3 * Copyright (C) 1998-2002 Brian Palmer <brianp@sginet.com>
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 2 of the License, or
8 * (at your option) any later version.
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 PFAT_BOOTSECTOR FatVolumeBootSector
= NULL
;
33 PFAT32_BOOTSECTOR Fat32VolumeBootSector
= NULL
;
35 ULONG RootDirSectorStart
; // Starting sector of the root directory (fat12/16)
36 ULONG DataSectorStart
; // Starting sector of the data area
37 ULONG SectorsPerFat
; // Sectors per FAT table
38 ULONG RootDirSectors
; // Number of sectors of the root directory (fat32)
40 ULONG FatType
= 0; // FAT12, FAT16, or FAT32
41 ULONG FatDriveNumber
= 0;
43 BOOL
FatOpenVolume(ULONG DriveNumber
, ULONG VolumeStartSector
)
46 DbgPrint((DPRINT_FILESYSTEM
, "FatOpenVolume() DriveNumber = 0x%x VolumeStartSector = %d\n", DriveNumber
, VolumeStartSector
));
48 // Store the drive number
49 FatDriveNumber
= DriveNumber
;
52 // Free any memory previously allocated
54 if (FatVolumeBootSector
!= NULL
)
56 FreeMemory(FatVolumeBootSector
);
58 FatVolumeBootSector
= NULL
;
59 Fat32VolumeBootSector
= NULL
;
63 // Now allocate the memory to hold the boot sector
65 FatVolumeBootSector
= (PFAT_BOOTSECTOR
) AllocateMemory(512);
66 Fat32VolumeBootSector
= (PFAT32_BOOTSECTOR
) FatVolumeBootSector
;
69 // Make sure we got the memory
71 if (FatVolumeBootSector
== NULL
)
73 FileSystemError("Out of memory.");
77 // Now try to read the boot sector
78 // If this fails then abort
79 if (!DiskReadLogicalSectors(DriveNumber
, VolumeStartSector
, 1, FatVolumeBootSector
))
85 FatType
= FatDetermineFatType(FatVolumeBootSector
);
89 DbgPrint((DPRINT_FILESYSTEM
, "Dumping boot sector:\n"));
93 DbgPrint((DPRINT_FILESYSTEM
, "sizeof(FAT32_BOOTSECTOR) = 0x%x.\n", sizeof(FAT32_BOOTSECTOR
)));
95 DbgPrint((DPRINT_FILESYSTEM
, "JumpBoot: 0x%x 0x%x 0x%x\n", Fat32VolumeBootSector
->JumpBoot
[0], Fat32VolumeBootSector
->JumpBoot
[1], Fat32VolumeBootSector
->JumpBoot
[2]));
96 DbgPrint((DPRINT_FILESYSTEM
, "OemName: %c%c%c%c%c%c%c%c\n", Fat32VolumeBootSector
->OemName
[0], Fat32VolumeBootSector
->OemName
[1], Fat32VolumeBootSector
->OemName
[2], Fat32VolumeBootSector
->OemName
[3], Fat32VolumeBootSector
->OemName
[4], Fat32VolumeBootSector
->OemName
[5], Fat32VolumeBootSector
->OemName
[6], Fat32VolumeBootSector
->OemName
[7]));
97 DbgPrint((DPRINT_FILESYSTEM
, "BytesPerSector: %d\n", Fat32VolumeBootSector
->BytesPerSector
));
98 DbgPrint((DPRINT_FILESYSTEM
, "SectorsPerCluster: %d\n", Fat32VolumeBootSector
->SectorsPerCluster
));
99 DbgPrint((DPRINT_FILESYSTEM
, "ReservedSectors: %d\n", Fat32VolumeBootSector
->ReservedSectors
));
100 DbgPrint((DPRINT_FILESYSTEM
, "NumberOfFats: %d\n", Fat32VolumeBootSector
->NumberOfFats
));
101 DbgPrint((DPRINT_FILESYSTEM
, "RootDirEntries: %d\n", Fat32VolumeBootSector
->RootDirEntries
));
102 DbgPrint((DPRINT_FILESYSTEM
, "TotalSectors: %d\n", Fat32VolumeBootSector
->TotalSectors
));
103 DbgPrint((DPRINT_FILESYSTEM
, "MediaDescriptor: 0x%x\n", Fat32VolumeBootSector
->MediaDescriptor
));
104 DbgPrint((DPRINT_FILESYSTEM
, "SectorsPerFat: %d\n", Fat32VolumeBootSector
->SectorsPerFat
));
105 DbgPrint((DPRINT_FILESYSTEM
, "SectorsPerTrack: %d\n", Fat32VolumeBootSector
->SectorsPerTrack
));
106 DbgPrint((DPRINT_FILESYSTEM
, "NumberOfHeads: %d\n", Fat32VolumeBootSector
->NumberOfHeads
));
107 DbgPrint((DPRINT_FILESYSTEM
, "HiddenSectors: %d\n", Fat32VolumeBootSector
->HiddenSectors
));
108 DbgPrint((DPRINT_FILESYSTEM
, "TotalSectorsBig: %d\n", Fat32VolumeBootSector
->TotalSectorsBig
));
109 DbgPrint((DPRINT_FILESYSTEM
, "SectorsPerFatBig: %d\n", Fat32VolumeBootSector
->SectorsPerFatBig
));
110 DbgPrint((DPRINT_FILESYSTEM
, "ExtendedFlags: 0x%x\n", Fat32VolumeBootSector
->ExtendedFlags
));
111 DbgPrint((DPRINT_FILESYSTEM
, "FileSystemVersion: 0x%x\n", Fat32VolumeBootSector
->FileSystemVersion
));
112 DbgPrint((DPRINT_FILESYSTEM
, "RootDirStartCluster: %d\n", Fat32VolumeBootSector
->RootDirStartCluster
));
113 DbgPrint((DPRINT_FILESYSTEM
, "FsInfo: %d\n", Fat32VolumeBootSector
->FsInfo
));
114 DbgPrint((DPRINT_FILESYSTEM
, "BackupBootSector: %d\n", Fat32VolumeBootSector
->BackupBootSector
));
115 DbgPrint((DPRINT_FILESYSTEM
, "Reserved: 0x%x\n", Fat32VolumeBootSector
->Reserved
));
116 DbgPrint((DPRINT_FILESYSTEM
, "DriveNumber: 0x%x\n", Fat32VolumeBootSector
->DriveNumber
));
117 DbgPrint((DPRINT_FILESYSTEM
, "Reserved1: 0x%x\n", Fat32VolumeBootSector
->Reserved1
));
118 DbgPrint((DPRINT_FILESYSTEM
