Quelle  city_test.cc

// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "absl/hash/internal/city.h"

#include <string.h>
#include <cstdio>
#include <iostream>
#include "gtest/gtest.h"

namespace absl {
ABSL_NAMESPACE_BEGIN
namespace hash_internal {
namespace {

static const uint64_t k0 = 0xc3a5c85c97cb3127ULL;
static const uint64_t kSeed0 = 1234567;
static const uint64_t kSeed1 = k0;
static const int kDataSize = 1 << 20;
static const int kTestSize = 300;

static char data[kDataSize];

// Initialize data to pseudorandom values.
void setup() {
  uint64_t a = 9;
  uint64_t b = 777;
  for (int i = 0; i < kDataSize; i++) {
    a += b;
    b += a;
    a = (a ^ (a >> 41)) * k0;
    b = (b ^ (b >> 41)) * k0 + i;
    uint8_t u = b >> 37;
    memcpy(data + i, &u, 1);  // uint8_t -> char
  }
}

#define C(x) 0x##x##ULL
static const uint64_t testdata[kTestSize][4] = {
    {C(9ae16a3b2f90404f), C(75106db890237a4a), C(3feac5f636039766),
     C(dc56d17a)},
    {C(541150e87f415e96), C(1aef0d24b3148a1a), C(bacc300e1e82345a),
     C(99929334)},
    {C(f3786a4b25827c1), C(34ee1a2bf767bd1c), C(2f15ca2ebfb631f2), C(4252edb7)},
    {C(ef923a7a1af78eab), C(79163b1e1e9a9b18), C(df3b2aca6e1e4a30),
     C(ebc34f3c)},
    {C(11df592596f41d88), C(843ec0bce9042f9c), C(cce2ea1e08b1eb30),
     C(26f2b463)},
    {C(831f448bdc5600b3), C(62a24be3120a6919), C(1b44098a41e010da),
     C(b042c047)},
    {C(3eca803e70304894), C(d80de767e4a920a), C(a51cfbb292efd53d), C(e73bb0a8)},
    {C(1b5a063fb4c7f9f1), C(318dbc24af66dee9), C(10ef7b32d5c719af),
     C(91dfdd75)},
    {C(a0f10149a0e538d6), C(69d008c20f87419f), C(41b36376185b3e9e),
     C(c87f95de)},
    {C(fb8d9c70660b910b), C(a45b0cc3476bff1b), C(b28d1996144f0207),
     C(3f5538ef)},
    {C(236827beae282a46), C(e43970221139c946), C(4f3ac6faa837a3aa),
     C(70eb1a1f)},
    {C(c385e435136ecf7c), C(d9d17368ff6c4a08), C(1b31eed4e5251a67),
     C(cfd63b83)},
    {C(e3f6828b6017086d), C(21b4d1900554b3b0), C(bef38be1809e24f1),
     C(894a52ef)},
    {C(851fff285561dca0), C(4d1277d73cdf416f), C(28ccffa61010ebe2),
     C(9cde6a54)},
    {C(61152a63595a96d9), C(d1a3a91ef3a7ba45), C(443b6bb4a493ad0c),
     C(6c4898d5)},
    {C(44473e03be306c88), C(30097761f872472a), C(9fd1b669bfad82d7),
     C(13e1978e)},
    {C(3ead5f21d344056), C(fb6420393cfb05c3), C(407932394cbbd303), C(51b4ba8)},
    {C(6abbfde37ee03b5b), C(83febf188d2cc113), C(cda7b62d94d5b8ee),
     C(b6b06e40)},
    {C(943e7ed63b3c080), C(1ef207e9444ef7f8), C(ef4a9f9f8c6f9b4a), C(240a2f2)},
