1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/*-------------------------------------------------------------------------
*
* large_object.h--
* file of info for Postgres large objects. POSTGRES 4.2 supports
* zillions of large objects (internal, external, jaquith, inversion).
* Now we only support inversion.
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: large_object.h,v 1.3 1996/11/05 06:10:58 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef LARGE_OBJECT_H
#define LARGE_OBJECT_H
#include <sys/types.h>
#include <access/relscan.h>
/*
* This structure will eventually have lots more stuff associated with it.
*/
typedef struct LargeObjectDesc
{
Relation heap_r; /* heap relation */
Relation index_r; /* index relation on seqno attribute */
IndexScanDesc iscan; /* index scan we're using */
TupleDesc hdesc; /* heap relation tuple desc */
TupleDesc idesc; /* index relation tuple desc */
uint32 lowbyte; /* low byte on the current page */
uint32 highbyte; /* high byte on the current page */
uint32 offset; /* current seek pointer */
ItemPointerData htid; /* tid of current heap tuple */
#define IFS_RDLOCK (1 << 0)
#define IFS_WRLOCK (1 << 1)
#define IFS_ATEOF (1 << 2)
u_long flags; /* locking info, etc */
} LargeObjectDesc;
/*
* Function definitions...
*/
/* inversion stuff in inv_api.c */
extern LargeObjectDesc *inv_create(int flags);
extern LargeObjectDesc *inv_open(Oid lobjId, int flags);
extern void inv_close(LargeObjectDesc *obj_desc);
extern int inv_destroy(Oid lobjId);
extern int inv_stat(LargeObjectDesc *obj_desc, struct pgstat *stbuf);
extern int inv_seek(LargeObjectDesc *obj_desc, int offset, int whence);
extern int inv_tell(LargeObjectDesc *obj_desc);
extern int inv_read(LargeObjectDesc *obj_desc, char *buf, int nbytes);
extern int inv_write(LargeObjectDesc *obj_desc, char *buf, int nbytes);
#endif /* LARGE_OBJECT_H */
|
