Outline ![]()
Files ![]()
loading...
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
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** FileX Component */
/** */
/** Directory */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#ifdef FX_ENABLE_EXFAT
#include "fx_utility.h"
#include "fx_directory_exFAT.h"
#include "fx_directory.h"
#ifdef FX_ENABLE_FAULT_TOLERANT
#include "fx_fault_tolerant.h"
#endif /* FX_ENABLE_FAULT_TOLERANT */
#include "fx_utility.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_directory_exFAT_unicode_entry_write PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function writes the supplied directory entry to the specified */
/* logical sector and offset. */
/* */
/* INPUT */
/* */
/* media_ptr Media control block pointer */
/* entry_ptr Pointer to directory entry */
/* update_level Update level for entry write */
/* unicode_name Unicode file name */
/* unicode_length Length of unicode file name */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* _fx_utility_exFAT_cluster_free Release unused clusters */
/* _fx_utility_exFAT_name_hash_get Get name hash */
/* _fx_utility_FAT_entry_read Read a new FAT entry */
/* _fx_utility_logical_sector_flush Flush the written log sector */
/* _fx_utility_logical_sector_read Read directory sector */
/* _fx_utility_logical_sector_write Write directory sector */
/* _fx_utility_string_length_get Get string's length */
/* _fx_utility_16_unsigned_write Write a USHORT from memory */
/* _fx_utility_32_unsigned_write Write a ULONG from memory */
/* _fx_utility_64_unsigned_read Read a ULONG64 from memory */
/* _fx_fault_tolerant_add_dir_log Add directory redo log */
/* _fx_fault_tolerant_add_checksum_log Add checksum redo log */
/* */
/* CALLED BY */
/* */
/* FileX System Functions */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _fx_directory_exFAT_unicode_entry_write(FX_MEDIA *media_ptr, FX_DIR_ENTRY *entry_ptr,
UCHAR update_level, USHORT *unicode_name, UINT unicode_length)
{
UCHAR *work_ptr;
UCHAR *sector_base_ptr;
UINT status;
UINT i, j;
ULONG64 logical_sector;
ULONG relative_sector;
ULONG byte_offset;
ULONG cluster, next_cluster;
UINT total_entries;
UINT name_length;
UINT name_pos = 0;
UINT copy_size;
USHORT checksum = 0;
ULONG date_time;
UINT use_unicode = FX_FALSE;
#ifdef FX_ENABLE_FAULT_TOLERANT
UCHAR *changed_ptr; /* Points to the directory entry that needs to be updated. */
UINT changed_size; /* The amount of bytes changed */
ULONG changed_offset; /* Offset from the beginning of the sector. */
#endif /* FX_ENABLE_FAULT_TOLERANT */
/* Check if we have unicode file name available. */
if (unicode_name && unicode_length)
{
/* Set use unicode flag. */
use_unicode = FX_TRUE;
/* Save the length of the name. */
name_length = unicode_length;
}
else
{
/* Calculate the length of the name from the name string. */
name_length = _fx_utility_string_length_get(entry_ptr -> fx_dir_entry_name, FX_MAX_EX_FAT_NAME_LEN);
/* Check if name is valid. */
if (entry_ptr -> fx_dir_entry_name[name_length] != 0)
{
/* Invalid name, return error. */
return(FX_INVALID_NAME);
}
}
/* Pickup the byte offset of the entry. */
byte_offset = entry_ptr -> fx_dir_entry_byte_offset;
/* Pickup the logical sector of the entry. */
logical_sector = entry_ptr -> fx_dir_entry_log_sector;
/* Calculate the cluster that this logical sector is in. */
