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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.
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: large_object.h,v 1.16 2000/10/21 15:55:29 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;
Relation index_r;
uint32 offset; /* current seek pointer */
Oid id;
#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_drop(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);
#endif /* LARGE_OBJECT_H */
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