mirror of
https://github.com/reactos/reactos.git
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Rework FAT filesystem to not be tied to boot filesystem
svn path=/trunk/; revision=43267
This commit is contained in:
Hervé Poussineau
parent
8ccb271064
commit
c599bd7dc0
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@ -23,33 +23,34 @@
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#include <debug.h>
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ULONG FatDetermineFatType(PFAT_BOOTSECTOR FatBootSector, ULONG PartitionSectorCount);
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PVOID FatBufferDirectory(ULONG DirectoryStartCluster, ULONG* EntryCountPointer, BOOLEAN RootDirectory);
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BOOLEAN FatSearchDirectoryBufferForFile(PVOID DirectoryBuffer, ULONG EntryCount, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer);
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LONG FatLookupFile(PCSTR FileName, ULONG DeviceId, PFAT_FILE_INFO FatFileInfoPointer);
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PVOID FatBufferDirectory(PFAT_VOLUME_INFO Volume, ULONG DirectoryStartCluster, ULONG* EntryCountPointer, BOOLEAN RootDirectory);
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BOOLEAN FatSearchDirectoryBufferForFile(PFAT_VOLUME_INFO Volume, PVOID DirectoryBuffer, ULONG EntryCount, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer);
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LONG FatLookupFile(PFAT_VOLUME_INFO Volume, PCSTR FileName, ULONG DeviceId, PFAT_FILE_INFO FatFileInfoPointer);
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void FatParseShortFileName(PCHAR Buffer, PDIRENTRY DirEntry);
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BOOLEAN FatGetFatEntry(ULONG Cluster, ULONG* ClusterPointer);
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ULONG FatCountClustersInChain(ULONG StartCluster);
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ULONG* FatGetClusterChainArray(ULONG StartCluster);
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BOOLEAN FatReadCluster(ULONG ClusterNumber, PVOID Buffer);
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BOOLEAN FatReadClusterChain(ULONG StartClusterNumber, ULONG NumberOfClusters, PVOID Buffer);
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BOOLEAN FatReadPartialCluster(ULONG ClusterNumber, ULONG StartingOffset, ULONG Length, PVOID Buffer);
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BOOLEAN FatReadFile(PFAT_FILE_INFO FatFileInfo, ULONG BytesToRead, ULONG* BytesRead, PVOID Buffer);
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BOOLEAN FatReadVolumeSectors(ULONG DriveNumber, ULONG SectorNumber, ULONG SectorCount, PVOID Buffer);
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BOOLEAN FatGetFatEntry(PFAT_VOLUME_INFO Volume, ULONG Cluster, ULONG* ClusterPointer);
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ULONG FatCountClustersInChain(PFAT_VOLUME_INFO Volume, ULONG StartCluster);
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ULONG* FatGetClusterChainArray(PFAT_VOLUME_INFO Volume, ULONG StartCluster);
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BOOLEAN FatReadClusterChain(PFAT_VOLUME_INFO Volume, ULONG StartClusterNumber, ULONG NumberOfClusters, PVOID Buffer);
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BOOLEAN FatReadPartialCluster(PFAT_VOLUME_INFO Volume, ULONG ClusterNumber, ULONG StartingOffset, ULONG Length, PVOID Buffer);
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BOOLEAN FatReadVolumeSectors(PFAT_VOLUME_INFO Volume, ULONG SectorNumber, ULONG SectorCount, PVOID Buffer);
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ULONG BytesPerSector; /* Number of bytes per sector */
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ULONG SectorsPerCluster; /* Number of sectors per cluster */
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ULONG FatVolumeStartSector; /* Absolute starting sector of the partition */
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ULONG FatSectorStart; /* Starting sector of 1st FAT table */
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ULONG ActiveFatSectorStart; /* Starting sector of active FAT table */
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ULONG NumberOfFats; /* Number of FAT tables */
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ULONG SectorsPerFat; /* Sectors per FAT table */
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ULONG RootDirSectorStart; /* Starting sector of the root directory (non-fat32) */
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ULONG RootDirSectors; /* Number of sectors of the root directory (non-fat32) */
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ULONG RootDirStartCluster; /* Starting cluster number of the root directory (fat32 only) */
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ULONG DataSectorStart; /* Starting sector of the data area */
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typedef struct _FAT_VOLUME_INFO
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{
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ULONG BytesPerSector; /* Number of bytes per sector */
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ULONG SectorsPerCluster; /* Number of sectors per cluster */
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ULONG FatSectorStart; /* Starting sector of 1st FAT table */
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ULONG ActiveFatSectorStart; /* Starting sector of active FAT table */
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ULONG NumberOfFats; /* Number of FAT tables */
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ULONG SectorsPerFat; /* Sectors per FAT table */
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ULONG RootDirSectorStart; /* Starting sector of the root directory (non-fat32) */
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ULONG RootDirSectors; /* Number of sectors of the root directory (non-fat32) */
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ULONG RootDirStartCluster; /* Starting cluster number of the root directory (fat32 only) */
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ULONG DataSectorStart; /* Starting sector of the data area */
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ULONG FatType; /* FAT12, FAT16, FAT32, FATX16 or FATX32 */
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ULONG DeviceId;
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} FAT_VOLUME_INFO;
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ULONG FatType = 0; /* FAT12, FAT16, FAT32, FATX16 or FATX32 */
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ULONG FatDriveNumber = 0;
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PFAT_VOLUME_INFO FatVolumes[MAX_FDS];
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VOID FatSwapFatBootSector(PFAT_BOOTSECTOR Obj)
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{
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@ -129,7 +130,7 @@ VOID FatSwapFatXDirEntry(PFATX_DIRENTRY Obj)
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SW(Obj, LastAccessDate);
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}
