Import changeset

1 files changed, 112 insertions, 0 deletions

diff --git a/bdb/hash/hash_conv.c b/bdb/hash/hash_conv.c
new file mode 100644
index 00000000000..30d17a6164d
--- /dev/null
+++ b/bdb/hash/hash_conv.c
@@ -0,0 +1,112 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997, 1998, 1999, 2000
+ *	Sleepycat Software.  All rights reserved.
+ */
+#include "db_config.h"
+
+#ifndef lint
+static const char revid[] = "$Id: hash_conv.c,v 11.5 2000/03/31 00:30:32 ubell Exp $";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+#endif
+
+#include "db_int.h"
+#include "db_page.h"
+#include "db_swap.h"
+#include "hash.h"
+
+/*
+ * __ham_pgin --
+ *	Convert host-specific page layout from the host-independent format
+ *	stored on disk.
+ *
+ * PUBLIC: int __ham_pgin __P((DB_ENV *, db_pgno_t, void *, DBT *));
+ */
+int
+__ham_pgin(dbenv, pg, pp, cookie)
+	DB_ENV *dbenv;
+	db_pgno_t pg;
+	void *pp;
+	DBT *cookie;
+{
+	DB_PGINFO *pginfo;
+	PAGE *h;
+
+	h = pp;
+	pginfo = (DB_PGINFO *)cookie->data;
+
+	/*
+	 * The hash access method does blind reads of pages, causing them
+	 * to be created.  If the type field isn't set it's one of them,
+	 * initialize the rest of the page and return.
+	 */
+	if (h->type != P_HASHMETA && h->pgno == PGNO_INVALID) {
+		P_INIT(pp, pginfo->db_pagesize,
+		    pg, PGNO_INVALID, PGNO_INVALID, 0, P_HASH);
+		return (0);
+	}
+
+	if (!pginfo->needswap)
+		return (0);
+
+	return (h->type == P_HASHMETA ?  __ham_mswap(pp) :
+	    __db_byteswap(dbenv, pg, pp, pginfo->db_pagesize, 1));
+}
+
+/*
+ * __ham_pgout --
+ *	Convert host-specific page layout to the host-independent format
+ *	stored on disk.
+ *
+ * PUBLIC: int __ham_pgout __P((DB_ENV *, db_pgno_t, void *, DBT *));
+ */
+int
+__ham_pgout(dbenv, pg, pp, cookie)
+	DB_ENV *dbenv;
+	db_pgno_t pg;
+	void *pp;
+	DBT *cookie;
+{
+	DB_PGINFO *pginfo;
+	PAGE *h;
+
+	pginfo = (DB_PGINFO *)cookie->data;
+	if (!pginfo->needswap)
+		return (0);
+
+	h = pp;
+	return (h->type == P_HASHMETA ?  __ham_mswap(pp) :
+	     __db_byteswap(dbenv, pg, pp, pginfo->db_pagesize, 0));
+}
+
+/*
+ * __ham_mswap --
+ *	Swap the bytes on the hash metadata page.
+ *
+ * PUBLIC: int __ham_mswap __P((void *));
+ */
+int
+__ham_mswap(pg)
+	void *pg;
+{
+	u_int8_t *p;
+	int i;
+
+	__db_metaswap(pg);
+
+	p = (u_int8_t *)pg + sizeof(DBMETA);
+
+	SWAP32(p);		/* max_bucket */
+	SWAP32(p);		/* high_mask */
+	SWAP32(p);		/* low_mask */
+	SWAP32(p);		/* ffactor */
+	SWAP32(p);		/* nelem */
+	SWAP32(p);		/* h_charkey */
+	for (i = 0; i < NCACHED; ++i)
+		SWAP32(p);	/* spares */
+	return (0);
+}