cvolumeimpdrv98.h

来自「PGP8.0源码 请认真阅读您的文件包然后写出其具体功能」· C头文件 代码 · 共 94 行

/*____________________________________________________________________________
		Copyright (C) 2002 PGP Corporation
        All rights reserved.

        $Id: CVolumeImpDrv98.h,v 1.5 2002/08/06 20:09:31 dallen Exp $
____________________________________________________________________________*/

#ifndef Included_CVolumeImpDrv98_h	// [
#define Included_CVolumeImpDrv98_h

#include "CString.h"
#include "CVolumeImp.h"

#include "CDcb.h"
#include "CIop.h"

_PGP_BEGIN

// Constants

#define LOCKP_ALLOW_WRITES		0x01	// Bit 0 set - allow writes
#define LOCKP_FAIL_WRITES		0x00	// Bit 0 clear - fail writes
#define LOCKP_FAIL_MEM_MAPPING	0x02	// Bit 1 set - fail memory mappings
#define LOCKP_ALLOW_MEM_MAPPING	0x00	// Bit 1 clear - allow memory mappings
#define LOCKP_USER_MASK			0x03	// Mask for user lock flags
#define LOCKP_LOCK_FOR_FORMAT	0x04	// Level 0 lock for format

// Class CVolumeImpDrv98

class CVolumeImpDrv98 : public CVolumeImp
{
	friend class CDriverImpFactoryDrv98;

public:
	typedef void (_cdecl *IopDispatchFunc)(CIop& iop, void *refPtr);

private:
	enum LockLevel {LockLevelNone, LockLevel1, LockLevel2, LockLevel3, 
		LockLevel0, LockLevel0MR};

private:
	CVolumeImpDrv98();
	~CVolumeImpDrv98();

	const char *	DeviceName() const {return mDeviceName;}

	PGPBoolean	HasOpenFiles();

	CComboError	AttachVolume(const char *root, const char *deviceName);
	void		DetachVolume();

	CComboError	Mount(const char *deviceName, const char *root, 
		PGPUInt64 totalBlocks, PGPUInt32 blockSize, 
		const void *iopDispatchFunc, void *refPtr, PGPBoolean readOnly);
	CComboError	Unmount(PGPBoolean isForced);

	CComboError	LockForIO();
	CComboError	LockForFormat();
	CComboError	UnlockVolume();

	CComboError	Read(void *buf, PGPUInt64 pos, PGPUInt32 nBlocks) const;
	CComboError	Write(const void *buf, PGPUInt64 pos, PGPUInt32 nBlocks);

private:
	CDcb	mDcb;
	CString	mDeviceName;

	IopDispatchFunc	mDispatchFunc;
	void			*mRefPtr;

	CComboError	GetLockLevel(LockLevel& lockLevel) const;
	CComboError	SetLockLevel(LockLevel lockLevel, 
		PGPUInt8 permissions = LOCKP_ALLOW_WRITES);

	CComboError	AcquireFormatLock();
	CComboError	ReleaseFormatLock();

	CComboError	FillInBlockInfo();

	void		InitDcb(PGPUInt8 drive, PGPUInt64 totalBlocks, 
		PGPUInt32 blockSize, PGPBoolean readOnly);

	CComboError	DiskAccess(PGPUInt16 func, void *buf, PGPUInt64 pos, 
		PGPUInt32 nBlocks) const;

	void		DispatchIopAux(CIop& iop);
	static void	DispatchIopStub(PIOP pIop);
	static void	DispatchIop(PIOP pIop);
};

_PGP_END

#endif	// ] Included_CVolumeImpDrv98_h