📄 libdir.lst
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261 2 size = 0;//根目录的size,以sector为单位。
262 2 start = drv->RootStart;
263 2
264 2 //循环整个cluster chain，得到根目录的size
265 2 while(start != 0xffffffff){
266 3 size += drv->ClusterSize;
267 3 // start = drv->FatRead(drv, start);
268 3 start = ReadFatxx(start);
269 3 if(!start)
270 3 {
271 4 //start为0表示该cluster可用，则根目录不存在
272 4 // drv->StatusCode = DRIVE_FORMAT_ERROR;
273 4 return ABNORMAL_STATUS;
274 4 }
275 3 }
276 2
277 2 start = drv->RootStart;
278 2 //每个sector为512bytes，将size从sector单位转为byte单位。
279 2 size = size << drv->bBytesPerSectorExp;//size = size << 9; // byte size
280 2
281 2 // UartOutText("-I-: drv->Flag.Fat32 \r\n");
282 2 }else{
283 2 //size = ( drv->DataStart - drv->RootStart ) << 9; // byte size
284 2 size = ( drv->DataStart - drv->RootStart ) << drv->bBytesPerSectorExp;
285 2 //no no no if start = 0 mean in the root area of FAT12/FAT16
286 2 start = 0;//??????why is not the drv->RootStart
287 2
288 2 // UartOutText("-I-: drv->Flag.Fat16 \r\n");
289 2 }
290 1 //size为根目录区的大小，以byte为单位。
291 1 ChainInit(drv, drv->DirStackBuffer, start, size);
292 1
293 1 #if 0
dir = (CHAIN *) drv->DirStackBuffer;
UartOutText("-I-:dir->Current: ");UartOutValue(dir->Current, 8);
UartOutText("-I-:dir->Start: ");UartOutValue(dir->Start, 8);
UartOutText("-I-:dir->Point: ");UartOutValue(dir->Point, 8);
UartOutText("-I-:dir->Size: ");UartOutValue(dir->Size, 8);
#endif
300 1 if(DirCaching(drv) != FS_SUCCEED) return DRIVE_ACCESS_FAIL;
301 1
C51 COMPILER V8.01 LIBDIR 04/17/2008 09:45:58 PAGE 6
302 1 return FS_SUCCEED;
303 1 }
304
305 ///
306 ///@ingroup DIRECTORY
307 ///@brief Move to first available file or sub-dir in the current directory
308 ///
309 ///@param DRIVE *drv The drive to access
310 ///
311 ///@return END_OF_DIR mean no file or sub-dir in the current directory
312 ///@return ABNORMAL_STATUS move fail
313 ///@return FS_SUCCEED mean move successful
314 ///
315 ///finding the first available file or sub-dir in the current directory of the
316 ///specified drive, the current node point will move to the found node or at
317 ///the end of the directory if file not found
318 BYTE DirFirst(DRIVE *drv)
319 {
320 1 // BYTE result;
321 1 FDB *node;
322 1
323 1 FirstNode(drv);
324 1 node = (FDB *)(drv->Node);
325 1 if(!node->Name[0]) return END_OF_DIR;
326 1
327 1 #if 0
while(ScanFileName(drv) == FILENAME_SCAN_CONTINUE)
{
result = NextNode(drv);
if(result != FS_SUCCEED) return result;
}
#endif
334 1 return FS_SUCCEED;
335 1 }
336
337 BYTE DirLast(DRIVE *drv)
338 {
339 1 if(DirFirst(drv) == END_OF_DIR) return END_OF_DIR;
340 1
341 1 while(NextNode(drv) == FS_SUCCEED);// WDT = 0x1F;
342 1
343 1 #if 0
DirPrevious(drv);
#else
346 1 PreviousNode(drv);
347 1 #endif
348 1 return FS_SUCCEED;
349 1 }
350
351 #if 0
BYTE DirPrevious(DRIVE *drv)
{
register BYTE first, attr;
BYTE flag;
do
{
// if no next node can read then return fail
if(PreviousNode(drv) != FS_SUCCEED)
return BEGIN_OF_DIR;
first = drv->Node->Name[0];
C51 COMPILER V8.01 LIBDIR 04/17/2008 09:45:58 PAGE 7
attr = drv->Node->Attribute;
// check if the node is a valid file or sub-dir
}while(first == 0xe5 || first == 0x2e || (attr&FDB_LABEL) || attr == 0x0f);
if(PreviousNode(drv) == BEGIN_OF_DIR)
DirFirst(drv);
else
{
flag = FS_SUCCEED;
while(drv->Node->Attribute == 0x0f && flag == FS_SUCCEED)
flag = PreviousNode(drv);
if(flag == FS_SUCCEED)
DirNext(drv);
else
DirFirst(drv);
}
return FS_SUCCEED;
}
///
///@ingroup DIRECTORY
///@brief Move to next available file or sub-dir in the current directory
///
///@param DRIVE *drv The drive to access
///
///@return END_OF_DIR mean no more file or sub-dir in the current directory
///@return ABNORMAL_STATUS move fail
///@return FS_SUCCEED mean move successful
///
///finding next available file or sub-dir in the current directory of the
