1 ! Copyright (C) 2018 John Benediktsson.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors alien.c-types alien.data byte-arrays checksums
4 combinators endian grouping kernel math math.bitwise sequences
6 SPECIALIZED-ARRAY: uint64_t
7 SPECIALIZED-ARRAY: uint32_t
8 SPECIALIZED-ARRAY: uint16_t
9 IN: checksums.metrohash
11 TUPLE: metrohash-64 seed ;
13 C: <metrohash-64> metrohash-64
17 :: native-mapper ( from to bytes c-type -- seq )
19 bytes byte-array? alien.data:little-endian? and
21 [ c-type heap-size <groups> [ le> ] map ] if ; inline
25 M:: metrohash-64 checksum-bytes ( bytes checksum -- value )
31 checksum seed>> :> seed
34 len dup 32 mod - :> len/32
35 len dup 16 mod - :> len/16
36 len dup 8 mod - :> len/8
37 len dup 4 mod - :> len/4
38 len dup 2 mod - :> len/2
42 h h h h :> ( v0! v1! v2! v3! )
45 0 len/32 bytes uint64_t native-mapper 4 <groups> [
47 [ k0 W* v0 W+ -29 bitroll-64 v2 W+ v0! ]
48 [ k1 W* v1 W+ -29 bitroll-64 v3 W+ v1! ]
49 [ k2 W* v2 W+ -29 bitroll-64 v0 W+ v2! ]
50 [ k3 W* v3 W+ -29 bitroll-64 v1 W+ v3! ]
54 v0 v3 W+ k0 W* v1 W+ -37 bitroll-64 k1 W* v2 bitxor v2!
55 v1 v2 W+ k1 W* v0 W+ -37 bitroll-64 k0 W* v3 bitxor v3!
56 v0 v2 W+ k0 W* v3 W+ -37 bitroll-64 k1 W* v0 bitxor v0!
57 v1 v3 W+ k1 W* v2 W+ -37 bitroll-64 k0 W* v1 bitxor v1!
62 len/32 len/16 bytes uint64_t native-mapper [
64 [ k2 W* v0 W+ -29 bitroll-64 k3 W* v1! ]
65 [ k2 W* v0 W+ -29 bitroll-64 k3 W* v2! ] bi*
66 v1 k0 W* -21 bitroll-64 v2 W+ v1 bitxor v1!
67 v2 k3 W* -21 bitroll-64 v1 W+ v2 bitxor v2!
71 len/16 len/8 bytes uint64_t native-mapper [
73 v0 -55 bitroll-64 k1 W* v0 bitxor v0!
76 len/8 len/4 bytes uint32_t native-mapper [
78 v0 -26 bitroll-64 k1 W* v0 bitxor v0!
81 len/4 len/2 bytes uint16_t native-mapper [
83 v0 -48 bitroll-64 k1 W* v0 bitxor v0!
86 bytes len/2 tail-slice [
88 v0 -37 bitroll-64 k1 W* v0 bitxor v0!
91 v0 -28 bitroll-64 v0 bitxor v0!
93 v0 -29 bitroll-64 v0 bitxor v0!
96 INSTANCE: metrohash-64 checksum
98 TUPLE: metrohash-128 seed ;
100 C: <metrohash-128> metrohash-128
102 M:: metrohash-128 checksum-bytes ( bytes checksum -- value )
108 checksum seed>> :> seed
111 len dup 32 mod - :> len/32
112 len dup 16 mod - :> len/16
113 len dup 8 mod - :> len/8
114 len dup 4 mod - :> len/4
115 len dup 2 mod - :> len/2
117 seed k0 W- k3 W* :> v0!
118 seed k1 W+ k2 W* :> v1!
119 seed k0 W+ k2 W* :> v2!
120 seed k1 W- k3 W* :> v3!
123 0 len/32 bytes uint64_t native-mapper 4 <groups> [
125 [ k0 W* v0 W+ -29 bitroll-64 v2 W+ v0! ]
126 [ k1 W* v1 W+ -29 bitroll-64 v3 W+ v1! ]
127 [ k2 W* v2 W+ -29 bitroll-64 v0 W+ v2! ]
128 [ k3 W* v3 W+ -29 bitroll-64 v1 W+ v3! ]
132 v0 v3 W+ k0 W* v1 W+ -21 bitroll-64 k1 W* v2 bitxor v2!
133 v1 v2 W+ k1 W* v0 W+ -21 bitroll-64 k0 W* v3 bitxor v3!
134 v0 v2 W+ k0 W* v3 W+ -21 bitroll-64 k1 W* v0 bitxor v0!
135 v1 v3 W+ k1 W* v2 W+ -21 bitroll-64 k0 W* v1 bitxor v1!
138 len/32 len/16 bytes uint64_t native-mapper [
140 [ k2 W* v0 W+ -33 bitroll-64 k3 W* v0! ]
141 [ k2 W* v1 W+ -33 bitroll-64 k3 W* v1! ] bi*
142 v0 k2 W* v1 W+ -45 bitroll-64 k1 W* v0 bitxor v0!
143 v1 k3 W* v0 W+ -45 bitroll-64 k0 W* v1 bitxor v1!
146 len/16 len/8 bytes uint64_t native-mapper [
147 first k2 W* v0 W+ -33 bitroll-64 k3 W* v0!
148 v0 k2 W* v1 W+ -27 bitroll-64 k1 W* v0 bitxor v0!
151 len/8 len/4 bytes uint32_t native-mapper [
152 first k2 W* v1 W+ -33 bitroll-64 k3 W* v1!
153 v1 k3 W* v0 W+ -46 bitroll-64 k0 W* v1 bitxor v1!
156 len/4 len/2 bytes uint16_t native-mapper [
157 first k2 W* v0 W+ -33 bitroll-64 k3 W* v0!
158 v0 k2 W* v1 W+ -22 bitroll-64 k1 W* v0 bitxor v0!
161 bytes len/2 tail-slice [
162 first k2 W* v1 W+ -33 bitroll-64 k3 W* v1!
163 v1 k3 W* v0 W+ -58 bitroll-64 k0 W* v1 bitxor v1!
166 v0 k0 W* v1 W+ -13 bitroll-64 v0 W+ v0!
167 v1 k1 W* v0 W+ -37 bitroll-64 v1 W+ v1!
168 v0 k2 W* v1 W+ -13 bitroll-64 v0 W+ v0!
169 v1 k3 W* v0 W+ -37 bitroll-64 v1 W+ v1!
173 INSTANCE: metrohash-128 checksum