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BOOLEAN FatOpenVolume(UCHAR DriveNumber, ULONGLONG VolumeStartSector, ULONGLONG PartitionSectorCount)
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BOOLEAN FatOpenVolume(PFAT_VOLUME_INFO Volume, PFAT_BOOTSECTOR BootSector, ULONGLONG PartitionSectorCount)
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{
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char ErrMsg[80];
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ULONG FatSize;
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@ -137,42 +138,21 @@ BOOLEAN FatOpenVolume(UCHAR DriveNumber, ULONGLONG VolumeStartSector, ULONGLONG
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PFAT32_BOOTSECTOR Fat32VolumeBootSector;
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PFATX_BOOTSECTOR FatXVolumeBootSector;
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DPRINTM(DPRINT_FILESYSTEM, "FatOpenVolume() DriveNumber = 0x%x VolumeStartSector = %d\n", DriveNumber, VolumeStartSector);
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// Store the drive number
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FatDriveNumber = DriveNumber;
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DPRINTM(DPRINT_FILESYSTEM, "FatOpenVolume() DeviceId = %d\n", Volume->DeviceId);
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//
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// Allocate the memory to hold the boot sector
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//
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FatVolumeBootSector = (PFAT_BOOTSECTOR) MmHeapAlloc(512);
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Fat32VolumeBootSector = (PFAT32_BOOTSECTOR) FatVolumeBootSector;
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FatXVolumeBootSector = (PFATX_BOOTSECTOR) FatVolumeBootSector;
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//
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// Make sure we got the memory
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//
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if (FatVolumeBootSector == NULL)
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{
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FileSystemError("Out of memory.");
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return FALSE;
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}
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// Now try to read the boot sector
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// If this fails then abort
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if (!MachDiskReadLogicalSectors(DriveNumber, VolumeStartSector, 1, (PVOID)DISKREADBUFFER))
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{
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MmHeapFree(FatVolumeBootSector);
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return FALSE;
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}
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RtlCopyMemory(FatVolumeBootSector, (PVOID)DISKREADBUFFER, 512);
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FatVolumeBootSector = (PFAT_BOOTSECTOR)BootSector;
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Fat32VolumeBootSector = (PFAT32_BOOTSECTOR)BootSector;
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FatXVolumeBootSector = (PFATX_BOOTSECTOR)BootSector;
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// Get the FAT type
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FatType = FatDetermineFatType(FatVolumeBootSector, PartitionSectorCount);
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Volume->FatType = FatDetermineFatType(FatVolumeBootSector, PartitionSectorCount);
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// Dump boot sector (and swap it for big endian systems)
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DPRINTM(DPRINT_FILESYSTEM, "Dumping boot sector:\n");
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if (ISFATX(FatType))
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if (ISFATX(Volume->FatType))
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{
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FatSwapFatXBootSector(FatXVolumeBootSector);
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DPRINTM(DPRINT_FILESYSTEM, "sizeof(FATX_BOOTSECTOR) = 0x%x.\n", sizeof(FATX_BOOTSECTOR));
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@ -183,10 +163,10 @@ BOOLEAN FatOpenVolume(UCHAR DriveNumber, ULONGLONG VolumeStartSector, ULONGLONG
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DPRINTM(DPRINT_FILESYSTEM, "NumberOfFats: %d\n", FatXVolumeBootSector->NumberOfFats);
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DPRINTM(DPRINT_FILESYSTEM, "Unknown: 0x%x\n", FatXVolumeBootSector->Unknown);
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DPRINTM(DPRINT_FILESYSTEM, "FatType %s\n", FatType == FATX16 ? "FATX16" : "FATX32");
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DPRINTM(DPRINT_FILESYSTEM, "FatType %s\n", Volume->FatType == FATX16 ? "FATX16" : "FATX32");
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}
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else if (FatType == FAT32)
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else if (Volume->FatType == FAT32)
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{
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FatSwapFat32BootSector(Fat32VolumeBootSector);
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DPRINTM(DPRINT_FILESYSTEM, "sizeof(FAT32_BOOTSECTOR) = 0x%x.\n", sizeof(FAT32_BOOTSECTOR));
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@ -248,20 +228,14 @@ BOOLEAN FatOpenVolume(UCHAR DriveNumber, ULONGLONG VolumeStartSector, ULONGLONG
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DPRINTM(DPRINT_FILESYSTEM, "BootSectorMagic: 0x%x\n", FatVolumeBootSector->BootSectorMagic);
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}
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//
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// Set the correct partition offset
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//
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FatVolumeStartSector = VolumeStartSector;
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//
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// Check the boot sector magic
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//
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if (! ISFATX(FatType) && FatVolumeBootSector->BootSectorMagic != 0xaa55)
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if (! ISFATX(Volume->FatType) && FatVolumeBootSector->BootSectorMagic != 0xaa55)
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{
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sprintf(ErrMsg, "Invalid boot sector magic on drive 0x%x (expected 0xaa55 found 0x%x)",
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DriveNumber, FatVolumeBootSector->BootSectorMagic);
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sprintf(ErrMsg, "Invalid boot sector magic (expected 0xaa55 found 0x%x)",
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FatVolumeBootSector->BootSectorMagic);
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FileSystemError(ErrMsg);
