[apple/libc.git] / db / btree / FreeBSD / bt_conv.c

/*-
 * 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.
 * 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 1.4 2009/03/02 23:47:18 delphij 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(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(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(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);
}
Commit	Line	Data
9385eb3d A	1	/*-
9385eb3d A	2	* Copyright (c) 1990, 1993, 1994
e9ce8d39 A	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Mike Olson.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
e9ce8d39 A	16	* 4. Neither the name of the University nor the names of its contributors
	17	* may be used to endorse or promote products derived from this software
	18	* without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	21	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	* SUCH DAMAGE.
	31	*/
	32
9385eb3d A	33	#if defined(LIBC_SCCS) && !defined(lint)
	34	static char sccsid[] = "@(#)bt_conv.c 8.5 (Berkeley) 8/17/94";
	35	#endif /* LIBC_SCCS and not lint */
	36	#include <sys/cdefs.h>
1f2f436a	37	__FBSDID("$FreeBSD: src/lib/libc/db/btree/bt_conv.c,v 1.4 2009/03/02 23:47:18 delphij Exp $");
e9ce8d39 A	38
	39	#include <sys/param.h>
	40
	41	#include <stdio.h>
	42
	43	#include <db.h>
	44	#include "btree.h"
	45
9385eb3d	46	static void mswap(PAGE *);
e9ce8d39 A	47
	48	/*
	49	* __BT_BPGIN, __BT_BPGOUT --
	50	* Convert host-specific number layout to/from the host-independent
	51	* format stored on disk.
	52	*
	53	* Parameters:
	54	* t: tree
	55	* pg: page number
	56	* h: page to convert
	57	*/
	58	void
1f2f436a	59	__bt_pgin(void t, pgno_t pg, void pp)
e9ce8d39 A	60	{
	61	PAGE *h;
	62	indx_t i, top;
	63	u_char flags;
	64	char *p;
	65
9385eb3d	66	if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
e9ce8d39 A	67	return;
	68	if (pg == P_META) {
	69	mswap(pp);
	70	return;
	71	}
	72
	73	h = pp;
	74	M_32_SWAP(h->pgno);
	75	M_32_SWAP(h->prevpg);
	76	M_32_SWAP(h->nextpg);
	77	M_32_SWAP(h->flags);
	78	M_16_SWAP(h->lower);
	79	M_16_SWAP(h->upper);
	80
	81	top = NEXTINDEX(h);
	82	if ((h->flags & P_TYPE) == P_BINTERNAL)
	83	for (i = 0; i < top; i++) {
	84	M_16_SWAP(h->linp[i]);
	85	p = (char *)GETBINTERNAL(h, i);
	86	P_32_SWAP(p);
9385eb3d	87	p += sizeof(u_int32_t);
e9ce8d39 A	88	P_32_SWAP(p);
	89	p += sizeof(pgno_t);
	90	if ((u_char )p & P_BIGKEY) {
	91	p += sizeof(u_char);
	92	P_32_SWAP(p);
	93	p += sizeof(pgno_t);
	94	P_32_SWAP(p);
	95	}
	96	}
	97	else if ((h->flags & P_TYPE) == P_BLEAF)
	98	for (i = 0; i < top; i++) {
	99	M_16_SWAP(h->linp[i]);
	100	p = (char *)GETBLEAF(h, i);
	101	P_32_SWAP(p);
9385eb3d	102	p += sizeof(u_int32_t);
