bloom_filter_example03.cpp File Reference

#include <iostream>
#include <cstddef>
#include <cstdio>
#include <fstream>
#include <iterator>
#include <algorithm>
#include <vector>
#include <deque>
#include <set>
#include <string>
#include "bloom_filter.hpp"

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Functions
bool	load_word_list (int argc, char *argv[], std::vector< std::string > &word_list)
template<class T , class Allocator , template< class, class > class Container>
bool	read_file (const std::string &file_name, Container< T, Allocator > &c)
void	generate_outliers (const std::vector< std::string > &word_list, std::deque< std::string > &outliers)
void	purify_outliers (const std::vector< std::string > &word_list, std::deque< std::string > &outliers)
int	main (int argc, char *argv[])
std::string	reverse (std::string str)

Function Documentation

generate_outliers()

void generate_outliers	(	const std::vector< std::string > &	word_list,
		std::deque< std::string > &	outliers
	)

Definition at line 201 of file bloom_filter_example03.cpp.

References purify_outliers(), and reverse().

Referenced by main().

{
   std::cout << "Generating outliers..... ";

   for (std::vector<std::string>::const_iterator it = word_list.begin(); it != word_list.end(); ++it)
   {
      if ((*it) != reverse((*it)))
      {
         outliers.push_back((*it) + reverse((*it)));
         outliers.push_back((*it) + (*it));
         outliers.push_back(reverse((*it)) + (*it) + reverse((*it)));
      }

      std::string ns = *it;

      for (unsigned int i = 0; i < ns.size(); ++i)
      {
         if (1 == (i & 0x00)) ns[i] = ~ns[i];
      }

