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https://github.com/reactos/reactos.git
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405 lines
12 KiB
C
405 lines
12 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS VFAT filesystem library
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* FILE: fat12.c
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* PURPOSE: Fat12 support
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* PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
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* Eric Kohl
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* REVISIONS:
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* EK 05/04-2003 Created
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*/
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#include "vfatlib.h"
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#define NDEBUG
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#include <debug.h>
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static ULONG
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GetShiftCount(IN ULONG Value)
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{
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ULONG i = 1;
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while (Value > 0)
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{
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i++;
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Value /= 2;
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}
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return i - 2;
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}
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static ULONG
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CalcVolumeSerialNumber(VOID)
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{
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LARGE_INTEGER SystemTime;
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TIME_FIELDS TimeFields;
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ULONG Serial;
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PUCHAR Buffer;
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NtQuerySystemTime(&SystemTime);
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RtlTimeToTimeFields(&SystemTime, &TimeFields);
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Buffer = (PUCHAR)&Serial;
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Buffer[0] = (UCHAR)(TimeFields.Year & 0xFF) + (UCHAR)(TimeFields.Hour & 0xFF);
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Buffer[1] = (UCHAR)(TimeFields.Year >> 8) + (UCHAR)(TimeFields.Minute & 0xFF);
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Buffer[2] = (UCHAR)(TimeFields.Month & 0xFF) + (UCHAR)(TimeFields.Second & 0xFF);
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Buffer[3] = (UCHAR)(TimeFields.Day & 0xFF) + (UCHAR)(TimeFields.Milliseconds & 0xFF);
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return Serial;
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}
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static NTSTATUS
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Fat12WriteBootSector(IN HANDLE FileHandle,
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IN PFAT16_BOOT_SECTOR BootSector,
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IN OUT PFORMAT_CONTEXT Context)
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{
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status;
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PFAT16_BOOT_SECTOR NewBootSector;
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LARGE_INTEGER FileOffset;
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/* Allocate buffer for new bootsector */
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NewBootSector = (PFAT16_BOOT_SECTOR)RtlAllocateHeap(RtlGetProcessHeap (),
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0,
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BootSector->BytesPerSector);
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if (NewBootSector == NULL)
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return STATUS_INSUFFICIENT_RESOURCES;
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/* Zero the new bootsector */
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memset(NewBootSector, 0, BootSector->BytesPerSector);
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/* Copy FAT16 BPB to new bootsector */
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memcpy(&NewBootSector->OEMName[0],
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&BootSector->OEMName[0],
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FIELD_OFFSET(FAT16_BOOT_SECTOR, Res2) - FIELD_OFFSET(FAT16_BOOT_SECTOR, OEMName)); /* FAT16 BPB length (up to (not including) Res2) */
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/* Write the boot sector signature */
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NewBootSector->Signature1 = 0xAA550000;
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/* Write sector 0 */
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FileOffset.QuadPart = 0ULL;
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Status = NtWriteFile(FileHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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NewBootSector,
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BootSector->BytesPerSector,
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&FileOffset,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
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RtlFreeHeap(RtlGetProcessHeap(), 0, NewBootSector);
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return Status;
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}
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/* Free the new boot sector */
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RtlFreeHeap(RtlGetProcessHeap(), 0, NewBootSector);
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UpdateProgress(Context, 1);
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return Status;
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}
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static NTSTATUS
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Fat12WriteFAT(IN HANDLE FileHandle,
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IN ULONG SectorOffset,
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IN PFAT16_BOOT_SECTOR BootSector,
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IN OUT PFORMAT_CONTEXT Context)
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{
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status;
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PUCHAR Buffer;
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LARGE_INTEGER FileOffset;
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ULONG i;
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ULONG Size;
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ULONG Sectors;
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/* Allocate buffer */
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Buffer = (PUCHAR)RtlAllocateHeap(RtlGetProcessHeap(),
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0,
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32 * 1024);
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if (Buffer == NULL)
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return STATUS_INSUFFICIENT_RESOURCES;
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/* Zero the buffer */
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memset(Buffer, 0, 32 * 1024);
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/* FAT cluster 0 & 1*/
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Buffer[0] = 0xf8; /* Media type */
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Buffer[1] = 0xff;
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Buffer[2] = 0xff;
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/* Write first sector of the FAT */
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FileOffset.QuadPart = (SectorOffset + BootSector->ReservedSectors) * BootSector->BytesPerSector;