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MmHeapFree(FatVolumeBootSector);
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return FALSE;
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}
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@ -269,72 +243,60 @@ BOOLEAN FatOpenVolume(UCHAR DriveNumber, ULONGLONG VolumeStartSector, ULONGLONG
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// Check the FAT cluster size
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// We do not support clusters bigger than 64k
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//
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if ((ISFATX(FatType) && 64 * 1024 < FatXVolumeBootSector->SectorsPerCluster * 512) ||
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(! ISFATX(FatType) && 64 * 1024 < FatVolumeBootSector->SectorsPerCluster * FatVolumeBootSector->BytesPerSector))
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if ((ISFATX(Volume->FatType) && 64 * 1024 < FatXVolumeBootSector->SectorsPerCluster * 512) ||
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(! ISFATX(Volume->FatType) && 64 * 1024 < FatVolumeBootSector->SectorsPerCluster * FatVolumeBootSector->BytesPerSector))
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{
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FileSystemError("This file system has cluster sizes bigger than 64k.\nFreeLoader does not support this.");
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MmHeapFree(FatVolumeBootSector);
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return FALSE;
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}
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//
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// Clear our variables
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//
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FatSectorStart = 0;
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ActiveFatSectorStart = 0;
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NumberOfFats = 0;
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RootDirSectorStart = 0;
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DataSectorStart = 0;
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SectorsPerFat = 0;
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RootDirSectors = 0;
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//
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// Get the sectors per FAT,
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// root directory starting sector,
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// and data sector start
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//
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if (ISFATX(FatType))
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if (ISFATX(Volume->FatType))
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{
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BytesPerSector = 512;
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SectorsPerCluster = SWAPD(FatXVolumeBootSector->SectorsPerCluster);
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FatSectorStart = (4096 / BytesPerSector);
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ActiveFatSectorStart = FatSectorStart;
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NumberOfFats = 1;
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FatSize = PartitionSectorCount / SectorsPerCluster *
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(FATX16 == FatType ? 2 : 4);
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SectorsPerFat = (((FatSize + 4095) / 4096) * 4096) / BytesPerSector;
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Volume->BytesPerSector = 512;
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Volume->SectorsPerCluster = SWAPD(FatXVolumeBootSector->SectorsPerCluster);
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Volume->FatSectorStart = (4096 / Volume->BytesPerSector);
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Volume->ActiveFatSectorStart = Volume->FatSectorStart;
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Volume->NumberOfFats = 1;
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FatSize = PartitionSectorCount / Volume->SectorsPerCluster *
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(Volume->FatType == FATX16 ? 2 : 4);
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Volume->SectorsPerFat = (((FatSize + 4095) / 4096) * 4096) / Volume->BytesPerSector;
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RootDirSectorStart = FatSectorStart + NumberOfFats * SectorsPerFat;
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RootDirSectors = FatXVolumeBootSector->SectorsPerCluster;
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Volume->RootDirSectorStart = Volume->FatSectorStart + Volume->NumberOfFats * Volume->SectorsPerFat;
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Volume->RootDirSectors = FatXVolumeBootSector->SectorsPerCluster;
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DataSectorStart = RootDirSectorStart + RootDirSectors;
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Volume->DataSectorStart = Volume->RootDirSectorStart + Volume->RootDirSectors;
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}
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else if (FatType != FAT32)
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else if (Volume->FatType != FAT32)
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{
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BytesPerSector = FatVolumeBootSector->BytesPerSector;
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SectorsPerCluster = FatVolumeBootSector->SectorsPerCluster;
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FatSectorStart = FatVolumeBootSector->ReservedSectors;
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ActiveFatSectorStart = FatSectorStart;
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NumberOfFats = FatVolumeBootSector->NumberOfFats;
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SectorsPerFat = FatVolumeBootSector->SectorsPerFat;
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Volume->BytesPerSector = FatVolumeBootSector->BytesPerSector;
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Volume->SectorsPerCluster = FatVolumeBootSector->SectorsPerCluster;
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Volume->FatSectorStart = FatVolumeBootSector->ReservedSectors;
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Volume->ActiveFatSectorStart = Volume->FatSectorStart;
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Volume->NumberOfFats = FatVolumeBootSector->NumberOfFats;
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Volume->SectorsPerFat = FatVolumeBootSector->SectorsPerFat;
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RootDirSectorStart = FatSectorStart + NumberOfFats * SectorsPerFat;
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RootDirSectors = ((FatVolumeBootSector->RootDirEntries * 32) + (BytesPerSector - 1)) / BytesPerSector;
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Volume->RootDirSectorStart = Volume->FatSectorStart + Volume->NumberOfFats * Volume->SectorsPerFat;