, "BootSignature: 0x%x\n", Fat32VolumeBootSector
->BootSignature
));
119 DbgPrint((DPRINT_FILESYSTEM
, "VolumeSerialNumber: 0x%x\n", Fat32VolumeBootSector
->VolumeSerialNumber
));
120 DbgPrint((DPRINT_FILESYSTEM
, "VolumeLabel: %c%c%c%c%c%c%c%c%c%c%c\n", Fat32VolumeBootSector
->VolumeLabel
[0], Fat32VolumeBootSector
->VolumeLabel
[1], Fat32VolumeBootSector
->VolumeLabel
[2], Fat32VolumeBootSector
->VolumeLabel
[3], Fat32VolumeBootSector
->VolumeLabel
[4], Fat32VolumeBootSector
->VolumeLabel
[5], Fat32VolumeBootSector
->VolumeLabel
[6], Fat32VolumeBootSector
->VolumeLabel
[7], Fat32VolumeBootSector
->VolumeLabel
[8], Fat32VolumeBootSector
->VolumeLabel
[9], Fat32VolumeBootSector
->VolumeLabel
[10]));
121 DbgPrint((DPRINT_FILESYSTEM
, "FileSystemType: %c%c%c%c%c%c%c%c\n", Fat32VolumeBootSector
->FileSystemType
[0], Fat32VolumeBootSector
->FileSystemType
[1], Fat32VolumeBootSector
->FileSystemType
[2], Fat32VolumeBootSector
->FileSystemType
[3], Fat32VolumeBootSector
->FileSystemType
[4], Fat32VolumeBootSector
->FileSystemType
[5], Fat32VolumeBootSector
->FileSystemType
[6], Fat32VolumeBootSector
->FileSystemType
[7]));
122 DbgPrint((DPRINT_FILESYSTEM
, "BootSectorMagic: 0x%x\n", Fat32VolumeBootSector
->BootSectorMagic
));
126 DbgPrint((DPRINT_FILESYSTEM
, "sizeof(FAT_BOOTSECTOR) = 0x%x.\n", sizeof(FAT_BOOTSECTOR
)));
128 DbgPrint((DPRINT_FILESYSTEM
, "JumpBoot: 0x%x 0x%x 0x%x\n", FatVolumeBootSector
->JumpBoot
[0], FatVolumeBootSector
->JumpBoot
[1], FatVolumeBootSector
->JumpBoot
[2]));
129 DbgPrint((DPRINT_FILESYSTEM
, "OemName: %c%c%c%c%c%c%c%c\n", FatVolumeBootSector
->OemName
[0], FatVolumeBootSector
->OemName
[1], FatVolumeBootSector
->OemName
[2], FatVolumeBootSector
->OemName
[3], FatVolumeBootSector
->OemName
[4], FatVolumeBootSector
->OemName
[5], FatVolumeBootSector
->OemName
[6], FatVolumeBootSector
->OemName
[7]));
130 DbgPrint((DPRINT_FILESYSTEM
, "BytesPerSector: %d\n", FatVolumeBootSector
->BytesPerSector
));
131 DbgPrint((DPRINT_FILESYSTEM
, "SectorsPerCluster: %d\n", FatVolumeBootSector
->SectorsPerCluster
));
132 DbgPrint((DPRINT_FILESYSTEM
, "ReservedSectors: %d\n", FatVolumeBootSector
->ReservedSectors
));
133 DbgPrint((DPRINT_FILESYSTEM
, "NumberOfFats: %d\n", FatVolumeBootSector
->NumberOfFats
));
134 DbgPrint((DPRINT_FILESYSTEM
, "RootDirEntries: %d\n", FatVolumeBootSector
->RootDirEntries
));
135 DbgPrint((DPRINT_FILESYSTEM
, "TotalSectors: %d\n", FatVolumeBootSector
->TotalSectors
));
136 DbgPrint((DPRINT_FILESYSTEM
, "MediaDescriptor: 0x%x\n", FatVolumeBootSector
->MediaDescriptor
));
137 DbgPrint((DPRINT_FILESYSTEM
, "SectorsPerFat: %d\n", FatVolumeBootSector
->SectorsPerFat
));
138 DbgPrint((DPRINT_FILESYSTEM
, "SectorsPerTrack: %d\n", FatVolumeBootSector
->SectorsPerTrack
));
139 DbgPrint((DPRINT_FILESYSTEM
, "NumberOfHeads: %d\n", FatVolumeBootSector
->NumberOfHeads
));
140 DbgPrint((DPRINT_FILESYSTEM
, "HiddenSectors: %d\n", FatVolumeBootSector
->HiddenSectors
));
141 DbgPrint((DPRINT_FILESYSTEM
, "TotalSectorsBig: %d\n", FatVolumeBootSector
->TotalSectorsBig
));
142 DbgPrint((DPRINT_FILESYSTEM
, "DriveNumber: 0x%x\n", FatVolumeBootSector
->DriveNumber
));
143 DbgPrint((DPRINT_FILESYSTEM
, "Reserved1: 0x%x\n", FatVolumeBootSector
->Reserved1
));
144 DbgPrint((DPRINT_FILESYSTEM
, "BootSignature: 0x%x\n", FatVolumeBootSector
->BootSignature
));
145 DbgPrint((DPRINT_FILESYSTEM
, "VolumeSerialNumber: 0x%x\n", FatVolumeBootSector
->VolumeSerialNumber
));
146 DbgPrint((DPRINT_FILESYSTEM
, "VolumeLabel: %c%c%c%c%c%c%c%c%c%c%c\n", FatVolumeBootSector
->VolumeLabel
[0], FatVolumeBootSector
->VolumeLabel
[1], FatVolumeBootSector
->VolumeLabel
[2], FatVolumeBootSector
->VolumeLabel
[3], FatVolumeBootSector
->VolumeLabel
[4], FatVolumeBootSector
->VolumeLabel
[5], FatVolumeBootSector
->VolumeLabel
[6], FatVolumeBootSector
->VolumeLabel
[7], FatVolumeBootSector
->VolumeLabel
[8], FatVolumeBootSector
->VolumeLabel
[9], FatVolumeBootSector
->VolumeLabel
[10]));
147 DbgPrint((DPRINT_FILESYSTEM
, "FileSystemType: %c%c%c%c%c%c%c%c\n", FatVolumeBootSector
->FileSystemType
[0], FatVolumeBootSector
->FileSystemType
[1], FatVolumeBootSector
->FileSystemType
[2], FatVolumeBootSector
->FileSystemType
[3], FatVolumeBootSector
->FileSystemType
[4], FatVolumeBootSector
->FileSystemType
[5], FatVolumeBootSector
->FileSystemType
[6], FatVolumeBootSector
->FileSystemType
[7]));
148 DbgPrint((DPRINT_FILESYSTEM
, "BootSectorMagic: 0x%x\n", FatVolumeBootSector
->BootSectorMagic
));
151 #endif // defined DEBUG
154 // Check the boot sector magic
