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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libvdelta/vdelta.h
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1995-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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

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#ifndef _VDELTA_H

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#define _VDELTA_H	1

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/*	Header for the vdelta library

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**	Written by Kiem-Phong Vo ([email protected])

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*/

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/* standardize conventions */

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#ifndef __KPV__

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#define __KPV__		1

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/* The symbol __STD_C indicates that the language is ANSI-C or C++ */

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#ifndef __STD_C

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#ifdef __STDC__

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#define	__STD_C		1

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#else

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#if __cplusplus || c_plusplus

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#define __STD_C		1

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#else

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#define __STD_C		0

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#endif /*__cplusplus*/

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#endif /*__STDC__*/

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#endif /*__STD_C*/

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/* For C++, extern symbols must be protected against name mangling */

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#ifndef _BEGIN_EXTERNS_

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#if __cplusplus || c_plusplus

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#define _BEGIN_EXTERNS_	extern "C" {

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#define _END_EXTERNS_	}

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#else

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#define _BEGIN_EXTERNS_

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#define _END_EXTERNS_

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#endif

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#endif /*_BEGIN_EXTERNS_*/

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/* _ARG_ simplifies function prototypes between K&R-C and more modern Cs */

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#ifndef _ARG_

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#if __STD_C

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#define _ARG_(x)	x

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#else

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#define _ARG_(x)	()

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#endif

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#endif /*_ARG_*/

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/* The type Void_t is properly defined so that Void_t* can address any type */

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#ifndef Void_t

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#if __STD_C

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#define Void_t		void

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#else

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#define Void_t		char

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#endif

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#endif /*Void_t*/

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/* The below are for DLLs on systems such as WINDOWS that only

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** allows pointers across client ** and library code.

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*/

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#ifndef _PTR_

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#if  _DLL_INDIRECT_DATA && !defined(_DLL)	/* building client code		*/

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#define _ADR_ 		/* cannot export whole structs - data access via ptrs	*/

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#define _PTR_	*

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#else			/* library code or a normal system			*/

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#define _ADR_	&	/* exporting whole struct is ok				*/

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#define _PTR_ 

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#endif

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#endif /*_PTR_*/

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#endif /*__KPV__*/

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/* user-supplied functions to do io */

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typedef struct _vddisc_s	Vddisc_t;

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typedef int(*	Vdio_f)_ARG_((Void_t*, int, long, Vddisc_t*));

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struct _vddisc_s

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{	long	size;		/* total data size	*/

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	Void_t*	data;		/* data array		*/

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	Vdio_f	readf;		/* to read data		*/

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	Vdio_f	writef;		/* to write data	*/

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};

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/* magic header for delta output */

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#define VD_MAGIC	"\026\004\000\002"

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#define VD_MAGIC_OLD	"vd02"

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_BEGIN_EXTERNS_

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extern long	vddelta _ARG_((Vddisc_t*,Vddisc_t*,Vddisc_t*));

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extern long	vdupdate _ARG_((Vddisc_t*,Vddisc_t*,Vddisc_t*));

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extern int	vdsqueeze _ARG_((Void_t*, int, Void_t*));

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extern int	vdexpand _ARG_((Void_t*, int, Void_t*));

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_END_EXTERNS_

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#endif /*_VDELTA_H*/

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