/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS VFAT filesystem library
* FILE: fat16.c
* PURPOSE: Fat16 support
* PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
* Eric Kohl
*/
/* INCLUDES *******************************************************************/
#include "vfatlib.h"
#define NDEBUG
#include <debug.h>
/* FUNCTIONS ******************************************************************/
static NTSTATUS
Fat16WriteBootSector(IN HANDLE FileHandle,
IN PFAT16_BOOT_SECTOR BootSector,
IN OUT PFORMAT_CONTEXT Context)
{
IO_STATUS_BLOCK IoStatusBlock;
NTSTATUS Status;
PFAT16_BOOT_SECTOR NewBootSector;
LARGE_INTEGER FileOffset;
/* Allocate buffer for new bootsector */
NewBootSector = (PFAT16_BOOT_SECTOR)RtlAllocateHeap(RtlGetProcessHeap(),
0,
BootSector->BytesPerSector);
if (NewBootSector == NULL)
return STATUS_INSUFFICIENT_RESOURCES;
/* Zero the new bootsector */
RtlZeroMemory(NewBootSector, BootSector->BytesPerSector);
/* Copy FAT16 BPB to new bootsector */
memcpy(NewBootSector, BootSector,
FIELD_OFFSET(FAT16_BOOT_SECTOR, Res2) - FIELD_OFFSET(FAT16_BOOT_SECTOR, Jump));
/* FAT16 BPB length (up to (not including) Res2) */
/* Write the boot sector signature */
NewBootSector->Signature1 = 0xAA550000;
/* Write sector 0 */
FileOffset.QuadPart = 0ULL;
Status = NtWriteFile(FileHandle,
NULL,
NULL,
NULL,
&IoStatusBlock,
NewBootSector,
BootSector->BytesPerSector,
&FileOffset,
NULL);
if (!NT_SUCCESS(Status))
{
DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
goto done;
}
UpdateProgress(Context, 1);
done:
/* Free the buffer */
RtlFreeHeap(RtlGetProcessHeap(), 0, NewBootSector);
return Status;
}
static NTSTATUS
Fat16WriteFAT(IN HANDLE FileHandle,
IN ULONG SectorOffset,
IN PFAT16_BOOT_SECTOR BootSector,
IN OUT PFORMAT_CONTEXT Context)
{
IO_STATUS_BLOCK IoStatusBlock;
NTSTATUS Status;
PUCHAR Buffer;
LARGE_INTEGER FileOffset;
ULONG i;
ULONG Sectors;
/* Allocate buffer */
Buffer = (PUCHAR)RtlAllocateHeap(RtlGetProcessHeap(),
0,
32 * 1024);
if (Buffer == NULL)
return STATUS_INSUFFICIENT_RESOURCES;
/* Zero the buffer */
RtlZeroMemory(Buffer, 32 * 1024);
/* FAT cluster 0 */
Buffer[0] = 0xf8; /* Media type */
Buffer[1] = 0xff;
/* FAT cluster 1 */
Buffer[2] = 0xff; /* Clean shutdown, no disk read/write errors, end-of-cluster (EOC) mark */
Buffer[3] = 0xff;
/* Write first sector of the FAT */
FileOffset.QuadPart = (SectorOffset + BootSector->ReservedSectors) * BootSector->BytesPerSector;
Status = NtWriteFile(FileHandle,
NULL,
NULL,
NULL,
&IoStatusBlock,
Buffer,
BootSector->BytesPerSector,
&FileOffset,
NULL);
if (!NT_SUCCESS(Status))
{
DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
goto done;
}
UpdateProgress(Context, 1);
/* Zero the begin of the buffer */
RtlZeroMemory(Buffer, 4);
/* Zero the rest of the FAT */
Sectors = 32 * 1024 / BootSector->BytesPerSector;
for (i = 1; i < (ULONG)BootSector->FATSectors; i += Sectors)
{
/* Zero some sectors of the FAT */
FileOffset.QuadPart = (SectorOffset + BootSector->ReservedSectors + i) * BootSector->BytesPerSector;
if (((ULONG)BootSector->FATSectors - i) <= Sectors)
{
Sectors = (ULONG)BootSector->FATSectors - i;
}
Status = NtWriteFile(FileHandle,
NULL,
NULL,
NULL,
&IoStatusBlock,
