]>
Commit | Line | Data |
---|---|---|
b9ec9330 QH |
1 | /*++\r |
2 | \r | |
6163cc98 HT |
3 | Copyright (c) 2005 - 2009, Intel Corporation. All rights reserved.<BR>\r |
4 | This program and the accompanying materials are licensed and made available\r | |
b9ec9330 QH |
5 | under the terms and conditions of the BSD License which accompanies this\r |
6 | distribution. The full text of the license may be found at\r | |
7 | http://opensource.org/licenses/bsd-license.php\r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | \r | |
12 | \r | |
13 | Module Name:\r | |
14 | \r | |
15 | ReadWrite.c\r | |
16 | \r | |
17 | Abstract:\r | |
18 | \r | |
19 | Functions that perform file read/write\r | |
20 | \r | |
21 | Revision History\r | |
22 | \r | |
23 | --*/\r | |
24 | \r | |
25 | #include "Fat.h"\r | |
26 | \r | |
27 | EFI_STATUS\r | |
28 | EFIAPI\r | |
29 | FatGetPosition (\r | |
dba03ba1 | 30 | IN EFI_FILE_PROTOCOL *FHand,\r |
b9ec9330 QH |
31 | OUT UINT64 *Position\r |
32 | )\r | |
33 | /*++\r | |
34 | \r | |
35 | Routine Description:\r | |
36 | \r | |
37 | Get the file's position of the file.\r | |
38 | \r | |
39 | Arguments:\r | |
40 | \r | |
41 | FHand - The handle of file.\r | |
42 | Position - The file's position of the file.\r | |
43 | \r | |
44 | Returns:\r | |
45 | \r | |
46 | EFI_SUCCESS - Get the info successfully.\r | |
47 | EFI_DEVICE_ERROR - Can not find the OFile for the file.\r | |
48 | EFI_UNSUPPORTED - The open file is not a file.\r | |
49 | \r | |
50 | --*/\r | |
51 | {\r | |
52 | FAT_IFILE *IFile;\r | |
53 | FAT_OFILE *OFile;\r | |
54 | \r | |
55 | IFile = IFILE_FROM_FHAND (FHand);\r | |
56 | OFile = IFile->OFile;\r | |
57 | \r | |
58 | if (OFile->Error == EFI_NOT_FOUND) {\r | |
59 | return EFI_DEVICE_ERROR;\r | |
60 | }\r | |
61 | \r | |
62 | if (OFile->ODir != NULL) {\r | |
63 | return EFI_UNSUPPORTED;\r | |
64 | }\r | |
65 | \r | |
66 | *Position = IFile->Position;\r | |
67 | return EFI_SUCCESS;\r | |
68 | }\r | |
69 | \r | |
70 | EFI_STATUS\r | |
71 | EFIAPI\r | |
72 | FatSetPosition (\r | |
dba03ba1 QH |
73 | IN EFI_FILE_PROTOCOL *FHand,\r |
74 | IN UINT64 Position\r | |
b9ec9330 QH |
75 | )\r |
76 | /*++\r | |
77 | \r | |
78 | Routine Description:\r | |
79 | \r | |
80 | Set the file's position of the file.\r | |
81 | \r | |
82 | Arguments:\r | |
83 | \r | |
84 | FHand - The handle of file.\r | |
85 | Position - The file's position of the file.\r | |
86 | \r | |
87 | Returns:\r | |
88 | \r | |
89 | EFI_SUCCESS - Set the info successfully.\r | |
90 | EFI_DEVICE_ERROR - Can not find the OFile for the file.\r | |
91 | EFI_UNSUPPORTED - Set a directory with a not-zero position.\r | |
92 | \r | |
93 | --*/\r | |
94 | {\r | |
95 | FAT_IFILE *IFile;\r | |
96 | FAT_OFILE *OFile;\r | |
97 | \r | |
98 | IFile = IFILE_FROM_FHAND (FHand);\r | |
99 | OFile = IFile->OFile;\r | |
100 | \r | |
101 | if (OFile->Error == EFI_NOT_FOUND) {\r | |
102 | return EFI_DEVICE_ERROR;\r | |
103 | }\r | |
104 | //\r | |
105 | // If this is a directory, we can only set back to position 0\r | |
106 | //\r | |
107 | if (OFile->ODir != NULL) {\r | |
108 | if (Position != 0) {\r | |
109 | //\r | |
110 | // Reset current directory cursor;\r | |