e9ce8d39	103	P_32_SWAP(p);
9385eb3d	104	p += sizeof(u_int32_t);
e9ce8d39 A	105	flags = (u_char )p;
	106	if (flags & (P_BIGKEY \| P_BIGDATA)) {
	107	p += sizeof(u_char);
	108	if (flags & P_BIGKEY) {
	109	P_32_SWAP(p);
	110	p += sizeof(pgno_t);
	111	P_32_SWAP(p);
	112	}
	113	if (flags & P_BIGDATA) {
9385eb3d	114	p += sizeof(u_int32_t);
e9ce8d39 A	115	P_32_SWAP(p);
	116	p += sizeof(pgno_t);
	117	P_32_SWAP(p);
	118	}
	119	}
	120	}
	121	}
	122
	123	void
1f2f436a	124	__bt_pgout(void t, pgno_t pg, void pp)
e9ce8d39 A	125	{
	126	PAGE *h;
	127	indx_t i, top;
	128	u_char flags;
	129	char *p;
	130
9385eb3d	131	if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
e9ce8d39 A	132	return;
	133	if (pg == P_META) {
	134	mswap(pp);
	135	return;
	136	}
	137
	138	h = pp;
	139	top = NEXTINDEX(h);
	140	if ((h->flags & P_TYPE) == P_BINTERNAL)
	141	for (i = 0; i < top; i++) {
	142	p = (char *)GETBINTERNAL(h, i);
	143	P_32_SWAP(p);
9385eb3d	144	p += sizeof(u_int32_t);
e9ce8d39 A	145	P_32_SWAP(p);
	146	p += sizeof(pgno_t);
	147	if ((u_char )p & P_BIGKEY) {
	148	p += sizeof(u_char);
	149	P_32_SWAP(p);
	150	p += sizeof(pgno_t);
	151	P_32_SWAP(p);
	152	}
	153	M_16_SWAP(h->linp[i]);
	154	}
	155	else if ((h->flags & P_TYPE) == P_BLEAF)
	156	for (i = 0; i < top; i++) {
	157	p = (char *)GETBLEAF(h, i);
	158	P_32_SWAP(p);
9385eb3d	159	p += sizeof(u_int32_t);
e9ce8d39	160	P_32_SWAP(p);
9385eb3d	161	p += sizeof(u_int32_t);
e9ce8d39 A	162	flags = (u_char )p;
	163	if (flags & (P_BIGKEY \| P_BIGDATA)) {
	164	p += sizeof(u_char);
	165	if (flags & P_BIGKEY) {
	166	P_32_SWAP(p);
	167	p += sizeof(pgno_t);
	168	P_32_SWAP(p);
	169	}
	170	if (flags & P_BIGDATA) {
9385eb3d	171	p += sizeof(u_int32_t);
e9ce8d39 A	172	P_32_SWAP(p);
	173	p += sizeof(pgno_t);
	174	P_32_SWAP(p);
	175	}
	176	}
	177	M_16_SWAP(h->linp[i]);
	178	}
	179
	180	M_32_SWAP(h->pgno);
	181	M_32_SWAP(h->prevpg);
	182	M_32_SWAP(h->nextpg);
	183	M_32_SWAP(h->flags);
	184	M_16_SWAP(h->lower);
	185	M_16_SWAP(h->upper);
	186	}
	187
	188	/*
	189	* MSWAP -- Actually swap the bytes on the meta page.
	190	*
	191	* Parameters:
	192	* p: page to convert
	193	*/
	194	static void
1f2f436a	195	mswap(PAGE *pg)
e9ce8d39 A	196	{
	197	char *p;
	198
	199	p = (char *)pg;
9385eb3d	200	P_32_SWAP(p); /* magic */
e9ce8d39	201	p += sizeof(u_int32_t);
9385eb3d	202	P_32_SWAP(p); /* version */
e9ce8d39	203	p += sizeof(u_int32_t);
9385eb3d	204	P_32_SWAP(p); /* psize */
e9ce8d39	205	p += sizeof(u_int32_t);
9385eb3d	206	P_32_SWAP(p); /* free */
e9ce8d39	207	p += sizeof(u_int32_t);
9385eb3d	208	P_32_SWAP(p); /* nrecs */
e9ce8d39	209	p += sizeof(u_int32_t);
9385eb3d	210	P_32_SWAP(p); /* flags */
e9ce8d39 A	211	p += sizeof(u_int32_t);
e9ce8d39 A	212	}