summaryrefslogtreecommitdiff
path: root/src/fs/fs_file_information.c
blob: d369598efa3d55d7a45723c93e6440ae44346858 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
/*
     This file is part of GNUnet.
     (C) 2009, 2011 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 3, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file fs/fs_file_information.c
 * @brief  Manage information for publishing directory hierarchies
 * @author Christian Grothoff
 */
#include "platform.h"
#include <extractor.h>
#include "gnunet_fs_service.h"
#include "fs_api.h"
#include "fs_tree.h"


/**
 * Obtain the name under which this file information
 * structure is stored on disk.  Only works for top-level
 * file information structures.
 *
 * @param s structure to get the filename for
 * @return NULL on error, otherwise filename that
 *         can be used to read this fi-struct from disk.
 */
const char *
GNUNET_FS_file_information_get_id (struct GNUNET_FS_FileInformation *s)
{
  if (NULL != s->dir)
    return NULL;
  return s->serialization;
}

/**
 * Obtain the filename from the file information structure.
 *
 * @param s structure to get the filename for
 * @return "filename" field of the structure (can be NULL)
 */
const char *
GNUNET_FS_file_information_get_filename (struct GNUNET_FS_FileInformation *s)
{
  return s->filename;
}


/**
 * Set the filename in the file information structure.
 * If filename was already set, frees it before setting the new one.
 * Makes a copy of the argument.
 *
 * @param s structure to get the filename for
 * @param filename filename to set
 */
void
GNUNET_FS_file_information_set_filename (struct GNUNET_FS_FileInformation *s,
                                         const char *filename)
{
  GNUNET_free_non_null (s->filename);
  if (filename)
    s->filename = GNUNET_strdup (filename);
  else
    s->filename = NULL;
}


/**
 * Create an entry for a file in a publish-structure.
 *
 * @param h handle to the file sharing subsystem
 * @param client_info initial value for the client-info value for this entry
 * @param filename name of the file or directory to publish
 * @param keywords under which keywords should this file be available
 *         directly; can be NULL
 * @param meta metadata for the file
 * @param do_index #GNUNET_YES for index, #GNUNET_NO for insertion,
 *                #GNUNET_SYSERR for simulation
 * @param bo block options
 * @return publish structure entry for the file
 */
struct GNUNET_FS_FileInformation *
GNUNET_FS_file_information_create_from_file (struct GNUNET_FS_Handle *h,
                                             void *client_info,
                                             const char *filename,
                                             const struct GNUNET_FS_Uri
                                             *keywords,
                                             const struct
                                             GNUNET_CONTAINER_MetaData *meta,
                                             int do_index,
                                             const struct GNUNET_FS_BlockOptions
                                             *bo)
{
  struct FileInfo *fi;
  uint64_t fsize;
  struct GNUNET_FS_FileInformation *ret;
  const char *fn;
  const char *ss;

#if WINDOWS
  char fn_conv[MAX_PATH];
#endif

  /* FIXME: should include_symbolic_links be GNUNET_NO or GNUNET_YES here? */
  if (GNUNET_OK != GNUNET_DISK_file_size (filename, &fsize, GNUNET_NO, GNUNET_YES))
  {
    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "stat", filename);
    return NULL;
  }
  fi = GNUNET_FS_make_file_reader_context_ (filename);
  if (NULL == fi)
  {
    GNUNET_break (0);
    return NULL;
  }
  ret =
      GNUNET_FS_file_information_create_from_reader (h, client_info,
                                                     fsize,
                                                     &GNUNET_FS_data_reader_file_,
                                                     fi, keywords, meta,
                                                     do_index, bo);
  if (ret == NULL)
    return NULL;
  ret->h = h;
  ret->filename = GNUNET_strdup (filename);
#if !WINDOWS
  fn = filename;
#else
  plibc_conv_to_win_path (filename, fn_conv);
  fn = fn_conv;
#endif
  while (NULL != (ss = strstr (fn, DIR_SEPARATOR_STR)))
    fn = ss + 1;
/* FIXME: If we assume that on other platforms CRT is UTF-8-aware, then
 * this should be changed to EXTRACTOR_METAFORMAT_UTF8
 */
#if !WINDOWS
  GNUNET_CONTAINER_meta_data_insert (ret->meta, "<gnunet>",
                                     EXTRACTOR_METATYPE_GNUNET_ORIGINAL_FILENAME,
                                     EXTRACTOR_METAFORMAT_C_STRING,
                                     "text/plain", fn, strlen (fn) + 1);
#else
  GNUNET_CONTAINER_meta_data_insert (ret->meta, "<gnunet>",
                                     EXTRACTOR_METATYPE_GNUNET_ORIGINAL_FILENAME,
                                     EXTRACTOR_METAFORMAT_UTF8,
                                     "text/plain", fn, strlen (fn) + 1);
#endif
  return ret;
}