156 if (FatVolumeBootSector
->BootSectorMagic
!= 0xaa55)
158 FileSystemError("Invalid boot sector magic (0xaa55)");
163 // Check the FAT cluster size
164 // We do not support clusters bigger than 64k
166 if ((FatVolumeBootSector
->SectorsPerCluster
* FatVolumeBootSector
->BytesPerSector
) > (64 * 1024))
168 FileSystemError("This file system has cluster sizes bigger than 64k.\nFreeLoader does not support this.");
173 // Clear our variables
175 RootDirSectorStart
= 0;
181 // Get the sectors per FAT,
182 // root directory starting sector,
183 // and data sector start
185 if (FatType
!= FAT32
)
187 SectorsPerFat
= FatVolumeBootSector
->SectorsPerFat
;
189 RootDirSectorStart
= (FatVolumeBootSector
->NumberOfFats
* SectorsPerFat
) + FatVolumeBootSector
->ReservedSectors
;
190 RootDirSectors
= ((FatVolumeBootSector
->RootDirEntries
* 32) + (FatVolumeBootSector
->BytesPerSector
- 1)) / FatVolumeBootSector
->BytesPerSector
;
192 DataSectorStart
= FatVolumeBootSector
->ReservedSectors
+ (FatVolumeBootSector
->NumberOfFats
* FatVolumeBootSector
->SectorsPerFat
) + RootDirSectors
;
196 SectorsPerFat
= Fat32VolumeBootSector
->SectorsPerFatBig
;
198 DataSectorStart
= FatVolumeBootSector
->ReservedSectors
+ (FatVolumeBootSector
->NumberOfFats
* Fat32VolumeBootSector
->SectorsPerFatBig
) + RootDirSectors
;
203 // we only work with version 0
205 if (Fat32VolumeBootSector
->FileSystemVersion
!= 0)
207 FileSystemError("FreeLoader is too old to work with this FAT32 filesystem.\nPlease update FreeLoader.");
213 // Initialize the disk cache for this drive
215 if (!CacheInitializeDrive(DriveNumber
))
221 // Force the FAT sectors into the cache
222 // as long as it is FAT12 or FAT16. FAT32 can
223 // have a multi-megabyte FAT so we don't want that.
225 if (FatType
!= FAT32
)
227 if (!CacheForceDiskSectorsIntoCache(DriveNumber
, FatVolumeBootSector
->HiddenSectors
+ FatVolumeBootSector
->ReservedSectors
, FatVolumeBootSector
->SectorsPerFat
))
236 ULONG
FatDetermineFatType(PFAT_BOOTSECTOR FatBootSector
)
238 ULONG RootDirSectors
;
239 ULONG DataSectorCount
;
242 ULONG CountOfClusters
;
243 PFAT32_BOOTSECTOR Fat32BootSector
= (PFAT32_BOOTSECTOR
)FatBootSector
;
245 RootDirSectors
= ((FatBootSector
->RootDirEntries
* 32) + (FatBootSector
->BytesPerSector
- 1)) / FatBootSector
->BytesPerSector
;
246 SectorsPerFat
= FatBootSector
->SectorsPerFat
? FatBootSector
->SectorsPerFat
: Fat32BootSector
->SectorsPerFatBig
;
247 TotalSectors
= FatBootSector
->TotalSectors
? FatBootSector
->TotalSectors
: FatBootSector
->TotalSectorsBig
;
248 DataSectorCount
= TotalSectors
- (FatBootSector
->ReservedSectors
+ (FatBootSector
->NumberOfFats
* SectorsPerFat
) + RootDirSectors
);
251 if (FatBootSector
->SectorsPerCluster
== 0)
254 CountOfClusters
= DataSectorCount
/ FatBootSector
->SectorsPerCluster
;
256 if (CountOfClusters
< 4085)
258 /* Volume is FAT12 */
261 else if (CountOfClusters
< 65525)
263 /* Volume is FAT16 */
268 /* Volume is FAT32 */
273 PVOID
FatBufferDirectory(UINT32 DirectoryStartCluster
, PUINT32 EntryCountPointer
, BOOL RootDirectory
)
275 UINT32 RootDirectoryStartSector
;
276 UINT32 RootDirectorySectorCount
;
277 PVOID DirectoryBuffer
;
278 UINT32 DirectorySize
;
280 DbgPrint((DPRINT_FILESYSTEM
, "FatBufferDirectory() DirectoryStartCluster = %d RootDirectory = %s\n", DirectoryStartCluster
, (RootDirectory
? "TRUE" : "FALSE")));
283 // Calculate the size of the directory
285 if ((RootDirectory
) && (FatType
!= FAT32
))
287 DirectorySize
= ROUND_UP((FatVolumeBootSector
->RootDirEntries
* 32), FatVolumeBootSector
->BytesPerSector
);
293 DirectorySize
= (FatCountClustersInChain(Fat32VolumeBootSector
->RootDirStartCluster
) * Fat32VolumeBootSector
->SectorsPerCluster
) * Fat32VolumeBootSector
->BytesPerSector
;
297 DirectorySize
= (FatCountClustersInChain(DirectoryStartCluster
) * FatVolumeBootSector
->SectorsPerCluster
) * FatVolumeBootSector
->BytesPerSector
;
302 // Attempt to allocate memory for directory buffer
304 DbgPrint((DPRINT_FILESYSTEM
, "Trying to allocate (DirectorySize) %d bytes.\n", DirectorySize
));
305 DirectoryBuffer
= AllocateMemory(DirectorySize
);
307 if (DirectoryBuffer
== NULL
)
313 // Now read directory contents into DirectoryBuffer
317 if (FatType
== FAT32
)
319 if (!FatReadClusterChain(Fat32VolumeBootSector
->RootDirStartCluster
, 0xFFFFFFFF, DirectoryBuffer
))
321 FreeMemory(DirectoryBuffer
);
328 // FAT type is not FAT32 so the root directory comes right after the fat table
330 RootDirectoryStartSector
