From d6c74352427367a334d37469962bbcf1b9ae364c Mon Sep 17 00:00:00 2001
From: Timo Teras <timo.teras@iki.fi>
Date: Thu, 17 Apr 2008 14:09:13 +0000
Subject: Initial commit of some stuff written so far. Still in state of flux.
 Expect breakage and major changes.

---
 src/hash.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/hash.c

(limited to 'src/hash.c')

diff --git a/src/hash.c b/src/hash.c
new file mode 100644
index 0000000..447601e
--- /dev/null
+++ b/src/hash.c
@@ -0,0 +1,97 @@
+/* hash.c - Alpine Package Keeper (APK)
+ *
+ * Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
+ * Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
+ * All rights reserved.
+ *
+ * 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. See http://www.gnu.org/ for details.
+ */
+
+#include "apk_defines.h"
+#include "apk_hash.h"
+
+unsigned long apk_hash_string(const char *str)
+{
+	unsigned long hash = 5381;
+	int c;
+
+	while ((c = *str++) != 0)
+		hash = hash * 33 + c;
+
+	return hash;
+}
+
+unsigned long apk_hash_csum(const void *ptr)
+{
+	return *(const unsigned long *) ptr;
+}
+
+void apk_hash_init(struct apk_hash *h, const struct apk_hash_ops *ops,
+		   int num_buckets)
+{
+	h->ops = ops;
+	h->buckets = apk_hash_array_resize(NULL, num_buckets);
+	h->num_items = 0;
+}
+
+void apk_hash_free(struct apk_hash *h)
+{
+	apk_hash_foreach(h, (apk_hash_enumerator_f) h->ops->delete_item, NULL);
+	free(h->buckets);
+}
+
+int apk_hash_foreach(struct apk_hash *h, apk_hash_enumerator_f e, void *ctx)
+{
+	apk_hash_node *pos, *n;
+	ptrdiff_t offset = h->ops->node_offset;
+	int i, r;
+
+	for (i = 0; i < h->buckets->num; i++) {
+		hlist_for_each_safe(pos, n, &h->buckets->item[i]) {
+			r = e(((void *) pos) - offset, ctx);
+			if (r != 0)
+				return r;
+		}
+	}
+
+	return 0;
+}
+
+apk_hash_item apk_hash_get(struct apk_hash *h, apk_hash_key key)
+{
+	ptrdiff_t offset = h->ops->node_offset;
+	unsigned long hash;
+	apk_hash_node *pos;
+	apk_hash_item item;
+	apk_hash_key itemkey;
+
+	hash = h->ops->hash_key(key) % h->buckets->num;
+	hlist_for_each(pos, &h->buckets->item[hash]) {
+		item = ((void *) pos) - offset;
+		itemkey = h->ops->get_key(item);
+		if (h->ops->compare(key, itemkey) == 0)
+			return item;
+	}
+
+	return NULL;
+}
+
+void apk_hash_insert(struct apk_hash *h, apk_hash_item item)
+{
+	apk_hash_key key;
+	unsigned long hash;
+	apk_hash_node *node;
+
+	key = h->ops->get_key(item);
+	hash = h->ops->hash_key(key) % h->buckets->num;
+	node = (apk_hash_node *) (item + h->ops->node_offset);
+	hlist_add_head(node, &h->buckets->item[hash]);
+	h->num_items++;
+}
+
+void apk_hash_delete(struct apk_hash *h, apk_hash_key key)
+{
+}
+
-- 
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