      outliers.push_back(ns);
   }

   static const std::string rand_str[] =
                  {
                     "oD5l", "pccW", "5yHt", "ndaN", "OaJh", "tWPc", "Cr9C", "a9zE",
                     "H1wL", "yo1V", "16D7", "f2WR", "0MVQ", "PkKn", "PlVa", "MvzL",
                     "9Csl", "JQTv", "IveD", "FDVS", "Q7HE", "QgcF", "Q9Vo", "V8zJ",
                     "EJWT", "GuLC", "rM3d", "PJF4", "HXPW", "qKx3", "ztRP", "t4KP",
                     "m1zV", "fn12", "B1QP", "Jr4I", "Mf8M", "4jBd", "anGR", "Pipt",
                     "QHon", "GNlc", "UeXM", "mVM5", "ABI8", "RhB3", "5h2s", "hOYo",
                     "gaId", "DX40", "THMu", "EwlP", "n9Mz", "oC1S", "BfMl", "uCZ1",
                     "G2bA", "MOH9", "zZ0O", "PKDO", "3nRU", "Z6ie", "4cso", "LnQO",
                     "MJTtT","td3rC","A5JNR","1yL5B","rQnJk","jNKYF","CD0XD","pFLSG",
                     "fxO1a","CAjBE","ORk4e","0LERI","R7d0x","Qqd7v","6Kih5","9tTCB",
                     "yCg9U","D2Tv7","XpNHn","6zeFQ","BT2cs","WGhKW","zTv6B","TTPFk",
                     "XjNVX","pg9yW","4pKiZ","mQUhL","xrXzR","kVRm5","NSyC4","olXm9",
                     "UWkYy","8Ys6r","yd4Fl","5L4mB","nP3nH","f0DFb","glnQa","DlXQa",
                     "cQdH6","eBmIN","fDj6F","ezLow","C15vu","I2Z2j","BQgzg","eVBid",
                     "hn5TO","WZyQN","xXgsE","sL6nK","8DKD8","jcrbp","AcRak","h8N5o",
                     "LViwC","ThEKf","O7fd5","oN0Id","OM1m0","4OLiR","VIa8N","bJZFG",
                     "9j3rL","SzW0N","7m7pY","mY9bg","k1p3e","3OFm1","r45se","VYwz3",
                     "pDjXt","ZcqcJ","npPHx","hA3bw","w7lSO","jEmZL","1x3AZ","FN47G",
                     "kThNf","aC4fq","rzDwi","CYRNG","gCeuG","wCVqO","d1R60","bEauW",
                     "KeUwW","lIKhO","RfPv3","dK5wE","1X7qu","tRwEn","1c03P","GwHCl",
                     "CsJaO","zl4j1","e0aEc","Uskgi","rgTGR","jyR4g","Tt6l4","lRoaw",
                     "94ult","qZwBX","eYW8S","Qf6UH","AbV56","N1hJq","JIaVe","8LHEx",
                     "DeNbS","30I0a","hm6qw","3jcaO","4WkuA","mQ219","Gb81C","yx4HM",
                     "Chlqfi9S1y", "BMwUgVFu2X", "ZmpEGOVrVe", "13ggJxrPkC", "fcJJpyMGjm", "9T00Dv4ZAb",
                     "p3YRcP7M2o", "sR0qNUXCHv", "gCxWZbJ6rb", "R4YtzRXXUl", "vwyYz5j6pY", "XPWUvLXhJ7",
                     "7PwfnVVb7U", "1f34Q6hOYz", "1EM2abZY61", "0a6Ivi4S0a", "Teq2LrQs2T", "dWXLCgWHc8",
                     "LawMv7ujn4", "N8VFgbZQx5", "tfvHHxoDgi", "ImwYgXA2tf", "KkIES9NqZO", "ajcz0qjjda",
                     "6Vz28vlGs9", "VMCc5W8cCt", "BiQB8BRJ98", "43CpOJSMpA", "jfBJdqwXcU", "ecHR9EO2ib",
                     "LH7CcXyCZ7", "JntqGSgSpa", "0MbTMpZPFW", "5FJSdiCXzR", "5gda2AhA2x", "lrDFc1lnXk",
                     "zrEwECHvjs", "B0JldDxFa1", "6DYal4QxKa", "Hsqx6kP2S4", "zZwnALSuFh", "Shh4ISZcKW",
                     "P9VDaNSk7Z", "mEI2PLSCO6", "WyTyrQORtu", "IvJyMMRgh3", "Q6pgJq8Nkv", "dhOgR3tDAD",
                     "Y9h6bVgbxO", "wA15tiOPTm", "8TaIKf1zCO", "z75dzabHBs", "AS6OPnwoJI", "2DSZka9Auj",
                     "QLzUjV2CWs", "KZSN2SVhia", "7ttYKWF2ue", "1Zxfu7B2ST", "RnkpmwjsCi", "YpcSIzaqx5",
                     "RDEwFD9gmX", "Nlx3V4Cjw4", "9ZdvITOj8M", "httUPWMNXO", "Ypv9PjxGwa", "LlwyNolNnH",
                     "6xpJOht47a", "tbmz4WIdcG", "OwzuVDlb7D", "PBQKJxo8DQ", "uVnMQn7hK6", "rlnZINuDUa",
                     "2feyyYukPa", "teOlpKuDBn", "LxBSWh0dL1", "Onyb7r4Jp0", "bZxXE6xOXg", "d9NSvNTunQ",
                     "ONerLBic32", "8mar4rKmFk", "5cCN9uwaCg", "ElVrYOHHMv", "YF6Og8DX40", "OgiCwpCQ5a",
                     "K6nSRZVxdR", "gqyXXXoVFW", "ulyRYizcBP", "khUx31K5UR", "qZFRzVthju", "pQBh0vnB20",
                     "dk8NIN7ajy", "XP7ed1OjZx", "IRYNwA5iFR", "hiSEBhTukC", "Ns4jJ3jzGo", "dYoCSxjIvM",
                     "HzGLbl5i1g", "baizENd4ko", "6rCqGBO8t1", "QWGfC8UaA7", "JFhRfxQe4K", "8R4W6IWANz",
                     "2TnWf1w7JH", "0z69e0wcoG", "8SN1mRHCY7", "oFGCYHHwGX", "G8xqnBgxjO", "6B3SAOayHt",
                     "XRW3ZSG1gw", "WcIjTxMxOM", "wNqCAIaTb2", "gO4em4HW8H", "TgGFSMEtbG", "WiwmbEw3QA",
                     "D2xshYUgpu", "xRUZCQVzBs", "nCnUmMgIjE", "p4Ewt1yCJr", "MeOjDcaMY5", "1XelMeXiiI"
                  };
   static const std::size_t rand_str_size = sizeof(rand_str) / sizeof(std::string);

