summary refs log tree commit diff
path: root/db2/db/db_conv.c
diff options
context:
space:
mode:
Diffstat (limited to 'db2/db/db_conv.c')
-rw-r--r--db2/db/db_conv.c219
1 files changed, 219 insertions, 0 deletions
diff --git a/db2/db/db_conv.c b/db2/db/db_conv.c
new file mode 100644
index 0000000000..39527c6804
--- /dev/null
+++ b/db2/db/db_conv.c
@@ -0,0 +1,219 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997
+ *	Sleepycat Software.  All rights reserved.
+ */
+/*
+ * Copyright (c) 1990, 1993, 1994, 1995, 1996
+ *	Keith Bostic.  All rights reserved.
+ */
+/*
+ * Copyright (c) 1990, 1993, 1994, 1995
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)db_conv.c	10.4 (Sleepycat) 8/15/97";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#include <errno.h>
+#endif
+
+#include "db_int.h"
+#include "db_page.h"
+#include "db_swap.h"
+#include "db_am.h"
+
+static int __db_convert __P((db_pgno_t, void *, int));
+
+/*
+ * __db_pgin, __db_pgout --
+ *
+ * PUBLIC: int __db_pgin __P((db_pgno_t, void *));
+ * PUBLIC: int __db_pgout __P((db_pgno_t, void *));
+ */
+int
+__db_pgin(pg, pp)
+	db_pgno_t pg;
+	void *pp;
+{
+	return (__db_convert(pg, pp, 1));
+}
+
+int
+__db_pgout(pg, pp)
+	db_pgno_t pg;
+	void *pp;
+{
+	return (__db_convert(pg, pp, 0));
+}
+
+/*
+ * __db_convert --
+ *	Actually convert a page.
+ */
+static int
+__db_convert(pg, pp, pgin)
+	db_pgno_t pg;			/* Unused, but left for the future. */
+	void *pp;
+	int pgin;
+{
+	BINTERNAL *bi;
+	BKEYDATA *bk;
+	BOVERFLOW *bo;
+	HKEYDATA *hk;
+	PAGE *h;
+	RINTERNAL *ri;
+	db_indx_t i;
+	u_int8_t *p;
+
+	h = pp;
+	if (pgin) {
+		M_32_SWAP(h->lsn.file);
+		M_32_SWAP(h->lsn.offset);
+		M_32_SWAP(h->pgno);
+		M_32_SWAP(h->prev_pgno);
+		M_32_SWAP(h->next_pgno);
+		M_16_SWAP(h->entries);
+		M_16_SWAP(h->hf_offset);
+	}
+
+	switch (h->type) {
+	case P_HASH:
+		for (i = 0; i < NUM_ENT(h); i++) {
+			if (pgin)
+				M_16_SWAP(h->inp[i]);
+
+			hk = GET_HKEYDATA(h, i);
+			switch (hk->type) {
+			case H_KEYDATA:
+				break;
+			case H_DUPLICATE:
+			case H_OFFPAGE:
+				p = (u_int8_t *)hk + sizeof(u_int8_t);
+				++p;
+				SWAP32(p);			/* tlen */
+				SWAP32(p);			/* pgno */
+				SWAP16(p);			/* offset */
+				SWAP16(p);			/* len */
+				break;
+			}
+
+			if (!pgin)
+				M_16_SWAP(h->inp[i]);
+		}
+		break;
+	case P_LBTREE:
+	case P_LRECNO:
+	case P_DUPLICATE:
+		for (i = 0; i < NUM_ENT(h); i++) {
+			if (pgin)
+				M_16_SWAP(h->inp[i]);
+
+			bk = GET_BKEYDATA(h, i);
+			switch (bk->type) {
+			case B_KEYDATA:
+				M_16_SWAP(bk->len);
+				break;
+			case B_DUPLICATE:
+			case B_OVERFLOW:
+				bo = (BOVERFLOW *)bk;
+				M_32_SWAP(bo->tlen);
+				M_32_SWAP(bo->pgno);
+				break;
+			}
+
+			if (!pgin)
+				M_16_SWAP(h->inp[i]);
+		}
+		break;
+	case P_IBTREE:
+		for (i = 0; i < NUM_ENT(h); i++) {
+			if (pgin)
+				M_16_SWAP(h->inp[i]);
+
+			bi = GET_BINTERNAL(h, i);
+			switch (bi->type) {
+			case B_KEYDATA:
+				M_16_SWAP(bi->len);
+				M_32_SWAP(bi->pgno);
+				M_32_SWAP(bi->nrecs);
+				break;
+			case B_DUPLICATE:
+			case B_OVERFLOW:
+				bo = (BOVERFLOW *)bi;
+				M_32_SWAP(bo->tlen);
+				M_32_SWAP(bo->pgno);
+				break;
+			}
+
+			if (!pgin)
+				M_16_SWAP(h->inp[i]);
+		}
+		break;
+	case P_IRECNO:
+		for (i = 0; i < NUM_ENT(h); i++) {
+			if (pgin)
+				M_16_SWAP(h->inp[i]);
+
+			ri = GET_RINTERNAL(h, i);
+			M_32_SWAP(ri->pgno);
+			M_32_SWAP(ri->nrecs);
+
+			if (!pgin)
+				M_16_SWAP(h->inp[i]);
+		}
+	case P_OVERFLOW:
+	case P_INVALID:
+		/* Nothing to do. */
+		break;
+	default:
+		return (EINVAL);
+	}
+
+	if (!pgin) {
+		/* Swap the header information. */
+		M_32_SWAP(h->lsn.file);
+		M_32_SWAP(h->lsn.offset);
+		M_32_SWAP(h->pgno);
+		M_32_SWAP(h->prev_pgno);
+		M_32_SWAP(h->next_pgno);
+		M_16_SWAP(h->entries);
+		M_16_SWAP(h->hf_offset);
+	}
+	return (0);
+}