    {C(d72ce05171ef8a1a), C(c6bd6bd869203894), C(c760e6396455d23a),
     C(5dcefc30)},
    {C(4182832b52d63735), C(337097e123eea414), C(b5a72ca0456df910),
     C(7a48b105)},
    {C(d6cdae892584a2cb), C(58de0fa4eca17dcd), C(43df30b8f5f1cb00),
     C(fd55007b)},
    {C(5c8e90bc267c5ee4), C(e9ae044075d992d9), C(f234cbfd1f0a1e59),
     C(6b95894c)},
    {C(bbd7f30ac310a6f3), C(b23b570d2666685f), C(fb13fb08c9814fe7),
     C(3360e827)},
    {C(36a097aa49519d97), C(8204380a73c4065), C(77c2004bdd9e276a), C(45177e0b)},
    {C(dc78cb032c49217), C(112464083f83e03a), C(96ae53e28170c0f5), C(7c6fffe4)},
    {C(441593e0da922dfe), C(936ef46061469b32), C(204a1921197ddd87),
     C(bbc78da4)},
    {C(2ba3883d71cc2133), C(72f2bbb32bed1a3c), C(27e1bd96d4843251),
     C(c5c25d39)},
    {C(f2b6d2adf8423600), C(7514e2f016a48722), C(43045743a50396ba),
     C(b6e5d06e)},
    {C(38fffe7f3680d63c), C(d513325255a7a6d1), C(31ed47790f6ca62f),
     C(6178504e)},
    {C(b7477bf0b9ce37c6), C(63b1c580a7fd02a4), C(f6433b9f10a5dac), C(bd4c3637)},
    {C(55bdb0e71e3edebd), C(c7ab562bcf0568bc), C(43166332f9ee684f),
     C(6e7ac474)},
    {C(782fa1b08b475e7), C(fb7138951c61b23b), C(9829105e234fb11e), C(1fb4b518)},
    {C(c5dc19b876d37a80), C(15ffcff666cfd710), C(e8c30c72003103e2),
     C(31d13d6d)},
    {C(5e1141711d2d6706), C(b537f6dee8de6933), C(3af0a1fbbe027c54),
     C(26fa72e3)},
    {C(782edf6da001234f), C(f48cbd5c66c48f3), C(808754d1e64e2a32), C(6a7433bf)},
    {C(d26285842ff04d44), C(8f38d71341eacca9), C(5ca436f4db7a883c),
     C(4e6df758)},
    {C(c6ab830865a6bae6), C(6aa8e8dd4b98815c), C(efe3846713c371e5),
     C(d57f63ea)},
    {C(44b3a1929232892), C(61dca0e914fc217), C(a607cc142096b964), C(52ef73b3)},
    {C(4b603d7932a8de4f), C(fae64c464b8a8f45), C(8fafab75661d602a), C(3cb36c3)},
    {C(4ec0b54cf1566aff), C(30d2c7269b206bf4), C(77c22e82295e1061),
     C(72c39bea)},
    {C(ed8b7a4b34954ff7), C(56432de31f4ee757), C(85bd3abaa572b155),
     C(a65aa25c)},
    {C(5d28b43694176c26), C(714cc8bc12d060ae), C(3437726273a83fe6),
     C(74740539)},
    {C(6a1ef3639e1d202e), C(919bc1bd145ad928), C(30f3f7e48c28a773),
     C(c3ae3c26)},
    {C(159f4d9e0307b111), C(3e17914a5675a0c), C(af849bd425047b51), C(f29db8a2)},
    {C(cc0a840725a7e25b), C(57c69454396e193a), C(976eaf7eee0b4540),
     C(1ef4cbf4)},
    {C(a2b27ee22f63c3f1), C(9ebde0ce1b3976b2), C(2fe6a92a257af308),
     C(a9be6c41)},
    {C(d8f2f234899bcab3), C(b10b037297c3a168), C(debea2c510ceda7f), C(fa31801)},
    {C(584f28543864844f), C(d7cee9fc2d46f20d), C(a38dca5657387205),