= FatVolumeBootSector
->ReservedSectors
+ (FatVolumeBootSector
->NumberOfFats
* FatVolumeBootSector
->SectorsPerFat
);
331 RootDirectorySectorCount
= (DirectorySize
/ FatVolumeBootSector
->BytesPerSector
);
333 if (!FatReadVolumeSectors(FatDriveNumber
, RootDirectoryStartSector
, RootDirectorySectorCount
, DirectoryBuffer
))
335 FreeMemory(DirectoryBuffer
);
342 if (!FatReadClusterChain(DirectoryStartCluster
, 0xFFFFFFFF, DirectoryBuffer
))
344 FreeMemory(DirectoryBuffer
);
349 *EntryCountPointer
= (DirectorySize
/ 32);
351 return DirectoryBuffer
;
354 BOOL
FatSearchDirectoryBufferForFile(PVOID DirectoryBuffer
, UINT32 EntryCount
, PUCHAR FileName
, PFAT_FILE_INFO FatFileInfoPointer
)
358 PLFN_DIRENTRY LfnDirEntry
;
359 UCHAR LfnNameBuffer
[261];
360 UCHAR ShortNameBuffer
[13];
363 DbgPrint((DPRINT_FILESYSTEM
, "FatSearchDirectoryBufferForFile() DirectoryBuffer = 0x%x EntryCount = %d FileName = %s\n", DirectoryBuffer
, EntryCount
, FileName
));
365 memset(ShortNameBuffer
, 0, 13 * sizeof(UCHAR
));
366 memset(LfnNameBuffer
, 0, 261 * sizeof(UCHAR
));
368 for (CurrentEntry
=0; CurrentEntry
<EntryCount
; CurrentEntry
++)
370 DirEntry
= (PDIRENTRY
)(DirectoryBuffer
+ (CurrentEntry
* 32) );
371 LfnDirEntry
= (PLFN_DIRENTRY
)DirEntry
;
374 // Check if this is the last file in the directory
375 // If DirEntry[0] == 0x00 then that means all the
376 // entries after this one are unused. If this is the
377 // last entry then we didn't find the file in this directory.
379 if (DirEntry
->FileName
[0] == 0x00)
385 // Check if this is a deleted entry or not
387 if (DirEntry
->FileName
[0] == 0xE5)
389 memset(ShortNameBuffer
, 0, 13 * sizeof(UCHAR
));
390 memset(LfnNameBuffer
, 0, 261 * sizeof(UCHAR
));
395 // Check if this is a LFN entry
396 // If so it needs special handling
398 if (DirEntry
->Attr
== ATTR_LONG_NAME
)
401 // Check to see if this is a deleted LFN entry, if so continue
403 if (LfnDirEntry
->SequenceNumber
& 0x80)
409 // Mask off high two bits of sequence number
410 // and make the sequence number zero-based
412 LfnDirEntry
->SequenceNumber
&= 0x3F;
413 LfnDirEntry
->SequenceNumber
--;
416 // Get all 13 LFN entry characters
418 if (LfnDirEntry
->Name0_4
[0] != 0xFFFF)
420 LfnNameBuffer
[0 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name0_4
[0];
422 if (LfnDirEntry
->Name0_4
[1] != 0xFFFF)
424 LfnNameBuffer
[1 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name0_4
[1];
426 if (LfnDirEntry
->Name0_4
[2] != 0xFFFF)
428 LfnNameBuffer
[2 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name0_4
[2];
430 if (LfnDirEntry
->Name0_4
[3] != 0xFFFF)
432 LfnNameBuffer
[3 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name0_4
[3];
434 if (LfnDirEntry
->Name0_4
[4] != 0xFFFF)
436 LfnNameBuffer
[4 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name0_4
[4];
438 if (LfnDirEntry
->Name5_10
[0] != 0xFFFF)
440 LfnNameBuffer
[5 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name5_10
[0];
442 if (LfnDirEntry
->Name5_10
[1] != 0xFFFF)
444 LfnNameBuffer
[6 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name5_10
[1];
446 if (LfnDirEntry
->Name5_10
[2] != 0xFFFF)
448 LfnNameBuffer
[7 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name5_10
[2];
450 if (LfnDirEntry
->Name5_10
[3] != 0xFFFF)
452 LfnNameBuffer
[8 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name5_10
[3];
454 if (LfnDirEntry
->Name5_10
[4] != 0xFFFF)
456 LfnNameBuffer
[9 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name5_10
[4];
458 if (LfnDirEntry
->Name5_10
[5] != 0xFFFF)
460 LfnNameBuffer
[10 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name5_10
[5];
462 if (LfnDirEntry
->Name11_12
[0] != 0xFFFF)
464 LfnNameBuffer
[11 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name11_12
[0];
466 if (LfnDirEntry
->Name11_12
[1] != 0xFFFF)
468 LfnNameBuffer
[12 + (LfnDirEntry
->SequenceNumber
* 13)] = (UCHAR
)LfnDirEntry
->Name11_12
[1];
475 // Check for the volume label attribute
476 // and skip over this entry if found
478 if (DirEntry
->Attr
& ATTR_VOLUMENAME
)
480 memset(ShortNameBuffer
, 0, 13 * sizeof(UCHAR
));
481 memset(LfnNameBuffer
, 0, 261 * sizeof(UCHAR
));
486 // If we get here then we've found a short file name
487 // entry and LfnNameBuffer contains the long file
488 // name or zeroes. All we have to do now is see if the
489 // file name matches either the short or long file name
490 // and fill in the FAT_FILE_INFO structure if it does
491 // or zero our buffers and continue looking.
