Add hashtable code from openzap/freetdm to FS core

2026-07-24 05:02:10 +00:00 · 2014-03-09 00:36:17 +05:00
parent 42b74ba62e
commit 32cce8027e
4 changed files with 750 additions and 1 deletions
@@ -0,0 +1,130 @@
+/* 
+ * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ *
+ * switch_hashtable_private.h -- Hashtable
+ *
+ */
+
+/* hashtable_private.h -- Copyright (C) 2002, 2004 Christopher Clark <firstname.lastname@cl.cam.ac.uk> */
+
+#ifndef __HASHTABLE_PRIVATE_CWC22_H__
+#define __HASHTABLE_PRIVATE_CWC22_H__
+
+#include "switch_hashtable.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*****************************************************************************/
+
+struct entry
+{
+    void *k, *v;
+    unsigned int h;
+	hashtable_flag_t flags;
+    struct entry *next;
+};
+
+struct switch_hashtable_iterator {
+	unsigned int pos;
+	struct entry *e;
+	struct switch_hashtable *h;
+};
+
+struct switch_hashtable {
+    unsigned int tablelength;
+    struct entry **table;
+    unsigned int entrycount;
+    unsigned int loadlimit;
+    unsigned int primeindex;
+    unsigned int (*hashfn) (void *k);
+    int (*eqfn) (void *k1, void *k2);
+	struct switch_hashtable_iterator iterator;
+};
+
+/*****************************************************************************/
+
+/*****************************************************************************/
+static inline unsigned int
+hash(switch_hashtable_t *h, void *k)
+{
+    /* Aim to protect against poor hash functions by adding logic here
+     * - logic taken from java 1.4 hashtable source */
+    unsigned int i = h->hashfn(k);
+    i += ~(i << 9);
+    i ^=  ((i >> 14) | (i << 18)); /* >>> */
+    i +=  (i << 4);
+    i ^=  ((i >> 10) | (i << 22)); /* >>> */
+    return i;
+}
+
+
+/*****************************************************************************/
+/* indexFor */
+static __inline__ unsigned int
+indexFor(unsigned int tablelength, unsigned int hashvalue) {
+    return (hashvalue % tablelength);
+}
+
+/* Only works if tablelength == 2^N */
+/*static inline unsigned int
+  indexFor(unsigned int tablelength, unsigned int hashvalue)
+  {
+  return (hashvalue & (tablelength - 1u));
+  }
+*/
+
+/*****************************************************************************/
+#define freekey(X) free(X)
+/*define freekey(X) ; */
+
+#ifdef __cplusplus
+}
+#endif
+
+/*****************************************************************************/
+
+#endif /* __HASHTABLE_PRIVATE_CWC22_H__*/
+
+/*
+ * Copyright (c) 2002, Christopher Clark
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 
+ * * Neither the name of the original author; nor the names of any contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ * 
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+/* For Emacs:
+ * Local Variables:
+ * mode:c
+ * indent-tabs-mode:t
+ * tab-width:4
+ * c-basic-offset:4
+ * End:
+ * For VIM:
+ * vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
+ */