Annotation of sys/ufs/ffs/ffs_tables.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: ffs_tables.c,v 1.5 2003/08/26 16:10:57 mickey Exp $ */
! 2: /* $NetBSD: ffs_tables.c,v 1.2 1994/06/29 06:46:35 cgd Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1982, 1986, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 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. 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: * @(#)ffs_tables.c 8.1 (Berkeley) 6/11/93
! 33: */
! 34:
! 35: #include <sys/param.h>
! 36: #include <ufs/ffs/fs.h>
! 37:
! 38: /*
! 39: * Bit patterns for identifying fragments in the block map
! 40: * used as ((map & around) == inside)
! 41: */
! 42: const int around[9] = {
! 43: 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
! 44: };
! 45: const int inside[9] = {
! 46: 0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
! 47: };
! 48:
! 49: /*
! 50: * Given a block map bit pattern, the frag tables tell whether a
! 51: * particular size fragment is available.
! 52: *
! 53: * used as:
! 54: * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] {
! 55: * at least one fragment of the indicated size is available
! 56: * }
! 57: *
! 58: * These tables are used by the scanc instruction on the VAX to
! 59: * quickly find an appropriate fragment.
! 60: */
! 61: const u_char fragtbl124[256] = {
! 62: 0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e,
! 63: 0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a,
! 64: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
! 65: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
! 66: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
! 67: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
! 68: 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
! 69: 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
! 70: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
! 71: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
! 72: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
! 73: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
! 74: 0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e,
! 75: 0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae,
! 76: 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
! 77: 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
! 78: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
! 79: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
! 80: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
! 81: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
! 82: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
! 83: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
! 84: 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
! 85: 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
! 86: 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
! 87: 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
! 88: 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
! 89: 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
! 90: 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
! 91: 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
! 92: 0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce,
! 93: 0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a,
! 94: };
! 95:
! 96: const u_char fragtbl8[256] = {
! 97: 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04,
! 98: 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
! 99: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
! 100: 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
! 101: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
! 102: 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
! 103: 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
! 104: 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
! 105: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
! 106: 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
! 107: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
! 108: 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
! 109: 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
! 110: 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
! 111: 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
! 112: 0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40,
! 113: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
! 114: 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
! 115: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
! 116: 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
! 117: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
! 118: 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
! 119: 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
! 120: 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
! 121: 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
! 122: 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
! 123: 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
! 124: 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12,
! 125: 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
! 126: 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c,
! 127: 0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c,
! 128: 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
! 129: };
! 130:
! 131: /*
! 132: * The actual fragtbl array.
! 133: */
! 134: const u_char *fragtbl[MAXFRAG + 1] = {
! 135: 0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8,
! 136: };
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