495 // Get short file name
497 FatParseShortFileName(ShortNameBuffer
, DirEntry
);
499 DbgPrint((DPRINT_FILESYSTEM
, "Entry: %d LFN = %s\n", CurrentEntry
, LfnNameBuffer
));
500 DbgPrint((DPRINT_FILESYSTEM
, "Entry: %d DOS name = %s\n", CurrentEntry
, ShortNameBuffer
));
503 // See if the file name matches either the short or long name
505 if (((strlen(FileName
) == strlen(LfnNameBuffer
)) && (stricmp(FileName
, LfnNameBuffer
) == 0)) ||
506 ((strlen(FileName
) == strlen(ShortNameBuffer
)) && (stricmp(FileName
, ShortNameBuffer
) == 0)))
509 // We found the entry, now fill in the FAT_FILE_INFO struct
511 FatFileInfoPointer
->FileSize
= DirEntry
->Size
;
512 FatFileInfoPointer
->FilePointer
= 0;
514 DbgPrint((DPRINT_FILESYSTEM
, "MSDOS Directory Entry:\n"));
515 DbgPrint((DPRINT_FILESYSTEM
, "FileName[11] = %c%c%c%c%c%c%c%c%c%c%c\n", DirEntry
->FileName
[0], DirEntry
->FileName
[1], DirEntry
->FileName
[2], DirEntry
->FileName
[3], DirEntry
->FileName
[4], DirEntry
->FileName
[5], DirEntry
->FileName
[6], DirEntry
->FileName
[7], DirEntry
->FileName
[8], DirEntry
->FileName
[9], DirEntry
->FileName
[10]));
516 DbgPrint((DPRINT_FILESYSTEM
, "Attr = 0x%x\n", DirEntry
->Attr
));
517 DbgPrint((DPRINT_FILESYSTEM
, "ReservedNT = 0x%x\n", DirEntry
->ReservedNT
));
518 DbgPrint((DPRINT_FILESYSTEM
, "TimeInTenths = %d\n", DirEntry
->TimeInTenths
));
519 DbgPrint((DPRINT_FILESYSTEM
, "CreateTime = %d\n", DirEntry
->CreateTime
));
520 DbgPrint((DPRINT_FILESYSTEM
, "CreateDate = %d\n", DirEntry
->CreateDate
));
521 DbgPrint((DPRINT_FILESYSTEM
, "LastAccessDate = %d\n", DirEntry
->LastAccessDate
));
522 DbgPrint((DPRINT_FILESYSTEM
, "ClusterHigh = 0x%x\n", DirEntry
->ClusterHigh
));
523 DbgPrint((DPRINT_FILESYSTEM
, "Time = %d\n", DirEntry
->Time
));
524 DbgPrint((DPRINT_FILESYSTEM
, "Date = %d\n", DirEntry
->Date
));
525 DbgPrint((DPRINT_FILESYSTEM
, "ClusterLow = 0x%x\n", DirEntry
->ClusterLow
));
526 DbgPrint((DPRINT_FILESYSTEM
, "Size = %d\n", DirEntry
->Size
));
529 // Get the cluster chain
531 StartCluster
= ((UINT32
)DirEntry
->ClusterHigh
<< 16) + DirEntry
->ClusterLow
;
532 DbgPrint((DPRINT_FILESYSTEM
, "StartCluster = 0x%x\n", StartCluster
));
533 FatFileInfoPointer
->FileFatChain
= FatGetClusterChainArray(StartCluster
);
536 // See if memory allocation failed
538 if (FatFileInfoPointer
->FileFatChain
== NULL
)
547 // Nope, no match - zero buffers and continue looking
549 memset(ShortNameBuffer
, 0, 13 * sizeof(UCHAR
));
550 memset(LfnNameBuffer
, 0, 261 * sizeof(UCHAR
));
559 * This function searches the file system for the
560 * specified filename and fills in a FAT_STRUCT structure
561 * with info describing the file, etc. returns true
562 * if the file exists or false otherwise
564 BOOL
FatLookupFile(PUCHAR FileName
, PFAT_FILE_INFO FatFileInfoPointer
)
567 ULONG NumberOfPathParts
;
569 PVOID DirectoryBuffer
;
570 UINT32 DirectoryStartCluster
= 0;
571 ULONG DirectoryEntryCount
;
572 FAT_FILE_INFO FatFileInfo
;
574 DbgPrint((DPRINT_FILESYSTEM
, "FatLookupFile() FileName = %s\n", FileName
));
576 memset(FatFileInfoPointer
, 0, sizeof(FAT_FILE_INFO
));
579 // Check and see if the first character is '\' and remove it if so
581 while (*FileName
== '\\')
587 // Figure out how many sub-directories we are nested in
589 NumberOfPathParts
= FatGetNumPathParts(FileName
);
592 // Loop once for each part
594 for (i
=0; i
<NumberOfPathParts
; i
++)
597 // Get first path part
599 FatGetFirstNameFromPath(PathPart
, FileName
);
602 // Advance to the next part of the path
604 for (; (*FileName
!= '\\') && (*FileName
!= '\0'); FileName
++)
610 // Buffer the directory contents
612 DirectoryBuffer
= FatBufferDirectory(DirectoryStartCluster
, &DirectoryEntryCount
, (i
== 0) );
613 if (DirectoryBuffer
== NULL
)
619 // Search for file name in directory
621 if (!FatSearchDirectoryBufferForFile(DirectoryBuffer
, DirectoryEntryCount
, PathPart
, &FatFileInfo
))
623 FreeMemory(DirectoryBuffer
);
627 FreeMemory(DirectoryBuffer
);
630 // If we have another sub-directory to go then
631 // grab the start cluster and free the fat chain array
633 if ((i
+1) < NumberOfPathParts
)
635 DirectoryStartCluster
= FatFileInfo
.FileFatChain
[0];
636 FreeMemory(FatFileInfo
.FileFatChain
);
640 memcpy(FatFileInfoPointer
, &FatFileInfo
, sizeof(FAT_FILE_INFO
));
646 * FatGetNumPathParts()
647 * This function parses a path in the form of dir1\dir2\file1.ext
648 * and returns the number of parts it has (i.e. 3 - dir1,dir2,file1.ext)
650 ULONG
FatGetNumPathParts(PUCHAR Path
)
655 for (i
=0,num
=0; i
<(int)strlen(Path
); i
++)
664 DbgPrint((DPRINT_FILESYSTEM
, "FatGetNumPathParts() Path = %s NumPathParts = %d\n", Path
, num
));
670 * FatGetFirstNameFromPath()
671 * This function parses a path in the form of dir1\dir2\file1.ext
672 * and puts the first name of the path (e.g. "dir1") in buffer
673 * compatible with the MSDOS directory structure
675 VOID
FatGetFirstNameFromPath(PUCHAR Buffer
, PUCHAR Path
)