cluster = (ULONG)((logical_sector - media_ptr -> fx_media_data_sector_start) / (media_ptr -> fx_media_sectors_per_cluster)) + FX_FAT_ENTRY_START;
/* Calculate the relative cluster. */
relative_sector = (ULONG)(logical_sector - (((ULONG)media_ptr -> fx_media_data_sector_start) +
(((ULONG64)cluster - FX_FAT_ENTRY_START) *
((ULONG)media_ptr -> fx_media_sectors_per_cluster))));
/* Read the sector. */
status = _fx_utility_logical_sector_read(media_ptr, (ULONG64) logical_sector,
media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_DIRECTORY_SECTOR);
/* Determine if an error occurred. */
if (status != FX_SUCCESS)
{
/* Return the error status. */
return(status);
}
/* Setup a pointer into the buffer. */
sector_base_ptr = (UCHAR *)media_ptr -> fx_media_memory_buffer;
work_ptr = sector_base_ptr + (UINT)entry_ptr -> fx_dir_entry_byte_offset;
/* Build file entry fields. */
/* Check if we need to update EntryType field. */
if (update_level == UPDATE_FULL)
{
/* Set EntryType field to file directory. */
*work_ptr = FX_EXFAT_DIR_ENTRY_TYPE_FILE_DIRECTORY;
}
/* Check if we are request to delete the file. */
else if (update_level == UPDATE_DELETE)
{
/* Clear InUse bit. */
*work_ptr &= 0x7f;
}
/* Advance the pointer to the next field: SecondaryCount. */
work_ptr++;
/* Update SecondaryCount field. */
if (update_level == UPDATE_FULL)
{
/* Calculate the secondary entry count from file name length. */
total_entries = 1 + (name_length + 14) / 15;
/* Save SecondaryCount field. */
*work_ptr = (UCHAR)total_entries;
}
else
{
/* We are not performing a full update, read back the secondary entry count. */
total_entries = *work_ptr;
}
/* Advance the pointer to the next field. */
work_ptr++;
/* Skip SetChecksum field. */
work_ptr += 2;
/* Check if we need to update FileAttributes field. */
if (update_level >= UPDATE_FILE)
{
/* Write the file attributes field. */
_fx_utility_16_unsigned_write(work_ptr, entry_ptr -> fx_dir_entry_attributes);
}
/* Advance the pointer to the next field. */
work_ptr += 2;
/* Check if we need to perform full entry update. */
if (update_level == UPDATE_FULL)
{
/* Clear Reserved1 field. */
_fx_utility_16_unsigned_write(work_ptr, 0);
}
/* Advance the pointer to the next field. */
work_ptr += 2;
/* Check if we need to update the CreateTimestamp field. */
if (update_level >= UPDATE_FILE)
{
/* Calculate and update CreateTimestamp field. */
date_time = ((ULONG)entry_ptr -> fx_dir_entry_created_date << 16) |
(ULONG)entry_ptr -> fx_dir_entry_created_time;
_fx_utility_32_unsigned_write(work_ptr, date_time);
}
/* Advance the pointer to the next field. */
work_ptr += 4;
/* Check if we need to update LastModifiedTimestamp field. */
if (update_level >= UPDATE_FILE)
{
/* Calculate and update LastModifiedTimestamp field. */
date_time = ((ULONG)entry_ptr -> fx_dir_entry_date << 16) |
(ULONG)entry_ptr -> fx_dir_entry_time;
_fx_utility_32_unsigned_write(work_ptr, date_time);
}
/* Advance the pointer to the next field. */
work_ptr += 4;
/* Check if we need to update LastAccessedTimestamp field. */
if (update_level >= UPDATE_FILE)
{
/* Calculate and update LastAccessedTimestamp field. */
date_time = ((ULONG)entry_ptr -> fx_dir_entry_date << 16) |
(ULONG)entry_ptr -> fx_dir_entry_time; /* use modified as accessed */
_fx_utility_32_unsigned_write(work_ptr, date_time);
}
/* Advance the pointer to the next field. */
work_ptr += 4;
/* Check if we need to update Create10msIncrement field. */
if (update_level >= UPDATE_FILE)