     C(8331c5d8)},
    {C(a94be46dd9aa41af), C(a57e5b7723d3f9bd), C(34bf845a52fd2f), C(e9876db8)},
    {C(9a87bea227491d20), C(a468657e2b9c43e7), C(af9ba60db8d89ef7),
     C(27b0604e)},
    {C(27688c24958d1a5c), C(e3b4a1c9429cf253), C(48a95811f70d64bc),
     C(dcec07f2)},
    {C(5d1d37790a1873ad), C(ed9cd4bcc5fa1090), C(ce51cde05d8cd96a),
     C(cff0a82a)},
    {C(1f03fd18b711eea9), C(566d89b1946d381a), C(6e96e83fc92563ab),
     C(fec83621)},
    {C(f0316f286cf527b6), C(f84c29538de1aa5a), C(7612ed3c923d4a71), C(743d8dc)},
    {C(297008bcb3e3401d), C(61a8e407f82b0c69), C(a4a35bff0524fa0e),
     C(64d41d26)},
    {C(43c6252411ee3be), C(b4ca1b8077777168), C(2746dc3f7da1737f), C(acd90c81)},
    {C(ce38a9a54fad6599), C(6d6f4a90b9e8755e), C(c3ecc79ff105de3f),
     C(7c746a4b)},
    {C(270a9305fef70cf), C(600193999d884f3a), C(f4d49eae09ed8a1), C(b1047e99)},
    {C(e71be7c28e84d119), C(eb6ace59932736e6), C(70c4397807ba12c5),
     C(d1fd1068)},
    {C(b5b58c24b53aaa19), C(d2a6ab0773dd897f), C(ef762fe01ecb5b97),
     C(56486077)},
    {C(44dd59bd301995cf), C(3ccabd76493ada1a), C(540db4c87d55ef23),
     C(6069be80)},
    {C(b4d4789eb6f2630b), C(bf6973263ce8ef0e), C(d1c75c50844b9d3), C(2078359b)},
    {C(12807833c463737c), C(58e927ea3b3776b4), C(72dd20ef1c2f8ad0),
     C(9ea21004)},
    {C(e88419922b87176f), C(bcf32f41a7ddbf6f), C(d6ebefd8085c1a0f),
     C(9c9cfe88)},
    {C(105191e0ec8f7f60), C(5918dbfcca971e79), C(6b285c8a944767b9),
     C(b70a6ddd)},
    {C(a5b88bf7399a9f07), C(fca3ddfd96461cc4), C(ebe738fdc0282fc6),
     C(dea37298)},
    {C(d08c3f5747d84f50), C(4e708b27d1b6f8ac), C(70f70fd734888606),
     C(8f480819)},
    {C(2f72d12a40044b4b), C(889689352fec53de), C(f03e6ad87eb2f36), C(30b3b16)},
    {C(aa1f61fdc5c2e11e), C(c2c56cd11277ab27), C(a1e73069fdf1f94f),
     C(f31bc4e8)},
    {C(9489b36fe2246244), C(3355367033be74b8), C(5f57c2277cbce516),
     C(419f953b)},
    {C(358d7c0476a044cd), C(e0b7b47bcbd8854f), C(ffb42ec696705519),
     C(20e9e76d)},
    {C(b0c48df14275265a), C(9da4448975905efa), C(d716618e414ceb6d),
     C(646f0ff8)},
    {C(daa70bb300956588), C(410ea6883a240c6d), C(f5c8239fb5673eb3),
     C(eeb7eca8)},
    {C(4ec97a20b6c4c7c2), C(5913b1cd454f29fd), C(a9629f9daf06d685), C(8112bb9)},
    {C(5c3323628435a2e8), C(1bea45ce9e72a6e3), C(904f0a7027ddb52e),
     C(85a6d477)},
    {C(c1ef26bea260abdb), C(6ee423f2137f9280), C(df2118b946ed0b43),
     C(56f76c84)},
    {C(6be7381b115d653a), C(ed046190758ea511), C(de6a45ffc3ed1159),
     C(9af45d55)},