   for (unsigned int i = 0; i < rand_str_size; ++i)
   {
      std::string s0 = rand_str[i];
      std::string s1 = rand_str[(i + 1) % rand_str_size];
      std::string s2 = rand_str[(i + 2) % rand_str_size];
      std::string s3 = rand_str[(i + 3) % rand_str_size];
      std::string s4 = rand_str[(i + 4) % rand_str_size];
      std::string s5 = rand_str[(i + 5) % rand_str_size];
      std::string s6 = rand_str[(i + 6) % rand_str_size];

      outliers.push_back(s0);
      outliers.push_back(s0 + s1);
      outliers.push_back(s0 + s2 + s4);
      outliers.push_back(s0 + s1 + s3);
      outliers.push_back(s0 + s1 + s2 + s3 + s4 + s5);
      outliers.push_back(s0 + s1 + s2 + s3 + s4 + s5 + s6);

      outliers.push_back(reverse(s0));
      outliers.push_back(reverse(s0 + s1));
      outliers.push_back(reverse(s0 + s2 + s4));
      outliers.push_back(reverse(s0 + s1 + s3));
      outliers.push_back(reverse(s0 + s1 + s2 + s3 + s4 + s5));
      outliers.push_back(reverse(s0 + s1 + s2 + s3 + s4 + s5 + s6));
   }

   std::sort(outliers.begin(),outliers.end());

   purify_outliers(word_list,outliers);

   std::cout << "Complete." << std::endl;
}

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load_word_list()

bool load_word_list	(	int	argc,
		char *	argv[],
		std::vector< std::string > &	word_list
	)

Definition at line 127 of file bloom_filter_example03.cpp.

References read_file().

Referenced by main().

{
   // Note: The word-lists can be obtained from:
   // https://github.com/ArashPartow/bloom
   static const std::string wl_list[] =
                     { "word-list.txt",
                       "word-list-large.txt",
                       "word-list-extra-large.txt",
                       "random-list.txt"
                     };

   std::size_t index = 0;

   if (2 == argc)
   {
      index = ::atoi(argv[1]);

      const std::size_t wl_list_size = sizeof(wl_list) / sizeof(std::string);

      if (index >= wl_list_size)
      {
         std::cout << "Invalid world list index: " << index << std::endl;
         return false;
      }
   }

   std::cout << "Loading list " << wl_list[index] << ".....";

   if (!read_file(wl_list[index],word_list))
   {
      return false;
   }

   if (word_list.empty())
   {
      std::cout << "No word list - Either none requested, or desired word list could not be loaded." << std::endl;
      return false;
   }
   else
      std::cout << " Complete." << std::endl;

   return true;
}

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main()

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 56 of file bloom_filter_example03.cpp.

References compressible_bloom_filter::compress(), bloom_parameters::compute_optimal_parameters(), bloom_filter::contains(), bloom_filter::contains_all(), bloom_filter::effective_fpp(), bloom_parameters::false_positive_probability, generate_outliers(), bloom_filter::insert(), load_word_list(), bloom_parameters::maximum_number_of_hashes, bloom_parameters::projected_element_count, bloom_parameters::random_seed, and compressible_bloom_filter::size().