///specified drive, the current node point will move to the found node or at
///the end of the directory if file not found
BYTE DirNext(DRIVE *drv)
{
BYTE result;
do{
result = NextNode(drv);
if(result != FS_SUCCEED) return result;
}while(ScanFileName(drv) == FILENAME_SCAN_CONTINUE);
return FS_SUCCEED;
}
#endif
412
413 /////////////////////////////////////////////////////////////////////////////
414 // Follows function calls are for directory access //
415 /////////////////////////////////////////////////////////////////////////////
416 ///
417 ///@ingroup DIRECTORY
418 ///@brief Enter subdirectory
419 ///
420 ///@param DRIVE *drv The drive to access
421 ///
422 ///@return ABNORMAL_STATUS can open the subdirectory
423 ///@return FS_SUCCEED enter the subdirectory sucess
424 ///
425 BYTE CdSub(DRIVE *drv)
C51 COMPILER V8.01 LIBDIR 04/17/2008 09:45:58 PAGE 8
426 {
427 1 CHAIN *dir;
428 1 FDB *node;
429 1 DWORD start, cluster, size;
430 1 // WORD *string;
431 1
432 1 node = drv->Node;
433 1
434 1 if(!(node->Attribute&FDB_SUB_DIR)) return ABNORMAL_STATUS;
435 1 //Here we should check the depth of subdir
436 1 //if(drv->DirStackPoint == (DIR_STACK_DEEP-1)*sizeof(CHAIN)){
437 1 if(drv->DirStackPoint == (DIR_STACK_DEEP-1)<<CHAIN_SIZEEXP){
438 2 UartOutText("-W-: DIR_STACK_DEEP \r\n");
439 2 //return FS_SUCCEED;//ABNORMAL_STATUS;
440 2 return ABNORMAL_STATUS;
441 2 }
442 1 /*
443 1 string = drv->Path;
444 1 while(*string) string ++; // search to the end of the string
445 1 string = StringCopy16(string, drv->Name); // append current node name
446 1 *string = 0x5c; // append '\'
447 1 string ++;
448 1 *string = 0;
449 1 */
450 1 drv->DirStackPoint += sizeof(CHAIN);
451 1 dir = (CHAIN *)((BYTE *)drv->DirStackBuffer + drv->DirStackPoint);
452 1
453 1 //start = (LoadAlien16(&node->StartHigh) << 16) + LoadAlien16(&node->StartLow);
454 1 #if 0
start = LoadAlien16(&node->StartHigh);
start <<= 16;
start += LoadAlien16(&node->StartLow);
#else
459 1 *((WORD *)(&start)) = LoadAlien16(&node->StartHigh);
460 1 *((WORD *)(&start) + 1) = LoadAlien16(&node->StartLow);
461 1 #endif
462 1 size = 0;
463 1 cluster = start;
464 1 while(cluster != 0xffffffff){
465 2 size += drv->ClusterSize;
466 2 //cluster = drv->FatRead(drv, cluster);
467 2 cluster = ReadFatxx(cluster);
468 2 }
469 1 size = size << drv->bBytesPerSectorExp;//size = size << 9;
470 1
471 1 ChainInit(drv, dir, start, size);
472 1 // UartOutText("-I-: dir start:"); UartOutValue(start, 8);
473 1 // UartOutText("-I-: dir size:"); UartOutValue(size, 8);
474 1 if(DirCaching(drv) != FS_SUCCEED) return ABNORMAL_STATUS;
475 1
476 1 return FS_SUCCEED;
477 1 }
478
479
480 ///
481 ///@ingroup DIRECTORY
482 ///@brief exit the subdirectory
483 ///
484 ///@param DRIVE *drv The drive to access
485 ///
486 ///@return ABNORMAL_STATUS exit fail
487 ///@return FS_SUCCEED open the subdirectory sucess
C51 COMPILER V8.01 LIBDIR 04/17/2008 09:45:58 PAGE 9
488 ///
489 BYTE CdParent(DRIVE *drv)
490 {
491 1 // WORD *string;
492 1
493 1 if(!drv->DirStackPoint) return FS_SUCCEED; // at root dir
494 1
495 1 drv->DirStackPoint -= sizeof(CHAIN);
496 1 /*
497 1 // recover the path to upper layer directory
498 1 string = drv->Path;
499 1 while(*string) string ++; // search to the end of the string
500 1 string -= 2;
501 1 while(*string != 0x5c) string--; // search the '\'
502 1 string ++;
503 1 *string = 0;
504 1 */
505 1 if(DirCaching(drv) != FS_SUCCEED) return ABNORMAL_STATUS;
506 1
507 1 return FS_SUCCEED;
508 1 }
509
510 #if 0
BYTE GetLongNameFdbCount()
{
return LongNameFdbCount;
}
#endif
516
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 1272 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- 67
PDATA SIZE = ---- ----
DATA SIZE = ---- ----
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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