): EOF encountered");
220 clearerr (ud->fd);
221 }
222 else if (ferror (ud->fd))
223 {
224 cdio_error ("fread (): %s", strerror (errno));
225 clearerr (ud->fd);
226 }
227 else
228 cdio_debug ("fread (): short read and no EOF?!?");
229 }
230
231 return read_count;
232 }
233
234 /*!
235 Deallocate resources assocaited with obj. After this obj is unusable.
236 */
237 void
cdio_stdio_destroy(CdioDataSource_t * p_obj)238 cdio_stdio_destroy(CdioDataSource_t *p_obj)
239 {
240 cdio_stream_destroy(p_obj);
241 }
242
243 CdioDataSource_t *
cdio_stdio_new(const char pathname[])244 cdio_stdio_new(const char pathname[])
245 {
246 CdioDataSource_t *new_obj = NULL;
247 cdio_stream_io_functions funcs = { NULL, NULL, NULL, NULL, NULL, NULL };
248 _UserData *ud = NULL;
249 struct CDIO_STAT_STRUCT statbuf;
250 char* pathdup;
251
252 if (pathname == NULL)
253 return NULL;
254
255 /* MinGW may require a translated path */
256 pathdup = _cdio_strdup_fixpath(pathname);
257 if (pathdup == NULL)
258 return NULL;
259
260 if (CDIO_STAT_CALL (pathdup, &statbuf) == -1)
261 {
262 cdio_warn ("could not retrieve file info for `%s': %s",
263 pathdup, strerror (errno));
264 cdio_free(pathdup);
265 return NULL;
266 }
267
268 ud = calloc (1, sizeof (_UserData));
269 cdio_assert (ud != NULL);
270
271 ud->pathname = pathdup;
272 ud->st_size = statbuf.st_size; /* let's hope it doesn't change... */
273
274 funcs.open = _stdio_open;
275 funcs.seek = _stdio_seek;
276 funcs.stat = _stdio_stat;
277 funcs.read = _stdio_read;
278 funcs.close = _stdio_close;
279 funcs.free = _stdio_free;
280
281 new_obj = cdio_stream_new(ud, &funcs);
282
283 return new_obj;
284 }
285
286
287 /*
288 * Local variables:
289 * c-file-style: "gnu"
290 * tab-width: 8
291 * indent-tabs-mode: nil
292 * End:
293 */
294