{
/* Update Create10msIncrement field. */
*work_ptr = entry_ptr -> fx_dir_entry_created_time_ms;
}
/* Advance the pointer to the next field. */
work_ptr++;
/* Check if we need to perform full entry update. */
if (update_level >= UPDATE_FILE)
{
/* 10ms increment field is not supported, clear this field. */
*work_ptr = 0;
}
/* Advance the pointer to the next field. */
work_ptr++;
/* Check if we need to perform full entry update. */
if (update_level == UPDATE_FULL)
{
/*CreateUtcOffset field is not supported, clear this field. */
*work_ptr = 0;
}
/* Advance the pointer to the next field. */
work_ptr++;
/* Check if we need to perform full entry update. */
if (update_level >= UPDATE_FILE)
{
/* LastModifiedUtcOffset field is not supported, clear this field. */
*work_ptr = 0;
}
/* Advance the pointer to the next field. */
work_ptr++;
/* Check if we need to perform full entry update. */
if (update_level == UPDATE_FULL)
{
/* LastModifiedUtcOffset field is not supported, clear this field. */
*work_ptr = 0; /* Not supported. */
}
/* Advance the pointer to the next field. */
work_ptr++;
/* Clear Reserved2 field. */
if (update_level == UPDATE_FULL)
{
/* Loop to clear the reserved field. */
for (i = 0; i < 7; ++i)
{
/* Clear the reserved field. */
*work_ptr = 0;
work_ptr++;
}
}
else
{
/* Skip the reserved field. */
work_ptr += 7;
}
/* Calculate checksum. */
work_ptr -= FX_DIR_ENTRY_SIZE;
/* Loop to calculate the entry checksum. */
for (j = 0; j < FX_DIR_ENTRY_SIZE; ++j)
{
/* Skip the checksum field. */
if ((j == 2) || (j == 3))
{
continue;
}
/* Calculate the checksum using the algorithm described in the specification. */
/* Right rotate the checksum by one bit position and add the data. */
checksum = (USHORT)(((checksum >> 1) | (checksum << 15)) + work_ptr[j]);
}
#ifdef FX_ENABLE_FAULT_TOLERANT
/* Initialize variables for fault tolerant. */
changed_ptr = work_ptr;
changed_offset = entry_ptr -> fx_dir_entry_byte_offset;
changed_size = 0;
#endif /* FX_ENABLE_FAULT_TOLERANT */
/* Update second entries. */
for (i = 0; i < total_entries; ++i)
{
/* Advance the pointer and offset to next directory entry. */
work_ptr += FX_DIR_ENTRY_SIZE;
byte_offset += FX_DIR_ENTRY_SIZE;
#ifdef FX_ENABLE_FAULT_TOLERANT
/* Update changed_size. */
changed_size += FX_DIR_ENTRY_SIZE;
#endif /* FX_ENABLE_FAULT_TOLERANT */
/* Determine if the entry overlaps into the next sector. */
if (byte_offset >= media_ptr -> fx_media_bytes_per_sector)
{
#ifdef FX_ENABLE_FAULT_TOLERANT
if (media_ptr -> fx_media_fault_tolerant_enabled &&
(media_ptr -> fx_media_fault_tolerant_state & FX_FAULT_TOLERANT_STATE_STARTED))
{
/* Redirect this request to log file. */
status = _fx_fault_tolerant_add_dir_log(media_ptr, logical_sector, changed_offset, changed_ptr, changed_size);
}
else
#endif /* FX_ENABLE_FAULT_TOLERANT */
{
/* Write current logical sector out. */
status = _fx_utility_logical_sector_write(media_ptr, logical_sector,
sector_base_ptr, ((ULONG) 1), FX_DIRECTORY_SECTOR);
}
/* Determine if an error occurred. */
if (status != FX_SUCCESS)
{
/* Return the error status. */
return(status);
}
/* Determine the next sector of the directory entry. */
if (relative_sector < (media_ptr -> fx_media_sectors_per_cluster - 1))
{
/* More sectors in this cluster. */
/* Simply increment the logical sector. */
logical_sector++;
/* Increment the relative sector. */
relative_sector++;
}
else
{
