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| #include <iostream>
#include <fstream>
#include <string>
using namespace std;
#define FILTER_SIZE 10
#define NUM_HASHES 7
#define WORD_BUF_SIZE 32
#define FILTER_SIZE_BYTES (1 << (FILTER_SIZE - 3))
#define FILTER_BITMASK ((1 << FILTER_SIZE) - 1)
/* function de hashage */
unsigned int RSHash (unsigned char const *, size_t);
unsigned int DJBHash (unsigned char const *, size_t);
unsigned int FNVHash (unsigned char const *, size_t);
unsigned int JSHash (unsigned char const *, size_t);
unsigned int PJWHash (unsigned char const *, size_t);
unsigned int SDBMHash(unsigned char const *, size_t);
unsigned int DEKHash (unsigned char const *, size_t);
/* fonction de help */
void Verifir_Sys(unsigned char[], char const *file, char const *file1);
void insert_word(unsigned char[], string word);
int in_dict(unsigned const char[], string word);
void get_hashes(unsigned int[], string const & word);
int main(int argc, char *argv[])
{
unsigned char filter[FILTER_SIZE_BYTES];
if(argc < 3){
cout<<"le nombre de parametre a fournir au fonction est insuffisant"<<endl;
}
else
Verifir_Sys(filter,argv[1],argv[2]);
return 1;
}
void Verifir_Sys(unsigned char filter[], char const *filename, char const *filename1)
{
string AdrePortSour;
string AdrePortDest;
int test;
fstream fichier(filename);
fstream fichiersysAck(filename1);
if ( !fichier ) { // si le fichier n'est pas trouvé
cout << "fichier inexistant";
} else { // sinon
bool continuer = true; // indicateur de fin de fichier
while( continuer ) {
string ch; // chaine contenant une ligne du fichier
fichier >> ch; // ranger une ligne dans ch
if ( ch != "" ){
if(ch=="S"){ //si la ligne n'est pas vide faire
fichier >> ch;
AdrePortSour=AdrePortSour+ch;
fichier >> ch;
AdrePortSour=AdrePortSour+" "+ch;
cout<<AdrePortSour<<endl;
AdrePortSour="";
insert_word(filter,AdrePortSour);
}
if(ch=="SA"){ //si la ligne n'est pas vide faire
fichier >> ch;
fichier >> ch;
fichier >> ch;
fichier >> ch;
AdrePortDest=AdrePortDest+ch;
fichier >> ch;
AdrePortDest=AdrePortDest+" "+ch;
cout<<AdrePortDest<<endl;
AdrePortDest="";
test=in_dict(filter,AdrePortDest);
if(test==0)
fichiersysAck <<AdrePortDest;
}
}
else // sinon
continuer = false; // sortir de la boucle de lecture
}//while
}
}
void insert_word(unsigned char filter[], string str)
{
unsigned int hash[NUM_HASHES];
int i;
get_hashes(hash, str);
for (i = 0; i < NUM_HASHES; i++) {
hash[i] = (hash[i] >> FILTER_SIZE) ^ (hash[i] & FILTER_BITMASK);
filter[hash[i] >> 3] |= 1 << (hash[i] & 7);
}
}
int in_dict(unsigned char const filter[], string str)
{
unsigned int hash[NUM_HASHES];
int i;
get_hashes(hash, str);
for (i = 0; i < NUM_HASHES; i++) {
hash[i] = (hash[i] >> FILTER_SIZE) ^ (hash[i] & FILTER_BITMASK);
if (!(filter[hash[i] >> 3] & (1 << (hash[i] & 7))))
return 0;
}
return 1;
}
void get_hashes(unsigned int hash[], std::string const &in)
{
unsigned char const *str = reinterpret_cast<unsigned char const*>(in.c_str());
size_t pos = in.length();
hash[0] = RSHash (str, pos);
hash[1] = DJBHash (str, pos);
hash[2] = FNVHash (str, pos);
hash[3] = JSHash (str, pos);
hash[4] = PJWHash (str, pos);
hash[5] = SDBMHash(str, pos);
hash[6] = DEKHash (str, pos);
}
/****************\
| Hash Functions |
\****************/
unsigned int RSHash(unsigned char const *str, size_t len)
{
unsigned int b = 378551;
unsigned int a = 63689;
unsigned int hash = 0;
size_t i = 0;
for(i = 0; i < len; str++, i++)
{
hash = hash * a + (*str);
a = a * b;
}
return hash;
}
unsigned int JSHash(unsigned char const *str, size_t len)
{
unsigned int hash = 1315423911;
size_t i = 0;
for(i = 0; i < len; str++, i++)
{
hash ^= ((hash << 5) + (*str) + (hash >> 2));
}
return hash;
}
unsigned int PJWHash(unsigned char const *str, size_t len)
{
const unsigned int BitsInUnsignedInt = static_cast<unsigned int>(sizeof(unsigned int)) * 8;
const unsigned int ThreeQuarters = ((BitsInUnsignedInt * 3) / 4);
const unsigned int OneEighth = (BitsInUnsignedInt / 8);
const unsigned int HighBits = static_cast<unsigned int>(0xFFFFFFFFu) << (BitsInUnsignedInt - OneEighth);
unsigned int hash = 0;
unsigned int test = 0;
size_t i = 0;
for(i = 0; i < len; str++, i++)
{
hash = (hash << OneEighth) + (*str);
if((test = hash & HighBits) != 0)
{
hash = (( hash ^ (test >> ThreeQuarters)) & (~HighBits));
}
}
return hash;
}
unsigned int SDBMHash(unsigned char const *str, size_t len)
{
unsigned int hash = 0;
size_t i = 0;
for(i = 0; i < len; str++, i++)
{
hash = (*str) + (hash << 6) + (hash << 16) - hash;
}
return hash;
}
unsigned int DJBHash(unsigned char const *str, size_t len)
{
unsigned int hash = 5381;
size_t i = 0;
for(i = 0; i < len; str++, i++)
{
hash = ((hash << 5) + hash) + (*str);
}
return hash;
}
unsigned int DEKHash(unsigned char const *str, size_t len)
{
unsigned int hash = static_cast<unsigned int>(len);
size_t i = 0;
for(i = 0; i < len; str++, i++)
{
hash = ((hash << 5) ^ (hash >> 27)) ^ (*str);
}
return hash;
}
unsigned int FNVHash(unsigned char const *str, size_t len)
{
const unsigned int fnv_prime = 0x811C9DC5u;
unsigned int hash = 0;
size_t i = 0;
for(i = 0; i < len; str++, i++)
{
hash *= fnv_prime;
hash ^= (*str);
}
return hash;
} |