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Volume->RootDirSectors = ((FatVolumeBootSector->RootDirEntries * 32) + (Volume->BytesPerSector - 1)) / Volume->BytesPerSector;
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DataSectorStart = RootDirSectorStart + RootDirSectors;
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Volume->DataSectorStart = Volume->RootDirSectorStart + Volume->RootDirSectors;
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}
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else
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{
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BytesPerSector = Fat32VolumeBootSector->BytesPerSector;
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SectorsPerCluster = Fat32VolumeBootSector->SectorsPerCluster;
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FatSectorStart = Fat32VolumeBootSector->ReservedSectors;
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ActiveFatSectorStart = FatSectorStart +
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((Fat32VolumeBootSector->ExtendedFlags & 0x80) ? ((Fat32VolumeBootSector->ExtendedFlags & 0x0f) * Fat32VolumeBootSector->SectorsPerFatBig) : 0);
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NumberOfFats = Fat32VolumeBootSector->NumberOfFats;
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SectorsPerFat = Fat32VolumeBootSector->SectorsPerFatBig;
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Volume->BytesPerSector = Fat32VolumeBootSector->BytesPerSector;
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Volume->SectorsPerCluster = Fat32VolumeBootSector->SectorsPerCluster;
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Volume->FatSectorStart = Fat32VolumeBootSector->ReservedSectors;
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Volume->ActiveFatSectorStart = Volume->FatSectorStart +
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((Fat32VolumeBootSector->ExtendedFlags & 0x80) ? ((Fat32VolumeBootSector->ExtendedFlags & 0x0f) * Fat32VolumeBootSector->SectorsPerFatBig) : 0);
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Volume->NumberOfFats = Fat32VolumeBootSector->NumberOfFats;
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Volume->SectorsPerFat = Fat32VolumeBootSector->SectorsPerFatBig;
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RootDirStartCluster = Fat32VolumeBootSector->RootDirStartCluster;
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DataSectorStart = FatSectorStart + NumberOfFats * SectorsPerFat;
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Volume->RootDirStartCluster = Fat32VolumeBootSector->RootDirStartCluster;
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Volume->DataSectorStart = Volume->FatSectorStart + Volume->NumberOfFats * Volume->SectorsPerFat;
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//
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// Check version
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@ -346,20 +308,6 @@ BOOLEAN FatOpenVolume(UCHAR DriveNumber, ULONGLONG VolumeStartSector, ULONGLONG
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return FALSE;
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}
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}
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MmHeapFree(FatVolumeBootSector);
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{
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GEOMETRY DriveGeometry;
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ULONG BlockSize;
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// Initialize drive by getting its geometry
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if (!MachDiskGetDriveGeometry(DriveNumber, &DriveGeometry))
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{
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return FALSE;
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}
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BlockSize = MachDiskGetCacheableBlockCount(DriveNumber);
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}
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return TRUE;
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}
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@ -419,7 +367,7 @@ ULONG FatDetermineFatType(PFAT_BOOTSECTOR FatBootSector, ULONG PartitionSectorCo
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}
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}
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PVOID FatBufferDirectory(ULONG DirectoryStartCluster, ULONG *DirectorySize, BOOLEAN RootDirectory)
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PVOID FatBufferDirectory(PFAT_VOLUME_INFO Volume, ULONG DirectoryStartCluster, ULONG *DirectorySize, BOOLEAN RootDirectory)
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{
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PVOID DirectoryBuffer;
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@ -429,9 +377,9 @@ PVOID FatBufferDirectory(ULONG DirectoryStartCluster, ULONG *DirectorySize, BOOL
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* For FAT32, the root directory is nothing special. We can treat it the same
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* as a subdirectory.
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*/
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if (RootDirectory && FAT32 == FatType)
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if (RootDirectory && Volume->FatType == FAT32)
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{
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DirectoryStartCluster = RootDirStartCluster;
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DirectoryStartCluster = Volume->RootDirStartCluster;
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RootDirectory = FALSE;
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}
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@ -440,18 +388,18 @@ PVOID FatBufferDirectory(ULONG DirectoryStartCluster, ULONG *DirectorySize, BOOL
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//
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if (RootDirectory)
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{
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*DirectorySize = RootDirSectors * BytesPerSector;
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*DirectorySize = Volume->RootDirSectors * Volume->BytesPerSector;
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}
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else
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{
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*DirectorySize = FatCountClustersInChain(DirectoryStartCluster) * SectorsPerCluster * BytesPerSector;
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*DirectorySize = FatCountClustersInChain(Volume, DirectoryStartCluster) * Volume->SectorsPerCluster * Volume->BytesPerSector;
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}
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//
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// Attempt to allocate memory for directory buffer
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//
