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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libvcodex/Vcwindow/vcwindow.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) 2003-2011 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 _VCWINDOW_H

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#define _VCWINDOW_H	1

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/* Window matching algorithms for delta compression of large files.

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**

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** Written by Kiem-Phong Vo

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*/

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typedef struct _vcwmatch_s	Vcwmatch_t;

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typedef struct _vcwmethod_s	Vcwmethod_t;

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typedef struct _vcwdisc_s	Vcwdisc_t;

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typedef struct _vcwindow_s	Vcwindow_t;

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typedef int	(*Vcwevent_f)_ARG_((Vcwindow_t*, int, Void_t*, Vcwdisc_t*));

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struct _vcwmatch_s

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{	int		type;	/* VCD_[SOURCE|TARGET]FILE		*/

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	Sfoff_t		wpos;	/* position in file			*/

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	ssize_t		wsize;	/* size of matching window		*/

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	Void_t*		wdata;	/* window data				*/

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	ssize_t		msize;	/* amount of data actually matched	*/

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	int		more;	/* more subwindows to process		*/

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};

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struct _vcwmethod_s

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{	Vcwmatch_t*	(*applyf)_ARG_((Vcwindow_t*, Void_t*, size_t, Sfoff_t));

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	int		(*eventf)_ARG_((Vcwindow_t*, int));

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	char*		name;

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	char*		desc;

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	char*		about;

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}; 

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struct _vcwdisc_s

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{	Sfio_t*		srcf;	/* source file				*/

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	Sfio_t*		tarf;	/* target file if any			*/

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	Vcwevent_f	eventf;

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};

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struct _vcwindow_s

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{	Vcwmethod_t*	meth;

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	Vcwdisc_t*	disc;

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	ssize_t		cmpsz;	/* size of result of last comp. attempt	*/

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	Vcwmatch_t	match;	/* space to return the matching window	*/

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	Void_t*		mtdata;

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};

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/* window events */

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#define VCW_OPENING	0

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#define VCW_CLOSING	1

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#define vcwfeedback(vcw, sz)	((vcw)->cmpsz = (sz))

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#define vcwapply(vcw, dt, dtsz, p) \

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			(*(vcw)->meth->applyf)((vcw), (dt), (dtsz), (p))

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_BEGIN_EXTERNS_

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#if _BLD_vcodex && defined(__EXPORT__)

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#define extern		extern __EXPORT__

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#endif

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#if !_BLD_vcodex && defined(__IMPORT__)

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#define extern		extern __IMPORT__

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#endif

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extern Vcwmethod_t*	Vcwmirror;

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extern Vcwmethod_t*	Vcwvote;

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extern Vcwmethod_t*	Vcwprefix;

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#undef	extern

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#if _BLD_vcodex && defined(__EXPORT__)

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#define extern	__EXPORT__

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#endif

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extern Vcwindow_t*	vcwopen _ARG_((Vcwdisc_t*, Vcwmethod_t*));

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extern int		vcwclose _ARG_((Vcwindow_t*));

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extern Vcwmethod_t*	vcwgetmeth _ARG_((char*));

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extern int		vcwwalkmeth _ARG_((Vcwalk_f, Void_t*));

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#undef	extern

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_END_EXTERNS_

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#endif /*_VCWINDOW_H*/

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