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hellwig |
/* $NetBSD: ffs_tables.c,v 1.9 2005/12/11 12:25:25 christos Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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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. 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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* @(#)ffs_tables.c 8.1 (Berkeley) 6/11/93
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#if defined(__KERNEL_RCSID) && !defined(__lint)
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__KERNEL_RCSID(0, "$NetBSD: ffs_tables.c,v 1.9 2005/12/11 12:25:25 christos Exp $");
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#endif
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#include <sys/param.h>
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#include "common.h"
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#include "fs.h"
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/*
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* Bit patterns for identifying fragments in the block map
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* used as ((map & around) == inside)
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*/
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const int around[9] = {
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0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
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};
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const int inside[9] = {
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0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
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};
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/*
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* Given a block map bit pattern, the frag tables tell whether a
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* particular size fragment is available.
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*
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* used as:
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* if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] {
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* at least one fragment of the indicated size is available
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* }
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*
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* These tables are used by the scanc instruction on the VAX to
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* quickly find an appropriate fragment.
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*/
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const u_char fragtbl124[256] = {
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0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e,
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0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a,
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0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
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0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
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0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
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0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
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0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
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0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
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0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
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0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
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0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
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0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
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0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e,
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0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae,
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0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
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0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
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0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
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0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
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0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
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0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
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0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
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0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
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0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
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0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
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0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
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0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
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0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
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0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
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0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
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0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
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0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce,
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0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a,
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};
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const u_char fragtbl8[256] = {
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0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04,
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0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
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0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
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0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
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0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
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0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
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0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
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0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
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0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
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0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
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0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
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| 118 |
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0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
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| 119 |
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0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
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| 120 |
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0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
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0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
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| 122 |
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0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40,
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| 123 |
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0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
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| 124 |
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0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
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| 125 |
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0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
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| 126 |
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0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
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| 127 |
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0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
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| 128 |
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0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
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0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
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| 130 |
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0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
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| 131 |
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0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
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| 132 |
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0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
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| 133 |
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0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
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| 134 |
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0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12,
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| 135 |
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0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
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| 136 |
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0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c,
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| 137 |
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0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c,
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| 138 |
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0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
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| 139 |
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};
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| 141 |
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/*
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* The actual fragtbl array.
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*/
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const u_char * const fragtbl[MAXFRAG + 1] = {
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0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8,
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};
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