Commit | Line | Data |
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88a7a62a | 1 | /* ffs_tables.c 2.4 83/05/27 */ |
5576d804 KM |
2 | |
3 | #include "../h/param.h" | |
4 | ||
5576d804 | 5 | /* |
88a7a62a | 6 | * Bit patterns for identifying fragments in the block map |
5576d804 KM |
7 | * used as ((map & around) == inside) |
8 | */ | |
9 | int around[9] = { | |
10 | 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff | |
11 | }; | |
12 | int inside[9] = { | |
13 | 0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe | |
14 | }; | |
15 | ||
16 | /* | |
88a7a62a | 17 | * Given a block map bit pattern, the frag tables tell whether a |
5576d804 | 18 | * particular size fragment is available. |
b6407c9d | 19 | * |
5576d804 | 20 | * used as: |
b6407c9d | 21 | * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] { |
5576d804 KM |
22 | * at least one fragment of the indicated size is available |
23 | * } | |
b6407c9d KM |
24 | * |
25 | * These tables are used by the scanc instruction on the VAX to | |
5576d804 KM |
26 | * quickly find an appropriate fragment. |
27 | */ | |
88a7a62a | 28 | u_char fragtbl124[256] = { |
156b8f82 KM |
29 | 0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e, |
30 | 0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a, | |
31 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
32 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
33 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
34 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
35 | 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e, | |
36 | 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa, | |
37 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
38 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
39 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
40 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
41 | 0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e, | |
42 | 0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae, | |
43 | 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e, | |
44 | 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce, | |
45 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
46 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
47 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
48 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
49 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
50 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
51 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, | |
52 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe, | |
53 | 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e, | |
54 | 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa, | |
55 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, | |
56 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe, | |
57 | 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e, | |
58 | 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce, | |
59 | 0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce, | |
60 | 0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a, | |
5576d804 | 61 | }; |
5576d804 | 62 | |
88a7a62a | 63 | u_char fragtbl8[256] = { |
5576d804 KM |
64 | 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04, |
65 | 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08, | |
66 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
67 | 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10, | |
68 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
69 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
70 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, | |
71 | 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20, | |
72 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
73 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
74 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
75 | 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, | |
76 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, | |
77 | 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a, | |
78 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, | |
79 | 0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40, | |
80 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
81 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
82 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
83 | 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, | |
84 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
85 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
86 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, | |
87 | 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21, | |
88 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, | |
89 | 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a, | |
90 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, | |
91 | 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12, | |
92 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, | |
93 | 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c, | |
94 | 0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c, | |
95 | 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80, | |
96 | }; | |
b6407c9d KM |
97 | |
98 | /* | |
88a7a62a | 99 | * The actual fragtbl array. |
b6407c9d | 100 | */ |
88a7a62a | 101 | u_char *fragtbl[MAXFRAG + 1] = { |
156b8f82 | 102 | 0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8, |
b6407c9d | 103 | }; |