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DPRINTM(DPRINT_FILESYSTEM, "Trying to allocate (DirectorySize) %d bytes.\n", *DirectorySize);
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DirectoryBuffer = MmHeapAlloc(*DirectorySize);
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DirectoryBuffer = MmAllocateMemory(*DirectorySize);
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if (DirectoryBuffer == NULL)
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{
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@ -463,17 +411,17 @@ PVOID FatBufferDirectory(ULONG DirectoryStartCluster, ULONG *DirectorySize, BOOL
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//
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if (RootDirectory)
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{
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if (!FatReadVolumeSectors(FatDriveNumber, RootDirSectorStart, RootDirSectors, DirectoryBuffer))
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if (!FatReadVolumeSectors(Volume, Volume->RootDirSectorStart, Volume->RootDirSectors, DirectoryBuffer))
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{
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MmHeapFree(DirectoryBuffer);
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MmFreeMemory(DirectoryBuffer);
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return NULL;
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}
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}
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else
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{
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if (!FatReadClusterChain(DirectoryStartCluster, 0xFFFFFFFF, DirectoryBuffer))
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if (!FatReadClusterChain(Volume, DirectoryStartCluster, 0xFFFFFFFF, DirectoryBuffer))
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{
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MmHeapFree(DirectoryBuffer);
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MmFreeMemory(DirectoryBuffer);
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return NULL;
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}
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}
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@ -481,7 +429,7 @@ PVOID FatBufferDirectory(ULONG DirectoryStartCluster, ULONG *DirectorySize, BOOL
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return DirectoryBuffer;
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}
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BOOLEAN FatSearchDirectoryBufferForFile(PVOID DirectoryBuffer, ULONG DirectorySize, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer)
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BOOLEAN FatSearchDirectoryBufferForFile(PFAT_VOLUME_INFO Volume, PVOID DirectoryBuffer, ULONG DirectorySize, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer)
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{
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ULONG EntryCount;
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ULONG CurrentEntry;
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@ -639,8 +587,8 @@ BOOLEAN FatSearchDirectoryBufferForFile(PVOID DirectoryBuffer, ULONG DirectorySi
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//
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FatParseShortFileName(ShortNameBuffer, DirEntry);
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DPRINTM(DPRINT_FILESYSTEM, "Entry: %d LFN = %s\n", CurrentEntry, LfnNameBuffer);
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DPRINTM(DPRINT_FILESYSTEM, "Entry: %d DOS name = %s\n", CurrentEntry, ShortNameBuffer);
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//DPRINTM(DPRINT_FILESYSTEM, "Entry: %d LFN = %s\n", CurrentEntry, LfnNameBuffer);
|
||||
//DPRINTM(DPRINT_FILESYSTEM, "Entry: %d DOS name = %s\n", CurrentEntry, ShortNameBuffer);
|
||||
|
||||
//
|
||||
// See if the file name matches either the short or long name
|
||||
|
|
@ -672,7 +620,7 @@ BOOLEAN FatSearchDirectoryBufferForFile(PVOID DirectoryBuffer, ULONG DirectorySi
|
|||
//
|
||||
StartCluster = ((ULONG)DirEntry->ClusterHigh << 16) + DirEntry->ClusterLow;
|
||||
DPRINTM(DPRINT_FILESYSTEM, "StartCluster = 0x%x\n", StartCluster);
|
||||
FatFileInfoPointer->FileFatChain = FatGetClusterChainArray(StartCluster);
|
||||
FatFileInfoPointer->FileFatChain = FatGetClusterChainArray(Volume, StartCluster);
|
||||
|
||||
//
|
||||
// See if memory allocation failed
|
||||
|
|
@ -696,7 +644,7 @@ BOOLEAN FatSearchDirectoryBufferForFile(PVOID DirectoryBuffer, ULONG DirectorySi
|
|||
return FALSE;
|
||||
}
|
||||
|
||||
static BOOLEAN FatXSearchDirectoryBufferForFile(PVOID DirectoryBuffer, ULONG DirectorySize, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer)
|
||||
static BOOLEAN FatXSearchDirectoryBufferForFile(PFAT_VOLUME_INFO Volume, PVOID DirectoryBuffer, ULONG DirectorySize, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer)
|
||||
{
|
||||
ULONG EntryCount;
|
||||
ULONG CurrentEntry;
|
||||
|
|
@ -746,7 +694,7 @@ static BOOLEAN FatXSearchDirectoryBufferForFile(PVOID DirectoryBuffer, ULONG Dir
|
|||
/*
|
||||
* Get the cluster chain
|
||||
*/
|
||||
FatFileInfoPointer->FileFatChain = FatGetClusterChainArray(DirEntry->StartCluster);
|
||||
FatFileInfoPointer->FileFatChain = FatGetClusterChainArray(Volume, DirEntry->StartCluster);
|
||||
|
||||
/*
|
||||
* See if memory allocation failed
|
||||
|
|
@ -769,7 +717,7 @@ static BOOLEAN FatXSearchDirectoryBufferForFile(PVOID DirectoryBuffer, ULONG Dir
|
|||
* specified filename and fills in an FAT_FILE_INFO structure
|
||||
* with info describing the file, etc. returns ARC error code
|
||||
*/
|
||||
LONG FatLookupFile(PCSTR FileName, ULONG DeviceId, PFAT_FILE_INFO FatFileInfoPointer)
|
||||
LONG FatLookupFile(PFAT_VOLUME_INFO Volume, PCSTR FileName, ULONG DeviceId, PFAT_FILE_INFO FatFileInfoPointer)
|
||||
{
|
||||
UINT32 i;
|
||||
ULONG NumberOfPathParts;
|
||||
|
|
@ -809,7 +757,7 @@ LONG FatLookupFile(PCSTR FileName, ULONG DeviceId, PFAT_FILE_INFO FatFileInfoPoi
|
|||
//
|
||||
// Buffer the directory contents
|
||||
//
|
||||
DirectoryBuffer = FatBufferDirectory(DirectoryStartCluster, &DirectorySize, (i == 0) );
|
||||
DirectoryBuffer = FatBufferDirectory(Volume, DirectoryStartCluster, &DirectorySize, (i == 0) );
|
||||
if (DirectoryBuffer == NULL)
|
||||
{
|
||||
return ENOMEM;
|
||||
|
|
@ -818,24 +766,24 @@ LONG FatLookupFile(PCSTR FileName, ULONG DeviceId, PFAT_FILE_INFO FatFileInfoPoi
|
|||
//
|
||||
// Search for file name in directory
|
||||
//
|
||||
if (ISFATX(FatType))
|
||||
if (ISFATX(Volume->FatType))
|
||||
{
|
||||
if (!FatXSearchDirectoryBufferForFile(DirectoryBuffer, DirectorySize, PathPart, &FatFileInfo))
|
||||
if (!FatXSearchDirectoryBufferForFile(Volume, DirectoryBuffer, DirectorySize, PathPart, &FatFileInfo))
|
||||
{
|
||||
MmHeapFree(DirectoryBuffer);
|
||||
MmFreeMemory(DirectoryBuffer);
|
||||
return ENOENT;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!FatSearchDirectoryBufferForFile(DirectoryBuffer, DirectorySize, PathPart, &FatFileInfo))
|
||||
if (!FatSearchDirectoryBufferForFile(Volume, DirectoryBuffer, DirectorySize, PathPart, &FatFileInfo))
