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1. WDK7600里的ramdisk示例只实现1M的虚拟内存，改了ramdisk.inx和ramdisk.h里的内存设置，比如32M，还是不行。
2. 想实现加密存储，为了查看效果，先试图在写文件时加密，修改ramdisk.c中的RamDiskEvtIoWrite函数，但加载后蓝屏。
VOID
RamDiskEvtIoWrite(
IN WDFQUEUE Queue,
IN WDFREQUEST Request,
IN size_t Length
)
{
PDEVICE_EXTENSION devExt = QueueGetExtension(Queue)->DeviceExtension;
NTSTATUS Status = STATUS_INVALID_PARAMETER;
WDF_REQUEST_PARAMETERS Parameters;
LARGE_INTEGER ByteOffset;
WDFMEMORY hMemory;
//时间2010年4月21日12:52:03
PVOID buf_XOR_13=0;
unsigned char *p_Byte=0;
unsigned int count=0;
__analysis_assume(Length > 0);
WDF_REQUEST_PARAMETERS_INIT(&Parameters);
WdfRequestGetParameters(Request, &Parameters);
ByteOffset.QuadPart = Parameters.Parameters.Write.DeviceOffset;
if (RamDiskCheckParameters(devExt, ByteOffset, Length)) {
Status = WdfRequestRetrieveInputMemory(Request, &hMemory);
if(NT_SUCCESS(Status)){
//时间 2010年4月21日12:44:25
//写入时加密，异或0x13H
//Status = WdfMemoryCopyToBuffer(hMemory, // Source
// 0, // offset in Source memory where the copy has to start
// devExt->DiskImage + ByteOffset.LowPart, // destination
// Length);
buf_XOR_13=ExAllocatePoolWithTag(NonPagedPool,
Length,
RAMDISK_TAG);
Status = WdfMemoryCopyToBuffer(hMemory, // Source
0, // offset in Source memory where the copy has to start
buf_XOR_13, // destination
Length);
p_Byte=(unsigned char*)buf_XOR_13;
//怀疑真正写的长度很小，故Length改为3
for(count=0;count<3;count++)
{ *p_Byte = (*p_Byte) ^ 0x13;
p_Byte++;
}
Status = WdfMemoryCopyToBuffer((WDFMEMORY)buf_XOR_13, // Source
0, // offset in Source memory where the copy has to start
devExt->DiskImage + ByteOffset.LowPart, // destination
Length);
//释放内存
ExFreePool(buf_XOR_13);
}
}
WdfRequestCompleteWithInformation(Request, Status, (ULONG_PTR)Length);
}
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