test: fat_rec.h File Reference

Define Documentation

#define CopyUchar1	(	Dst,
		Src		)

Value:

{                                \
    *((UCHAR1 *)(Dst)) = *((UNALIGNED UCHAR1 *)(Src)); \
    }

Definition at line 50 of file fat_rec.h.

Referenced by UnpackBiosParameterBlock().

#define CopyUchar2	(	Dst,
		Src		)

Value:

{                                \
    *((UCHAR2 *)(Dst)) = *((UNALIGNED UCHAR2 *)(Src)); \
    }

Definition at line 58 of file fat_rec.h.

Referenced by UnpackBiosParameterBlock().

#define CopyUchar4	(	Dst,
		Src		)

Value:

{                                \
    *((UCHAR4 *)(Dst)) = *((UNALIGNED UCHAR4 *)(Src)); \
    }

Definition at line 66 of file fat_rec.h.

Referenced by UnpackBiosParameterBlock().

Typedef Documentation

Function Documentation

BOOLEAN IsFatVolume

(

IN PPACKED_BOOT_SECTOR

Buffer

)

Definition at line 184 of file fat_rec.c.

References Buffer, BIOS_PARAMETER_BLOCK::BytesPerSector, FALSE, BIOS_PARAMETER_BLOCK::Fats, BIOS_PARAMETER_BLOCK::LargeSectors, BIOS_PARAMETER_BLOCK::Media, PAGED_CODE, BIOS_PARAMETER_BLOCK::ReservedSectors, BIOS_PARAMETER_BLOCK::RootEntries, BIOS_PARAMETER_BLOCK::Sectors, BIOS_PARAMETER_BLOCK::SectorsPerCluster, BIOS_PARAMETER_BLOCK::SectorsPerFat, TRUE, and UnpackBiosParameterBlock().

Referenced by FatRecFsControl().

00190                    :
00191 
00192     This routine looks at the buffer passed in which contains the FAT boot
00193     sector and determines whether or not it represents an actual FAT boot
00194     sector.
00195 
00196 Arguments:
00197 
00198     Buffer - Pointer to buffer containing potential boot block.
00199 
00200 Return Value:
00201 
00202     The function returns TRUE if the buffer contains a recognizable FAT boot
00203     sector, otherwise it returns FALSE.
00204 
00205 --*/
00206 
00207 {
00208     BIOS_PARAMETER_BLOCK bios;
00209     BOOLEAN result;
00210 
00211     PAGED_CODE();
00212 
00213     //
00214     // Begin by unpacking the Bios Parameter Block that is packed in the boot
00215     // sector so that it can be examined without incurring alignment faults.
00216     //
00217 
00218     UnpackBiosParameterBlock( &Buffer->PackedBpb, &bios );
00219 
00220     //
00221     // Assume that the sector represents a FAT boot block and then determine
00222     // whether or not it really does.
00223     //
00224 
00225     result = TRUE;
00226 
00227     if (bios.Sectors) {
00228         bios.LargeSectors = 0;
00229     }
00230 
00231     // FMR Jul.11.1994 NaokiM - Fujitsu -
00232     // FMR boot sector has 'IPL1' string at the beginnig.
00233 
00234     if (Buffer->Jump[0] != 0x49 && /* FMR */
00235         Buffer->Jump[0] != 0xe9 &&
00236         Buffer->Jump[0] != 0xeb) {
00237 
00238         result = FALSE;
00239 
00240 
00241     // FMR Jul.11.1994 NaokiM - Fujitsu -
00242     // Sector size of FMR partition is 2048.
00243 
00244     } else if (bios.BytesPerSector !=  128 &&
00245                bios.BytesPerSector !=  256 &&
00246                bios.BytesPerSector !=  512 &&
00247                bios.BytesPerSector != 1024 &&
00248                bios.BytesPerSector != 2048 && /* FMR */
00249                bios.BytesPerSector != 4096) {
00250 
00251         result = FALSE;
00252 
00253     } else if (bios.SectorsPerCluster !=  1 &&
00254                bios.SectorsPerCluster !=  2 &&
00255                bios.SectorsPerCluster !=  4 &&
00256                bios.SectorsPerCluster !=  8 &&
00257                bios.SectorsPerCluster != 16 &&
00258                bios.SectorsPerCluster != 32 &&
00259                bios.SectorsPerCluster != 64 &&
00260                bios.SectorsPerCluster != 128) {
00261 
00262         result = FALSE;
00263 
00264     } else if (!bios.ReservedSectors) {
00265 
00266         result = FALSE;
00267 
00268     } else if (!bios.Fats) {
00269 
00270         result = FALSE;
00271 
00272     //
00273     // Prior to DOS 3.2 might contains value in both of Sectors and
00274     // Sectors Large.
00275     //
00276     } else if (!bios.Sectors && !bios.LargeSectors) {
00277 
00278         result = FALSE;
00279 
00280     // FMR Jul.11.1994 NaokiM - Fujitsu -
00281     // 1. Media descriptor of FMR partitions is 0xfa.
00282     // 2. Media descriptor of partitions formated by FMR OS/2 is 0x00.
00283     // 3. Media descriptor of floppy disks formated by FMR DOS is 0x01.
00284 
00285     } else if (bios.Media != 0x00 && /* FMR */
00286                bios.Media != 0x01 && /* FMR */
00287                bios.Media != 0xf0 &&
00288                bios.Media != 0xf8 &&
00289                bios.Media != 0xf9 &&
00290                bios.Media != 0xfa && /* FMR */
00291                bios.Media != 0xfb &&
00292                bios.Media != 0xfc &&
00293                bios.Media != 0xfd &&
00294                bios.Media != 0xfe &&
00295                bios.Media != 0xff) {
00296 
00297         result = FALSE;
00298 
00299     } else if (bios.SectorsPerFat != 0 && bios.RootEntries == 0) {
00300 
00301         result = FALSE;
00302     }
00303 
00304     return result;
00305 }

