Geant4 Cross Reference |
1 // 1 2 // ******************************************* 3 // * License and Disclaimer 4 // * 5 // * The Geant4 software is copyright of th 6 // * the Geant4 Collaboration. It is provided 7 // * conditions of the Geant4 Software License 8 // * LICENSE and available at http://cern.ch/ 9 // * include a list of copyright holders. 10 // * 11 // * Neither the authors of this software syst 12 // * institutes,nor the agencies providing fin 13 // * work make any representation or warran 14 // * regarding this software system or assum 15 // * use. Please see the license in the file 16 // * for the full disclaimer and the limitatio 17 // * 18 // * This code implementation is the result 19 // * technical work of the GEANT4 collaboratio 20 // * By using, copying, modifying or distri 21 // * any work based on the software) you ag 22 // * use in resulting scientific publicati 23 // * acceptance of all terms of the Geant4 Sof 24 // ******************************************* 25 // 26 // 27 // G4Hashing.cc 28 // Geant4 29 // 30 // Created by Mathieu Karamitros 31 // 32 // 33 34 #include "DNAHashing.hh" 35 36 //....oooOO0OOooo........oooOO0OOooo........oo 37 38 namespace G4::hashing 39 { 40 namespace crc32 41 { 42 uint32_t Hash(const char* str, size_t len) 43 { 44 uint32_t remainder = 0xFFFFFFFF; 45 for (size_t idx = 0; idx < len; ++idx) { 46 remainder = (remainder >> 8) ^ fCrc_table[ 47 } 48 return remainder ^ 0xFFFFFFFF; 49 } 50 51 uint32_t Hash(const std::string& str) 52 { 53 return Hash(str.c_str(), str.size()); 54 } 55 } // namespace crc32 56 57 namespace fnv 58 { 59 size_t Hash(const std::string& str) 60 { 61 size_t hash = fnv_offset_basis; 62 for (size_t i = 0; i < str.length(); i++) { 63 hash = hash ^ (str[i]); // xor the low 8 64 hash = hash * fnv_prime; // multiply by t 65 } 66 return hash; 67 } 68 } // namespace fnv 69 70 namespace larson 71 { 72 size_t Hash(const char* str, unsigned int seed 73 { 74 size_t hash = seed; 75 while (*str != 0) { 76 hash = hash * 101 + *str++; 77 } 78 return hash; 79 } 80 81 size_t Hash(std::string str, unsigned int seed 82 { 83 return Hash(str.c_str(), seed); 84 } 85 } // namespace larson 86 } // namespace G4::hashing 87 88 //....oooOO0OOooo........oooOO0OOooo........oo 89