mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-29 12:03:03 +00:00
138 lines
5.7 KiB
C
138 lines
5.7 KiB
C
/*
|
|
* 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
|
|
* $Id$
|
|
*/
|
|
|
|
#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.
|
|
*/
|
|
static 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,
|
|
};
|
|
|
|
static 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,
|
|
};
|