common.c File Reference

#include "vfatlib.h"
#include <debug.h>

Include dependency graph for common.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
ULONG	GetShiftCount (IN ULONG Value)
ULONG	CalcVolumeSerialNumber (VOID)
NTSTATUS	FatWipeSectors (IN HANDLE FileHandle, IN ULONG TotalSectors, IN ULONG SectorsPerCluster, IN ULONG BytesPerSector, IN OUT PFORMAT_CONTEXT Context)

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 15 of file common.c.

Function Documentation

CalcVolumeSerialNumber()

ULONG CalcVolumeSerialNumber

(

VOID

)

Definition at line 35 of file common.c.

{
    LARGE_INTEGER SystemTime;
    TIME_FIELDS TimeFields;
    ULONG Serial;
    PUCHAR Buffer;
 
    NtQuerySystemTime(&SystemTime);
    RtlTimeToTimeFields(&SystemTime, &TimeFields);
 
    Buffer = (PUCHAR)&Serial;
    Buffer[0] = (UCHAR)(TimeFields.Year & 0xFF) + (UCHAR)(TimeFields.Hour & 0xFF);
    Buffer[1] = (UCHAR)(TimeFields.Year >> 8) + (UCHAR)(TimeFields.Minute & 0xFF);
    Buffer[2] = (UCHAR)(TimeFields.Month & 0xFF) + (UCHAR)(TimeFields.Second & 0xFF);
    Buffer[3] = (UCHAR)(TimeFields.Day & 0xFF) + (UCHAR)(TimeFields.Milliseconds & 0xFF);
 
    return Serial;
}

Referenced by Fat12Format(), Fat16Format(), and Fat32Format().

FatWipeSectors()

NTSTATUS FatWipeSectors	(	IN HANDLE	FileHandle,
		IN ULONG	TotalSectors,
		IN ULONG	SectorsPerCluster,
		IN ULONG	BytesPerSector,
		IN OUT PFORMAT_CONTEXT	Context
	)

Definition at line 56 of file common.c.

{
    IO_STATUS_BLOCK IoStatusBlock;
    PUCHAR Buffer;
    LARGE_INTEGER FileOffset;
    ULONGLONG Sector;
    ULONG Length;
    NTSTATUS Status;
 
    Length = SectorsPerCluster * BytesPerSector;
 
    /* Allocate buffer for the cluster */
    Buffer = (PUCHAR)RtlAllocateHeap(RtlGetProcessHeap(),
                                     HEAP_ZERO_MEMORY,
                                     Length);
    if (Buffer == NULL)
        return STATUS_INSUFFICIENT_RESOURCES;
 
    /* Wipe all clusters */
    Sector = 0;
    while (Sector + SectorsPerCluster < TotalSectors)
    {
        FileOffset.QuadPart = Sector * BytesPerSector;
 
        Status = NtWriteFile(FileHandle,
                             NULL,
                             NULL,
                             NULL,
                             &IoStatusBlock,
                             Buffer,
                             Length,
                             &FileOffset,
                             NULL);
        if (!NT_SUCCESS(Status))
        {
            DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
            goto done;
        }
 
        UpdateProgress(Context, SectorsPerCluster);
 
        Sector += SectorsPerCluster;
    }
 
    /* Wipe the trailing space behind the last cluster */
    if (Sector < TotalSectors)
    {
        DPRINT("Remaining sectors %lu\n", TotalSectors - Sector);
 
        FileOffset.QuadPart = Sector * BytesPerSector;
        Length = (TotalSectors - Sector) * BytesPerSector;
 
        Status = NtWriteFile(FileHandle,
                             NULL,
                             NULL,
                             NULL,
                             &IoStatusBlock,
                             Buffer,
                             Length,
                             &FileOffset,
                             NULL);
        if (!NT_SUCCESS(Status))
        {
            DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
            goto done;
        }
 
        UpdateProgress(Context, TotalSectors - Sector);
    }
 
done:
    /* Free the buffer */
    RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
    return Status;
}

Referenced by Fat12Format(), Fat16Format(), and Fat32Format().

GetShiftCount()

ULONG GetShiftCount

(

IN ULONG

Value

)

Definition at line 21 of file common.c.

{
    ULONG i = 1;
 
    while (Value > 0)
    {
        i++;
        Value /= 2;
    }
 
    return i - 2;
}

Referenced by Fat12Format(), Fat16Format(), and Fat32Format().