111 | //\r | |
112 | return EFI_UNSUPPORTED;\r | |
113 | }\r | |
114 | \r | |
115 | FatResetODirCursor (OFile);\r | |
116 | }\r | |
117 | //\r | |
118 | // Set the position\r | |
119 | //\r | |
c4ba493e | 120 | if (Position == (UINT64)-1) {\r |
b9ec9330 QH |
121 | Position = OFile->FileSize;\r |
122 | }\r | |
123 | //\r | |
124 | // Set the position\r | |
125 | //\r | |
126 | IFile->Position = Position;\r | |
127 | return EFI_SUCCESS;\r | |
128 | }\r | |
129 | \r | |
130 | EFI_STATUS\r | |
131 | FatIFileReadDir (\r | |
132 | IN FAT_IFILE *IFile,\r | |
133 | IN OUT UINTN *BufferSize,\r | |
134 | OUT VOID *Buffer\r | |
135 | )\r | |
136 | /*++\r | |
137 | \r | |
138 | Routine Description:\r | |
139 | \r | |
140 | Get the file info from the open file of the IFile into Buffer.\r | |
141 | \r | |
142 | Arguments:\r | |
143 | \r | |
144 | IFile - The instance of the open file.\r | |
145 | BufferSize - Size of Buffer.\r | |
146 | Buffer - Buffer containing read data.\r | |
147 | \r | |
148 | Returns:\r | |
149 | \r | |
150 | EFI_SUCCESS - Get the file info successfully.\r | |
151 | other - An error occurred when operation the disk.\r | |
152 | \r | |
153 | --*/\r | |
154 | {\r | |
155 | EFI_STATUS Status;\r | |
156 | FAT_OFILE *OFile;\r | |
157 | FAT_ODIR *ODir;\r | |
158 | FAT_DIRENT *DirEnt;\r | |
159 | UINT32 CurrentPos;\r | |
160 | \r | |
161 | OFile = IFile->OFile;\r | |
162 | ODir = OFile->ODir;\r | |
163 | CurrentPos = ((UINT32) IFile->Position) / sizeof (FAT_DIRECTORY_ENTRY);\r | |
164 | \r | |
165 | //\r | |
166 | // We need to relocate the directory\r | |
167 | //\r | |
168 | if (CurrentPos < ODir->CurrentPos) {\r | |
169 | //\r | |
170 | // The directory cursor has been modified by another IFile, we reset the cursor\r | |
171 | //\r | |
172 | FatResetODirCursor (OFile);\r | |
173 | }\r | |
174 | //\r | |
175 | // We seek the next directory entry's position\r | |
176 | //\r | |
177 | do {\r | |
178 | Status = FatGetNextDirEnt (OFile, &DirEnt);\r | |
179 | if (EFI_ERROR (Status) || DirEnt == NULL) {\r | |
180 | //\r | |
181 | // Something error occurred or reach the end of directory,\r | |
182 | // return 0 buffersize\r | |
183 | //\r | |
184 | *BufferSize = 0;\r | |
185 | goto Done;\r | |
186 | }\r | |
187 | } while (ODir->CurrentPos <= CurrentPos);\r | |
188 | Status = FatGetDirEntInfo (OFile->Volume, DirEnt, BufferSize, Buffer);\r | |
189 | \r | |
190 | Done:\r | |
191 | //\r | |
192 | // Update IFile's Position\r | |
193 | //\r | |
194 | if (!EFI_ERROR (Status)) {\r | |
195 | //\r | |
196 | // Update IFile->Position, if everything is all right\r | |
197 | //\r | |
198 | CurrentPos = ODir->CurrentPos;\r | |
199 | IFile->Position = (UINT64) (CurrentPos * sizeof (FAT_DIRECTORY_ENTRY));\r | |
200 | }\r | |
201 | \r | |
202 | return Status;\r | |
203 | }\r | |
204 | \r | |
205 | EFI_STATUS\r | |
206 | FatIFileAccess (\r | |
dba03ba1 | 207 | IN EFI_FILE_PROTOCOL *FHand,\r |
b9ec9330 QH |
208 | IN IO_MODE IoMode,\r |
209 | IN OUT UINTN *BufferSize,\r | |
210 | IN OUT VOID *Buffer\r | |
211 | )\r | |
212 | /*++\r | |
213 | \r | |
214 | Routine Description:\r | |
215 | \r | |
