cdfs.c File Reference

#include "fs_rec.h"
#include <debug.h>
#include "cdfs.h"

Include dependency graph for cdfs.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
BOOLEAN NTAPI	FsRecIsCdfsVolume (IN PDEVICE_OBJECT DeviceObject, IN ULONG SectorSize)
NTSTATUS NTAPI	FsRecCdfsFsControl (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 14 of file cdfs.c.

Function Documentation

FsRecCdfsFsControl()

NTSTATUS NTAPI FsRecCdfsFsControl	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp
	)

Definition at line 66 of file cdfs.c.

{
    PDEVICE_OBJECT MountDevice;
    ULONG SectorSize;
    PIO_STACK_LOCATION Stack;
    NTSTATUS Status;
    PAGED_CODE();
 
    /* Get the I/O Stack and check the function type */
    Stack = IoGetCurrentIrpStackLocation(Irp);
    switch (Stack->MinorFunction)
    {
        case IRP_MN_MOUNT_VOLUME:
 
            /* Assume failure */
            Status = STATUS_UNRECOGNIZED_VOLUME;
 
            /* Get the device object and request the sector size */
            MountDevice = Stack->Parameters.MountVolume.DeviceObject;
            if (FsRecGetDeviceSectorSize(MountDevice, &SectorSize))
            {
                /* Check if it's an actual CDFS (ISO-9660) volume */
                if (FsRecIsCdfsVolume(MountDevice, SectorSize))
                {
                    /* It is! */
                    Status = STATUS_FS_DRIVER_REQUIRED;
                }
            }
 
            break;
 
        case IRP_MN_LOAD_FILE_SYSTEM:
 
            /* Load the file system */
            Status = FsRecLoadFileSystem(DeviceObject,
                                         L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\Cdfs");
            break;
 
        default:
 
            /* Invalid request */
            Status = STATUS_INVALID_DEVICE_REQUEST;
    }
 
    /* Return Status */
    return Status;
}

Referenced by FsRecFsControl().

FsRecIsCdfsVolume()

BOOLEAN NTAPI FsRecIsCdfsVolume	(	IN PDEVICE_OBJECT	DeviceObject,
		IN ULONG	SectorSize
	)

Definition at line 23 of file cdfs.c.

{
    BOOLEAN bReturnValue = FALSE;
    LARGE_INTEGER Offset;
    PVD_HEADER pVdHeader = NULL;
    PAGED_CODE();
 
    // Read the Primary Volume Descriptor.
    Offset.QuadPart = VD_HEADER_OFFSET;
    if (!FsRecReadBlock(DeviceObject, &Offset, sizeof(VD_HEADER), SectorSize, (PVOID*)&pVdHeader, NULL))
    {
        // We cannot read this block, so no reason to let the CDFS driver try it.
        goto Cleanup;
    }
 
    // Verify the fields.
    if (pVdHeader->Type != VD_TYPE_PRIMARY)
        goto Cleanup;
 
    DPRINT("pVdHeader->Type verified!\n");
 
    if (RtlCompareMemory(pVdHeader->Identifier, VD_IDENTIFIER, VD_IDENTIFIER_LENGTH) != VD_IDENTIFIER_LENGTH)
        goto Cleanup;
 
    DPRINT("pVdHeader->Identifier verified!\n");
 
    if (pVdHeader->Version != VD_VERSION)
        goto Cleanup;
 
    DPRINT("pVdHeader->Version verified! This is a CDFS volume!\n");
 
    bReturnValue = TRUE;
 
Cleanup:
    if (pVdHeader)
        ExFreePool(pVdHeader);
 
    return bReturnValue;
}

Referenced by FsRecCdfsFsControl().