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/*-------------------------------------------------------------------------
*
* 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 1.9 1998/09/01 04:38:22 momjian 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_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);
/* added for buffer leak prevention [ PA ] */
extern void inv_cleanindex(LargeObjectDesc *obj_desc);
#endif /* LARGE_OBJECT_H */
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