/* We need to move to the next cluster. */
if ((entry_ptr -> fx_dir_entry_dont_use_fat >> 1) & 1) /* Check parent dont_use_fat flag. */
{
/* FAT is not used, next cluster is after the current cluster. */
next_cluster = cluster + 1;
}
else
{
/* FAT is used, read FAT to get the next cluster. */
status = _fx_utility_FAT_entry_read(media_ptr, cluster, &next_cluster);
/* Check for I/O error. */
if (status != FX_SUCCESS)
{
/* Return error code. */
return(status);
}
}
/* Copy next cluster to the current cluster. */
cluster = next_cluster;
/* Check the value of the new cluster - it must be a valid cluster number
or something is really wrong! */
if ((cluster < FX_FAT_ENTRY_START) || (cluster > FX_RESERVED_1_exFAT))
{
/* Send error message back to caller. */
return(FX_FILE_CORRUPT);
}
/* Setup the relative sector (this is zero for subsequent cluster. */
relative_sector = 0;
/* Calculate the next logical sector. */
logical_sector = ((ULONG)media_ptr -> fx_media_data_sector_start) +
(((ULONG64)cluster - FX_FAT_ENTRY_START) *
((ULONG)media_ptr -> fx_media_sectors_per_cluster));
}
/* Read the sector. */
status = _fx_utility_logical_sector_read(media_ptr, (ULONG64) logical_sector,
media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_DIRECTORY_SECTOR);
/* Determine if an error occurred. */
if (status != FX_SUCCESS)
{
/* Return the error status. */
return(status);
}
/* Setup logical sector. */
sector_base_ptr = media_ptr -> fx_media_memory_buffer;
/* Setup a fresh byte offset. */
byte_offset = 0;
/* Setup a new pointer into the buffer. */
work_ptr = sector_base_ptr;
#ifdef FX_ENABLE_FAULT_TOLERANT
/* Initialize data for fault tolerant. */
changed_ptr = work_ptr;
changed_size = 0;
changed_offset = 0;
#endif /* FX_ENABLE_FAULT_TOLERANT */
}
/* Check if we are processing the first secondary entry. */
if (i == 0)
{
/* First sub entry is stream entry. */
/* Check if we need to perform full entry update. */
if (update_level == UPDATE_FULL)
{
/* Set the EntryType field to stream extension type. */
*work_ptr = FX_EXFAT_DIR_ENTRY_TYPE_STREAM_EXTENSION;
}
else if (update_level == UPDATE_DELETE)
{
/* Clear InUse bit. */
*work_ptr &= 0x7f;
}
/* Advance the pointer to the next field. */
work_ptr++;
/* Update GeneralSecondaryFlags field. */
if (update_level >= UPDATE_STREAM)
{
/* Check if FAT is used and the entry has associated cluster. */
if ((entry_ptr -> fx_dir_entry_dont_use_fat & 1) && (entry_ptr -> fx_dir_entry_cluster != 0))
{
/* Set the flags to don't use FAT. */
*work_ptr = 3;
}
else
{
/* FAT is used. */
*work_ptr = 1;
}
}
/* Advance the pointer to the next field. */
work_ptr++;
/* Check if we need to perform full entry update. */
if (update_level == UPDATE_FULL)
{
/* Clear Reserved1 field. */
*work_ptr = 0;
}
/* Advance the pointer to the next field. */
work_ptr++;
/* Check if we need to update NameLength field. */
if (update_level >= UPDATE_NAME)
{
/* Update NameLength field. */
*work_ptr = (UCHAR)name_length;
}
/* Advance the pointer to the next field. */
work_ptr++;
/* Check if we need to update NameHash field. */
if (update_level >= UPDATE_NAME)
{
/* Check if the supplied file name is in unicode format. */
if (use_unicode)
{
/* Update NameHash field. */
_fx_utility_16_unsigned_write(work_ptr, _fx_utility_exFAT_unicode_name_hash_get((CHAR *)unicode_name, name_length));
}
else
{
/* Update NameHash field. */
_fx_utility_16_unsigned_write(work_ptr, _fx_utility_exFAT_name_hash_get(entry_ptr -> fx_dir_entry_name));
