vcwindow.h revision 3f54fd611f536639ec30dd53c48e5ec1897cc7d9
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 2003-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#ifndef _VCWINDOW_H
#define _VCWINDOW_H 1
/* Window matching algorithms for delta compression of large files.
**
** Written by Kiem-Phong Vo
*/
typedef struct _vcwmatch_s Vcwmatch_t;
typedef struct _vcwmethod_s Vcwmethod_t;
typedef struct _vcwdisc_s Vcwdisc_t;
typedef struct _vcwindow_s Vcwindow_t;
typedef int (*Vcwevent_f)_ARG_((Vcwindow_t*, int, Void_t*, Vcwdisc_t*));
struct _vcwmatch_s
{ int type; /* VCD_[SOURCE|TARGET]FILE */
Sfoff_t wpos; /* position in file */
ssize_t wsize; /* size of matching window */
Void_t* wdata; /* window data */
ssize_t msize; /* amount of data actually matched */
int more; /* more subwindows to process */
};
struct _vcwmethod_s
{ Vcwmatch_t* (*applyf)_ARG_((Vcwindow_t*, Void_t*, size_t, Sfoff_t));
int (*eventf)_ARG_((Vcwindow_t*, int));
char* name;
char* desc;
char* about;
};
struct _vcwdisc_s
{ Sfio_t* srcf; /* source file */
Sfio_t* tarf; /* target file if any */
Vcwevent_f eventf;
};
struct _vcwindow_s
{ Vcwmethod_t* meth;
Vcwdisc_t* disc;
ssize_t cmpsz; /* size of result of last comp. attempt */
Vcwmatch_t match; /* space to return the matching window */
Void_t* mtdata;
};
/* window events */
#define VCW_OPENING 0
#define VCW_CLOSING 1
#define vcwfeedback(vcw, sz) ((vcw)->cmpsz = (sz))
#define vcwapply(vcw, dt, dtsz, p) \
(*(vcw)->meth->applyf)((vcw), (dt), (dtsz), (p))
_BEGIN_EXTERNS_
#if _BLD_vcodex && defined(__EXPORT__)
#define extern extern __EXPORT__
#endif
#if !_BLD_vcodex && defined(__IMPORT__)
#define extern extern __IMPORT__
#endif
extern Vcwmethod_t* Vcwmirror;
extern Vcwmethod_t* Vcwvote;
extern Vcwmethod_t* Vcwprefix;
#undef extern
#if _BLD_vcodex && defined(__EXPORT__)
#define extern __EXPORT__
#endif
extern Vcwindow_t* vcwopen _ARG_((Vcwdisc_t*, Vcwmethod_t*));
extern int vcwclose _ARG_((Vcwindow_t*));
extern Vcwmethod_t* vcwgetmeth _ARG_((char*));
extern int vcwwalkmeth _ARG_((Vcwalk_f, Void_t*));
#undef extern
_END_EXTERNS_
#endif /*_VCWINDOW_H*/