|
||||
{
|
||||
MmHeapFree(DirectoryBuffer);
|
||||
MmFreeMemory(DirectoryBuffer);
|
||||
return ENOENT;
|
||||
}
|
||||
}
|
||||
|
||||
MmHeapFree(DirectoryBuffer);
|
||||
MmFreeMemory(DirectoryBuffer);
|
||||
|
||||
//
|
||||
// If we have another sub-directory to go then
|
||||
|
|
@ -844,8 +792,8 @@ LONG FatLookupFile(PCSTR FileName, ULONG DeviceId, PFAT_FILE_INFO FatFileInfoPoi
|
|||
if ((i+1) < NumberOfPathParts)
|
||||
{
|
||||
DirectoryStartCluster = FatFileInfo.FileFatChain[0];
|
||||
MmHeapFree(FatFileInfo.FileFatChain);
|
||||
}
|
||||
MmFreeMemory(FatFileInfo.FileFatChain);
|
||||
}
|
||||
|
||||
memcpy(FatFileInfoPointer, &FatFileInfo, sizeof(FAT_FILE_INFO));
|
||||
|
|
@ -899,44 +847,44 @@ void FatParseShortFileName(PCHAR Buffer, PDIRENTRY DirEntry)
|
|||
Buffer[Idx++] = (DirEntry->FileName[10] == ' ') ? '\0' : DirEntry->FileName[10];
|
||||
}
|
||||
|
||||
DPRINTM(DPRINT_FILESYSTEM, "FatParseShortFileName() ShortName = %s\n", Buffer);
|
||||
//DPRINTM(DPRINT_FILESYSTEM, "FatParseShortFileName() ShortName = %s\n", Buffer);
|
||||
}
|
||||
|
||||
/*
|
||||
* FatGetFatEntry()
|
||||
* returns the Fat entry for a given cluster number
|
||||
*/
|
||||
BOOLEAN FatGetFatEntry(ULONG Cluster, ULONG* ClusterPointer)
|
||||
BOOLEAN FatGetFatEntry(PFAT_VOLUME_INFO Volume, ULONG Cluster, ULONG* ClusterPointer)
|
||||
{
|
||||
ULONG fat = 0;
|
||||
UINT32 FatOffset;
|
||||
UINT32 ThisFatSecNum;
|
||||
UINT32 ThisFatEntOffset;
|
||||
|
||||
DPRINTM(DPRINT_FILESYSTEM, "FatGetFatEntry() Retrieving FAT entry for cluster %d.\n", Cluster);
|
||||
//DPRINTM(DPRINT_FILESYSTEM, "FatGetFatEntry() Retrieving FAT entry for cluster %d.\n", Cluster);
|
||||
|
||||
switch(FatType)
|
||||
switch(Volume->FatType)
|
||||
{
|
||||
case FAT12:
|
||||
|
||||
FatOffset = Cluster + (Cluster / 2);
|
||||
ThisFatSecNum = ActiveFatSectorStart + (FatOffset / BytesPerSector);
|
||||
ThisFatEntOffset = (FatOffset % BytesPerSector);
|
||||
ThisFatSecNum = Volume->ActiveFatSectorStart + (FatOffset / Volume->BytesPerSector);
|
||||
ThisFatEntOffset = (FatOffset % Volume->BytesPerSector);
|
||||
|
||||
DPRINTM(DPRINT_FILESYSTEM, "FatOffset: %d\n", FatOffset);
|
||||
DPRINTM(DPRINT_FILESYSTEM, "ThisFatSecNum: %d\n", ThisFatSecNum);
|
||||
DPRINTM(DPRINT_FILESYSTEM, "ThisFatEntOffset: %d\n", ThisFatEntOffset);
|
||||
|
||||
if (ThisFatEntOffset == (BytesPerSector - 1))
|
||||
if (ThisFatEntOffset == (Volume->BytesPerSector - 1))
|
||||
{
|
||||
if (!FatReadVolumeSectors(FatDriveNumber, ThisFatSecNum, 2, (PVOID)FILESYSBUFFER))
|
||||
if (!FatReadVolumeSectors(Volume, ThisFatSecNum, 2, (PVOID)FILESYSBUFFER))
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!FatReadVolumeSectors(FatDriveNumber, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER))
|
||||
if (!FatReadVolumeSectors(Volume, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER))
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
|
@ -955,10 +903,10 @@ BOOLEAN FatGetFatEntry(ULONG Cluster, ULONG* ClusterPointer)
|
|||
case FATX16:
|
||||
|
||||
FatOffset = (Cluster * 2);
|
||||
ThisFatSecNum = ActiveFatSectorStart + (FatOffset / BytesPerSector);
|
||||
ThisFatEntOffset = (FatOffset % BytesPerSector);
|
||||
ThisFatSecNum = Volume->ActiveFatSectorStart + (FatOffset / Volume->BytesPerSector);
|
||||
ThisFatEntOffset = (FatOffset % Volume->BytesPerSector);
|
||||
|
||||
if (!FatReadVolumeSectors(FatDriveNumber, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER))
|
||||
if (!FatReadVolumeSectors(Volume, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER))
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
|
@ -972,10 +920,10 @@ BOOLEAN FatGetFatEntry(ULONG Cluster, ULONG* ClusterPointer)
|
|||
case FATX32:
|
||||
|
||||
FatOffset = (Cluster * 4);
|
||||
ThisFatSecNum = ActiveFatSectorStart + (FatOffset / BytesPerSector);
|
||||
ThisFatEntOffset = (FatOffset % BytesPerSector);
|
||||
ThisFatSecNum = Volume->ActiveFatSectorStart + (FatOffset / Volume->BytesPerSector);
|
||||
ThisFatEntOffset = (FatOffset % Volume->BytesPerSector);
|
||||
|
||||
if (!FatReadVolumeSectors(FatDriveNumber, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER))
|
||||
if (!FatReadVolumeSectors(Volume, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER))
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
|
@ -986,16 +934,20 @@ BOOLEAN FatGetFatEntry(ULONG Cluster, ULONG* ClusterPointer)
|
|||
|
||||
break;
|
||||
|
||||
default:
|
||||
DPRINTM(DPRINT_FILESYSTEM, "Unknown FAT type %d\n", Volume->FatType);
|
||||
return FALSE;
|
||||
|
||||
}
|
||||
|
||||
DPRINTM(DPRINT_FILESYSTEM, "FAT entry is 0x%x.\n", fat);
|
||||
//DPRINTM(DPRINT_FILESYSTEM, "FAT entry is 0x%x.\n", fat);
|
||||
|
||||
*ClusterPointer = fat;
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
ULONG FatCountClustersInChain(ULONG StartCluster)
|
||||
ULONG FatCountClustersInChain(PFAT_VOLUME_INFO Volume, ULONG StartCluster)
|
||||
{
|
||||
ULONG ClusterCount = 0;
|
||||
|
||||
|
|
@ -1006,9 +958,9 @@ ULONG FatCountClustersInChain(ULONG StartCluster)
|
|||
//
|
||||
// If end of chain then break out of our cluster counting loop
|
||||
//
|
||||
if (((FatType == FAT12) && (StartCluster >= 0xff8)) ||
|
||||
((FatType == FAT16 || FatType == FATX16) && (StartCluster >= 0xfff8)) ||
|
||||
((FatType == FAT32 || FatType == FATX32) && (StartCluster >= 0x0ffffff8)))
|
||||
if (((Volume->FatType == FAT12) && (StartCluster >= 0xff8)) ||
|
||||
((Volume->FatType == FAT16 || Volume->FatType == FATX16) && (StartCluster >= 0xfff8)) ||
|
||||
((Volume->FatType == FAT32 || Volume->FatType == FATX32) && (StartCluster >= 0x0ffffff8)))
|
||||
{
|
||||
break;
|
||||
}
|
||||
|
|
@ -1021,7 +973,7 @@ ULONG FatCountClustersInChain(ULONG StartCluster)
|
|||
//
|
||||
// Get next cluster
|
||||
//
|
||||
if (!FatGetFatEntry(StartCluster, &StartCluster))
|
||||
if (!FatGetFatEntry(Volume, StartCluster, &StartCluster))
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1032,7 +984,7 @@ ULONG FatCountClustersInChain(ULONG StartCluster)
|
|||
return ClusterCount;
|
||||
}
|
||||
|
||||
ULONG* FatGetClusterChainArray(ULONG StartCluster)
|
||||
ULONG* FatGetClusterChainArray(PFAT_VOLUME_INFO Volume, ULONG StartCluster)
|
||||
{
|
||||
ULONG ClusterCount;
|
||||
ULONG ArraySize;
|
||||
|
|
@ -1041,13 +993,13 @@ ULONG* FatGetClusterChainArray(ULONG StartCluster)
|
|||
|
||||
DPRINTM(DPRINT_FILESYSTEM, "FatGetClusterChainArray() StartCluster = %d\n", StartCluster);
|
||||
|
||||
ClusterCount = FatCountClustersInChain(StartCluster) + 1; // Lets get the 0x0ffffff8 on the end of the array
|
||||
ClusterCount = FatCountClustersInChain(Volume, StartCluster) + 1; // Lets get the 0x0ffffff8 on the end of the array
|
||||
ArraySize = ClusterCount * sizeof(ULONG);
|
||||
|
||||
//
|
||||
// Allocate array memory
|
||||
//
|
||||
ArrayPointer = MmHeapAlloc(ArraySize);
|
||||
ArrayPointer = MmAllocateMemory(ArraySize);
|
||||
|
||||
if (ArrayPointer == NULL)
|
||||
{
|
||||
|
|
@ -1067,9 +1019,9 @@ ULONG* FatGetClusterChainArray(ULONG StartCluster)
|
|||
//
|
||||
// Don't try to get next cluster for last cluster
|
||||
//
|
||||
if (((FatType == FAT12) && (StartCluster >= 0xff8)) ||
|
||||
((FatType == FAT16 || FatType == FATX16) && (StartCluster >= 0xfff8)) ||
|
||||
((FatType == FAT32 || FatType == FATX32) && (StartCluster >= 0x0ffffff8)))
