[apple/libc.git] / db / btree / bt_conv-fbsd.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.
 * 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);
}
Commit	Line	Data
224c7076 A	1	/*-
	2	* Copyright (c) 1990, 1993, 1994
	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.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
	35	*/
	36
	37	#if defined(LIBC_SCCS) && !defined(lint)
	38	static char sccsid[] = "@(#)bt_conv.c 8.5 (Berkeley) 8/17/94";
	39	#endif /* LIBC_SCCS and not lint */
	40	#include <sys/cdefs.h>
	41	__FBSDID("$FreeBSD: src/lib/libc/db/btree/bt_conv.c,v 1.2 2002/03/21 22:46:25 obrien Exp $");
	42
	43	#include <sys/param.h>
	44
	45	#include <stdio.h>
	46
	47	#include <db.h>
	48	#include "btree.h"
	49
	50	static void mswap(PAGE *);
	51
	52	/*
	53	* __BT_BPGIN, __BT_BPGOUT --
	54	* Convert host-specific number layout to/from the host-independent
	55	* format stored on disk.
	56	*
	57	* Parameters:
	58	* t: tree
	59	* pg: page number
	60	* h: page to convert
	61	*/
	62	void
	63	__bt_pgin(t, pg, pp)
	64	void *t;
65	pgno_t pg;
66	void *pp;
67	{
68	PAGE *h;
69	indx_t i, top;
70	u_char flags;
71	char *p;
72
73	if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
74	return;
75	if (pg == P_META) {
76	mswap(pp);
77	return;
78	}
79
80	h = pp;
81	M_32_SWAP(h->pgno);
82	M_32_SWAP(h->prevpg);
83	M_32_SWAP(h->nextpg);
84	M_32_SWAP(h->flags);
85	M_16_SWAP(h->lower);
86	M_16_SWAP(h->upper);
87
88	top = NEXTINDEX(h);
89	if ((h->flags & P_TYPE) == P_BINTERNAL)
90	for (i = 0; i < top; i++) {
91	M_16_SWAP(h->linp[i]);
92	p = (char *)GETBINTERNAL(h, i);
93	P_32_SWAP(p);
94	p += sizeof(u_int32_t);
95	P_32_SWAP(p);
96	p += sizeof(pgno_t);
97	if ((u_char )p & P_BIGKEY) {
98	p += sizeof(u_char);
99	P_32_SWAP(p);
100	p += sizeof(pgno_t);
101	P_32_SWAP(p);
102	}
103	}
104	else if ((h->flags & P_TYPE) == P_BLEAF)
105	for (i = 0; i < top; i++) {
106	M_16_SWAP(h->linp[i]);
107	p = (char *)GETBLEAF(h, i);
108	P_32_SWAP(p);
109	p += sizeof(u_int32_t);
110	P_32_SWAP(p);
111	p += sizeof(u_int32_t);
112	flags = (u_char )p;
113	if (flags & (P_BIGKEY \| P_BIGDATA)) {
114	p += sizeof(u_char);
115	if (flags & P_BIGKEY) {
116	P_32_SWAP(p);
117	p += sizeof(pgno_t);
118	P_32_SWAP(p);
119	}
120	if (flags & P_BIGDATA) {
121	p += sizeof(u_int32_t);
122	P_32_SWAP(p);
123	p += sizeof(pgno_t);
124	P_32_SWAP(p);
125	}
126	}
127	}
128	}
129
130	void
131	__bt_pgout(t, pg, pp)
132	void *t;
133	pgno_t pg;
134	void *pp;
135	{
136	PAGE *h;
137	indx_t i, top;
138	u_char flags;
139	char *p;
140
141	if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
142	return;
143	if (pg == P_META) {
144	mswap(pp);
145	return;
146	}
147
148	h = pp;
149	top = NEXTINDEX(h);
150	if ((h->flags & P_TYPE) == P_BINTERNAL)
151	for (i = 0; i < top; i++) {
152	p = (char *)GETBINTERNAL(h, i);
153	P_32_SWAP(p);
154	p += sizeof(u_int32_t);
155	P_32_SWAP(p);
156	p += sizeof(pgno_t);
157	if ((u_char )p & P_BIGKEY) {
158	p += sizeof(u_char);
159	P_32_SWAP(p);
160	p += sizeof(pgno_t);
161	P_32_SWAP(p);
162	}
163	M_16_SWAP(h->linp[i]);
164	}
165	else if ((h->flags & P_TYPE) == P_BLEAF)
166	for (i = 0; i < top; i++) {
167	p = (char *)GETBLEAF(h, i);
168	P_32_SWAP(p);
169	p += sizeof(u_int32_t);
170	P_32_SWAP(p);
171	p += sizeof(u_int32_t);
172	flags = (u_char )p;
173	if (flags & (P_BIGKEY \| P_BIGDATA)) {
174	p += sizeof(u_char);
175	if (flags & P_BIGKEY) {
176	P_32_SWAP(p);
177	p += sizeof(pgno_t);
178	P_32_SWAP(p);
179	}
180	if (flags & P_BIGDATA) {
181	p += sizeof(u_int32_t);
182	P_32_SWAP(p);
183	p += sizeof(pgno_t);
184	P_32_SWAP(p);
185	}
186	}
187	M_16_SWAP(h->linp[i]);
188	}
189
190	M_32_SWAP(h->pgno);
191	M_32_SWAP(h->prevpg);
192	M_32_SWAP(h->nextpg);
193	M_32_SWAP(h->flags);
194	M_16_SWAP(h->lower);
195	M_16_SWAP(h->upper);
196	}
197
198	/*
199	* MSWAP -- Actually swap the bytes on the meta page.
200	*
201	* Parameters:
202	* p: page to convert
203	*/
204	static void
205	mswap(pg)
206	PAGE *pg;
207	{
208	char *p;
209
210	p = (char *)pg;
211	P_32_SWAP(p); /* magic */
212	p += sizeof(u_int32_t);
213	P_32_SWAP(p); /* version */
214	p += sizeof(u_int32_t);
215	P_32_SWAP(p); /* psize */
216	p += sizeof(u_int32_t);
217	P_32_SWAP(p); /* free */
218	p += sizeof(u_int32_t);
219	P_32_SWAP(p); /* nrecs */
220	p += sizeof(u_int32_t);
221	P_32_SWAP(p); /* flags */
222	p += sizeof(u_int32_t);
223	}