+++ /dev/null
-/*-
- * 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/cdefs.h>
-__FBSDID("$FreeBSD: src/lib/libc/db/btree/bt_conv.c,v 1.2 2002/03/21 22:46:25 obrien Exp $");
-
-#include <sys/param.h>
-
-#include <stdio.h>
-
-#include <db.h>
-#include "btree.h"
-
-static void mswap(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);
-}
projects / apple / libc.git / blobdiff