aboutsummaryrefslogtreecommitdiff
path: root/db2/hash/hash_conv.c
diff options
context:
space:
mode:
Diffstat (limited to 'db2/hash/hash_conv.c')
-rw-r--r--db2/hash/hash_conv.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/db2/hash/hash_conv.c b/db2/hash/hash_conv.c
new file mode 100644
index 0000000000..22901af950
--- /dev/null
+++ b/db2/hash/hash_conv.c
@@ -0,0 +1,101 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997
+ * Sleepycat Software. All rights reserved.
+ */
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)hash_conv.c 10.3 (Sleepycat) 6/21/97";
+#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"
+
+/*
+ * __h_pgin, __ham_pgout --
+ * Convert host-specific page layout to/from the host-independent
+ * format stored on disk.
+ *
+ * PUBLIC: int __ham_pgin __P((db_pgno_t, void *, DBT *));
+ * PUBLIC: int __ham_pgout __P((db_pgno_t, void *, DBT *));
+ */
+int
+__ham_pgin(pg, pp, cookie)
+ db_pgno_t pg;
+ void *pp;
+ DBT *cookie;
+{
+ DB_PGINFO *pginfo;
+ u_int32_t tpgno;
+
+ pginfo = (DB_PGINFO *)cookie->data;
+ tpgno = PGNO((PAGE *)pp);
+ if (pginfo->needswap)
+ M_32_SWAP(tpgno);
+
+ if (pg != PGNO_METADATA && pg != tpgno) {
+ P_INIT(pp, pginfo->db_pagesize,
+ pg, PGNO_INVALID, PGNO_INVALID, 0, P_HASH);
+ return (0);
+ }
+
+ if (!pginfo->needswap)
+ return (0);
+ return (pg == PGNO_METADATA ? __ham_mswap(pp) : __db_pgin(pg, pp));
+}
+
+int
+__ham_pgout(pg, pp, cookie)
+ db_pgno_t pg;
+ void *pp;
+ DBT *cookie;
+{
+ DB_PGINFO *pginfo;
+
+ pginfo = (DB_PGINFO *)cookie->data;
+ if (!pginfo->needswap)
+ return (0);
+ return (pg == PGNO_METADATA ? __ham_mswap(pp) : __db_pgout(pg, pp));
+}
+
+/*
+ * __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;
+
+ p = (u_int8_t *)pg;
+ SWAP32(p); /* lsn part 1 */
+ SWAP32(p); /* lsn part 2 */
+ SWAP32(p); /* pgno */
+ SWAP32(p); /* magic */
+ SWAP32(p); /* version */
+ SWAP32(p); /* pagesize */
+ SWAP32(p); /* ovfl_point */
+ SWAP32(p); /* last_freed */
+ SWAP32(p); /* max_bucket */
+ SWAP32(p); /* high_mask */
+ SWAP32(p); /* low_mask */
+ SWAP32(p); /* ffactor */
+ SWAP32(p); /* nelem */
+ SWAP32(p); /* h_charkey */
+ SWAP32(p); /* flags */
+ for (i = 0; i < NCACHED; ++i)
+ SWAP32(p); /* spares */
+ return (0);
+}