mirror of
https://github.com/reactos/reactos.git
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138 lines
3.6 KiB
C
138 lines
3.6 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: lib\fslib\vfatlib\common.c
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* PURPOSE: Common code for Fat support
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* PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
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* Eric Kohl
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* Hermes Belusca-Maito (hermes.belusca@sfr.fr)
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*/
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/* INCLUDES *******************************************************************/
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#include "vfatlib.h"
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS ******************************************************************/
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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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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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/***** Wipe function for FAT12, FAT16 and FAT32 formats *****/
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NTSTATUS
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FatWipeSectors(
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IN HANDLE FileHandle,
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IN ULONG TotalSectors,
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IN ULONG SectorsPerCluster,
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IN ULONG BytesPerSector,
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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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PUCHAR Buffer;
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LARGE_INTEGER FileOffset;
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ULONGLONG Sector;
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ULONG Length;
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NTSTATUS Status;
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Length = SectorsPerCluster * BytesPerSector;
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/* Allocate buffer for the cluster */
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Buffer = (PUCHAR)RtlAllocateHeap(RtlGetProcessHeap(),
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HEAP_ZERO_MEMORY,
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Length);
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if (Buffer == NULL)
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return STATUS_INSUFFICIENT_RESOURCES;
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/* Wipe all clusters */
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Sector = 0;
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while (Sector + SectorsPerCluster < TotalSectors)
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{
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FileOffset.QuadPart = Sector * 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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Length,
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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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goto done;
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}
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UpdateProgress(Context, SectorsPerCluster);
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Sector += SectorsPerCluster;
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}
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/* Wipe the trailing space behind the last cluster */
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if (Sector < TotalSectors)
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{
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DPRINT("Remaining sectors %lu\n", TotalSectors - Sector);
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FileOffset.QuadPart = Sector * BytesPerSector;
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Length = (TotalSectors - Sector) * 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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Length,
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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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goto done;
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}
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UpdateProgress(Context, TotalSectors - Sector);
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}
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done:
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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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/* EOF */
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