679 // Copy all the characters up to the end of the
680 // string or until we hit a '\' character
681 // and put them in Buffer
682 for (i
=0; i
<(int)strlen(Path
); i
++)
696 DbgPrint((DPRINT_FILESYSTEM
, "FatGetFirstNameFromPath() Path = %s FirstName = %s\n", Path
, Buffer
));
701 * This function parses a directory entry name which
702 * is in the form of "FILE EXT" and puts it in Buffer
703 * in the form of "file.ext"
705 void FatParseShortFileName(PUCHAR Buffer
, PDIRENTRY DirEntry
)
712 // Fixup first character
714 if (DirEntry
->FileName
[0] == 0x05)
716 DirEntry
->FileName
[0] = 0xE5;
724 if (DirEntry
->FileName
[Idx
] == ' ')
729 Buffer
[Idx
] = DirEntry
->FileName
[Idx
];
736 if ((DirEntry
->FileName
[8] != ' '))
739 Buffer
[Idx
++] = (DirEntry
->FileName
[8] == ' ') ? '\0' : DirEntry
->FileName
[8];
740 Buffer
[Idx
++] = (DirEntry
->FileName
[9] == ' ') ? '\0' : DirEntry
->FileName
[9];
741 Buffer
[Idx
++] = (DirEntry
->FileName
[10] == ' ') ? '\0' : DirEntry
->FileName
[10];
745 // Null-Terminate string
747 Buffer
[Idx
+ 4] = '\0';
749 DbgPrint((DPRINT_FILESYSTEM
, "FatParseShortFileName() ShortName = %s\n", Buffer
));
754 * returns the Fat entry for a given cluster number
756 BOOL
FatGetFatEntry(UINT32 Cluster
, PUINT32 ClusterPointer
)
761 int ThisFatEntOffset
;
763 DbgPrint((DPRINT_FILESYSTEM
, "FatGetFatEntry() Retrieving FAT entry for cluster %d.\n", Cluster
));
769 FatOffset
= Cluster
+ (Cluster
/ 2);
770 ThisFatSecNum
= FatVolumeBootSector
->ReservedSectors
+ (FatOffset
/ FatVolumeBootSector
->BytesPerSector
);
771 ThisFatEntOffset
= (FatOffset
% FatVolumeBootSector
->BytesPerSector
);
773 DbgPrint((DPRINT_FILESYSTEM
, "FatOffset: %d\n", FatOffset
));
774 DbgPrint((DPRINT_FILESYSTEM
, "ThisFatSecNum: %d\n", ThisFatSecNum
));
775 DbgPrint((DPRINT_FILESYSTEM
, "ThisFatEntOffset: %d\n", ThisFatEntOffset
));
777 if (ThisFatEntOffset
== (FatVolumeBootSector
->BytesPerSector
- 1))
779 if (!FatReadVolumeSectors(FatDriveNumber
, ThisFatSecNum
, 2, (PVOID
)FILESYSBUFFER
))
786 if (!FatReadVolumeSectors(FatDriveNumber
, ThisFatSecNum
, 1, (PVOID
)FILESYSBUFFER
))
792 fat
= *((WORD
*) ((PVOID
)FILESYSBUFFER
+ ThisFatEntOffset
));
793 if (Cluster
& 0x0001)
794 fat
= fat
>> 4; /* Cluster number is ODD */
796 fat
= fat
& 0x0FFF; /* Cluster number is EVEN */
802 FatOffset
= (Cluster
* 2);
803 ThisFatSecNum
= FatVolumeBootSector
->ReservedSectors
+ (FatOffset
/ FatVolumeBootSector
->BytesPerSector
);
804 ThisFatEntOffset
= (FatOffset
% FatVolumeBootSector
->BytesPerSector
);
806 if (!FatReadVolumeSectors(FatDriveNumber
, ThisFatSecNum
, 1, (PVOID
)FILESYSBUFFER
))
811 fat
= *((WORD
*) ((PVOID
)FILESYSBUFFER
+ ThisFatEntOffset
));
817 FatOffset
= (Cluster
* 4);
818 ThisFatSecNum
= (Fat32VolumeBootSector
->ExtendedFlags
& 0x80) ? ((Fat32VolumeBootSector
->ExtendedFlags
& 0x0f) * Fat32VolumeBootSector
->SectorsPerFatBig
) : 0; // Get the active fat sector offset
819 ThisFatSecNum
+= FatVolumeBootSector
->ReservedSectors
+ (FatOffset
/ FatVolumeBootSector
->BytesPerSector
);
820 ThisFatEntOffset
= (FatOffset
% FatVolumeBootSector
->BytesPerSector
);
822 if (!FatReadVolumeSectors(FatDriveNumber
, ThisFatSecNum
, 1, (PVOID
)FILESYSBUFFER
))
828 fat
= (*((DWORD
*) ((PVOID
)FILESYSBUFFER
+ ThisFatEntOffset
))) & 0x0FFFFFFF;
834 DbgPrint((DPRINT_FILESYSTEM
, "FAT entry is 0x%x.\n", fat
));
836 *ClusterPointer
= fat
;
843 * Tries to open the file 'name' and returns true or false
844 * for success and failure respectively
846 FILE* FatOpenFile(PUCHAR FileName
)
848 FAT_FILE_INFO TempFatFileInfo
;
849 PFAT_FILE_INFO FileHandle
;
851 DbgPrint((DPRINT_FILESYSTEM
, "FatOpenFile() FileName = %s\n", FileName
));
853 if (!FatLookupFile(FileName
, &TempFatFileInfo
))
858 FileHandle
= AllocateMemory(sizeof(FAT_FILE_INFO
));
860 if (FileHandle
== NULL
)
865 memcpy(FileHandle
, &TempFatFileInfo
, sizeof(FAT_FILE_INFO
));
867 return (FILE*)FileHandle
;
870 UINT32
FatCountClustersInChain(UINT32 StartCluster
)
872 UINT32 ClusterCount
= 0;
874 DbgPrint((DPRINT_FILESYSTEM
, "FatCountClustersInChain() StartCluster = %d\n", StartCluster
));
879 // If end of chain then break out of our cluster counting loop
881 if (((FatType
== FAT12
) && (StartCluster
>= 0xff8)) ||
882 ((FatType
== FAT16
) && (StartCluster
>= 0xfff8)) ||
883 ((FatType
== FAT32
) && (StartCluster
>= 0x0ffffff8)))
896 if (!FatGetFatEntry(StartCluster
, &StartCluster
))
902 DbgPrint((DPRINT_FILESYSTEM
, "FatCountClustersInChain() ClusterCount = %d\n", ClusterCount
));
907 PUINT32
FatGetClusterChainArray(UINT32 StartCluster
)
911 PUINT32 ArrayPointer
;
914 DbgPrint((DPRINT_FILESYSTEM
, "FatGetClusterChainArray() StartCluster = %d\n", StartCluster
));
916 ClusterCount
= FatCountClustersInChain(StartCluster
) + 1; // Lets get the 0x0ffffff8 on the end of the array
917 ArraySize
= ClusterCount
* sizeof(UINT32
);
920 // Allocate array memory
922 ArrayPointer
= AllocateMemory(ArraySize
);
924 if (ArrayPointer
== NULL
)