|
||||
if (((Volume->FatType == FAT12) && (StartCluster >= 0xff8)) ||
|
||||
((Volume->FatType == FAT16 || Volume->FatType == FATX16) && (StartCluster >= 0xfff8)) ||
|
||||
((Volume->FatType == FAT32 || Volume->FatType == FATX32) && (StartCluster >= 0x0ffffff8)))
|
||||
{
|
||||
Idx++;
|
||||
break;
|
||||
|
|
@ -1078,9 +1030,9 @@ ULONG* FatGetClusterChainArray(ULONG StartCluster)
|
|||
//
|
||||
// Get next cluster
|
||||
//
|
||||
if (!FatGetFatEntry(StartCluster, &StartCluster))
|
||||
if (!FatGetFatEntry(Volume, StartCluster, &StartCluster))
|
||||
{
|
||||
MmHeapFree(ArrayPointer);
|
||||
MmFreeMemory(ArrayPointer);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
|
@ -1088,33 +1040,11 @@ ULONG* FatGetClusterChainArray(ULONG StartCluster)
|
|||
return ArrayPointer;
|
||||
}
|
||||
|
||||
/*
|
||||
* FatReadCluster()
|
||||
* Reads the specified cluster into memory
|
||||
*/
|
||||
BOOLEAN FatReadCluster(ULONG ClusterNumber, PVOID Buffer)
|
||||
{
|
||||
ULONG ClusterStartSector;
|
||||
|
||||
ClusterStartSector = ((ClusterNumber - 2) * SectorsPerCluster) + DataSectorStart;
|
||||
|
||||
DPRINTM(DPRINT_FILESYSTEM, "FatReadCluster() ClusterNumber = %d Buffer = 0x%x ClusterStartSector = %d\n", ClusterNumber, Buffer, ClusterStartSector);
|
||||
|
||||
if (!FatReadVolumeSectors(FatDriveNumber, ClusterStartSector, SectorsPerCluster, (PVOID)FILESYSBUFFER))
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
memcpy(Buffer, (PVOID)FILESYSBUFFER, SectorsPerCluster * BytesPerSector);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
/*
|
||||
* FatReadClusterChain()
|
||||
* Reads the specified clusters into memory
|
||||
*/
|
||||
BOOLEAN FatReadClusterChain(ULONG StartClusterNumber, ULONG NumberOfClusters, PVOID Buffer)
|
||||
BOOLEAN FatReadClusterChain(PFAT_VOLUME_INFO Volume, ULONG StartClusterNumber, ULONG NumberOfClusters, PVOID Buffer)
|
||||
{
|
||||
ULONG ClusterStartSector;
|
||||
|
||||
|
|
@ -1123,21 +1053,21 @@ BOOLEAN FatReadClusterChain(ULONG StartClusterNumber, ULONG NumberOfClusters, PV
|
|||
while (NumberOfClusters > 0)
|
||||
{
|
||||
|
||||
DPRINTM(DPRINT_FILESYSTEM, "FatReadClusterChain() StartClusterNumber = %d NumberOfClusters = %d Buffer = 0x%x\n", StartClusterNumber, NumberOfClusters, Buffer);
|
||||
//DPRINTM(DPRINT_FILESYSTEM, "FatReadClusterChain() StartClusterNumber = %d NumberOfClusters = %d Buffer = 0x%x\n", StartClusterNumber, NumberOfClusters, Buffer);
|
||||
//
|
||||
// Calculate starting sector for cluster
|
||||
//
|
||||
ClusterStartSector = ((StartClusterNumber - 2) * SectorsPerCluster) + DataSectorStart;
|
||||
ClusterStartSector = ((StartClusterNumber - 2) * Volume->SectorsPerCluster) + Volume->DataSectorStart;
|
||||
|
||||
//
|
||||
// Read cluster into memory
|
||||
//
|
||||
if (!FatReadVolumeSectors(FatDriveNumber, ClusterStartSector, SectorsPerCluster, (PVOID)FILESYSBUFFER))
|
||||
if (!FatReadVolumeSectors(Volume, ClusterStartSector, Volume->SectorsPerCluster, (PVOID)FILESYSBUFFER))
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
memcpy(Buffer, (PVOID)FILESYSBUFFER, SectorsPerCluster * BytesPerSector);
|
||||
memcpy(Buffer, (PVOID)FILESYSBUFFER, Volume->SectorsPerCluster * Volume->BytesPerSector);
|
||||
|
||||
//
|
||||
// Decrement count of clusters left to read
|
||||
|
|
@ -1147,12 +1077,12 @@ BOOLEAN FatReadClusterChain(ULONG StartClusterNumber, ULONG NumberOfClusters, PV
|
|||
//
|
||||
// Increment buffer address by cluster size
|
||||
//
|
||||
Buffer = (PVOID)((ULONG_PTR)Buffer + (SectorsPerCluster * BytesPerSector));
|
||||
Buffer = (PVOID)((ULONG_PTR)Buffer + (Volume->SectorsPerCluster * Volume->BytesPerSector));
|
||||
|
||||
//
|
||||
// Get next cluster
|
||||
//
|
||||
if (!FatGetFatEntry(StartClusterNumber, &StartClusterNumber))
|
||||
if (!FatGetFatEntry(Volume, StartClusterNumber, &StartClusterNumber))
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
|
@ -1160,9 +1090,9 @@ BOOLEAN FatReadClusterChain(ULONG StartClusterNumber, ULONG NumberOfClusters, PV
|
|||
//
|
||||
// If end of chain then break out of our cluster reading loop
|
||||
//
|
||||
if (((FatType == FAT12) && (StartClusterNumber >= 0xff8)) ||
|
||||
((FatType == FAT16 || FatType == FATX16) && (StartClusterNumber >= 0xfff8)) ||
|
||||
((FatType == FAT32 || FatType == FATX32) && (StartClusterNumber >= 0x0ffffff8)))
|
||||
if (((Volume->FatType == FAT12) && (StartClusterNumber >= 0xff8)) ||
|
||||
((Volume->FatType == FAT16 || Volume->FatType == FATX16) && (StartClusterNumber >= 0xfff8)) ||
|
||||
((Volume->FatType == FAT32 || Volume->FatType == FATX32) && (StartClusterNumber >= 0x0ffffff8)))
|
||||
{
|
||||
break;
|
||||
}
|
||||
|
|
@ -1175,15 +1105,15 @@ BOOLEAN FatReadClusterChain(ULONG StartClusterNumber, ULONG NumberOfClusters, PV
|
|||
* FatReadPartialCluster()
|
||||
* Reads part of a cluster into memory
|
||||
*/
|
||||
BOOLEAN FatReadPartialCluster(ULONG ClusterNumber, ULONG StartingOffset, ULONG Length, PVOID Buffer)
|
||||
BOOLEAN FatReadPartialCluster(PFAT_VOLUME_INFO Volume, ULONG ClusterNumber, ULONG StartingOffset, ULONG Length, PVOID Buffer)
|
||||
{
|
||||
ULONG ClusterStartSector;
|
||||
|
||||
DPRINTM(DPRINT_FILESYSTEM, "FatReadPartialCluster() ClusterNumber = %d StartingOffset = %d Length = %d Buffer = 0x%x\n", ClusterNumber, StartingOffset, Length, Buffer);
|
||||
//DPRINTM(DPRINT_FILESYSTEM, "FatReadPartialCluster() ClusterNumber = %d StartingOffset = %d Length = %d Buffer = 0x%x\n", ClusterNumber, StartingOffset, Length, Buffer);
|
||||
|
||||
ClusterStartSector = ((ClusterNumber - 2) * SectorsPerCluster) + DataSectorStart;
|
||||
ClusterStartSector = ((ClusterNumber - 2) * Volume->SectorsPerCluster) + Volume->DataSectorStart;
|
||||
|
||||
if (!FatReadVolumeSectors(FatDriveNumber, ClusterStartSector, SectorsPerCluster, (PVOID)FILESYSBUFFER))
|
||||
if (!FatReadVolumeSectors(Volume, ClusterStartSector, Volume->SectorsPerCluster, (PVOID)FILESYSBUFFER))
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
|
@ -1200,6 +1130,7 @@ BOOLEAN FatReadPartialCluster(ULONG ClusterNumber, ULONG StartingOffset, ULONG L
|
|||
*/
|
||||
BOOLEAN FatReadFile(PFAT_FILE_INFO FatFileInfo, ULONG BytesToRead, ULONG* BytesRead, PVOID Buffer)
|
||||
{
|
||||
PFAT_VOLUME_INFO Volume = FatFileInfo->Volume;
|
||||
ULONG ClusterNumber;
|
||||
ULONG OffsetInCluster;
|
||||
ULONG LengthInCluster;
|
||||
|
|
@ -1260,7 +1191,7 @@ BOOLEAN FatReadFile(PFAT_FILE_INFO FatFileInfo, ULONG BytesToRead, ULONG* BytesR
|
|||
// the last cluster.
|
||||
//
|
||||
|
||||
BytesPerCluster = SectorsPerCluster * BytesPerSector;
|
||||
BytesPerCluster = Volume->SectorsPerCluster * Volume->BytesPerSector;
|
||||
|
||||
//
|
||||
// Only do the first read if we
|
||||
|
|
@ -1279,7 +1210,7 @@ BOOLEAN FatReadFile(PFAT_FILE_INFO FatFileInfo, ULONG BytesToRead, ULONG* BytesR
|
|||
//
|
||||
// Now do the read and update BytesRead, BytesToRead, FilePointer, & Buffer
|
||||
//
|
||||
if (!FatReadPartialCluster(ClusterNumber, OffsetInCluster, LengthInCluster, Buffer))
|
||||
if (!FatReadPartialCluster(Volume, ClusterNumber, OffsetInCluster, LengthInCluster, Buffer))
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
|
@ -1310,7 +1241,7 @@ BOOLEAN FatReadFile(PFAT_FILE_INFO FatFileInfo, ULONG BytesToRead, ULONG* BytesR
|
|||
//
|
||||
