pgpfileio.c

PGP8.0源码 请认真阅读您的文件包然后写出其具体功能

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

	$Id: pgpFileIO.c,v 1.4 2002/08/06 20:10:34 dallen Exp $
____________________________________________________________________________*/
/*
 * pgpFileIO.c -- Abstract base class for all PGPFileIO objects.
 */
#include "pgpPFLConfig.h"
#include "pgpPFLPriv.h"

#include "pgpPFLErrors.h"
#include "pgpFileIOPriv.h"
#include "pgpMem.h"


#define GetParentVTBL()		pgpIOGetClassVTBL()

#define GetSelfVTBL( ref ) \
	(PGPFileIOVtbl const *)pgpioGetObjectVTBL( ref )


	PGPBoolean
PGPFileIOIsValid( PGPFileIORef ref )
{
	if ( ! PGPIOIsValid( (PGPIORef)ref ) )
		return( FALSE );
	
	return( ref->fileIOMagic == kPGPFileIOMagic );
}





	static PGPError
sFileIOInitProc(
	PGPIORef	inRef,
	void *		data )
{
	PGPError		err		= kPGPError_NoErr;
	PGPFileIORef	self	= (PGPFileIORef)inRef;
	
	PGPValidateIO( inRef );
	
	err	= pgpioInheritInit( inRef, GetParentVTBL(), data );
	
	self->fileIOMagic	= kPGPFileIOMagic;
	self->autoClose		= TRUE;
	
	return( err );
}



	static PGPError
sFileIODestroyProc( PGPIORef	inRef )
{
	PGPError		err	= kPGPError_NoErr;
	PGPFileIORef	self	= (PGPFileIORef)inRef;

	PGPValidateFileIO( self );
	
	self->fileIOMagic	= 0;
	
	err	= pgpioInheritDestroy( inRef, GetParentVTBL() );
	
	return( err );
}


	PGPFileIOVtbl const *
pgpFileIOGetClassVTBL()
{
	static PGPFileIOVtbl	sVTBL	= { {NULL,} };
	PGPFileIOVtbl *			vtbl	= &sVTBL;
	
	if ( IsNull( vtbl->parentVTBL.initProc ) )
	{
		PGPIOVtbl *	parent	= &vtbl->parentVTBL;
		
		/* get default routines */
		*parent	= *pgpIOGetClassVTBL();
		parent->initProc	= sFileIOInitProc;
		parent->destroyProc	= sFileIODestroyProc;
	}
	
	return( vtbl );
}


























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