}
}
/* Advance the pointer to the next field. */
work_ptr += 2;
/* Check if we need to perform full entry update. */
if (update_level == UPDATE_FULL)
{
/* Clear Reserved2 field. */
_fx_utility_16_unsigned_write(work_ptr, 0);
}
/* Advance the pointer to the next field. */
work_ptr += 2;
/* Check if we need to update ValidDataLength field. */
if (update_level >= UPDATE_STREAM)
{
/* Update ValidDataLength field. */
_fx_utility_64_unsigned_write(work_ptr, entry_ptr -> fx_dir_entry_file_size);
}
/* Advance the pointer to the next field. */
work_ptr += 8;
/* Check if we need to perform full entry update. */
if (update_level == UPDATE_FULL)
{
/* Clear Reserved3 field. */
_fx_utility_32_unsigned_write(work_ptr, 0);
}
/* Advance the pointer to the next field. */
work_ptr += 4;
/* Check if we need to update FirstCluster field. */
if (update_level >= UPDATE_STREAM)
{
/* Update FirstCluster field. */
_fx_utility_32_unsigned_write(work_ptr, entry_ptr -> fx_dir_entry_cluster);
}
/* Advance the pointer to the next field. */
work_ptr += 4;
/* Update DataLength fields. */
if (update_level >= UPDATE_STREAM)
{
/* Update DataLength fields. */
_fx_utility_64_unsigned_write(work_ptr, entry_ptr -> fx_dir_entry_available_file_size);
_fx_utility_64_unsigned_write(work_ptr, entry_ptr -> fx_dir_entry_file_size);
}
/* Advance the pointer to the next field. */
work_ptr += 8;
}
else
{
/* Check if we are requested to delete the entries. */
if (update_level == UPDATE_DELETE)
{
/* Check the directory entry type. */
if ((*work_ptr != FX_EXFAT_DIR_ENTRY_TYPE_FILE_NAME) && (*work_ptr != FX_EXFAT_DIR_ENTRY_TYPE_STREAM_EXTENSION))
{
/* Unknown secondary, we should free used clusters if any. */
status = _fx_utility_exFAT_cluster_free(media_ptr, work_ptr);
if (status != FX_SUCCESS)
{
/* Return completion status. */
return(status);
}
}
/* Clear InUse bit. */
*work_ptr &= 0x7f;
work_ptr += FX_DIR_ENTRY_SIZE;
}
/* Check if we need to update the file name. */
else if ((update_level == UPDATE_FULL) ||
((update_level == UPDATE_NAME) && (*work_ptr == FX_EXFAT_DIR_ENTRY_TYPE_FILE_NAME)))
{
/* Build Name entry. */
/* Update EntryType field. */
*work_ptr = FX_EXFAT_DIR_ENTRY_TYPE_FILE_NAME;
work_ptr++;
/* Update GeneralSecondaryFlags field. */
*work_ptr = 0;
work_ptr++;
/* Update FileName field. */
/* One name entry can hold up to 15 characters. Set how many characters to copy. */
if (name_length > 15)
{
copy_size = 15;
}
else
{
copy_size = name_length;
}
/* Check if the supplied file name is in unicode format. */
if (use_unicode)
{
/* Loop to copy the unicode file name. */
for (j = 0; j < copy_size; ++j)
{
/* Copy unicode file name to the file name entry. */
_fx_utility_16_unsigned_write(work_ptr, (UINT)unicode_name[name_pos++]);
work_ptr += 2;
}
}
else
{
/* Loop to copy non-unicode file name. */
for (j = 0; j < copy_size; ++j)
{
/* Copy and convert non-unicode file name. */
_fx_utility_16_unsigned_write(work_ptr, (UINT)entry_ptr -> fx_dir_entry_name[name_pos++]);
work_ptr += 2;
}
}
/* Loop to clear remaining bytes. */
for (j = copy_size; j < 15; ++j)
{
/* Clear the remaining bytes. */
_fx_utility_16_unsigned_write(work_ptr, 0);
work_ptr += 2;
}
/* Modify the name_length to indicate the remaining length. */
name_length -= copy_size;
}
else
{
/* The entry does need to be updated, move to next entry. */
work_ptr += FX_DIR_ENTRY_SIZE;
}