VOID UnpackBiosParameterBlock	(	IN PPACKED_BIOS_PARAMETER_BLOCK	Bios,
		OUT PBIOS_PARAMETER_BLOCK	UnpackedBios
	)

Definition at line 309 of file fat_rec.c.

References CopyUchar1, CopyUchar2, CopyUchar4, PAGED_CODE, PBIOS_PARAMETER_BLOCK, and PPACKED_BIOS_PARAMETER_BLOCK.

Referenced by IsFatVolume().

00316                    :
00317 
00318     This routine copies a packed Bios Parameter Block to an unpacked Bios
00319     Parameter Block.
00320 
00321 Arguments:
00322 
00323     Bios - Pointer to the packed Bios Parameter Block.
00324 
00325     UnpackedBios - Pointer to the unpacked Bios Parameter Block.
00326 
00327 Return Value:
00328 
00329     None.
00330 
00331 --*/
00332 
00333 {
00334     PAGED_CODE();
00335 
00336     //
00337     // Unpack the Bios Parameter Block.
00338     //
00339 
00340     CopyUchar2( &UnpackedBios->BytesPerSector, &Bios->BytesPerSector[0] );
00341     CopyUchar2( &UnpackedBios->BytesPerSector, &Bios->BytesPerSector[0] );
00342     CopyUchar1( &UnpackedBios->SectorsPerCluster, &Bios->SectorsPerCluster[0] );
00343     CopyUchar2( &UnpackedBios->ReservedSectors, &Bios->ReservedSectors[0] );
00344     CopyUchar1( &UnpackedBios->Fats, &Bios->Fats[0] );
00345     CopyUchar2( &UnpackedBios->RootEntries, &Bios->RootEntries[0] );
00346     CopyUchar2( &UnpackedBios->Sectors, &Bios->Sectors[0] );
00347     CopyUchar1( &UnpackedBios->Media, &Bios->Media[0] );
00348     CopyUchar2( &UnpackedBios->SectorsPerFat, &Bios->SectorsPerFat[0] );
00349     CopyUchar2( &UnpackedBios->SectorsPerTrack, &Bios->SectorsPerTrack[0] );
00350     CopyUchar2( &UnpackedBios->Heads, &Bios->Heads[0] );
00351     CopyUchar4( &UnpackedBios->HiddenSectors, &Bios->HiddenSectors[0] );
00352     CopyUchar4( &UnpackedBios->LargeSectors, &Bios->LargeSectors[0] );
00353 }
}

Generated on Sat May 15 19:43:36 2004 for test by

1.3.7


Classes
union	_UCHAR1
union	_UCHAR2
union	_UCHAR4
struct	_PACKED_BIOS_PARAMETER_BLOCK
struct	BIOS_PARAMETER_BLOCK
struct	_PACKED_BOOT_SECTOR
Defines
#define	CopyUchar1(Dst, Src)
#define	CopyUchar2(Dst, Src)
#define	CopyUchar4(Dst, Src)
Typedefs
typedef _UCHAR1	UCHAR1
typedef _UCHAR1 *	PUCHAR1
typedef _UCHAR2	UCHAR2
typedef _UCHAR2 *	PUCHAR2
typedef _UCHAR4	UCHAR4
typedef _UCHAR4 *	PUCHAR4
typedef _PACKED_BIOS_PARAMETER_BLOCK	PACKED_BIOS_PARAMETER_BLOCK
typedef PACKED_BIOS_PARAMETER_BLOCK *	PPACKED_BIOS_PARAMETER_BLOCK
typedef BIOS_PARAMETER_BLOCK	BIOS_PARAMETER_BLOCK
typedef BIOS_PARAMETER_BLOCK *	PBIOS_PARAMETER_BLOCK
typedef _PACKED_BOOT_SECTOR	PACKED_BOOT_SECTOR
typedef PACKED_BOOT_SECTOR *	PPACKED_BOOT_SECTOR
Functions
BOOLEAN	IsFatVolume (IN PPACKED_BOOT_SECTOR Buffer)
VOID	UnpackBiosParameterBlock (IN PPACKED_BIOS_PARAMETER_BLOCK Bios, OUT PBIOS_PARAMETER_BLOCK UnpackedBios)

fat_rec.h File Reference

Classes

Defines

Typedefs

Functions

Define Documentation

Typedef Documentation

Function Documentation