216 | Get the file info from the open file of the IFile into Buffer.\r | |
217 | \r | |
218 | Arguments:\r | |
219 | \r | |
220 | FHand - The file handle to access.\r | |
221 | IoMode - Indicate whether the access mode is reading or writing.\r | |
222 | BufferSize - Size of Buffer.\r | |
223 | Buffer - Buffer containing read data.\r | |
224 | \r | |
225 | Returns:\r | |
226 | \r | |
227 | EFI_SUCCESS - Get the file info successfully.\r | |
228 | EFI_DEVICE_ERROR - Can not find the OFile for the file.\r | |
229 | EFI_VOLUME_CORRUPTED - The file type of open file is error.\r | |
230 | EFI_WRITE_PROTECTED - The disk is write protect.\r | |
231 | EFI_ACCESS_DENIED - The file is read-only.\r | |
232 | other - An error occurred when operating on the disk.\r | |
233 | \r | |
234 | --*/\r | |
235 | {\r | |
236 | EFI_STATUS Status;\r | |
237 | FAT_IFILE *IFile;\r | |
238 | FAT_OFILE *OFile;\r | |
239 | FAT_VOLUME *Volume;\r | |
240 | UINT64 EndPosition;\r | |
241 | \r | |
242 | IFile = IFILE_FROM_FHAND (FHand);\r | |
243 | OFile = IFile->OFile;\r | |
244 | Volume = OFile->Volume;\r | |
245 | \r | |
246 | if (OFile->Error == EFI_NOT_FOUND) {\r | |
247 | return EFI_DEVICE_ERROR;\r | |
248 | }\r | |
249 | \r | |
250 | if (IoMode == READ_DATA) {\r | |
251 | //\r | |
252 | // If position is at EOF, then return device error\r | |
253 | //\r | |
254 | if (IFile->Position > OFile->FileSize) {\r | |
255 | return EFI_DEVICE_ERROR;\r | |
256 | }\r | |
257 | } else {\r | |
258 | //\r | |
259 | // Check if the we can write data\r | |
260 | //\r | |
261 | if (Volume->ReadOnly) {\r | |
262 | return EFI_WRITE_PROTECTED;\r | |
263 | }\r | |
264 | \r | |
265 | if (IFile->ReadOnly) {\r | |
266 | return EFI_ACCESS_DENIED;\r | |
267 | }\r | |
268 | }\r | |
269 | \r | |
270 | FatAcquireLock ();\r | |
271 | \r | |
272 | Status = OFile->Error;\r | |
273 | if (!EFI_ERROR (Status)) {\r | |
274 | if (OFile->ODir != NULL) {\r | |
275 | //\r | |
276 | // Access a directory\r | |
277 | //\r | |
278 | Status = EFI_UNSUPPORTED;\r | |
279 | if (IoMode == READ_DATA) {\r | |
280 | //\r | |
281 | // Read a directory is supported\r | |
282 | //\r | |
283 | Status = FatIFileReadDir (IFile, BufferSize, Buffer);\r | |
284 | }\r | |
285 | \r | |
286 | OFile = NULL;\r | |
287 | } else {\r | |
288 | //\r | |
289 | // Access a file\r | |
290 | //\r | |
291 | EndPosition = IFile->Position + *BufferSize;\r | |
292 | if (EndPosition > OFile->FileSize) {\r | |
293 | //\r | |
294 | // The position goes beyond the end of file\r | |
295 | //\r | |
296 | if (IoMode == READ_DATA) {\r | |
297 | //\r | |
298 | // Adjust the actual size read\r | |
299 | //\r | |
300 | *BufferSize -= (UINTN) EndPosition - OFile->FileSize;\r | |
301 | } else {\r | |
302 | //\r | |
303 | // We expand the file size of OFile\r | |
304 | //\r | |
305 | Status = FatGrowEof (OFile, EndPosition);\r | |
306 | if (EFI_ERROR (Status)) {\r | |
307 | //\r | |
308 | // Must update the file's info into the file's Directory Entry\r | |
309 | // and then flush the dirty cache info into disk.\r | |
310 | //\r | |
311 | *BufferSize = 0;\r | |
312 | FatOFileFlush (OFile);\r | |
313 | OFile = NULL;\r | |
314 | goto Done;\r | |