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Status = NtWriteFile(FileHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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Buffer,
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BootSector->BytesPerSector,
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&FileOffset,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
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RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
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return Status;
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}
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UpdateProgress(Context, 1);
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/* Zero the begin of the buffer */
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memset(Buffer, 0, 3);
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/* Zero the rest of the FAT */
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Sectors = 32 * 1024 / BootSector->BytesPerSector;
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for (i = 1; i < (ULONG)BootSector->FATSectors; i += Sectors)
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{
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/* Zero some sectors of the FAT */
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FileOffset.QuadPart = (SectorOffset + BootSector->ReservedSectors + i) * BootSector->BytesPerSector;
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if (((ULONG)BootSector->FATSectors - i) <= Sectors)
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{
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Sectors = (ULONG)BootSector->FATSectors - i;
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}
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Size = Sectors * BootSector->BytesPerSector;
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Status = NtWriteFile(FileHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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Buffer,
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Size,
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&FileOffset,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
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RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
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return Status;
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}
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UpdateProgress(Context, Sectors);
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}
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/* Free the buffer */
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RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
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return Status;
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}
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static NTSTATUS
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Fat12WriteRootDirectory(IN HANDLE FileHandle,
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IN PFAT16_BOOT_SECTOR BootSector,
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IN OUT PFORMAT_CONTEXT Context)
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{
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status = STATUS_SUCCESS;
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PUCHAR Buffer;
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LARGE_INTEGER FileOffset;
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ULONG FirstRootDirSector;
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ULONG RootDirSectors;
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ULONG Sectors;
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ULONG Size;
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ULONG i;
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DPRINT("BootSector->ReservedSectors = %hu\n", BootSector->ReservedSectors);
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DPRINT("BootSector->FATSectors = %hu\n", BootSector->FATSectors);
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DPRINT("BootSector->SectorsPerCluster = %u\n", BootSector->SectorsPerCluster);
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/* Write cluster */
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RootDirSectors = ((BootSector->RootEntries * 32) +
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(BootSector->BytesPerSector - 1)) / BootSector->BytesPerSector;
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FirstRootDirSector =
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BootSector->ReservedSectors + (BootSector->FATCount * BootSector->FATSectors);
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DPRINT("RootDirSectors = %lu\n", RootDirSectors);
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DPRINT("FirstRootDirSector = %lu\n", FirstRootDirSector);
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/* Allocate buffer for the cluster */
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Buffer = (PUCHAR)RtlAllocateHeap(RtlGetProcessHeap(),
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0,
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32 * 1024);
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if (Buffer == NULL)
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return STATUS_INSUFFICIENT_RESOURCES;
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/* Zero the buffer */
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memset(Buffer, 0, 32 * 1024);
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Sectors = 32 * 1024 / BootSector->BytesPerSector;
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for (i = 0; i < RootDirSectors; i += Sectors)
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{
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/* Zero some sectors of the root directory */
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FileOffset.QuadPart = (FirstRootDirSector + i) * BootSector->BytesPerSector;
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if ((RootDirSectors - i) <= Sectors)
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{
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Sectors = RootDirSectors - i;
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}
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Size = Sectors * BootSector->BytesPerSector;
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Status = NtWriteFile(FileHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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Buffer,
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Size,
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&FileOffset,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
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RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
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return Status;
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}
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UpdateProgress(Context, Sectors);
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}
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/* Free the buffer */
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RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
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return Status;
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}
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NTSTATUS
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Fat12Format(IN HANDLE FileHandle,
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IN PPARTITION_INFORMATION PartitionInfo,
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IN PDISK_GEOMETRY DiskGeometry,
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IN PUNICODE_STRING Label,
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IN BOOLEAN QuickFormat,
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IN ULONG ClusterSize,
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IN OUT PFORMAT_CONTEXT Context)
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{
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FAT16_BOOT_SECTOR BootSector;
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OEM_STRING VolumeLabel;
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ULONG SectorCount;