/**
 * Create an entry for a file in a publish-structure.
 *
 * @param h handle to the file sharing subsystem
 * @param client_info initial value for the client-info value for this entry
 * @param length length of the file
 * @param data data for the file (should not be used afterwards by
 *        the caller; callee will "free")
 * @param keywords under which keywords should this file be available
 *         directly; can be NULL
 * @param meta metadata for the file
 * @param do_index GNUNET_YES for index, GNUNET_NO for insertion,
 *                GNUNET_SYSERR for simulation
 * @param bo block options
 * @return publish structure entry for the file
 */
struct GNUNET_FS_FileInformation *
GNUNET_FS_file_information_create_from_data (struct GNUNET_FS_Handle *h,
                                             void *client_info, uint64_t length,
                                             void *data,
                                             const struct GNUNET_FS_Uri
                                             *keywords,
                                             const struct
                                             GNUNET_CONTAINER_MetaData *meta,
                                             int do_index,
                                             const struct GNUNET_FS_BlockOptions
                                             *bo)
{
  if (GNUNET_YES == do_index)
  {
    GNUNET_break (0);
    return NULL;
  }
  return GNUNET_FS_file_information_create_from_reader (h, client_info, length,
                                                        &GNUNET_FS_data_reader_copy_,
                                                        data, keywords, meta,
                                                        do_index, bo);
}


/**
 * Create an entry for a file in a publish-structure.
 *
 * @param h handle to the file sharing subsystem
 * @param client_info initial value for the client-info value for this entry
 * @param length length of the file
 * @param reader function that can be used to obtain the data for the file
 * @param reader_cls closure for "reader"
 * @param keywords under which keywords should this file be available
 *         directly; can be NULL
 * @param meta metadata for the file
 * @param do_index #GNUNET_YES for index, #GNUNET_NO for insertion,
 *                #GNUNET_SYSERR for simulation
 * @param bo block options
 * @return publish structure entry for the file
 */
struct GNUNET_FS_FileInformation *
GNUNET_FS_file_information_create_from_reader (struct GNUNET_FS_Handle *h,
                                               void *client_info,
                                               uint64_t length,
                                               GNUNET_FS_DataReader reader,
                                               void *reader_cls,
                                               const struct GNUNET_FS_Uri
                                               *keywords,
                                               const struct
                                               GNUNET_CONTAINER_MetaData *meta,
                                               int do_index,
                                               const struct
                                               GNUNET_FS_BlockOptions *bo)
{
  struct GNUNET_FS_FileInformation *ret;

  if ((GNUNET_YES == do_index) && (reader != &GNUNET_FS_data_reader_file_))
  {
    GNUNET_break (0);
    return NULL;
  }
  ret = GNUNET_new (struct GNUNET_FS_FileInformation);
  ret->h = h;
  ret->client_info = client_info;
  ret->meta = GNUNET_CONTAINER_meta_data_duplicate (meta);
  if (ret->meta == NULL)
    ret->meta = GNUNET_CONTAINER_meta_data_create ();
  ret->keywords = (keywords == NULL) ? NULL : GNUNET_FS_uri_dup (keywords);
  ret->data.file.reader = reader;
  ret->data.file.reader_cls = reader_cls;
  ret->data.file.do_index = do_index;
  ret->data.file.file_size = length;
  ret->bo = *bo;
  return ret;
}


/**
 * Test if a given entry represents a directory.
 *
 * @param ent check if this FI represents a directory
 * @return #GNUNET_YES if so, #GNUNET_NO if not
 */
int
GNUNET_FS_file_information_is_directory (const struct GNUNET_FS_FileInformation
                                         *ent)
{
  return ent->is_directory;
}


/**
 * Create an entry for an empty directory in a publish-structure.
 *
 * @param h handle to the file sharing subsystem
 * @param client_info initial value for the client-info value for this entry
 * @param meta metadata for the directory
 * @param keywords under which keywords should this directory be available
 *         directly; can be NULL
 * @param bo block options
 * @param filename name of the directory; can be NULL
 * @return publish structure entry for the directory , NULL on error
 */
struct GNUNET_FS_FileInformation *
GNUNET_FS_file_information_create_empty_directory (struct GNUNET_FS_Handle *h,
                                                   void *client_info,
                                                   const struct GNUNET_FS_Uri
                                                   *keywords,
                                                   const struct
                                                   GNUNET_CONTAINER_MetaData
                                                   *meta,
                                                   const struct
                                                   GNUNET_FS_BlockOptions *bo,
                                                   const char *filename)
{
  struct GNUNET_FS_FileInformation *ret;

  ret = GNUNET_new (struct GNUNET_FS_FileInformation);
  ret->h = h;
  ret->client_info = client_info;
  ret->meta = GNUNET_CONTAINER_meta_data_duplicate (meta);
  ret->keywords = GNUNET_FS_uri_dup (keywords);
  ret->bo = *bo;
  ret->is_directory = GNUNET_YES;
  if (filename != NULL)
    ret->filename = GNUNET_strdup (filename);
  return ret;
}