Buffer,
Sectors * BootSector->BytesPerSector,
&FileOffset,
NULL);
if (!NT_SUCCESS(Status))
{
DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
goto done;
}
UpdateProgress(Context, Sectors);
}
done:
/* Free the buffer */
RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
return Status;
}
static NTSTATUS
Fat16WriteRootDirectory(IN HANDLE FileHandle,
IN PFAT16_BOOT_SECTOR BootSector,
IN OUT PFORMAT_CONTEXT Context)
{
IO_STATUS_BLOCK IoStatusBlock;
NTSTATUS Status = STATUS_SUCCESS;
PUCHAR Buffer;
LARGE_INTEGER FileOffset;
ULONG FirstRootDirSector;
ULONG RootDirSectors;
ULONG Sectors;
ULONG i;
DPRINT("BootSector->ReservedSectors = %hu\n", BootSector->ReservedSectors);
DPRINT("BootSector->FATSectors = %hu\n", BootSector->FATSectors);
DPRINT("BootSector->SectorsPerCluster = %u\n", BootSector->SectorsPerCluster);
/* Write cluster */
RootDirSectors = ((BootSector->RootEntries * 32) +
(BootSector->BytesPerSector - 1)) / BootSector->BytesPerSector;
FirstRootDirSector =
BootSector->ReservedSectors + (BootSector->FATCount * BootSector->FATSectors);
DPRINT("RootDirSectors = %lu\n", RootDirSectors);
DPRINT("FirstRootDirSector = %lu\n", FirstRootDirSector);
/* Allocate buffer for the cluster */
Buffer = (PUCHAR)RtlAllocateHeap(RtlGetProcessHeap(),
0,
32 * 1024);
if (Buffer == NULL)
return STATUS_INSUFFICIENT_RESOURCES;
/* Zero the buffer */
RtlZeroMemory(Buffer, 32 * 1024);
Sectors = 32 * 1024 / BootSector->BytesPerSector;
for (i = 0; i < RootDirSectors; i += Sectors)
{
/* Zero some sectors of the root directory */
FileOffset.QuadPart = (FirstRootDirSector + i) * BootSector->BytesPerSector;
if ((RootDirSectors - i) <= Sectors)
{
Sectors = RootDirSectors - i;
}
Status = NtWriteFile(FileHandle,
NULL,
NULL,
NULL,
&IoStatusBlock,
Buffer,
Sectors * BootSector->BytesPerSector,
&FileOffset,
NULL);
if (!NT_SUCCESS(Status))
{
DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
goto done;
}
UpdateProgress(Context, Sectors);
}
done:
/* Free the buffer */
RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
return Status;
}
NTSTATUS
Fat16Format(IN HANDLE FileHandle,
IN PPARTITION_INFORMATION PartitionInfo,
IN PDISK_GEOMETRY DiskGeometry,
IN PUNICODE_STRING Label,
IN BOOLEAN QuickFormat,
IN ULONG ClusterSize,
IN OUT PFORMAT_CONTEXT Context)
{
FAT16_BOOT_SECTOR BootSector;
OEM_STRING VolumeLabel;
ULONG SectorCount;
ULONG RootDirSectors;
ULONG TmpVal1;
ULONG TmpVal2;
ULONG TmpVal3;
NTSTATUS Status;
/* Calculate cluster size */
if (ClusterSize == 0)
{
if (PartitionInfo->PartitionLength.QuadPart < 16LL * 1024LL * 1024LL)
{
/* Partition < 16MB ==> 1KB Cluster */
ClusterSize = 1024;
}
else if (PartitionInfo->PartitionLength.QuadPart < 128LL * 1024LL * 1024LL)
{
/* Partition < 128MB ==> 2KB Cluster */
ClusterSize = 2048;
}
else if (PartitionInfo->PartitionLength.QuadPart < 256LL * 1024LL * 1024LL)
{
/* Partition < 256MB ==> 4KB Cluster */
ClusterSize = 4096;
}
else
{
/* Partition >= 256MB (< 512MB) ==> 8KB Cluster */
ClusterSize = 8192;
}
}
SectorCount = PartitionInfo->PartitionLength.QuadPart >>
GetShiftCount(DiskGeometry->BytesPerSector); /* Use shifting to avoid 64-bit division */
RtlZeroMemory(&BootSector, sizeof(FAT16_BOOT_SECTOR));