    {C(ae3eece1711b2105), C(14fd3f4027f81a4a), C(abb7e45177d151db),
     C(d1c33760)},
    {C(376c28588b8fb389), C(6b045e84d8491ed2), C(4e857effb7d4e7dc),
     C(c56bbf69)},
    {C(58d943503bb6748f), C(419c6c8e88ac70f6), C(586760cbf3d3d368),
     C(abecfb9b)},
    {C(dfff5989f5cfd9a1), C(bcee2e7ea3a96f83), C(681c7874adb29017),
     C(8de13255)},
    {C(7fb19eb1a496e8f5), C(d49e5dfdb5c0833f), C(c0d5d7b2f7c48dc7),
     C(a98ee299)},
    {C(5dba5b0dadccdbaa), C(4ba8da8ded87fcdc), C(f693fdd25badf2f0),
     C(3015f556)},
    {C(688bef4b135a6829), C(8d31d82abcd54e8e), C(f95f8a30d55036d7),
     C(5a430e29)},
    {C(d8323be05433a412), C(8d48fa2b2b76141d), C(3d346f23978336a5),
     C(2797add0)},
    {C(3b5404278a55a7fc), C(23ca0b327c2d0a81), C(a6d65329571c892c),
     C(27d55016)},
    {C(2a96a3f96c5e9bbc), C(8caf8566e212dda8), C(904de559ca16e45e),
     C(84945a82)},
    {C(22bebfdcc26d18ff), C(4b4d8dcb10807ba1), C(40265eee30c6b896),
     C(3ef7e224)},
    {C(627a2249ec6bbcc2), C(c0578b462a46735a), C(4974b8ee1c2d4f1f),
     C(35ed8dc8)},
    {C(3abaf1667ba2f3e0), C(ee78476b5eeadc1), C(7e56ac0a6ca4f3f4), C(6a75e43d)},
    {C(3931ac68c5f1b2c9), C(efe3892363ab0fb0), C(40b707268337cd36),
     C(235d9805)},
    {C(b98fb0606f416754), C(46a6e5547ba99c1e), C(c909d82112a8ed2), C(f7d69572)},
    {C(7f7729a33e58fcc4), C(2e4bc1e7a023ead4), C(e707008ea7ca6222),
     C(bacd0199)},
    {C(42a0aa9ce82848b3), C(57232730e6bee175), C(f89bb3f370782031),
     C(e428f50e)},
    {C(6b2c6d38408a4889), C(de3ef6f68fb25885), C(20754f456c203361),
     C(81eaaad3)},
    {C(930380a3741e862a), C(348d28638dc71658), C(89dedcfd1654ea0d),
     C(addbd3e3)},
    {C(94808b5d2aa25f9a), C(cec72968128195e0), C(d9f4da2bdc1e130f),
     C(e66dbca0)},
    {C(b31abb08ae6e3d38), C(9eb9a95cbd9e8223), C(8019e79b7ee94ea9),
     C(afe11fd5)},
    {C(dccb5534a893ea1a), C(ce71c398708c6131), C(fe2396315457c164),
     C(a71a406f)},
    {C(6369163565814de6), C(8feb86fb38d08c2f), C(4976933485cc9a20),
     C(9d90eaf5)},
    {C(edee4ff253d9f9b3), C(96ef76fb279ef0ad), C(a4d204d179db2460),
     C(6665db10)},
    {C(941993df6e633214), C(929bc1beca5b72c6), C(141fc52b8d55572d),
     C(9c977cbf)},
    {C(859838293f64cd4c), C(484403b39d44ad79), C(bf674e64d64b9339),
     C(ee83ddd4)},
    {C(c19b5648e0d9f555), C(328e47b2b7562993), C(e756b92ba4bd6a51), C(26519cc)},
    {C(f963b63b9006c248), C(9e9bf727ffaa00bc), C(c73bacc75b917e3a),
     C(a485a53f)},
    {C(6a8aa0852a8c1f3b), C(c8f1e5e206a21016), C(2aa554aed1ebb524),
     C(f62bc412)},