930 // Loop through and set array values
932 for (Idx
=0; Idx
<ClusterCount
; Idx
++)
935 // Set current cluster
937 ArrayPointer
[Idx
] = StartCluster
;
940 // Don't try to get next cluster for last cluster
942 if (((FatType
== FAT12
) && (StartCluster
>= 0xff8)) ||
943 ((FatType
== FAT16
) && (StartCluster
>= 0xfff8)) ||
944 ((FatType
== FAT32
) && (StartCluster
>= 0x0ffffff8)))
953 if (!FatGetFatEntry(StartCluster
, &StartCluster
))
955 FreeMemory(ArrayPointer
);
965 * Reads the specified cluster into memory
966 * and returns the number of bytes read
968 BOOL
FatReadCluster(ULONG ClusterNumber
, PVOID Buffer
)
970 ULONG ClusterStartSector
;
972 ClusterStartSector
= ((ClusterNumber
- 2) * FatVolumeBootSector
->SectorsPerCluster
) + DataSectorStart
;
974 DbgPrint((DPRINT_FILESYSTEM
, "FatReadCluster() ClusterNumber = %d Buffer = 0x%x ClusterStartSector = %d\n", ClusterNumber
, Buffer
, ClusterStartSector
));
976 if (!FatReadVolumeSectors(FatDriveNumber
, ClusterStartSector
, FatVolumeBootSector
->SectorsPerCluster
, (PVOID
)FILESYSBUFFER
))
981 memcpy(Buffer
, (PVOID
)FILESYSBUFFER
, FatVolumeBootSector
->SectorsPerCluster
* FatVolumeBootSector
->BytesPerSector
);
987 * FatReadClusterChain()
988 * Reads the specified clusters into memory
990 BOOL
FatReadClusterChain(ULONG StartClusterNumber
, ULONG NumberOfClusters
, PVOID Buffer
)
992 ULONG ClusterStartSector
;
994 DbgPrint((DPRINT_FILESYSTEM
, "FatReadClusterChain() StartClusterNumber = %d NumberOfClusters = %d Buffer = 0x%x\n", StartClusterNumber
, NumberOfClusters
, Buffer
));
996 while (NumberOfClusters
> 0)
999 DbgPrint((DPRINT_FILESYSTEM
, "FatReadClusterChain() StartClusterNumber = %d NumberOfClusters = %d Buffer = 0x%x\n", StartClusterNumber
, NumberOfClusters
, Buffer
));
1001 // Calculate starting sector for cluster
1003 ClusterStartSector
= ((StartClusterNumber
- 2) * FatVolumeBootSector
->SectorsPerCluster
) + DataSectorStart
;
1006 // Read cluster into memory
1008 if (!FatReadVolumeSectors(FatDriveNumber
, ClusterStartSector
, FatVolumeBootSector
->SectorsPerCluster
, (PVOID
)FILESYSBUFFER
))
1013 memcpy(Buffer
, (PVOID
)FILESYSBUFFER
, FatVolumeBootSector
->SectorsPerCluster
* FatVolumeBootSector
->BytesPerSector
);
1016 // Decrement count of clusters left to read
1021 // Increment buffer address by cluster size
1023 Buffer
+= (FatVolumeBootSector
->SectorsPerCluster
* FatVolumeBootSector
->BytesPerSector
);
1028 if (!FatGetFatEntry(StartClusterNumber
, &StartClusterNumber
))
1034 // If end of chain then break out of our cluster reading loop
1036 if (((FatType
== FAT12
) && (StartClusterNumber
>= 0xff8)) ||
1037 ((FatType
== FAT16
) && (StartClusterNumber
>= 0xfff8)) ||
1038 ((FatType
== FAT32
) && (StartClusterNumber
>= 0x0ffffff8)))
1048 * FatReadPartialCluster()
1049 * Reads part of a cluster into memory
1051 BOOL
FatReadPartialCluster(ULONG ClusterNumber
, ULONG StartingOffset
, ULONG Length
, PVOID Buffer
)
1053 ULONG ClusterStartSector
;
1055 DbgPrint((DPRINT_FILESYSTEM
, "FatReadPartialCluster() ClusterNumber = %d StartingOffset = %d Length = %d Buffer = 0x%x\n", ClusterNumber
, StartingOffset
, Length
, Buffer
));
1057 ClusterStartSector
= ((ClusterNumber
- 2) * FatVolumeBootSector
->SectorsPerCluster
) + DataSectorStart
;
1059 if (!FatReadVolumeSectors(FatDriveNumber
, ClusterStartSector
, FatVolumeBootSector
->SectorsPerCluster
, (PVOID
)FILESYSBUFFER
))
1064 memcpy(Buffer
, ((PVOID
)FILESYSBUFFER
+ StartingOffset
), Length
);
1071 * Reads BytesToRead from open file and
1072 * returns the number of bytes read in BytesRead
1074 BOOL
FatReadFile(FILE *FileHandle
, ULONG BytesToRead
, PULONG BytesRead
, PVOID Buffer
)
1076 PFAT_FILE_INFO FatFileInfo
= (PFAT_FILE_INFO
)FileHandle
;
1077 UINT32 ClusterNumber
;
1078 UINT32 OffsetInCluster
;
1079 UINT32 LengthInCluster
;
1080 UINT32 NumberOfClusters
;
1081 UINT32 BytesPerCluster
;
1083 DbgPrint((DPRINT_FILESYSTEM
, "FatReadFile() BytesToRead = %d Buffer = 0x%x\n", BytesToRead
, Buffer
));
1085 if (BytesRead
!= NULL
)
1091 // If they are trying to read past the
1092 // end of the file then return success
1093 // with BytesRead == 0
1095 if (FatFileInfo
->FilePointer
>= FatFileInfo
->FileSize
)
1101 // If they are trying to read more than there is to read
1102 // then adjust the amount to read
1104 if ((FatFileInfo
->FilePointer
+ BytesToRead
) > FatFileInfo
->FileSize
)
1106 BytesToRead
= (FatFileInfo
->FileSize
- FatFileInfo
->FilePointer
);
1110 // Ok, now we have to perform at most 3 calculations
1111 // I'll draw you a picture (using nifty ASCII art):
1113 // CurrentFilePointer -+
1115 // +----------------+
1117 // +-----------+-----------+-----------+-----------+
1118 // | Cluster 1 | Cluster 2 | Cluster 3 | Cluster 4 |
1119 // +-----------+-----------+-----------+-----------+
1121 // +---------------+--------------------+
1123 // BytesToRead -------+
1125 // 1 - The first calculation (and read) will align
1126 // the file pointer with the next cluster.