}
/* Set pointer back for checksum calculation. */
work_ptr -= FX_DIR_ENTRY_SIZE;
/* Loop to calculate the checksum. */
for (j = 0; j < FX_DIR_ENTRY_SIZE; ++j)
{
/* Calculate the checksum. */
/* Right rotate the checksum by one bit position and add the data. */
checksum = (USHORT)(((checksum >> 1) | (checksum << 15)) + work_ptr[j]);
}
}
#ifdef FX_ENABLE_FAULT_TOLERANT
/* Update changed_size. */
changed_size += FX_DIR_ENTRY_SIZE;
#endif /* FX_ENABLE_FAULT_TOLERANT */
/* Go back to file entry. */
if (byte_offset < total_entries * FX_DIR_ENTRY_SIZE)
{
#ifdef FX_ENABLE_FAULT_TOLERANT
if (media_ptr -> fx_media_fault_tolerant_enabled &&
(media_ptr -> fx_media_fault_tolerant_state & FX_FAULT_TOLERANT_STATE_STARTED))
{
/* Redirect this request to log file. */
status = _fx_fault_tolerant_add_dir_log(media_ptr, logical_sector, changed_offset, changed_ptr, changed_size);
}
else
#endif /* FX_ENABLE_FAULT_TOLERANT */
{
/* Write current logical sector out. */
status = _fx_utility_logical_sector_write(media_ptr, logical_sector,
sector_base_ptr, ((ULONG) 1), FX_DIRECTORY_SECTOR);
}
/* Determine if an error occurred. */
if (status != FX_SUCCESS)
{
/* Return the error status. */
return(status);
}
/* Pickup the byte offset of the entry. */
byte_offset = entry_ptr -> fx_dir_entry_byte_offset;
/* Pickup the logical sector of the entry. */
logical_sector = entry_ptr -> fx_dir_entry_log_sector;
/* Calculate the cluster that this logical sector is in. */
cluster = (ULONG)((logical_sector - media_ptr -> fx_media_data_sector_start) / (media_ptr -> fx_media_sectors_per_cluster)) + FX_FAT_ENTRY_START;
/* Calculate the relative cluster. */
relative_sector = (ULONG)(logical_sector - (((ULONG)media_ptr -> fx_media_data_sector_start) +
(((ULONG64)cluster - FX_FAT_ENTRY_START) *
((ULONG)media_ptr -> fx_media_sectors_per_cluster))));
/* Read the sector. */
status = _fx_utility_logical_sector_read(media_ptr, (ULONG64) logical_sector,
media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_DIRECTORY_SECTOR);
/* Determine if an error occurred. */
if (status != FX_SUCCESS)
{
/* Return the error status. */
return(status);
}
/* Setup logical sector. */
sector_base_ptr = media_ptr -> fx_media_memory_buffer;
#ifdef FX_ENABLE_FAULT_TOLERANT
/* Initialize data for fault tolerant. */
/* A log for checksum. */
changed_ptr = sector_base_ptr + byte_offset + 2;
changed_size = 2;
changed_offset = byte_offset + 2;
#endif /* FX_ENABLE_FAULT_TOLERANT */
}
else
{
/* The directory entries are not crossing sector boundary, just adjust the pointer to go back to the first entry. */
byte_offset -= total_entries * FX_DIR_ENTRY_SIZE;
}
/* Setup work pointer to the directory entry. */
work_ptr = sector_base_ptr + byte_offset;
/* Store SetChecksum field. */
work_ptr += 2;
_fx_utility_16_unsigned_write(work_ptr, checksum);
#ifdef FX_ENABLE_FAULT_TOLERANT
if (media_ptr -> fx_media_fault_tolerant_enabled &&
(media_ptr -> fx_media_fault_tolerant_state & FX_FAULT_TOLERANT_STATE_STARTED))
{
if (changed_size == 2)
{
/* Only checksum. */
/* Redirect this request to log file. */
status = _fx_fault_tolerant_add_checksum_log(media_ptr, logical_sector, changed_offset, checksum);
}
else
{
/* Redirect this request to log file. */
status = _fx_fault_tolerant_add_dir_log(media_ptr, logical_sector, changed_offset, changed_ptr, changed_size);
}
}
else
#endif /* FX_ENABLE_FAULT_TOLERANT */
{
/* Write current logical sector out. */
