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Diffstat (limited to 'db2/btree/bt_conv.c')
-rw-r--r--db2/btree/bt_conv.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/db2/btree/bt_conv.c b/db2/btree/bt_conv.c
new file mode 100644
index 0000000000..537e2f98ec
--- /dev/null
+++ b/db2/btree/bt_conv.c
@@ -0,0 +1,83 @@
+/*-
+ * 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[] = "@(#)bt_conv.c 10.3 (Sleepycat) 8/9/97";
+#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 "btree.h"
+
+/*
+ * __bam_pgin, __bam_pgout --
+ * Convert host-specific page layout to/from the host-independent
+ * format stored on disk.
+ *
+ * PUBLIC: int __bam_pgin __P((db_pgno_t, void *, DBT *));
+ * PUBLIC: int __bam_pgout __P((db_pgno_t, void *, DBT *));
+ */
+int
+__bam_pgin(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 ? __bam_mswap(pp) : __db_pgin(pg, pp));
+}
+
+int
+__bam_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 ? __bam_mswap(pp) : __db_pgout(pg, pp));
+}
+
+/*
+ * __bam_mswap --
+ * Swap the bytes on the btree metadata page.
+ *
+ * PUBLIC: int __bam_mswap __P((PAGE *));
+ */
+int
+__bam_mswap(pg)
+ PAGE *pg;
+{
+ u_int8_t *p;
+
+ p = (u_int8_t *)pg;
+ SWAP32(p); /* lsn.file */
+ SWAP32(p); /* lsn.offset */
+ SWAP32(p); /* pgno */
+ SWAP32(p); /* magic */
+ SWAP32(p); /* version */
+ SWAP32(p); /* pagesize */
+ SWAP32(p); /* maxkey */
+ SWAP32(p); /* minkey */
+ SWAP32(p); /* free */
+ SWAP32(p); /* flags */
+ return (0);
+}