/**
 * Add an entry to a directory in a publish-structure.  Clients
 * should never modify publish structures that were passed to
 * #GNUNET_FS_publish_start already.
 *
 * @param dir the directory
 * @param ent the entry to add; the entry must not have been
 *            added to any other directory at this point and
 *            must not include @a dir in its structure
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
 */
int
GNUNET_FS_file_information_add (struct GNUNET_FS_FileInformation *dir,
                                struct GNUNET_FS_FileInformation *ent)
{
  if ((ent->dir != NULL) || (ent->next != NULL) || (dir->is_directory != GNUNET_YES))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  ent->dir = dir;
  ent->next = dir->data.dir.entries;
  dir->data.dir.entries = ent;
  dir->data.dir.dir_size = 0;
  return GNUNET_OK;
}


/**
 * Inspect a file or directory in a publish-structure.  Clients
 * should never modify publish structures that were passed to
 * #GNUNET_FS_publish_start already.  When called on a directory,
 * this function will FIRST call @a proc with information about
 * the directory itself and then for each of the files in the
 * directory (but not for files in subdirectories).  When called
 * on a file, @a proc will be called exactly once (with information
 * about the specific file).
 *
 * @param dir the directory
 * @param proc function to call on each entry
 * @param proc_cls closure for @a proc
 */
void
GNUNET_FS_file_information_inspect (struct GNUNET_FS_FileInformation *dir,
                                    GNUNET_FS_FileInformationProcessor proc,
                                    void *proc_cls)
{
  struct GNUNET_FS_FileInformation *pos;
  int no;

  no = GNUNET_NO;
  if (GNUNET_OK !=
      proc (proc_cls, dir,
            (dir->is_directory == GNUNET_YES) ? dir->data.dir.dir_size : dir->data.
            file.file_size,
	    dir->meta, &dir->keywords, &dir->bo,
            (dir->is_directory == GNUNET_YES) ? &no : &dir->data.file.do_index,
            &dir->client_info))
    return;
  if (dir->is_directory != GNUNET_YES)
    return;
  pos = dir->data.dir.entries;
  while (pos != NULL)
  {
    no = GNUNET_NO;
    if (GNUNET_OK !=
        proc (proc_cls, pos,
              (pos->is_directory == GNUNET_YES) ? pos->data.dir.dir_size : pos->data.
              file.file_size, pos->meta, &pos->keywords, &pos->bo,
              (pos->is_directory == GNUNET_YES) ? &no : &pos->data.file.do_index,
              &pos->client_info))
      break;
    pos = pos->next;
  }
}


/**
 * Destroy publish-structure.  Clients should never destroy publish
 * structures that were passed to #GNUNET_FS_publish_start already.
 *
 * @param fi structure to destroy
 * @param cleaner function to call on each entry in the structure
 *        (useful to clean up client_info); can be NULL; return
 *        values are ignored
 * @param cleaner_cls closure for @a cleaner
 */
void
GNUNET_FS_file_information_destroy (struct GNUNET_FS_FileInformation *fi,
                                    GNUNET_FS_FileInformationProcessor cleaner,
                                    void *cleaner_cls)
{
  struct GNUNET_FS_FileInformation *pos;
  int no;

  no = GNUNET_NO;
  if (GNUNET_YES == fi->is_directory)
  {
    /* clean up directory */
    while (NULL != (pos = fi->data.dir.entries))
    {
      fi->data.dir.entries = pos->next;
      GNUNET_FS_file_information_destroy (pos, cleaner, cleaner_cls);
    }
    /* clean up client-info */
    if (NULL != cleaner)
      cleaner (cleaner_cls, fi, fi->data.dir.dir_size, fi->meta, &fi->keywords,
               &fi->bo, &no, &fi->client_info);
    GNUNET_free_non_null (fi->data.dir.dir_data);
  }
  else
  {
    /* call clean-up function of the reader */
    if (NULL != fi->data.file.reader)
    {
      (void) fi->data.file.reader (fi->data.file.reader_cls, 0, 0, NULL, NULL);
      fi->data.file.reader = NULL;
    }
    /* clean up client-info */
    if (NULL != cleaner)
      cleaner (cleaner_cls, fi, fi->data.file.file_size, fi->meta,
               &fi->keywords, &fi->bo, &fi->data.file.do_index,
               &fi->client_info);
  }
  GNUNET_free_non_null (fi->filename);
  GNUNET_free_non_null (fi->emsg);
  GNUNET_free_non_null (fi->chk_uri);
  /* clean up serialization */
  if ((NULL != fi->serialization) && (0 != UNLINK (fi->serialization)))
    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "unlink",
                              fi->serialization);
  if (NULL != fi->keywords)
    GNUNET_FS_uri_destroy (fi->keywords);
  if (NULL != fi->meta)
    GNUNET_CONTAINER_meta_data_destroy (fi->meta);
  GNUNET_free_non_null (fi->serialization);
  if (NULL != fi->te)
  {
    GNUNET_FS_tree_encoder_finish (fi->te, NULL);
    fi->te = NULL;
  }
  GNUNET_free (fi);
}


/* end of fs_file_information.c */