Initial revision

1 files changed, 122 insertions, 0 deletions

diff --git a/ufs/tables.c b/ufs/tables.c
new file mode 100644
index 00000000..42badaed
--- /dev/null
+++ b/ufs/tables.c
@@ -0,0 +1,122 @@
+/* Tables for fast computation */
+/*
+ * Copyright (c) 1982, 1986 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution is only permitted until one year after the first shipment
+ * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
+ * binary forms are permitted provided that: (1) source distributions retain
+ * this entire copyright notice and comment, and (2) distributions including
+ * binaries display the following acknowledgement:  This product includes
+ * software developed by the University of California, Berkeley and its
+ * contributors'' in the documentation or other materials provided with the
+ * distribution and in all advertising materials mentioning features or use
+ * of this software.  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 AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *	@(#)ufs_tables.c	7.4 (Berkeley) 6/28/90
+ */
+
+/*
+ * 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,
+};