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  1. 24
    0
      LICENSE.TXT
  2. 0
    0
      README.md
  3. 62
    0
      mishmash.go
  4. 23
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      mishmash_test.go

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LICENSE.TXT Näytä tiedosto

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The MIT License (MIT)

Copyright (c) 2006-2019 MicroNeil Research Corporation and Contributors

All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.


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README.md Näytä tiedosto


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mishmash.go Näytä tiedosto

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// mishmash.go
// Copyright (C) 2021 MicroNeil Research Corporation.
//
// This software is released under the MIT license. See LICENSE.TXT.
//
// Mishamash is a non-cryptographic hash optimized for short strings.
package mishmash

var primes = [256]uint32{2781111551, 4115761697, 2188512439, 3902941499, 4078728127, 2919449173, 3950407729, 4081733563,
4061783399, 2728829231, 3557004557, 3778858159, 2397085727, 3808921189, 3159484147, 4084759639,
2938297727, 3839623429, 2441361773, 2471079053, 4270995293, 3336967261, 2717746523, 3306593077,
2846319523, 2704420699, 2772002447, 2664263209, 3452941517, 3422898851, 2502691043, 3785866613,
3164194337, 3348481009, 3448873073, 2340666883, 3742418039, 2298597811, 3061650257, 4286896921,
2816281231, 3814879819, 3245870963, 2718113173, 3051925081, 2527351147, 2737897993, 3567396421,
3422709179, 3542178331, 3740214493, 3720784621, 2821606727, 3764267237, 3923068349, 3880303043,
3816527917, 3032326837, 4006470463, 4165427173, 2511539731, 2993685649, 2268550831, 2899250059,
2432655553, 3959959639, 4142838449, 4100124029, 2962655827, 2648245423, 4117297801, 3331059481,
2287716593, 4115533181, 2411037073, 3273978871, 2395052183, 2776949353, 3871801559, 2948305931,
2257427881, 4288176181, 2624064151, 3144150523, 4282472071, 2206613407, 2960685401, 2761304627,
3187632967, 2447380627, 2781789473, 3657272401, 3603710699, 4042745507, 4087095841, 2354409557,
2239000559, 4164370321, 3636939347, 3622573529, 2202257819, 2792364713, 2803311809, 4006899277,
2835975767, 2951997809, 3185753917, 2417651723, 2631379747, 2175388331, 4277708983, 3547799261,
3093003779, 3653208029, 4084095199, 3161669417, 2698224923, 2746404013, 3209829191, 3024118079,
3799471327, 3012753409, 2653321639, 2777700139, 3794895031, 3075822329, 2774150557, 3135465059,
2294247001, 3557999149, 3189799397, 4080431539, 3397276529, 3931450153, 3518901437, 3135266501,
3275906693, 4143264221, 3439131923, 2462856037, 2441331799, 2640219781, 3504419027, 3721296989,
3434920081, 2852097271, 3199425679, 3785517557, 2984788193, 3678788947, 2308371491, 3354456173,
4148931503, 3239885063, 3894052103, 3930187787, 3521437319, 3203332001, 2894779337, 4197047957,
3080099353, 2304447583, 3731998477, 2733978179, 2235339121, 2490436339, 2147689987, 3276115639,
3923204273, 3402325321, 3082785493, 3420863399, 3203562407, 2292225781, 3461192447, 2589852949,
2772559931, 3667144931, 2163126419, 3412216831, 3699715037, 3619099453, 3875532569, 3047225267,
3780456941, 2512094297, 3527794547, 3130190737, 3013107347, 3691645577, 3877430399, 4270767517,
2797247227, 3976455169, 3541991143, 3737016677, 3801675821, 2233908737, 3210598117, 4200595549,
2772203789, 2415614503, 2467043143, 2611954561, 2791210277, 2599276769, 4034287091, 3521719193,
3060219497, 2799601709, 2178939557, 3800717749, 3426533269, 3519387097, 2861815447, 2884852603,
2814915449, 3359572921, 3013763303, 3565679363, 3491538893, 2588490083, 3441048649, 2501343701,
4191701149, 2251607773, 3543948791, 3511969763, 2966565907, 3640359409, 3640516129, 2586869203,
2328651011, 4037640461, 3601356797, 4260950119, 3198526459, 3478546597, 3009442531, 3594323353,
3205141207, 3592422991, 3357971081, 3217249313, 2903534827, 3716714951, 3388800011, 3045269987,
2325616213, 2688355151, 3022034467, 4221197753, 2426944493, 3090262709, 3471570467, 2437347167,
}

func slct(n uint64) uint32 {
return primes[n&0xff]
}

func engine(buffer []byte, length int) uint64 {
var accumulator uint64 = 0
for i := 0; i < length; i++ {
b := buffer[i]
accumulator += uint64(slct(accumulator)) + uint64(b)
accumulator *= uint64(slct(uint64(b)))
accumulator += accumulator >> 32

}
return accumulator
}

func Mishmash(buffer []byte) uint32 {
accumulator := engine(buffer, len(buffer))
return uint32(accumulator & 0x00000000ffffffff)
}

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mishmash_test.go Näytä tiedosto

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package mishmash

import (
"fmt"
"testing"
)

func TestMishmashString(t *testing.T) {
want := "9d923077"
if got := fmt.Sprintf("%08x", Mishmash([]byte("google.com"))); want != got {
t.Error("Parse() = got", got, "want", want)
} else {
fmt.Println("TestMishmashString passed")
}
}
func TestMishmashUint32(t *testing.T) {
var want uint32 = 2643603575
if got := Mishmash([]byte("google.com")); want != got {
t.Error("Parse() = got", got, "want", want)
} else {
fmt.Println("TestMishmashUint32 passed")
}
}

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