315 | }\r | |
316 | \r | |
317 | FatUpdateDirEntClusterSizeInfo (OFile);\r | |
318 | }\r | |
319 | }\r | |
320 | \r | |
321 | Status = FatAccessOFile (OFile, IoMode, (UINTN) IFile->Position, BufferSize, Buffer);\r | |
322 | IFile->Position += *BufferSize;\r | |
323 | }\r | |
324 | }\r | |
325 | \r | |
326 | Done:\r | |
327 | if (EFI_ERROR (Status)) {\r | |
328 | Status = FatCleanupVolume (Volume, OFile, Status);\r | |
329 | }\r | |
330 | //\r | |
331 | // On EFI_SUCCESS case, not calling FatCleanupVolume():\r | |
332 | // 1) The Cache flush operation is avoided to enhance\r | |
333 | // performance. Caller is responsible to call Flush() when necessary.\r | |
334 | // 2) The volume dirty bit is probably set already, and is expected to be\r | |
335 | // cleaned in subsequent Flush() or other operations.\r | |
336 | // 3) Write operation doesn't affect OFile/IFile structure, so\r | |
337 | // Reference checking is not necessary.\r | |
338 | //\r | |
339 | FatReleaseLock ();\r | |
340 | return Status;\r | |
341 | }\r | |
342 | \r | |
343 | EFI_STATUS\r | |
344 | EFIAPI\r | |
345 | FatRead (\r | |
dba03ba1 QH |
346 | IN EFI_FILE_PROTOCOL *FHand,\r |
347 | IN OUT UINTN *BufferSize,\r | |
348 | OUT VOID *Buffer\r | |
b9ec9330 QH |
349 | )\r |
350 | /*++\r | |
351 | \r | |
352 | Routine Description:\r | |
353 | \r | |
354 | Get the file info.\r | |
355 | \r | |
356 | Arguments:\r | |
357 | \r | |
358 | FHand - The handle of the file.\r | |
359 | BufferSize - Size of Buffer.\r | |
360 | Buffer - Buffer containing read data.\r | |
361 | \r | |
362 | Returns:\r | |
363 | \r | |
364 | EFI_SUCCESS - Get the file info successfully.\r | |
365 | EFI_DEVICE_ERROR - Can not find the OFile for the file.\r | |
366 | EFI_VOLUME_CORRUPTED - The file type of open file is error.\r | |
367 | other - An error occurred when operation the disk.\r | |
368 | \r | |
369 | --*/\r | |
370 | {\r | |
371 | return FatIFileAccess (FHand, READ_DATA, BufferSize, Buffer);\r | |
372 | }\r | |
373 | \r | |
374 | EFI_STATUS\r | |
375 | EFIAPI\r | |
376 | FatWrite (\r | |
dba03ba1 QH |
377 | IN EFI_FILE_PROTOCOL *FHand,\r |
378 | IN OUT UINTN *BufferSize,\r | |
379 | IN VOID *Buffer\r | |
b9ec9330 QH |
380 | )\r |
381 | /*++\r | |
382 | \r | |
383 | Routine Description:\r | |
384 | \r | |
385 | Write the content of buffer into files.\r | |
386 | \r | |
387 | Arguments:\r | |
388 | \r | |
389 | FHand - The handle of the file.\r | |
390 | BufferSize - Size of Buffer.\r | |
391 | Buffer - Buffer containing write data.\r | |
392 | \r | |
393 | Returns:\r | |
394 | \r | |
395 | EFI_SUCCESS - Set the file info successfully.\r | |
396 | EFI_WRITE_PROTECTED - The disk is write protect.\r | |
397 | EFI_ACCESS_DENIED - The file is read-only.\r | |
398 | EFI_DEVICE_ERROR - The OFile is not valid.\r | |
399 | EFI_UNSUPPORTED - The open file is not a file.\r | |
400 | - The writing file size is larger than 4GB.\r | |
401 | other - An error occurred when operation the disk.\r | |
402 | \r | |
403 | --*/\r | |
404 | {\r | |
405 | return FatIFileAccess (FHand, WRITE_DATA, BufferSize, Buffer);\r | |
406 | }\r | |
407 | \r | |
408 | EFI_STATUS\r | |
409 | FatAccessOFile (\r | |
