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-rw-r--r--src/lib/CMakeLists.txt1
-rw-r--r--src/lib/hashtable.c188
-rw-r--r--src/lib/tests/CMakeLists.txt1
-rw-r--r--src/lib/tests/hashtable_test.c133
4 files changed, 323 insertions, 0 deletions
diff --git a/src/lib/CMakeLists.txt b/src/lib/CMakeLists.txt
index 20ea473d..9eaca9fd 100644
--- a/src/lib/CMakeLists.txt
+++ b/src/lib/CMakeLists.txt
@@ -30,6 +30,7 @@ set(SOURCE_FILES
bitmap.c
cdap.c
dev.c
+ hashtable.c
irm.c
list.c
lockfile.c
diff --git a/src/lib/hashtable.c b/src/lib/hashtable.c
new file mode 100644
index 00000000..cc73d6a0
--- /dev/null
+++ b/src/lib/hashtable.c
@@ -0,0 +1,188 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Hash table with separate chaining on collisions
+ *
+ * Sander Vrijders <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ouroboros/config.h>
+#include <ouroboros/hashtable.h>
+#include <ouroboros/list.h>
+#include <ouroboros/errno.h>
+
+#include <assert.h>
+
+struct htable_entry {
+ struct list_head next;
+ uint64_t key;
+ void * val;
+};
+
+struct htable {
+ struct list_head * buckets;
+ bool hash_key;
+ uint64_t buckets_size;
+};
+
+struct htable * htable_create(uint64_t buckets, bool hash_key)
+{
+ struct htable * tmp;
+ unsigned int i;
+
+ if (buckets == 0)
+ return NULL;
+
+ buckets--;
+ buckets |= buckets >> 1;
+ buckets |= buckets >> 2;
+ buckets |= buckets >> 4;
+ buckets |= buckets >> 8;
+ buckets |= buckets >> 16;
+ buckets |= buckets >> 32;
+ buckets++;
+
+ tmp = malloc(sizeof(*tmp));
+ if (tmp == NULL)
+ return NULL;
+
+ tmp->hash_key = hash_key;
+ tmp->buckets_size = buckets;
+
+ tmp->buckets = malloc(buckets * sizeof(*tmp->buckets));
+ if (tmp->buckets == NULL) {
+ free(tmp);
+ return NULL;
+ }
+
+ for (i = 0; i < buckets; i++)
+ INIT_LIST_HEAD(&(tmp->buckets[i]));
+
+ return tmp;
+}
+
+int htable_destroy(struct htable * table)
+{
+ unsigned int i;
+ struct list_head * pos = NULL;
+ struct list_head * n = NULL;
+ struct htable_entry * entry;
+
+ assert(table);
+
+ for (i = 0; i < table->buckets_size; i++) {
+ list_for_each_safe(pos, n, &(table->buckets[i])) {
+ entry = list_entry(pos, struct htable_entry, next);
+ free(entry->val);
+ free(entry);
+ }
+ }
+
+ free(table->buckets);
+ free(table);
+
+ return 0;
+}
+
+static uint64_t hash(uint64_t x)
+{
+ x = (x ^ (x >> 30)) * UINT64_C(0xbf58476d1ce4e5b9);
+ x = (x ^ (x >> 27)) * UINT64_C(0x94d049bb133111eb);
+ x = x ^ (x >> 31);
+
+ return x;
+}
+
+static uint64_t calc_key(struct htable * table, uint64_t key)
+{
+ if (table->hash_key == true)
+ key = hash(key);
+
+ return (key & (table->buckets_size - 1));
+}
+
+int htable_insert(struct htable * table, uint64_t key, void * val)
+{
+ struct htable_entry * entry;
+ uint64_t lookup_key;
+ struct list_head * pos = NULL;
+
+ assert(table);
+
+ lookup_key = calc_key(table, key);
+
+ list_for_each(pos, &(table->buckets[lookup_key])) {
+ entry = list_entry(pos, struct htable_entry, next);
+ if (entry->key == key)
+ return -1;
+ }
+
+ entry = malloc(sizeof(*entry));
+ if (entry == NULL)
+ return -ENOMEM;
+
+ entry->key = key;
+ entry->val = val;
+ INIT_LIST_HEAD(&entry->next);
+
+ list_add(&entry->next, &(table->buckets[lookup_key]));
+
+ return 0;
+}
+
+void * htable_lookup(struct htable * table, uint64_t key)
+{
+ struct htable_entry * entry;
+ struct list_head * pos = NULL;
+ uint64_t lookup_key;
+
+ assert(table);
+
+ lookup_key = calc_key(table, key);
+
+ list_for_each(pos, &(table->buckets[lookup_key])) {
+ entry = list_entry(pos, struct htable_entry, next);