{
   std::vector<std::string> word_list;
   std::deque<std::string> outliers;

   if (!load_word_list(argc,argv,word_list))
   {
      return 1;
   }

   generate_outliers(word_list,outliers);

   unsigned int random_seed = 0xA57EC3B2;

   const double desired_probability_of_false_positive = 1.0 / word_list.size();

   bloom_parameters parameters;
   parameters.projected_element_count    = word_list.size();
   parameters.false_positive_probability = desired_probability_of_false_positive;
   parameters.random_seed                = random_seed++;
   parameters.maximum_number_of_hashes   = 7;

   if (!parameters)
   {
      std::cout << "Error - Invalid set of bloom filter parameters!" << std::endl;
      return 1;
   }

   parameters.compute_optimal_parameters();

   compressible_bloom_filter filter(parameters);

   filter.insert(word_list.begin(),word_list.end());

   std::cout << "Filter Size\tEFPP    \tOFPP    \tDiff" << std::endl;

   while (filter.size() > 1)
   {
      std::vector<std::string>::iterator it = filter.contains_all(word_list.begin(),word_list.end());

      if (word_list.end() != it)
      {
         std::cout << "ERROR: key not found in bloom filter! =>" << (*it) << std::endl;
         return 1;
      }

      std::size_t total_false_positive = 0;

      for (std::deque<std::string>::iterator itr = outliers.begin(); itr != outliers.end(); ++itr)
      {
         if (filter.contains(*itr)) ++total_false_positive;
      }

      double pfp = total_false_positive / (1.0 * outliers.size());

      printf("%11llu\t%8.7f\t%8.7f\t%8.6f\n",
             static_cast<unsigned long long>(filter.size()),
             filter.effective_fpp(),
             pfp,
             100.0 * (pfp / filter.effective_fpp()));

      if (!filter.compress(5.0))
      {
         std::cout << "Filter cannot be compressed any further." << std::endl;
         break;
      }
   }

   return 0;
}

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purify_outliers()

void purify_outliers	(	const std::vector< std::string > &	word_list,
		std::deque< std::string > &	outliers
	)

Definition at line 304 of file bloom_filter_example03.cpp.

Referenced by generate_outliers().

{
   std::set<std::string> set1;
   std::set<std::string> set2;

   std::copy(word_list.begin(), word_list.end(), std::inserter(set1,set1.begin()));
   std::copy(outliers .begin(), outliers .end(), std::inserter(set2,set2.begin()));

   std::deque<std::string> intersect_list;

   std::set_intersection(set1.begin(),set1.end(),
                         set2.begin(),set2.end(),
                         std::back_inserter(intersect_list));

   std::sort(intersect_list.begin(),intersect_list.end());

   if (!intersect_list.empty())
   {
      std::deque<std::string> new_outliers;

      for (std::deque<std::string>::iterator it = outliers.begin(); it != outliers.end(); ++it)
      {
         if (!std::binary_search(intersect_list.begin(),intersect_list.end(),*it))
         {
            new_outliers.push_back(*it);
         }
      }

      outliers.swap(new_outliers);
   }
}

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read_file()

template<class T , class Allocator , template< class, class > class Container>

bool read_file	(	const std::string &	file_name,
		Container< T, Allocator > &	c
	)

Definition at line 174 of file bloom_filter_example03.cpp.

Referenced by load_word_list().

{
   std::ifstream stream(file_name.c_str());

   if (!stream)
   {
      std::cout << "Error: Failed to open file '" << file_name << "'" << std::endl;
      return false;
   }

   std::string buffer;

   while (std::getline(stream,buffer))
   {
      c.push_back(buffer);
   }

   return true;
}

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reverse()

std::string reverse

(

std::string

str

)

Definition at line 194 of file bloom_filter_example03.cpp.

Referenced by generate_outliers().

{
   // Not the most efficient way of doing this.
   std::reverse(str.begin(),str.end());
   return str;
}

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