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ULONG RootDirSectors;
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ULONG TmpVal1;
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ULONG TmpVal2;
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ULONG TmpVal3;
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NTSTATUS Status;
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/* Calculate cluster size */
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if (ClusterSize == 0)
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{
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if (DiskGeometry->MediaType == FixedMedia)
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{
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/* 4KB Cluster (Harddisk only) */
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ClusterSize = 4096;
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}
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else
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{
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/* 512 byte cluster (floppy) */
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ClusterSize = 512;
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}
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}
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SectorCount = PartitionInfo->PartitionLength.QuadPart >>
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GetShiftCount(DiskGeometry->BytesPerSector); /* Use shifting to avoid 64-bit division */
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DPRINT("SectorCount = %lu\n", SectorCount);
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memset(&BootSector, 0, sizeof(FAT16_BOOT_SECTOR));
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memcpy(&BootSector.OEMName[0], "MSWIN4.1", 8);
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BootSector.BytesPerSector = DiskGeometry->BytesPerSector;
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BootSector.SectorsPerCluster = ClusterSize / BootSector.BytesPerSector;
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BootSector.ReservedSectors = 1;
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BootSector.FATCount = 2;
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BootSector.RootEntries = 512;
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BootSector.Sectors = (SectorCount < 0x10000) ? (unsigned short)SectorCount : 0;
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BootSector.Media = 0xf8;
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BootSector.FATSectors = 0; /* Set later. See below. */
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BootSector.SectorsPerTrack = DiskGeometry->SectorsPerTrack;
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BootSector.Heads = DiskGeometry->TracksPerCylinder;
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BootSector.HiddenSectors = PartitionInfo->HiddenSectors;
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BootSector.SectorsHuge = (SectorCount >= 0x10000) ? (unsigned long)SectorCount : 0;
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BootSector.Drive = DiskGeometry->MediaType == FixedMedia ? 0x80 : 0x00;
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BootSector.ExtBootSignature = 0x29;
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BootSector.VolumeID = CalcVolumeSerialNumber();
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if ((Label == NULL) || (Label->Buffer == NULL))
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{
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memcpy(&BootSector.VolumeLabel[0], "NO NAME ", 11);
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}
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else
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{
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RtlUnicodeStringToOemString(&VolumeLabel, Label, TRUE);
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memset(&BootSector.VolumeLabel[0], ' ', 11);
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memcpy(&BootSector.VolumeLabel[0], VolumeLabel.Buffer,
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VolumeLabel.Length < 11 ? VolumeLabel.Length : 11);
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RtlFreeOemString(&VolumeLabel);
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}
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memcpy(&BootSector.SysType[0], "FAT12 ", 8);
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RootDirSectors = ((BootSector.RootEntries * 32) +
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(BootSector.BytesPerSector - 1)) / BootSector.BytesPerSector;
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/* Calculate number of FAT sectors */
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/* ((BootSector.BytesPerSector * 2) / 3) FAT entries (12bit) fit into one sector */
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TmpVal1 = SectorCount - (BootSector.ReservedSectors + RootDirSectors);
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TmpVal2 = (((BootSector.BytesPerSector * 2) / 3) * BootSector.SectorsPerCluster) + BootSector.FATCount;
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TmpVal3 = (TmpVal1 + (TmpVal2 - 1)) / TmpVal2;
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BootSector.FATSectors = (unsigned short)(TmpVal3 & 0xffff);
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DPRINT("BootSector.FATSectors = %hx\n", BootSector.FATSectors);
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/* Init context data */
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Context->TotalSectorCount =
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1 + (BootSector.FATSectors * 2) + RootDirSectors;
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Status = Fat12WriteBootSector(FileHandle,
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&BootSector,
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Context);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("Fat12WriteBootSector() failed with status 0x%.08x\n", Status);
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return Status;
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}
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/* Write first FAT copy */
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Status = Fat12WriteFAT(FileHandle,
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0,
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&BootSector,
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Context);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("Fat12WriteFAT() failed with status 0x%.08x\n", Status);
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return Status;
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}
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/* Write second FAT copy */
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Status = Fat12WriteFAT(FileHandle,
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(ULONG)BootSector.FATSectors,
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&BootSector,
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Context);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("Fat12WriteFAT() failed with status 0x%.08x.\n", Status);
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return Status;
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}
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Status = Fat12WriteRootDirectory(FileHandle,
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&BootSector,
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Context);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("Fat12WriteRootDirectory() failed with status 0x%.08x\n", Status);
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}
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if (!QuickFormat)
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{
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/* FIXME: Fill remaining sectors */
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}
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return Status;
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}
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