410 | IN FAT_OFILE *OFile,\r | |
411 | IN IO_MODE IoMode,\r | |
412 | IN UINTN Position,\r | |
413 | IN OUT UINTN *DataBufferSize,\r | |
414 | IN OUT UINT8 *UserBuffer\r | |
415 | )\r | |
416 | /*++\r | |
417 | \r | |
418 | Routine Description:\r | |
419 | \r | |
420 | This function reads data from a file or writes data to a file.\r | |
421 | It uses OFile->PosRem to determine how much data can be accessed in one time.\r | |
422 | \r | |
423 | Arguments:\r | |
424 | \r | |
425 | OFile - The open file.\r | |
426 | IoMode - Indicate whether the access mode is reading or writing.\r | |
427 | Position - The position where data will be accessed.\r | |
428 | DataBufferSize - Size of Buffer.\r | |
429 | UserBuffer - Buffer containing data.\r | |
430 | \r | |
431 | Returns:\r | |
432 | \r | |
433 | EFI_SUCCESS - Access the data successfully.\r | |
434 | other - An error occurred when operating on the disk.\r | |
435 | \r | |
436 | --*/\r | |
437 | {\r | |
438 | FAT_VOLUME *Volume;\r | |
439 | UINTN Len;\r | |
440 | EFI_STATUS Status;\r | |
441 | UINTN BufferSize;\r | |
442 | \r | |
443 | BufferSize = *DataBufferSize;\r | |
444 | Volume = OFile->Volume;\r | |
445 | ASSERT_VOLUME_LOCKED (Volume);\r | |
446 | \r | |
447 | Status = EFI_SUCCESS;\r | |
448 | while (BufferSize > 0) {\r | |
449 | //\r | |
450 | // Seek the OFile to the file position\r | |
451 | //\r | |
452 | Status = FatOFilePosition (OFile, Position, BufferSize);\r | |
453 | if (EFI_ERROR (Status)) {\r | |
454 | break;\r | |
455 | }\r | |
456 | //\r | |
457 | // Clip length to block run\r | |
458 | //\r | |
459 | Len = BufferSize > OFile->PosRem ? OFile->PosRem : BufferSize;\r | |
460 | \r | |
461 | //\r | |
462 | // Write the data\r | |
463 | //\r | |
464 | Status = FatDiskIo (Volume, IoMode, OFile->PosDisk, Len, UserBuffer);\r | |
465 | if (EFI_ERROR (Status)) {\r | |
466 | break;\r | |
467 | }\r | |
468 | //\r | |
469 | // Data was successfully accessed\r | |
470 | //\r | |
471 | Position += Len;\r | |
472 | UserBuffer += Len;\r | |
473 | BufferSize -= Len;\r | |
474 | if (IoMode == WRITE_DATA) {\r | |
475 | OFile->Dirty = TRUE;\r | |
476 | OFile->Archive = TRUE;\r | |
477 | }\r | |
478 | //\r | |
479 | // Make sure no outbound occurred\r | |
480 | //\r | |
481 | ASSERT (Position <= OFile->FileSize);\r | |
482 | }\r | |
483 | //\r | |
484 | // Update the number of bytes accessed\r | |
485 | //\r | |
486 | *DataBufferSize -= BufferSize;\r | |
487 | return Status;\r | |
488 | }\r | |
489 | \r | |
490 | EFI_STATUS\r | |
491 | FatExpandOFile (\r | |
492 | IN FAT_OFILE *OFile,\r | |
493 | IN UINT64 ExpandedSize\r | |
494 | )\r | |
495 | /*++\r | |
496 | \r | |
497 | Routine Description:\r | |
498 | \r | |
499 | Expand OFile by appending zero bytes at the end of OFile.\r | |
500 | \r | |
501 | Arguments:\r | |
502 | \r | |
503 | OFile - The open file.\r | |
504 | ExpandedSize - The number of zero bytes appended at the end of the file.\r | |
505 | \r | |
506 | Returns:\r | |
507 | \r | |
508 | EFI_SUCCESS - The file is expanded successfully.\r | |
509 | other - An error occurred when expanding file.\r | |
510 | \r | |
511 | --*/\r | |
512 | {\r | |
