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222 lines
5.3 KiB
222 lines
5.3 KiB
/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Mike Olson.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)bt_conv.c 8.5 (Berkeley) 8/17/94";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <stdio.h>
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#include "../include/db.h"
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#include "btree.h"
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static void mswap __P((PAGE *));
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/*
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* __BT_BPGIN, __BT_BPGOUT --
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* Convert host-specific number layout to/from the host-independent
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* format stored on disk.
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*
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* Parameters:
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* t: tree
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* pg: page number
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* h: page to convert
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*/
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void
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__bt_pgin(t, pg, pp)
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void *t;
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pgno_t pg;
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void *pp;
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{
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PAGE *h;
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indx_t i, top;
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u_char flags;
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char *p;
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if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
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return;
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if (pg == P_META) {
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mswap(pp);
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return;
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}
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h = pp;
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M_32_SWAP(h->pgno);
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M_32_SWAP(h->prevpg);
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M_32_SWAP(h->nextpg);
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M_32_SWAP(h->flags);
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M_16_SWAP(h->lower);
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M_16_SWAP(h->upper);
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top = NEXTINDEX(h);
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if ((h->flags & P_TYPE) == P_BINTERNAL)
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for (i = 0; i < top; i++) {
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M_16_SWAP(h->linp[i]);
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p = (char *)GETBINTERNAL(h, i);
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P_32_SWAP(p);
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p += sizeof(u_int32_t);
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P_32_SWAP(p);
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p += sizeof(pgno_t);
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if (*(u_char *)p & P_BIGKEY) {
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p += sizeof(u_char);
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P_32_SWAP(p);
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p += sizeof(pgno_t);
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P_32_SWAP(p);
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}
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}
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else if ((h->flags & P_TYPE) == P_BLEAF)
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for (i = 0; i < top; i++) {
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M_16_SWAP(h->linp[i]);
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p = (char *)GETBLEAF(h, i);
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P_32_SWAP(p);
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p += sizeof(u_int32_t);
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P_32_SWAP(p);
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p += sizeof(u_int32_t);
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flags = *(u_char *)p;
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if (flags & (P_BIGKEY | P_BIGDATA)) {
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p += sizeof(u_char);
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if (flags & P_BIGKEY) {
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P_32_SWAP(p);
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p += sizeof(pgno_t);
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P_32_SWAP(p);
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}
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if (flags & P_BIGDATA) {
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p += sizeof(u_int32_t);
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P_32_SWAP(p);
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p += sizeof(pgno_t);
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P_32_SWAP(p);
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}
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}
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}
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}
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void
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__bt_pgout(t, pg, pp)
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void *t;
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pgno_t pg;
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void *pp;
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{
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PAGE *h;
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indx_t i, top;
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u_char flags;
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char *p;
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if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
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return;
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if (pg == P_META) {
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mswap(pp);
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return;
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}
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h = pp;
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top = NEXTINDEX(h);
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if ((h->flags & P_TYPE) == P_BINTERNAL)
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for (i = 0; i < top; i++) {
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p = (char *)GETBINTERNAL(h, i);
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P_32_SWAP(p);
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p += sizeof(u_int32_t);
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P_32_SWAP(p);
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p += sizeof(pgno_t);
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if (*(u_char *)p & P_BIGKEY) {
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p += sizeof(u_char);
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P_32_SWAP(p);
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p += sizeof(pgno_t);
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P_32_SWAP(p);
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}
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M_16_SWAP(h->linp[i]);
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}
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else if ((h->flags & P_TYPE) == P_BLEAF)
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for (i = 0; i < top; i++) {
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p = (char *)GETBLEAF(h, i);
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P_32_SWAP(p);
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p += sizeof(u_int32_t);
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P_32_SWAP(p);
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p += sizeof(u_int32_t);
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flags = *(u_char *)p;
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if (flags & (P_BIGKEY | P_BIGDATA)) {
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p += sizeof(u_char);
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if (flags & P_BIGKEY) {
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P_32_SWAP(p);
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p += sizeof(pgno_t);
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P_32_SWAP(p);
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}
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if (flags & P_BIGDATA) {
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p += sizeof(u_int32_t);
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P_32_SWAP(p);
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p += sizeof(pgno_t);
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P_32_SWAP(p);
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}
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}
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M_16_SWAP(h->linp[i]);
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}
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M_32_SWAP(h->pgno);
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M_32_SWAP(h->prevpg);
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M_32_SWAP(h->nextpg);
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M_32_SWAP(h->flags);
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M_16_SWAP(h->lower);
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M_16_SWAP(h->upper);
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}
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/*
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* MSWAP -- Actually swap the bytes on the meta page.
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*
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* Parameters:
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* p: page to convert
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*/
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static void
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mswap(pg)
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PAGE *pg;
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{
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char *p;
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p = (char *)pg;
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P_32_SWAP(p); /* magic */
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p += sizeof(u_int32_t);
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P_32_SWAP(p); /* version */
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p += sizeof(u_int32_t);
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P_32_SWAP(p); /* psize */
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p += sizeof(u_int32_t);
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P_32_SWAP(p); /* free */
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p += sizeof(u_int32_t);
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P_32_SWAP(p); /* nrecs */
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p += sizeof(u_int32_t);
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P_32_SWAP(p); /* flags */
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p += sizeof(u_int32_t);
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}
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