status = _fx_utility_logical_sector_write(media_ptr, logical_sector,
sector_base_ptr, ((ULONG) 1), FX_DIRECTORY_SECTOR);
}
/* Determine if an error occurred. */
if (status != FX_SUCCESS)
{
/* Return the error status. */
return(status);
}
/* Check if there is a default path. */
if (media_ptr -> fx_media_default_path.fx_path_directory.fx_dir_entry_name[0])
{
/* Check default path directory was updated. */
if ((media_ptr -> fx_media_default_path.fx_path_directory.fx_dir_entry_log_sector ==
entry_ptr -> fx_dir_entry_log_sector) &&
(media_ptr -> fx_media_default_path.fx_path_directory.fx_dir_entry_byte_offset ==
entry_ptr -> fx_dir_entry_byte_offset))
{
/* Update default path. */
media_ptr -> fx_media_default_path.fx_path_directory.fx_dir_entry_file_size =
entry_ptr -> fx_dir_entry_file_size;
media_ptr -> fx_media_default_path.fx_path_directory.fx_dir_entry_available_file_size =
entry_ptr -> fx_dir_entry_available_file_size;
media_ptr -> fx_media_default_path.fx_path_directory.fx_dir_entry_dont_use_fat =
entry_ptr -> fx_dir_entry_dont_use_fat;
media_ptr -> fx_media_default_path.fx_path_directory.fx_dir_entry_cluster =
entry_ptr -> fx_dir_entry_cluster;
}
}
#ifndef FX_MEDIA_DISABLE_SEARCH_CACHE
/* Determine if there is a previously found directory entry in the directory
search cache. */
if (media_ptr -> fx_media_last_found_name[0])
{
/* Determine if the cached search directory entry matches the directory entry being
written. */
if ((entry_ptr -> fx_dir_entry_log_sector == media_ptr -> fx_media_last_found_entry.fx_dir_entry_log_sector) &&
(entry_ptr -> fx_dir_entry_byte_offset == media_ptr -> fx_media_last_found_entry.fx_dir_entry_byte_offset))
{
/* Yes, this entry is the same as the one currently in the directory search cache.
Update various fields in the directory search cache with the information being
written now. */
media_ptr -> fx_media_last_found_entry.fx_dir_entry_cluster = entry_ptr -> fx_dir_entry_cluster;
media_ptr -> fx_media_last_found_entry.fx_dir_entry_file_size = entry_ptr -> fx_dir_entry_file_size;
media_ptr -> fx_media_last_found_entry.fx_dir_entry_attributes = entry_ptr -> fx_dir_entry_attributes;
media_ptr -> fx_media_last_found_entry.fx_dir_entry_time = entry_ptr -> fx_dir_entry_time;
media_ptr -> fx_media_last_found_entry.fx_dir_entry_date = entry_ptr -> fx_dir_entry_date;
media_ptr -> fx_media_last_found_entry.fx_dir_entry_reserved = entry_ptr -> fx_dir_entry_reserved;
media_ptr -> fx_media_last_found_entry.fx_dir_entry_created_time_ms = entry_ptr -> fx_dir_entry_created_time_ms;
media_ptr -> fx_media_last_found_entry.fx_dir_entry_created_time = entry_ptr -> fx_dir_entry_created_time;
media_ptr -> fx_media_last_found_entry.fx_dir_entry_created_date = entry_ptr -> fx_dir_entry_created_date;
media_ptr -> fx_media_last_found_entry.fx_dir_entry_dont_use_fat = entry_ptr -> fx_dir_entry_dont_use_fat;
media_ptr -> fx_media_last_found_entry.fx_dir_entry_type = entry_ptr -> fx_dir_entry_type;
media_ptr -> fx_media_last_found_entry.fx_dir_entry_available_file_size = entry_ptr -> fx_dir_entry_available_file_size;
}
}
#endif
/* Return success to the caller. */
return(status);
}
#endif
Details ![]()
Show: from Types: Columns: ![]( "Show Project Names")
![]( "Show Locations")
![]( "Show Referring Symbols")
![]( "Show Scope")
This file uses the notable symbols shown below. Click anywhere in the file to view more details.