Postgres95 1.01 Distribution - Virgin SourcesPG95-1_01

1 files changed, 58 insertions, 0 deletions

diff --git a/src/backend/storage/large_object.h b/src/backend/storage/large_object.h
new file mode 100644
index 00000000000..177d2c26e47
--- /dev/null
+++ b/src/backend/storage/large_object.h
@@ -0,0 +1,58 @@
+/*-------------------------------------------------------------------------
+ *
+ * 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 1.1.1.1 1996/07/09 06:21:53 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef	LARGE_OBJECT_H
+#define	LARGE_OBJECT_H
+
+#include "c.h"
+#include "utils/rel.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 */