[apple/xnu.git] / bsd / ufs / ffs / ffs_tables.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 *
 *	@(#)ffs_tables.c	8.1 (Berkeley) 6/11/93
 */

#include <sys/param.h>

/*
 * Bit patterns for identifying fragments in the block map
 * used as ((map & around) == inside)
 */
int around[9] = {
	0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
};
int inside[9] = {
	0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
};

/*
 * Given a block map bit pattern, the frag tables tell whether a
 * particular size fragment is available. 
 *
 * used as:
 * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] {
 *	at least one fragment of the indicated size is available
 * }
 *
 * These tables are used by the scanc instruction on the VAX to
 * quickly find an appropriate fragment.
 */
u_char fragtbl124[256] = {
	0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e,
	0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a,
	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
	0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
	0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
	0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e,
	0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae,
	0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
	0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
	0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
	0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
	0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
	0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
	0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
	0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
	0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
	0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
	0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce,
	0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a,
};

u_char fragtbl8[256] = {
	0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04,
	0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
	0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
	0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
	0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
	0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
	0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
	0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
	0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
	0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
	0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
	0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40,
	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
	0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
	0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
	0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
	0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
	0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
	0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
	0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
	0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
	0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12,
	0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
	0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c,
	0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c,
	0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
};

/*
 * The actual fragtbl array.
 */
u_char *fragtbl[MAXFRAG + 1] = {
	0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8,
};
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	26	/*
	27	* Copyright (c) 1982, 1986, 1993
	28	* The Regents of the University of California. All rights reserved.
	29	*
	30	* Redistribution and use in source and binary forms, with or without
	31	* modification, are permitted provided that the following conditions
	32	* are met:
	33	* 1. Redistributions of source code must retain the above copyright
	34	* notice, this list of conditions and the following disclaimer.
	35	* 2. Redistributions in binary form must reproduce the above copyright
	36	* notice, this list of conditions and the following disclaimer in the
	37	* documentation and/or other materials provided with the distribution.
	38	* 3. All advertising materials mentioning features or use of this software
	39	* must display the following acknowledgement:
	40	* This product includes software developed by the University of
	41	* California, Berkeley and its contributors.
	42	* 4. Neither the name of the University nor the names of its contributors
	43	* may be used to endorse or promote products derived from this software
	44	* without specific prior written permission.
	45	*
	46	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	47	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	48	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	49	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	50	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	51	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	52	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	53	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	54	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	55	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	56	* SUCH DAMAGE.
	57	*
	58	* @(#)ffs_tables.c 8.1 (Berkeley) 6/11/93
	59	*/
	60
	61	#include <sys/param.h>
	62
	63	/*
	64	* Bit patterns for identifying fragments in the block map
	65	* used as ((map & around) == inside)
	66	*/
	67	int around[9] = {
	68	0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
	69	};
	70	int inside[9] = {
	71	0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
	72	};
	73
	74	/*
	75	* Given a block map bit pattern, the frag tables tell whether a
	76	* particular size fragment is available.
	77	*
	78	* used as:
	79	* if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] {
	80	* at least one fragment of the indicated size is available
	81	* }
	82	*
	83	* These tables are used by the scanc instruction on the VAX to
	84	* quickly find an appropriate fragment.
	85	*/
86	u_char fragtbl124[256] = {
87	0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e,
88	0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a,
89	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
90	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
91	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
92	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
93	0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
94	0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
95	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
96	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
97	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
98	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
99	0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e,
100	0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae,
101	0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
102	0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
103	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
104	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
105	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
106	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
107	0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
108	0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
109	0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
110	0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
111	0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
112	0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
113	0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
114	0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
115	0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
116	0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
117	0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce,
118	0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a,
119	};
120
121	u_char fragtbl8[256] = {
122	0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04,
123	0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
124	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
125	0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
126	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
127	0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
128	0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
129	0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
130	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
131	0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
132	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
133	0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
134	0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
135	0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
136	0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
137	0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40,
138	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
139	0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
140	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
141	0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
142	0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
143	0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
144	0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
145	0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
146	0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
147	0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
148	0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
149	0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12,
150	0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
151	0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c,
152	0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c,
153	0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
154	};
155
156	/*
157	* The actual fragtbl array.
158	*/
159	u_char *fragtbl[MAXFRAG + 1] = {
160	0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8,
161	};