t07-hashtable.c 4.86 KB
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/*
 * This file 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.
 *
 * In addition to the permissions in the GNU General Public License,
 * the authors give you unlimited permission to link the compiled
 * version of this file into combinations with other programs,
 * and to distribute those combinations without any restriction
 * coming from the use of this file.  (The General Public License
 * restrictions do apply in other respects; for example, they cover
 * modification of the file, and distribution when not linked into
 * a combined executable.)
 *
 * This file 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */
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#include "test_lib.h"
#include "test_helpers.h"
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#include "hashtable.h"
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#include "hash.h"
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typedef struct _aux_object {
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	int __bulk;
	git_oid id;
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	int visited;
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} table_item;

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static uint32_t hash_func(const void *key, int hash_id)
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{
	uint32_t r;
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	const git_oid *id = key;
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	memcpy(&r, id->id + (hash_id * sizeof(uint32_t)), sizeof(r));
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	return r;
}

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static int hash_cmpkey(const void *a, const void *b)
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{
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	return git_oid_cmp(a, b);
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}
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BEGIN_TEST(table0, "create a new hashtable")
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	git_hashtable *table = NULL;
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	table = git_hashtable_alloc(55, hash_func, hash_cmpkey);
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	must_be_true(table != NULL);
	must_be_true(table->size_mask + 1 == 64);

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	git_hashtable_free(table);
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END_TEST

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BEGIN_TEST(table1, "fill the hashtable with random entries")
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	const int objects_n = 32;
	int i;

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	table_item *objects;
	git_hashtable *table = NULL;

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	table = git_hashtable_alloc(objects_n * 2, hash_func, hash_cmpkey);
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	must_be_true(table != NULL);

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	objects = git__malloc(objects_n * sizeof(table_item));
	memset(objects, 0x0, objects_n * sizeof(table_item));
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	/* populate the hash table */
	for (i = 0; i < objects_n; ++i) {
		git_hash_buf(&(objects[i].id), &i, sizeof(int));
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		must_pass(git_hashtable_insert(table, &(objects[i].id), &(objects[i])));
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	}

	/* make sure all the inserted objects can be found */
	for (i = 0; i < objects_n; ++i) {
		git_oid id;
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		table_item *ob;
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		git_hash_buf(&id, &i, sizeof(int));
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		ob = (table_item *)git_hashtable_lookup(table, &id);
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		must_be_true(ob != NULL);
		must_be_true(ob == &(objects[i]));
	}

	/* make sure we cannot find inexisting objects */
	for (i = 0; i < 50; ++i) {
		int hash_id;
		git_oid id;

		hash_id = (rand() % 50000) + objects_n;
		git_hash_buf(&id, &hash_id, sizeof(int));
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		must_be_true(git_hashtable_lookup(table, &id) == NULL);
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	}

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	git_hashtable_free(table);
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	git__free(objects);
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END_TEST


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BEGIN_TEST(table2, "make sure the table resizes automatically")
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	const int objects_n = 64;
	int i;
	unsigned int old_size;
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	table_item *objects;
	git_hashtable *table = NULL;
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	table = git_hashtable_alloc(objects_n, hash_func, hash_cmpkey);
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	must_be_true(table != NULL);

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	objects = git__malloc(objects_n * sizeof(table_item));
	memset(objects, 0x0, objects_n * sizeof(table_item));
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	old_size = table->size_mask + 1;

	/* populate the hash table -- should be automatically resized */
	for (i = 0; i < objects_n; ++i) {
		git_hash_buf(&(objects[i].id), &i, sizeof(int));
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		must_pass(git_hashtable_insert(table, &(objects[i].id), &(objects[i])));
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	}

	must_be_true(table->size_mask > old_size);

	/* make sure all the inserted objects can be found */
	for (i = 0; i < objects_n; ++i) {
		git_oid id;
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		table_item *ob;
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		git_hash_buf(&id, &i, sizeof(int));
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		ob = (table_item *)git_hashtable_lookup(table, &id);
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		must_be_true(ob != NULL);
		must_be_true(ob == &(objects[i]));
	}

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	git_hashtable_free(table);
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	git__free(objects);
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END_TEST
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BEGIN_TEST(tableit0, "iterate through all the contents of the table")
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	const int objects_n = 32;
	int i;
	table_item *objects, *ob;

	git_hashtable *table = NULL;

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	table = git_hashtable_alloc(objects_n * 2, hash_func, hash_cmpkey);
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	must_be_true(table != NULL);

	objects = git__malloc(objects_n * sizeof(table_item));
	memset(objects, 0x0, objects_n * sizeof(table_item));

	/* populate the hash table */
	for (i = 0; i < objects_n; ++i) {
		git_hash_buf(&(objects[i].id), &i, sizeof(int));
		must_pass(git_hashtable_insert(table, &(objects[i].id), &(objects[i])));
	}

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	GIT_HASHTABLE_FOREACH_VALUE(table, ob, ob->visited = 1);
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	/* make sure all nodes have been visited */
	for (i = 0; i < objects_n; ++i)
		must_be_true(objects[i].visited);

	git_hashtable_free(table);
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	git__free(objects);
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END_TEST


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BEGIN_SUITE(hashtable)
	ADD_TEST(table0);
	ADD_TEST(table1);
	ADD_TEST(table2);
	ADD_TEST(tableit0);
END_SUITE
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