memcpy(&BootSector.OEMName[0], "MSWIN4.1", 8);
/* FIXME: Add dummy bootloader for real */
BootSector.Jump[0] = 0xeb;
BootSector.Jump[1] = 0x3c;
BootSector.Jump[2] = 0x90;
BootSector.BytesPerSector = DiskGeometry->BytesPerSector;
BootSector.SectorsPerCluster = ClusterSize / BootSector.BytesPerSector;
BootSector.ReservedSectors = 1;
BootSector.FATCount = 2;
BootSector.RootEntries = 512;
BootSector.Sectors = (SectorCount < 0x10000) ? (unsigned short)SectorCount : 0;
BootSector.Media = 0xf8;
BootSector.FATSectors = 0; /* Set later. See below. */
BootSector.SectorsPerTrack = DiskGeometry->SectorsPerTrack;
BootSector.Heads = DiskGeometry->TracksPerCylinder;
BootSector.HiddenSectors = PartitionInfo->HiddenSectors;
BootSector.SectorsHuge = (SectorCount >= 0x10000) ? (unsigned long)SectorCount : 0;
BootSector.Drive = (DiskGeometry->MediaType == FixedMedia) ? 0x80 : 0x00;
BootSector.ExtBootSignature = 0x29;
BootSector.VolumeID = CalcVolumeSerialNumber();
if ((Label == NULL) || (Label->Buffer == NULL))
{
memcpy(&BootSector.VolumeLabel[0], "NO NAME ", 11);
}
else
{
RtlUnicodeStringToOemString(&VolumeLabel, Label, TRUE);
RtlFillMemory(&BootSector.VolumeLabel[0], 11, ' ');
memcpy(&BootSector.VolumeLabel[0], VolumeLabel.Buffer,
VolumeLabel.Length < 11 ? VolumeLabel.Length : 11);
RtlFreeOemString(&VolumeLabel);
}
memcpy(&BootSector.SysType[0], "FAT16 ", 8);
DPRINT("BootSector.SectorsHuge = %lx\n", BootSector.SectorsHuge);
RootDirSectors = ((BootSector.RootEntries * 32) +
(BootSector.BytesPerSector - 1)) / BootSector.BytesPerSector;
/* Calculate number of FAT sectors */
/* (BootSector.BytesPerSector / 2) FAT entries (16bit) fit into one sector */
TmpVal1 = SectorCount - (BootSector.ReservedSectors + RootDirSectors);
TmpVal2 = ((BootSector.BytesPerSector / 2) * BootSector.SectorsPerCluster) + BootSector.FATCount;
TmpVal3 = (TmpVal1 + (TmpVal2 - 1)) / TmpVal2;
BootSector.FATSectors = (unsigned short)(TmpVal3 & 0xffff);
DPRINT("BootSector.FATSectors = %hu\n", BootSector.FATSectors);
/* Init context data */
Context->TotalSectorCount =
1 + (BootSector.FATSectors * 2) + RootDirSectors;
if (!QuickFormat)
{
Context->TotalSectorCount += SectorCount;
Status = FatWipeSectors(FileHandle,
SectorCount,
(ULONG)BootSector.SectorsPerCluster,
(ULONG)BootSector.BytesPerSector,
Context);
if (!NT_SUCCESS(Status))
{
DPRINT("FatWipeSectors() failed with status 0x%.08x\n", Status);
return Status;
}
}
Status = Fat16WriteBootSector(FileHandle,
&BootSector,
Context);
if (!NT_SUCCESS(Status))
{
DPRINT("Fat16WriteBootSector() failed with status 0x%.08x\n", Status);
return Status;
}
/* Write first FAT copy */
Status = Fat16WriteFAT(FileHandle,
0,
&BootSector,
Context);
if (!NT_SUCCESS(Status))
{
DPRINT("Fat16WriteFAT() failed with status 0x%.08x\n", Status);
return Status;
}
/* Write second FAT copy */
Status = Fat16WriteFAT(FileHandle,
(ULONG)BootSector.FATSectors,
&BootSector,
Context);
if (!NT_SUCCESS(Status))
{
DPRINT("Fat16WriteFAT() failed with status 0x%.08x.\n", Status);
return Status;
}
Status = Fat16WriteRootDirectory(FileHandle,
&BootSector,
Context);
if (!NT_SUCCESS(Status))
{
DPRINT("Fat16WriteRootDirectory() failed with status 0x%.08x\n", Status);
}
return Status;
}