1127 // boundary (if we are supposed to read that much)
1128 // 2 - The next calculation (and read) will read
1129 // in all the full clusters that the requested
1130 // amount of data would cover (in this case
1132 // 3 - The last calculation (and read) would read
1133 // in the remainder of the data requested out of
1134 // the last cluster.
1137 BytesPerCluster
= (FatVolumeBootSector
->SectorsPerCluster
* FatVolumeBootSector
->BytesPerSector
);
1140 // Only do the first read if we
1141 // aren't aligned on a cluster boundary
1143 if (FatFileInfo
->FilePointer
% BytesPerCluster
)
1146 // Do the math for our first read
1148 ClusterNumber
= (FatFileInfo
->FilePointer
/ BytesPerCluster
);
1149 ClusterNumber
= FatFileInfo
->FileFatChain
[ClusterNumber
];
1150 OffsetInCluster
= (FatFileInfo
->FilePointer
% BytesPerCluster
);
1151 LengthInCluster
= (BytesToRead
> (BytesPerCluster
- OffsetInCluster
)) ? (BytesPerCluster
- OffsetInCluster
) : BytesToRead
;
1154 // Now do the read and update BytesRead, BytesToRead, FilePointer, & Buffer
1156 if (!FatReadPartialCluster(ClusterNumber
, OffsetInCluster
, LengthInCluster
, Buffer
))
1160 if (BytesRead
!= NULL
)
1162 *BytesRead
+= LengthInCluster
;
1164 BytesToRead
-= LengthInCluster
;
1165 FatFileInfo
->FilePointer
+= LengthInCluster
;
1166 Buffer
+= LengthInCluster
;
1170 // Do the math for our second read (if any data left)
1172 if (BytesToRead
> 0)
1175 // Determine how many full clusters we need to read
1177 NumberOfClusters
= (BytesToRead
/ BytesPerCluster
);
1179 if (NumberOfClusters
> 0)
1181 ClusterNumber
= (FatFileInfo
->FilePointer
/ BytesPerCluster
);
1182 ClusterNumber
= FatFileInfo
->FileFatChain
[ClusterNumber
];
1185 // Now do the read and update BytesRead, BytesToRead, FilePointer, & Buffer
1187 if (!FatReadClusterChain(ClusterNumber
, NumberOfClusters
, Buffer
))
1191 if (BytesRead
!= NULL
)
1193 *BytesRead
+= (NumberOfClusters
* BytesPerCluster
);
1195 BytesToRead
-= (NumberOfClusters
* BytesPerCluster
);
1196 FatFileInfo
->FilePointer
+= (NumberOfClusters
* BytesPerCluster
);
1197 Buffer
+= (NumberOfClusters
* BytesPerCluster
);
1202 // Do the math for our third read (if any data left)
1204 if (BytesToRead
> 0)
1206 ClusterNumber
= (FatFileInfo
->FilePointer
/ BytesPerCluster
);
1207 ClusterNumber
= FatFileInfo
->FileFatChain
[ClusterNumber
];
1210 // Now do the read and update BytesRead, BytesToRead, FilePointer, & Buffer
1212 if (!FatReadPartialCluster(ClusterNumber
, 0, BytesToRead
, Buffer
))
1216 if (BytesRead
!= NULL
)
1218 *BytesRead
+= BytesToRead
;
1220 BytesToRead
-= BytesToRead
;
1221 FatFileInfo
->FilePointer
+= BytesToRead
;
1222 Buffer
+= BytesToRead
;
1228 ULONG
FatGetFileSize(FILE *FileHandle
)
1230 PFAT_FILE_INFO FatFileHandle
= (PFAT_FILE_INFO
)FileHandle
;
1232 DbgPrint((DPRINT_FILESYSTEM
, "FatGetFileSize() FileSize = %d\n", FatFileHandle
->FileSize
));
1234 return FatFileHandle
->FileSize
;
1237 VOID
FatSetFilePointer(FILE *FileHandle
, ULONG NewFilePointer
)
1239 PFAT_FILE_INFO FatFileHandle
= (PFAT_FILE_INFO
)FileHandle
;
1241 DbgPrint((DPRINT_FILESYSTEM
, "FatSetFilePointer() NewFilePointer = %d\n", NewFilePointer
));
1243 FatFileHandle
->FilePointer
= NewFilePointer
;
1246 ULONG
FatGetFilePointer(FILE *FileHandle
)
1248 PFAT_FILE_INFO FatFileHandle
= (PFAT_FILE_INFO
)FileHandle
;
1250 DbgPrint((DPRINT_FILESYSTEM
, "FatGetFilePointer() FilePointer = %d\n", FatFileHandle
->FilePointer
));
1252 return FatFileHandle
->FilePointer
;
1255 BOOL
FatReadVolumeSectors(ULONG DriveNumber
, ULONG SectorNumber
, ULONG SectorCount
, PVOID Buffer
)
1257 //return DiskReadMultipleLogicalSectors(DriveNumber, SectorNumber + FatVolumeBootSector->HiddenSectors, SectorCount, Buffer);
1258 return CacheReadDiskSectors(DriveNumber
, SectorNumber
+ FatVolumeBootSector
->HiddenSectors
, SectorCount
, Buffer
);