+ if (entry->key == key)
+ return entry->val;
+ }
+
+ return NULL;
+}
+
+int htable_delete(struct htable * table, uint64_t key)
+{
+ struct htable_entry * entry;
+ uint64_t lookup_key;
+ struct list_head * pos = NULL;
+ struct list_head * n = NULL;
+
+ assert(table);
+
+ lookup_key = calc_key(table, key);
+
+ list_for_each_safe(pos, n, &(table->buckets[lookup_key])) {
+ entry = list_entry(pos, struct htable_entry, next);
+ if (entry->key == key) {
+ list_del(&entry->next);
+ free(entry->val);
+ free(entry);
+ return 0;
+ }
+ }
+
+ return -1;
+}
diff --git a/src/lib/tests/CMakeLists.txt b/src/lib/tests/CMakeLists.txt
index 2135cb95..64671934 100644
--- a/src/lib/tests/CMakeLists.txt
+++ b/src/lib/tests/CMakeLists.txt
@@ -4,6 +4,7 @@ get_filename_component(PARENT_DIR ${PARENT_PATH} NAME)
create_test_sourcelist(${PARENT_DIR}_tests test_suite.c
# Add new tests here
bitmap_test.c
+ hashtable_test.c
)
add_executable(${PARENT_DIR}_test EXCLUDE_FROM_ALL ${${PARENT_DIR}_tests})
diff --git a/src/lib/tests/hashtable_test.c b/src/lib/tests/hashtable_test.c
new file mode 100644
index 00000000..07070472
--- /dev/null
+++ b/src/lib/tests/hashtable_test.c
@@ -0,0 +1,133 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Test of the hash table
+ *
+ * Sander Vrijders <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "hashtable.c"
+
+#include <stdio.h>
+
+#define HASHTABLE_SIZE 256
+#define INT_TEST 4
+
+int hashtable_test(int argc, char ** argv)
+{
+ struct htable * table;
+ int i;
+ int * j;
+
+ (void) argc;
+ (void) argv;
+
+ table = htable_create(HASHTABLE_SIZE, true);
+ if (table == NULL) {
+ printf("Failed to create.\n");
+ return -1;
+ }
+
+ if (htable_destroy(table)) {
+ printf("Failed to destroy.\n");
+ return -1;
+ }
+
+ table = htable_create(HASHTABLE_SIZE, false);
+ if (table == NULL) {
+ printf("Failed to create.\n");
+ return -1;
+ }
+
+ for (i = 0; i < HASHTABLE_SIZE + INT_TEST + 2; i++) {
+ j = malloc(sizeof(*j));
+ if (j == NULL) {
+ printf("Failed to malloc.\n");
+ htable_destroy(table);
+ return -1;
+ }
+ *j = i;
+
+ if (htable_insert(table, i, (void *) j)) {
+ printf("Failed to insert.\n");
+ htable_destroy(table);
+ return -1;
+ }
+ }
+
+ j = (int *) htable_lookup(table, INT_TEST);
+ if (j == NULL) {
+ printf("Failed to lookup.\n");
+ htable_destroy(table);
+ return -1;
+ }
+
+ if (*j != INT_TEST) {
+ printf("Lookup returned wrong value (%d != %d).\n",
+ INT_TEST, *j);
+ htable_destroy(table);
+ return -1;
+ }
+
+ j = (int *) htable_lookup(table, HASHTABLE_SIZE + INT_TEST);
+ if (j == NULL) {
+ printf("Failed to lookup.\n");
+ htable_destroy(table);
+ return -1;
+ }
+
+ if (*j != HASHTABLE_SIZE + INT_TEST) {
+ printf("Lookup returned wrong value (%d != %d).\n",
+ INT_TEST, *j);
+ htable_destroy(table);
+ return -1;
+ }
+
+ if (htable_delete(table, INT_TEST)) {
+ printf("Failed to delete.\n");
+ htable_destroy(table);
+ return -1;
+ }
+
+ j = (int *) htable_lookup(table, INT_TEST);
+ if (j != NULL) {
+ printf("Failed to delete properly.\n");
+ htable_destroy(table);
+ return -1;
+ }
+
+ j = (int *) htable_lookup(table, HASHTABLE_SIZE + INT_TEST);
+ if (j == NULL) {
+ printf("Failed to lookup after deletion.\n");
+ htable_destroy(table);
+ return -1;
+ }
+
+ if (*j != HASHTABLE_SIZE + INT_TEST) {
+ printf("Lookup returned wrong value (%d != %d).\n",
+ INT_TEST, *j);
+ htable_destroy(table);
+ return -1;
+ }
+
+ if (htable_destroy(table)) {
+ printf("Failed to destroy.\n");
+ return -1;
+ }
+
+ return 0;
+}
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