patchdiff2/hash.cpp at master · flattoride/patchdiff2 · GitHub

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Patchdiff2

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License version 2 as

published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program. If not, see <http://www.gnu.org/licenses/>.

#include "precomp.hpp"

#include "hash.hpp"

#include "sig.hpp"

/*------------------------------------------------*/

/* function : hash_init */

/* description: Initializes hash table to NULL */

/*------------------------------------------------*/

hpsig_t * hash_init(size_t num)

{

unsigned int i;

hpsig_t * hsig;

static unsigned int primes[] = { 67, 251, 509, 1021, 2039, 4093, 8191, 16381, 32749, 65521, 131071, 262139, 524287, 1048573, 2097143 };

for (i=0; i < ((sizeof(primes) / sizeof(unsigned int)) - 1); i++)

if (primes[i] > (num/3)) break;

hsig = (hpsig_t *)qalloc(sizeof(*hsig));

if (!hsig) return NULL;

hsig->max_hash = primes[i];

hsig->table = (hsignature_t **) qalloc(hsig->max_hash * sizeof(*hsig->table));

if (!hsig->table)

{

qfree(hsig);

return NULL;

}

for (i = 0; i < hsig->max_hash; i++)

hsig->table[i] = NULL;

return hsig;

}

/*------------------------------------------------*/

/* function : hash_mk_ea */

/* description: Creates hash value */

/*------------------------------------------------*/

unsigned int hash_mk_ea(hpsig_t * htable, ea_t val)

{

char * ptr;

unsigned int h = 0;

int i;

ptr = (char *) &val;

for (i=0; i<sizeof(val); i++)

{

h += ptr[i];

h += ( h << 10 );

h ^= ( h >> 6 );

}

h += ( h << 3);

h ^= ( h >> 11 );

h += ( h >> 15 );

return h % htable->max_hash;

}

/*------------------------------------------------*/

/* function : hash_add_ea */

/* description: Adds element to the hash table */

/*------------------------------------------------*/

int hash_add_ea (hpsig_t * htable, psig_t * sig)

{

int id = hash_mk_ea(htable, sig->startEA);

hsignature_t * hsig = NULL;

hsig = (hsignature_t *)qalloc(sizeof(*hsig));

if (!hsig) return -1;

hsig->sig = sig;

hsig->next = htable->table[id];

htable->table[id] = hsig;

return 0;

}

/*------------------------------------------------*/

/* function : hash_find_ea */

/* description: Finds element in the hash table */

/*------------------------------------------------*/

psig_t * hash_find_ea (hpsig_t * htable, ea_t ea)

{

if (ea == BADADDR)

return NULL;

int id = hash_mk_ea(htable, ea);

hsignature_t * hsig;

hsig = htable->table[id];

while (hsig != NULL)

{

if (hsig->sig->startEA == ea)

return hsig->sig;

hsig = hsig->next;

}

return NULL;

}

/*------------------------------------------------*/

/* function : hash_free */

/* description: Frees hash table */

/*------------------------------------------------*/

void hash_free (hpsig_t * htable)

{

unsigned int i;

hsignature_t * hsig, * tmp;

for (i = 0; i < htable->max_hash; i++)

{

hsig = htable->table[i];

while (hsig != NULL)

{

tmp = hsig->next;

qfree (hsig);

hsig = tmp;

}

qfree(htable);

}

patchdiff2/hash.cpp at master · flattoride/patchdiff2 · GitHub

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