/* BEGIN_ICS_COPYRIGHT3 ****************************************

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** END_ICS_COPYRIGHT3   ****************************************/

/* [ICS VERSION STRING: unknown] */

#ifndef _IBA_PUBLIC_IHANDLETRANS_H_

#define _IBA_PUBLIC_IHANDLETRANS_H_

#include "iba/public/datatypes.h"

#include "iba/public/iarray.h"

#include "iba/public/iresmap.h"

#include "iba/public/ispinlock.h"

#ifdef __cplusplus

extern "C"

{

#endif

/****************************************************************************

 *

 * Handle Translator definition.

 *

 * A Handle Translator facilitates translation from 32 bit handles to

 * pointers to the corresponding resource.  This can provide 2

 * benefits:

 * - a handle validation function

 * - support for APIs (such as VAPI) with 32 bit handles

 *

 * Internally a Handle Translator uses a vector and a resource map which

 * can be dynamically resized as more handles are created.

 *

 * The handle 0 is reserved such that 0 can be treated as a invalid handle

 * Similarly, an unitialized/freed/deleted handle returns NULL for its pointer

 *

 * The Locked Handle Translator has its own spinlock and is thread safe

 */

/* handle translator structure is allocated by the user and is opaque to them */

typedef struct _LOCKED_HANDLE_TRANS

{ 

	SPIN_LOCK 		m_Lock;	/* protects structure */

	ARRAY 			m_List;	/* index is handle, contained object is ptr */

	RESOURCE_MAP	m_Map;	/* efficiently track available entries in Array */

} LOCKED_HANDLE_TRANS;

/****************************************************************************

 * LHandleTransInitState

 * 

 * Description:

 *	This function performs basic initialization.  This function cannot 

 *	fail.

 * 

 * Inputs:

 *	pLHandleTrans - Pointer to handle translator

 * 

 * Outputs:

 *	None.

 * 

 * Returns:

 *	None.

 * 

 ****************************************************************************/

void 

LHandleTransInitState(

	IN	LOCKED_HANDLE_TRANS* const	pLHandleTrans );

/****************************************************************************

 * LHandleTransInit

 * 

 * Description:

 *	This function initializes the handle translator.

 *	New entries in the translator are

 *	initialized to NULL.

 * 

 * Inputs:

 *	pLHandleTrans		- Pointer to handle translator

 *	InitialSize	- initial number of elements

 *	GrowSize	- number of elements to allocate when incrementally growing

 *				the handle translator

 *	MaxHandles	- maximum handles allowed, 0 if no limit

 *	MemFlags - memory allocate flags (IBA_MEM_FLAG_*)

 * 

 * Outputs:

 *	None.

 * 

 * Returns:

 *	FSUCCESS

 *	FINSUFFICIENT_MEMORY - failed to initialize translator

 * 

 ****************************************************************************/

FSTATUS

LHandleTransInit(

	IN	LOCKED_HANDLE_TRANS* const	pLHandleTrans,

	IN	const uint32	InitialSize,

	IN	const uint32	GrowSize,

	IN	const uint32	MaxHandles,

	IN	const uint32	MemFlags );

/****************************************************************************

 * LHandleTransDestroy

 * 

 * Description:

 *	This function deallocates all allocated memory associated with the 

 *	handle translator.

 *	If any operations did premptable memory allocate (via MemFlags), this

 *	may prempt.

 * 

 * Inputs:

 *	pLHandleTrans - Pointer to handle translator

 * 

 * Outputs:

 *	None.

 * 

 * Returns:

 *	None.

 * 

 ****************************************************************************/

void

LHandleTransDestroy(

	IN	LOCKED_HANDLE_TRANS* const	pLHandleTrans );

/****************************************************************************

 * LHandleTransCreateHandle

 * 

 * Description:

 *	This function creates a new 32 bit handle to the given pointer

 *	As necessary the internal vector may grow.

 * 

 * Inputs:

 *	pLHandleTrans- Pointer to handle translator.

 *	Ptr			- Pointer of object handle is for

 *	MemFlags - memory allocate flags (IBA_MEM_FLAG_*)

 * 

 * Outputs:

 *	pHandle		- Handle created

 * 

 * Returns:

 *	FSUCCESS

 *	FINSUFFICIENT_MEMORY	unable to grows translator

 *	FINSUFFICIENT_RESOURCES	would exceed MaxHandles specified in Init

 * 

 ****************************************************************************/

FSTATUS 

LHandleTransCreateHandle(

	IN	LOCKED_HANDLE_TRANS*	pLHandleTrans, 

	IN	const void*		Ptr,

	IN	const uint32	MemFlags,

	OUT	uint32* 		pHandle );

/****************************************************************************

 * LHandleTransReplaceHandle

 * 

 * Description:

 *	This function replaces the pointer which an existing handle points to

 * 

 * Inputs:

 *	pLHandleTrans- Pointer to handle translator.

 *	Handle		- previously created handle

 *	Ptr			- Pointer of object handle is for

 * 

 * Outputs:

 * 

 * Returns:

 *	FSUCCESS

 *	FINSUFFICIENT_MEMORY	The array could not be resized to accomodate the

 *							specified element.

 * 

 ****************************************************************************/

FSTATUS 

LHandleTransReplaceHandle(

	IN	LOCKED_HANDLE_TRANS*	pLHandleTrans, 

	IN	uint32 			Handle,

	IN	const void*		Ptr);

/****************************************************************************

 * LHandleTransDestroyHandle

 * 

 * Description:

 *	This function destroys a handle, by replacing its pointer with NULL

 * 

 * Inputs:

 *	pLHandleTrans- Pointer to handle translator.

 *	Handle		- previously created handle

 * 

 * Outputs:

 * 

 * Returns:

 * 	FSUCCESS - successfully destroyed handle

 * 	FINVALID_STATE - handle was not valid

 * 

 ****************************************************************************/

FSTATUS

LHandleTransDestroyHandle(

	IN	LOCKED_HANDLE_TRANS*	pLHandleTrans, 

	IN	uint32 			Handle );

/****************************************************************************

 * LHandleTransGetPtr

 * 

 * Description:

 *	This function translates from a handle to its corresponding pointer

 * 

 * Inputs:

 *	pLHandleTrans- Pointer to handle translator.

 *	Handle		- previously created handle

 * 

 * Outputs:

 * 

 * Returns:

 *  pointer assigned to handle (will be NULL if invalid handle)

 * 

 ****************************************************************************/

void* 

LHandleTransGetPtr(

	IN	LOCKED_HANDLE_TRANS*	pLHandleTrans, 

	IN	uint32 			Handle);

#ifdef __cplusplus

}	/* extern "C" */

#endif

#endif	/* _IBA_PUBLIC_IHANDLETRANS_H_ */