// Now do the read and update BytesRead, BytesToRead, FilePointer, & Buffer
|
||||
//
|
||||
if (!FatReadClusterChain(ClusterNumber, NumberOfClusters, Buffer))
|
||||
if (!FatReadClusterChain(Volume, ClusterNumber, NumberOfClusters, Buffer))
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
|
@ -1335,7 +1266,7 @@ BOOLEAN FatReadFile(PFAT_FILE_INFO FatFileInfo, ULONG BytesToRead, ULONG* BytesR
|
|||
//
|
||||
// Now do the read and update BytesRead, BytesToRead, FilePointer, & Buffer
|
||||
//
|
||||
if (!FatReadPartialCluster(ClusterNumber, 0, BytesToRead, Buffer))
|
||||
if (!FatReadPartialCluster(Volume, ClusterNumber, 0, BytesToRead, Buffer))
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
|
@ -1351,16 +1282,35 @@ BOOLEAN FatReadFile(PFAT_FILE_INFO FatFileInfo, ULONG BytesToRead, ULONG* BytesR
|
|||
return TRUE;
|
||||
}
|
||||
|
||||
BOOLEAN FatReadVolumeSectors(ULONG DriveNumber, ULONG SectorNumber, ULONG SectorCount, PVOID Buffer)
|
||||
BOOLEAN FatReadVolumeSectors(PFAT_VOLUME_INFO Volume, ULONG SectorNumber, ULONG SectorCount, PVOID Buffer)
|
||||
{
|
||||
// Now try to read in the block
|
||||
if (!MachDiskReadLogicalSectors(DriveNumber, SectorNumber + FatVolumeStartSector, SectorCount, (PVOID)DISKREADBUFFER))
|
||||
LARGE_INTEGER Position;
|
||||
ULONG Count;
|
||||
LONG ret;
|
||||
|
||||
//DPRINTM(DPRINT_FILESYSTEM, "FatReadVolumeSectors(): SectorNumber %d, SectorCount %d, Buffer %p\n",
|
||||
// SectorNumber, SectorCount, Buffer);
|
||||
|
||||
//
|
||||
// Seek to right position
|
||||
//
|
||||
Position.QuadPart = SectorNumber * 512;
|
||||
ret = ArcSeek(Volume->DeviceId, &Position, SeekAbsolute);
|
||||
if (ret != ESUCCESS)
|
||||
{
|
||||
DPRINTM(DPRINT_FILESYSTEM, "FatReadVolumeSectors() Failed to seek\n");
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
// Copy data to the caller
|
||||
RtlCopyMemory(Buffer, (PVOID)DISKREADBUFFER, SectorCount * BytesPerSector);
|
||||
//
|
||||
// Read data
|
||||
//
|
||||
ret = ArcRead(Volume->DeviceId, Buffer, SectorCount * 512, &Count);
|
||||
if (ret != ESUCCESS || Count != SectorCount * 512)
|
||||
{
|
||||
DPRINTM(DPRINT_FILESYSTEM, "FatReadVolumeSectors() Failed to read\n");
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
// Return success
|
||||
return TRUE;
|
||||
|
|
@ -1393,6 +1343,7 @@ LONG FatGetFileInformation(ULONG FileId, FILEINFORMATION* Information)
|
|||
|
||||
LONG FatOpen(CHAR* Path, OPENMODE OpenMode, ULONG* FileId)
|
||||
{
|
||||
PFAT_VOLUME_INFO FatVolume;
|
||||
FAT_FILE_INFO TempFileInfo;
|
||||
PFAT_FILE_INFO FileHandle;
|
||||
ULONG DeviceId;
|
||||
|
|
@ -1402,11 +1353,12 @@ LONG FatOpen(CHAR* Path, OPENMODE OpenMode, ULONG* FileId)
|
|||
return EACCES;
|
||||
|
||||
DeviceId = FsGetDeviceId(*FileId);
|
||||
FatVolume = FatVolumes[DeviceId];
|
||||
|
||||
DPRINTM(DPRINT_FILESYSTEM, "FatOpen() FileName = %s\n", Path);
|
||||
|
||||
RtlZeroMemory(&TempFileInfo, sizeof(TempFileInfo));
|
||||
ret = FatLookupFile(Path, DeviceId, &TempFileInfo);
|
||||
ret = FatLookupFile(FatVolume, Path, DeviceId, &TempFileInfo);
|
||||
if (ret != ESUCCESS)
|
||||
return ENOENT;
|
||||
|
||||
|
|
@ -1415,6 +1367,7 @@ LONG FatOpen(CHAR* Path, OPENMODE OpenMode, ULONG* FileId)
|
|||
return ENOMEM;
|
||||
|
||||
RtlCopyMemory(FileHandle, &TempFileInfo, sizeof(FAT_FILE_INFO));
|
||||
FileHandle->Volume = FatVolume;
|
||||
|
||||
FsSetDeviceSpecific(*FileId, FileHandle);
|
||||
return ESUCCESS;
|
||||
|
|
@ -1468,14 +1421,25 @@ const DEVVTBL FatFuncTable =
|
|||
|
||||
const DEVVTBL* FatMount(ULONG DeviceId)
|
||||
{
|
||||
PFAT_VOLUME_INFO Volume;
|
||||
UCHAR Buffer[512];
|
||||
PFAT_BOOTSECTOR BootSector = (PFAT_BOOTSECTOR)Buffer;
|
||||
PFAT32_BOOTSECTOR BootSector32 = (PFAT32_BOOTSECTOR)Buffer;
|
||||
PFATX_BOOTSECTOR BootSectorX = (PFATX_BOOTSECTOR)Buffer;
|
||||
FILEINFORMATION FileInformation;
|
||||
LARGE_INTEGER Position;
|
||||
ULONG Count;
|
||||
ULARGE_INTEGER SectorCount;
|
||||
LONG ret;
|
||||
|
||||
//
|
||||
// Allocate data for volume information
|
||||
//
|
||||
Volume = MmHeapAlloc(sizeof(FAT_VOLUME_INFO));
|
||||
if (!Volume)
|
||||
return NULL;
|
||||
RtlZeroMemory(Volume, sizeof(FAT_VOLUME_INFO));
|
||||
|
||||
//
|
||||
// Read the BootSector
|
||||
//
|
||||
|
|
@ -1483,31 +1447,63 @@ const DEVVTBL* FatMount(ULONG DeviceId)
|
|||
Position.LowPart = 0;
|
||||
ret = ArcSeek(DeviceId, &Position, SeekAbsolute);
|
||||
if (ret != ESUCCESS)
|
||||
{
|
||||
MmHeapFree(Volume);
|
||||
return NULL;
|
||||
}
|
||||
ret = ArcRead(DeviceId, Buffer, sizeof(Buffer), &Count);
|
||||
if (ret != ESUCCESS || Count != sizeof(Buffer))
|
||||
{
|
||||
MmHeapFree(Volume);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
//
|
||||
// Check if BootSector is valid. If yes, return FAT function table
|
||||
// Check if BootSector is valid. If no, return early
|
||||
//
|
||||
if (RtlEqualMemory(BootSector->FileSystemType, "FAT12 ", 8) ||
|
||||
RtlEqualMemory(BootSector->FileSystemType, "FAT16 ", 8) ||
|
||||
RtlEqualMemory(BootSector32->FileSystemType, "FAT32 ", 8) ||
|
||||
RtlEqualMemory(BootSectorX->FileSystemType, "FATX", 4))
|
||||
if (!RtlEqualMemory(BootSector->FileSystemType, "FAT12 ", 8) &&
|
||||
!RtlEqualMemory(BootSector->FileSystemType, "FAT16 ", 8) &&
|
||||
!RtlEqualMemory(BootSector32->FileSystemType, "FAT32 ", 8) &&
|
||||
!RtlEqualMemory(BootSectorX->FileSystemType, "FATX", 4))
|
||||
{
|
||||
//
|
||||
// Compatibility hack as long as FS is not using underlying device DeviceId
|
||||
//
|
||||
ULONG DriveNumber;
|
||||
ULONGLONG StartSector;
|
||||
ULONGLONG SectorCount;
|
||||
int Type;
|
||||
if (!DiskGetBootVolume(&DriveNumber, &StartSector, &SectorCount, &Type))
|
||||
return NULL;
|
||||
FatOpenVolume(DriveNumber, StartSector, SectorCount);
|
||||
return &FatFuncTable;
|
||||
}
|
||||
else
|
||||
MmHeapFree(Volume);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
//
|
||||
// Determine sector count
|
||||
//
|
||||
ret = ArcGetFileInformation(DeviceId, &FileInformation);
|
||||
if (ret != ESUCCESS)
|
||||
{
|
||||
MmHeapFree(Volume);
|
||||
return NULL;
|
||||
}
|
||||
SectorCount.HighPart = FileInformation.EndingAddress.HighPart;
|
||||
SectorCount.LowPart = FileInformation.EndingAddress.LowPart;
|
||||
SectorCount.QuadPart /= SECTOR_SIZE;
|
||||
|
||||
//
|
||||
// Keep device id
|
||||
//
|
||||
Volume->DeviceId = DeviceId;
|
||||
|
||||
//
|
||||
// Really open the volume
|
||||
//
|
||||
if (!FatOpenVolume(Volume, BootSector, SectorCount.QuadPart))
|
||||
{
|
||||
MmHeapFree(Volume);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
//
|
||||
// Remember FAT volume information
|
||||
//
|
||||
FatVolumes[DeviceId] = Volume;
|
||||
|
||||
//
|
||||
// Return success
|
||||
//
|
||||
return &FatFuncTable;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -144,12 +144,15 @@ typedef struct
|
|||
} FATX_DIRENTRY, * PFATX_DIRENTRY;
|
||||
#include <poppack.h>
|
||||
|
||||
typedef struct _FAT_VOLUME_INFO *PFAT_VOLUME_INFO;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
ULONG FileSize; /* File size */
|
||||
ULONG FilePointer; /* File pointer */
|
||||
ULONG* FileFatChain; /* File fat chain array */
|
||||
ULONG DriveNumber;
|
||||
PFAT_VOLUME_INFO Volume;
|
||||
} FAT_FILE_INFO, * PFAT_FILE_INFO;
|
||||
|
||||
#define ATTR_NORMAL 0x00
|
||||
|
|
|
|||
Loading…
Reference in a new issue