1 |
root |
1.1 |
/********************************************************************* |
2 |
|
|
* * |
3 |
|
|
* Copyright (c) 1997,1998, 1999 * |
4 |
|
|
* Multimedia DB Group and DEIS - CSITE-CNR, * |
5 |
|
|
* University of Bologna, Bologna, ITALY. * |
6 |
|
|
* * |
7 |
|
|
* All Rights Reserved. * |
8 |
|
|
* * |
9 |
|
|
* Permission to use, copy, and distribute this software and its * |
10 |
|
|
* documentation for NON-COMMERCIAL purposes and without fee is * |
11 |
|
|
* hereby granted provided that this copyright notice appears in * |
12 |
|
|
* all copies. * |
13 |
|
|
* * |
14 |
|
|
* THE AUTHORS MAKE NO REPRESENTATIONS OR WARRANTIES ABOUT THE * |
15 |
|
|
* SUITABILITY OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING * |
16 |
|
|
* BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, * |
17 |
|
|
* FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. THE AUTHOR * |
18 |
|
|
* SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A * |
19 |
|
|
* RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS * |
20 |
|
|
* DERIVATIVES. * |
21 |
|
|
* * |
22 |
|
|
*********************************************************************/ |
23 |
|
|
|
24 |
|
|
#ifndef MTFILE_H |
25 |
|
|
#define MTFILE_H |
26 |
|
|
|
27 |
|
|
#include "GiSTstore.h" |
28 |
|
|
|
29 |
|
|
// MTfile is a simple storage class for GiSTs to work over |
30 |
|
|
// UNIX/NT files. It is a copy of the GiSTfile class. |
31 |
|
|
|
32 |
|
|
class MTfile: public GiSTstore { |
33 |
root |
1.2 |
unsigned int page; |
34 |
|
|
struct Page { |
35 |
|
|
GiSTpage page; |
36 |
|
|
char *buf; |
37 |
|
|
int dirty; |
38 |
|
|
int seq; |
39 |
|
|
}; |
40 |
|
|
Page *cache; |
41 |
|
|
unsigned int cachesize; |
42 |
|
|
|
43 |
|
|
Page *newpage(GiSTpage page); |
44 |
|
|
Page *findpage(GiSTpage page); |
45 |
|
|
void flushpage(Page *p); |
46 |
root |
1.1 |
public: |
47 |
root |
1.2 |
void setcache(unsigned int pages); |
48 |
|
|
|
49 |
|
|
MTfile(unsigned int pagesize) |
50 |
|
|
: GiSTstore(), page(pagesize), cachesize(0) |
51 |
|
|
{ |
52 |
|
|
setcache (16); |
53 |
|
|
} |
54 |
|
|
|
55 |
|
|
~MTfile(); |
56 |
root |
1.1 |
|
57 |
|
|
void Create(const char *filename); |
58 |
|
|
void Open(const char *filename); |
59 |
|
|
void Close(); |
60 |
|
|
|
61 |
|
|
void Read(GiSTpage page, char *buf); |
62 |
|
|
void Write(GiSTpage page, const char *buf); |
63 |
|
|
GiSTpage Allocate(); |
64 |
|
|
void Deallocate(GiSTpage page); |
65 |
root |
1.2 |
void Sync(); |
66 |
|
|
int PageSize() const { return page; } |
67 |
root |
1.1 |
|
68 |
|
|
private: |
69 |
|
|
int fileHandle; |
70 |
|
|
}; |
71 |
|
|
|
72 |
|
|
#endif |