    {C(740428b4d45e5fb8), C(4c95a4ce922cb0a5), C(e99c3ba78feae796),
     C(8975a436)},
    {C(658b883b3a872b86), C(2f0e303f0f64827a), C(975337e23dc45e1), C(94ff7f41)},
    {C(6df0a977da5d27d4), C(891dd0e7cb19508), C(fd65434a0b71e680), C(760aa031)},
    {C(a900275464ae07ef), C(11f2cfda34beb4a3), C(9abf91e5a1c38e4), C(3bda76df)},
    {C(810bc8aa0c40bcb0), C(448a019568d01441), C(f60ec52f60d3aeae),
     C(498e2e65)},
    {C(22036327deb59ed7), C(adc05ceb97026a02), C(48bff0654262672b),
     C(d38deb48)},
    {C(7d14dfa9772b00c8), C(595735efc7eeaed7), C(29872854f94c3507),
     C(82b3fb6b)},
    {C(2d777cddb912675d), C(278d7b10722a13f9), C(f5c02bfb7cc078af),
     C(e500e25f)},
    {C(f2ec98824e8aa613), C(5eb7e3fb53fe3bed), C(12c22860466e1dd4),
     C(bd2bb07c)},
    {C(5e763988e21f487f), C(24189de8065d8dc5), C(d1519d2403b62aa0),
     C(3a2b431d)},
    {C(48949dc327bb96ad), C(e1fd21636c5c50b4), C(3f6eb7f13a8712b4),
     C(7322a83d)},
    {C(b7c4209fb24a85c5), C(b35feb319c79ce10), C(f0d3de191833b922),
     C(a645ca1c)},
    {C(9c9e5be0943d4b05), C(b73dc69e45201cbb), C(aab17180bfe5083d),
     C(8909a45a)},
    {C(3898bca4dfd6638d), C(f911ff35efef0167), C(24bdf69e5091fc88),
     C(bd30074c)},
    {C(5b5d2557400e68e7), C(98d610033574cee), C(dfd08772ce385deb), C(c17cf001)},
    {C(a927ed8b2bf09bb6), C(606e52f10ae94eca), C(71c2203feb35a9ee),
     C(26ffd25a)},
    {C(8d25746414aedf28), C(34b1629d28b33d3a), C(4d5394aea5f82d7b),
     C(f1d8ce3c)},
    {C(b5bbdb73458712f2), C(1ff887b3c2a35137), C(7f7231f702d0ace9),
     C(3ee8fb17)},
    {C(3d32a26e3ab9d254), C(fc4070574dc30d3a), C(f02629579c2b27c9),
     C(a77acc2a)},
    {C(9371d3c35fa5e9a5), C(42967cf4d01f30), C(652d1eeae704145c), C(f4556dee)},
    {C(cbaa3cb8f64f54e0), C(76c3b48ee5c08417), C(9f7d24e87e61ce9), C(de287a64)},
    {C(b2e23e8116c2ba9f), C(7e4d9c0060101151), C(3310da5e5028f367),
     C(878e55b9)},
    {C(8aa77f52d7868eb9), C(4d55bd587584e6e2), C(d2db37041f495f5), C(7648486)},
    {C(858fea922c7fe0c3), C(cfe8326bf733bc6f), C(4e5e2018cf8f7dfc),
     C(57ac0fb1)},
    {C(46ef25fdec8392b1), C(e48d7b6d42a5cd35), C(56a6fe1c175299ca),
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     C(6aa75624)},
    {C(8ca92c7cd39fae5d), C(317e620e1bf20f1), C(4f0b33bf2194b97f), C(602a3f96)},
    {C(fdde3b03f018f43e), C(38f932946c78660), C(c84084ce946851ee), C(cd183c4d)},
    {C(9c8502050e9c9458), C(d6d2a1a69964beb9), C(1675766f480229b5),
     C(960a4d07)},
    {C(348176ca2fa2fdd2), C(3a89c514cc360c2d), C(9f90b8afb318d6d0),
     C(9ae998c4)},
