1 files changed, 159 insertions, 0 deletions
diff --git a/src/glsl/hash_table.c b/src/glsl/hash_table.c
new file mode 100644
index 00000000000..e89a2564d76
--- /dev/null
+++ b/src/glsl/hash_table.c
@@ -0,0 +1,159 @@
+/*
+ * Copyright © 2008 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file hash_table.c
+ * \brief Implementation of a generic, opaque hash table data type.
+ *
+ * \author Ian Romanick <[email protected]>
+ */
+
+#include "main/imports.h"
+#include "main/simple_list.h"
+#include "hash_table.h"
+
+struct node {
+   struct node *next;
+   struct node *prev;
+};
+
+struct hash_table {
+    hash_func_t    hash;
+    hash_compare_func_t  compare;
+
+    unsigned num_buckets;
+    struct node buckets[1];
+};
+
+
+struct hash_node {
+    struct node link;
+    const void *key;
+    void *data;
+};
+
+
+struct hash_table *
+hash_table_ctor(unsigned num_buckets, hash_func_t hash,
+                hash_compare_func_t compare)
+{
+    struct hash_table *ht;
+    unsigned i;
+
+
+    if (num_buckets < 16) {
+        num_buckets = 16;
+    }
+
+    ht = _mesa_malloc(sizeof(*ht) + ((num_buckets - 1) 
+				     * sizeof(ht->buckets[0])));
+    if (ht != NULL) {
+        ht->hash = hash;
+        ht->compare = compare;
+        ht->num_buckets = num_buckets;
+
+        for (i = 0; i < num_buckets; i++) {
+            make_empty_list(& ht->buckets[i]);
+        }
+    }
+
+    return ht;
+}
+
+
+void
+hash_table_dtor(struct hash_table *ht)
+{
+   hash_table_clear(ht);
+   _mesa_free(ht);
+}
+
+
+void
+hash_table_clear(struct hash_table *ht)
+{
+   struct node *node;
+   struct node *temp;
+   unsigned i;
+
+
+   for (i = 0; i < ht->num_buckets; i++) {
+      foreach_s(node, temp, & ht->buckets[i]) {
+	 remove_from_list(node);
+	 _mesa_free(node);
+      }
+
+      assert(is_empty_list(& ht->buckets[i]));
+   }
+}
+
+
+void *
+hash_table_find(struct hash_table *ht, const void *key)
+{
+    const unsigned hash_value = (*ht->hash)(key);
+    const unsigned bucket = hash_value % ht->num_buckets;
+    struct node *node;
+
+    foreach(node, & ht->buckets[bucket]) {
+       struct hash_node *hn = (struct hash_node *) node;
+
+       if ((*ht->compare)(hn->key, key) == 0) {
+	  return hn->data;
+       }
+    }
+
+    return NULL;
+}
+
+
+void
+hash_table_insert(struct hash_table *ht, void *data, const void *key)
+{
+    const unsigned hash_value = (*ht->hash)(key);
+    const unsigned bucket = hash_value % ht->num_buckets;
+    struct hash_node *node;
+
+    node = _mesa_calloc(sizeof(*node));
+
+    node->data = data;
+    node->key = key;
+
+    insert_at_head(& ht->buckets[bucket], & node->link);
+}
+
+
+unsigned
+hash_table_string_hash(const void *key)
+{
+    const char *str = (const char *) key;
+    unsigned hash = 5381;
+
+
+    while (*str != '\0') {
+        hash = (hash * 33) + *str;
+        str++;
+    }
+
+    return hash;
+}