513 | EFI_STATUS Status;\r | |
514 | UINTN WritePos;\r | |
515 | \r | |
516 | WritePos = OFile->FileSize;\r | |
517 | Status = FatGrowEof (OFile, ExpandedSize);\r | |
518 | if (!EFI_ERROR (Status)) {\r | |
519 | Status = FatWriteZeroPool (OFile, WritePos);\r | |
520 | }\r | |
521 | \r | |
522 | return Status;\r | |
523 | }\r | |
524 | \r | |
525 | EFI_STATUS\r | |
526 | FatWriteZeroPool (\r | |
527 | IN FAT_OFILE *OFile,\r | |
528 | IN UINTN WritePos\r | |
529 | )\r | |
530 | /*++\r | |
531 | \r | |
532 | Routine Description:\r | |
533 | \r | |
534 | Write zero pool from the WritePos to the end of OFile.\r | |
535 | \r | |
536 | Arguments:\r | |
537 | \r | |
538 | OFile - The open file to write zero pool.\r | |
539 | WritePos - The number of zero bytes written.\r | |
540 | \r | |
541 | Returns:\r | |
542 | \r | |
543 | EFI_SUCCESS - Write the zero pool successfully.\r | |
544 | EFI_OUT_OF_RESOURCES - Not enough memory to perform the operation.\r | |
545 | other - An error occurred when writing disk.\r | |
546 | \r | |
547 | --*/\r | |
548 | {\r | |
549 | EFI_STATUS Status;\r | |
550 | VOID *ZeroBuffer;\r | |
551 | UINTN AppendedSize;\r | |
552 | UINTN BufferSize;\r | |
553 | UINTN WriteSize;\r | |
554 | \r | |
555 | AppendedSize = OFile->FileSize - WritePos;\r | |
556 | BufferSize = AppendedSize;\r | |
557 | if (AppendedSize > FAT_MAX_ALLOCATE_SIZE) {\r | |
558 | //\r | |
559 | // If the appended size is larger, maybe we can not allocate the whole\r | |
560 | // memory once. So if the growed size is larger than 10M, we just\r | |
561 | // allocate 10M memory (one healthy system should have 10M available\r | |
562 | // memory), and then write the zerobuffer to the file several times.\r | |
563 | //\r | |
564 | BufferSize = FAT_MAX_ALLOCATE_SIZE;\r | |
565 | }\r | |
566 | \r | |
567 | ZeroBuffer = AllocateZeroPool (BufferSize);\r | |
568 | if (ZeroBuffer == NULL) {\r | |
569 | return EFI_OUT_OF_RESOURCES;\r | |
570 | }\r | |
571 | \r | |
572 | do {\r | |
573 | WriteSize = AppendedSize > BufferSize ? BufferSize : (UINTN) AppendedSize;\r | |
574 | AppendedSize -= WriteSize;\r | |
575 | Status = FatAccessOFile (OFile, WRITE_DATA, WritePos, &WriteSize, ZeroBuffer);\r | |
576 | if (EFI_ERROR (Status)) {\r | |
577 | break;\r | |
578 | }\r | |
579 | \r | |
580 | WritePos += WriteSize;\r | |
581 | } while (AppendedSize > 0);\r | |
582 | \r | |
583 | FreePool (ZeroBuffer);\r | |
584 | return Status;\r | |
585 | }\r | |
586 | \r | |
587 | EFI_STATUS\r | |
588 | FatTruncateOFile (\r | |
589 | IN FAT_OFILE *OFile,\r | |
590 | IN UINTN TruncatedSize\r | |
591 | )\r | |
592 | /*++\r | |
593 | \r | |
594 | Routine Description:\r | |
595 | \r | |
596 | Truncate the OFile to smaller file size.\r | |
597 | \r | |
598 | Arguments:\r | |
599 | \r | |
600 | OFile - The open file.\r | |
601 | TruncatedSize - The new file size.\r | |
602 | \r | |
603 | Returns:\r | |
604 | \r | |
605 | EFI_SUCCESS - The file is truncated successfully.\r | |
606 | other - An error occurred when truncating file.\r | |
607 | \r | |
608 | --*/\r | |
609 | {\r | |
610 | OFile->FileSize = TruncatedSize;\r | |
611 | return FatShrinkEof (OFile);\r | |
612 | }\r |