helper.h

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typedef struct _DRIVERSTATUS {
    UCHAR  bDriverError;
    UCHAR  bIDEError;
    UCHAR  bReserved[2];
    ULONG  dwReserved[2];
} DRIVERSTATUS, *PDRIVERSTATUS, *LPDRIVERSTATUS;

typedef struct _IDEREGS {
    UCHAR  bFeaturesReg;
    UCHAR  bSectorCountReg;
    UCHAR  bSectorNumberReg;
    UCHAR  bCylLowReg;
    UCHAR  bCylHighReg;
    UCHAR  bDriveHeadReg;
    UCHAR  bCommandReg;
    UCHAR  bReserved;
} IDEREGS, *PIDEREGS, *LPIDEREGS;

#define ATAPI_ID_CMD                      0xA1
#define ID_CMD                            0xEC
#define SMART_CMD                         0xB0

#include <pshpack1.h>
typedef struct _SENDCMDOUTPARAMS {
    ULONG  cBufferSize;
    DRIVERSTATUS  DriverStatus;
    UCHAR  bBuffer[1];
} SENDCMDOUTPARAMS, *PSENDCMDOUTPARAMS, *LPSENDCMDOUTPARAMS;

typedef struct _SENDCMDINPARAMS {
    ULONG  cBufferSize;
    IDEREGS  irDriveRegs;
    UCHAR  bDriveNumber;
    UCHAR  bReserved[3];
    ULONG  dwReserved[4];
    UCHAR  bBuffer[1];
} SENDCMDINPARAMS, *PSENDCMDINPARAMS, *LPSENDCMDINPARAMS;
#include <poppack.h>