    {C(4a3d3dfbbaea130b), C(4e221c920f61ed01), C(553fd6cd1304531f),
     C(74e2179d)},
    {C(b371f768cdf4edb9), C(bdef2ace6d2de0f0), C(e05b4100f7f1baec),
     C(ee9bae25)},
    {C(7a1d2e96934f61f), C(eb1760ae6af7d961), C(887eb0da063005df), C(b66edf10)},
    {C(8be53d466d4728f2), C(86a5ac8e0d416640), C(984aa464cdb5c8bb),
     C(d6209737)},
    {C(829677eb03abf042), C(43cad004b6bc2c0), C(f2f224756803971a), C(b994a88)},
    {C(754435bae3496fc), C(5707fc006f094dcf), C(8951c86ab19d8e40), C(a05d43c0)},
    {C(fda9877ea8e3805f), C(31e868b6ffd521b7), C(b08c90681fb6a0fd),
     C(c79f73a8)},
    {C(2e36f523ca8f5eb5), C(8b22932f89b27513), C(331cd6ecbfadc1bb),
     C(a490aff5)},
    {C(21a378ef76828208), C(a5c13037fa841da2), C(506d22a53fbe9812),
     C(dfad65b4)},
    {C(ccdd5600054b16ca), C(f78846e84204cb7b), C(1f9faec82c24eac9), C(1d07dfb)},
    {C(7854468f4e0cabd0), C(3a3f6b4f098d0692), C(ae2423ec7799d30d),
     C(416df9a0)},
    {C(7f88db5346d8f997), C(88eac9aacc653798), C(68a4d0295f8eefa1),
     C(1f8fb9cc)},
    {C(bb3fb5fb01d60fcf), C(1b7cc0847a215eb6), C(1246c994437990a1),
     C(7abf48e3)},
    {C(2e783e1761acd84d), C(39158042bac975a0), C(1cd21c5a8071188d),
     C(dea4e3dd)},
    {C(392058251cf22acc), C(944ec4475ead4620), C(b330a10b5cb94166),
     C(c6064f22)},
    {C(adf5c1e5d6419947), C(2a9747bc659d28aa), C(95c5b8cb1f5d62c), C(743bed9c)},
    {C(6bc1db2c2bee5aba), C(e63b0ed635307398), C(7b2eca111f30dbbc),
     C(fce254d5)},
    {C(b00f898229efa508), C(83b7590ad7f6985c), C(2780e70a0592e41d),
     C(e47ec9d1)},
    {C(b56eb769ce0d9a8c), C(ce196117bfbcaf04), C(b26c3c3797d66165),
     C(334a145c)},
    {C(70c0637675b94150), C(259e1669305b0a15), C(46e1dd9fd387a58d),
     C(adec1e3c)},
    {C(74c0b8a6821faafe), C(abac39d7491370e7), C(faf0b2a48a4e6aed),
     C(f6a9fbf8)},
    {C(5fb5e48ac7b7fa4f), C(a96170f08f5acbc7), C(bbf5c63d4f52a1e5),
     C(5398210c)},
};

void TestUnchanging(const uint64_t* expected, int offset, int len) {
  EXPECT_EQ(expected[0], CityHash64(data + offset, len));
  EXPECT_EQ(expected[3], CityHash32(data + offset, len));
  EXPECT_EQ(expected[1], CityHash64WithSeed(data + offset, len, kSeed0));
  EXPECT_EQ(expected[2],
            CityHash64WithSeeds(data + offset, len, kSeed0, kSeed1));
}

TEST(CityHashTest, Unchanging) {
  setup();
  int i = 0;
  for (; i < kTestSize - 1; i++) {
    TestUnchanging(testdata[i], i * i, i);
  }
  TestUnchanging(testdata[i], 0, kDataSize);
}

}  // namespace
}  // namespace hash_internal
ABSL_NAMESPACE_END
}  // namespace absl