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 grouping io.binary kernel locals math math.bitwise
5 sequences specialized-arrays ;
6 SPECIALIZED-ARRAY: uint64_t
7 SPECIALIZED-ARRAY: uint32_t
8 SPECIALIZED-ARRAY: uint16_t
9 SPECIALIZED-ARRAY: uint8_t
11 IN: checksums.metrohash
13 TUPLE: metrohash-64 seed ;
15 C: <metrohash-64> metrohash-64
19 :: native-mapper ( from to bytes c-type -- seq )
21 bytes byte-array? little-endian? and
23 [ c-type heap-size <groups> [ le> ] map ] if ; inline
27 M:: metrohash-64 checksum-bytes ( bytes checksum -- value )
33 checksum seed>> :> seed
36 len dup 32 mod - :> len/32
37 len dup 16 mod - :> len/16
38 len dup 8 mod - :> len/8
39 len dup 4 mod - :> len/4
40 len dup 2 mod - :> len/2
44 h h h h :> ( v0! v1! v2! v3! )
47 0 len/32 bytes uint64_t native-mapper 4 <groups> [
49 [ k0 W* v0 W+ -29 bitroll-64 v2 W+ v0! ]
50 [ k1 W* v1 W+ -29 bitroll-64 v3 W+ v1! ]
51 [ k2 W* v2 W+ -29 bitroll-64 v0 W+ v2! ]
52 [ k3 W* v3 W+ -29 bitroll-64 v1 W+ v3! ]
56 v0 v3 W+ k0 W* v1 W+ -37 bitroll-64 k1 W* v2 bitxor v2!
57 v1 v2 W+ k1 W* v0 W+ -37 bitroll-64 k0 W* v3 bitxor v3!
58 v0 v2 W+ k0 W* v3 W+ -37 bitroll-64 k1 W* v0 bitxor v0!
59 v1 v3 W+ k1 W* v2 W+ -37 bitroll-64 k0 W* v1 bitxor v1!
64 len/32 len/16 bytes uint64_t native-mapper [
66 [ k2 W* v0 W+ -29 bitroll-64 k3 W* v1! ]
67 [ k2 W* v0 W+ -29 bitroll-64 k3 W* v2! ] bi*
68 v1 k0 W* -21 bitroll-64 v2 W+ v1 bitxor v1!
69 v2 k3 W* -21 bitroll-64 v1 W+ v2 bitxor v2!
73 len/16 len/8 bytes uint64_t native-mapper [
75 v0 -55 bitroll-64 k1 W* v0 bitxor v0!
78 len/8 len/4 bytes uint32_t native-mapper [
80 v0 -26 bitroll-64 k1 W* v0 bitxor v0!
83 len/4 len/2 bytes uint16_t native-mapper [
85 v0 -48 bitroll-64 k1 W* v0 bitxor v0!
88 bytes len/2 tail-slice [
90 v0 -37 bitroll-64 k1 W* v0 bitxor v0!
93 v0 -28 bitroll-64 v0 bitxor v0!
95 v0 -29 bitroll-64 v0 bitxor v0!
98 INSTANCE: metrohash-64 checksum
100 TUPLE: metrohash-128 seed ;
102 C: <metrohash-128> metrohash-128
104 M:: metrohash-128 checksum-bytes ( bytes checksum -- value )
110 checksum seed>> :> seed
113 len dup 32 mod - :> len/32
114 len dup 16 mod - :> len/16
115 len dup 8 mod - :> len/8
116 len dup 4 mod - :> len/4
117 len dup 2 mod - :> len/2
119 seed k0 W- k3 W* :> v0!
120 seed k1 W+ k2 W* :> v1!
121 seed k0 W+ k2 W* :> v2!
122 seed k1 W- k3 W* :> v3!
125 0 len/32 bytes uint64_t native-mapper 4 <groups> [
127 [ k0 W* v0 W+ -29 bitroll-64 v2 W+ v0! ]
128 [ k1 W* v1 W+ -29 bitroll-64 v3 W+ v1! ]
129 [ k2 W* v2 W+ -29 bitroll-64 v0 W+ v2! ]
130 [ k3 W* v3 W+ -29 bitroll-64 v1 W+ v3! ]
134 v0 v3 W+ k0 W* v1 W+ -21 bitroll-64 k1 W* v2 bitxor v2!
135 v1 v2 W+ k1 W* v0 W+ -21 bitroll-64 k0 W* v3 bitxor v3!
136 v0 v2 W+ k0 W* v3 W+ -21 bitroll-64 k1 W* v0 bitxor v0!
137 v1 v3 W+ k1 W* v2 W+ -21 bitroll-64 k0 W* v1 bitxor v1!
140 len/32 len/16 bytes uint64_t native-mapper [
142 [ k2 W* v0 W+ -33 bitroll-64 k3 W* v0! ]
143 [ k2 W* v1 W+ -33 bitroll-64 k3 W* v1! ] bi*
144 v0 k2 W* v1 W+ -45 bitroll-64 k1 W* v0 bitxor v0!
145 v1 k3 W* v0 W+ -45 bitroll-64 k0 W* v1 bitxor v1!
148 len/16 len/8 bytes uint64_t native-mapper [
149 first k2 W* v0 W+ -33 bitroll-64 k3 W* v0!
150 v0 k2 W* v1 W+ -27 bitroll-64 k1 W* v0 bitxor v0!
153 len/8 len/4 bytes uint32_t native-mapper [
154 first k2 W* v1 W+ -33 bitroll-64 k3 W* v1!
155 v1 k3 W* v0 W+ -46 bitroll-64 k0 W* v1 bitxor v1!
158 len/4 len/2 bytes uint16_t native-mapper [
159 first k2 W* v0 W+ -33 bitroll-64 k3 W* v0!
160 v0 k2 W* v1 W+ -22 bitroll-64 k1 W* v0 bitxor v0!
163 bytes len/2 tail-slice [
164 first k2 W* v1 W+ -33 bitroll-64 k3 W* v1!
165 v1 k3 W* v0 W+ -58 bitroll-64 k0 W* v1 bitxor v1!
168 v0 k0 W* v1 W+ -13 bitroll-64 v0 W+ v0!
169 v1 k1 W* v0 W+ -37 bitroll-64 v1 W+ v1!
170 v0 k2 W* v1 W+ -13 bitroll-64 v0 W+ v0!
171 v1 k3 W* v0 W+ -37 bitroll-64 v1 W+ v1!
175 INSTANCE: metrohash-128 checksum