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-rw-r--r--utils/db1-ast/btree/bt_conv.c221
1 files changed, 221 insertions, 0 deletions
diff --git a/utils/db1-ast/btree/bt_conv.c b/utils/db1-ast/btree/bt_conv.c
new file mode 100644
index 0000000..d2ebdc5
--- /dev/null
+++ b/utils/db1-ast/btree/bt_conv.c
@@ -0,0 +1,221 @@
+/*-
+ * Copyright (c) 1990, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Mike Olson.
+ *
+ * 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)bt_conv.c 8.5 (Berkeley) 8/17/94";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+
+#include <stdio.h>
+
+#include "../include/db.h"
+#include "btree.h"
+
+static void mswap __P((PAGE *));
+
+/*
+ * __BT_BPGIN, __BT_BPGOUT --
+ * Convert host-specific number layout to/from the host-independent
+ * format stored on disk.
+ *
+ * Parameters:
+ * t: tree
+ * pg: page number
+ * h: page to convert
+ */
+void
+__bt_pgin(t, pg, pp)
+ void *t;
+ pgno_t pg;
+ void *pp;
+{
+ PAGE *h;
+ indx_t i, top;
+ u_char flags;
+ char *p;
+
+ if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
+ return;
+ if (pg == P_META) {
+ mswap(pp);
+ return;
+ }
+
+ h = pp;
+ M_32_SWAP(h->pgno);
+ M_32_SWAP(h->prevpg);
+ M_32_SWAP(h->nextpg);
+ M_32_SWAP(h->flags);
+ M_16_SWAP(h->lower);
+ M_16_SWAP(h->upper);
+
+ top = NEXTINDEX(h);
+ if ((h->flags & P_TYPE) == P_BINTERNAL)
+ for (i = 0; i < top; i++) {
+ M_16_SWAP(h->linp[i]);
+ p = (char *)GETBINTERNAL(h, i);
+ P_32_SWAP(p);
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p);
+ p += sizeof(pgno_t);
+ if (*(u_char *)p & P_BIGKEY) {
+ p += sizeof(u_char);
+ P_32_SWAP(p);
+ p += sizeof(pgno_t);
+ P_32_SWAP(p);
+ }
+ }
+ else if ((h->flags & P_TYPE) == P_BLEAF)
+ for (i = 0; i < top; i++) {
+ M_16_SWAP(h->linp[i]);
+ p = (char *)GETBLEAF(h, i);
+ P_32_SWAP(p);
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p);
+ p += sizeof(u_int32_t);
+ flags = *(u_char *)p;
+ if (flags & (P_BIGKEY | P_BIGDATA)) {
+ p += sizeof(u_char);
+ if (flags & P_BIGKEY) {
+ P_32_SWAP(p);
+ p += sizeof(pgno_t);
+ P_32_SWAP(p);
+ }
+ if (flags & P_BIGDATA) {
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p);
+ p += sizeof(pgno_t);
+ P_32_SWAP(p);
+ }
+ }
+ }
+}
+
+void
+__bt_pgout(t, pg, pp)
+ void *t;
+ pgno_t pg;
+ void *pp;
+{
+ PAGE *h;
+ indx_t i, top;
+ u_char flags;
+ char *p;
+
+ if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
+ return;
+ if (pg == P_META) {
+ mswap(pp);
+ return;
+ }
+
+ h = pp;
+ top = NEXTINDEX(h);
+ if ((h->flags & P_TYPE) == P_BINTERNAL)
+ for (i = 0; i < top; i++) {
+ p = (char *)GETBINTERNAL(h, i);
+ P_32_SWAP(p);
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p);
+ p += sizeof(pgno_t);
+ if (*(u_char *)p & P_BIGKEY) {
+ p += sizeof(u_char);
+ P_32_SWAP(p);
+ p += sizeof(pgno_t);
+ P_32_SWAP(p);
+ }
+ M_16_SWAP(h->linp[i]);
+ }
+ else if ((h->flags & P_TYPE) == P_BLEAF)
+ for (i = 0; i < top; i++) {
+ p = (char *)GETBLEAF(h, i);
+ P_32_SWAP(p);
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p);
+ p += sizeof(u_int32_t);
+ flags = *(u_char *)p;
+ if (flags & (P_BIGKEY | P_BIGDATA)) {
+ p += sizeof(u_char);
+ if (flags & P_BIGKEY) {
+ P_32_SWAP(p);
+ p += sizeof(pgno_t);
+ P_32_SWAP(p);
+ }
+ if (flags & P_BIGDATA) {
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p);
+ p += sizeof(pgno_t);
+ P_32_SWAP(p);
+ }
+ }
+ M_16_SWAP(h->linp[i]);
+ }
+
+ M_32_SWAP(h->pgno);
+ M_32_SWAP(h->prevpg);
+ M_32_SWAP(h->nextpg);
+ M_32_SWAP(h->flags);
+ M_16_SWAP(h->lower);
+ M_16_SWAP(h->upper);
+}
+
+/*
+ * MSWAP -- Actually swap the bytes on the meta page.
+ *
+ * Parameters:
+ * p: page to convert
+ */
+static void
+mswap(pg)
+ PAGE *pg;
+{
+ char *p;
+
+ p = (char *)pg;
+ P_32_SWAP(p); /* magic */
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p); /* version */
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p); /* psize */
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p); /* free */
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p); /* nrecs */
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p); /* flags */
+ p += sizeof(u_int32_t);
+}