From: Alexander Barton <alex@barton.de>
Date: Thu, 14 Mar 2002 15:49:36 +0000 (+0000)
Subject: - API fuer Hash() definiert.
X-Git-Tag: rel-0-4-1~67
X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=ngircd-alex.git;a=commitdiff_plain;h=b422b11865a6243c070983e3a80ea226904f0edc;hp=8a45b177ce478d466d42d59767c4e73405b616b0;ds=inline

- API fuer Hash() definiert.
---

diff --git a/src/ngircd/hash.c b/src/ngircd/hash.c
index 511dba15..d6cb516a 100644
--- a/src/ngircd/hash.c
+++ b/src/ngircd/hash.c
@@ -9,7 +9,7 @@
  * Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
  * der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
  *
- * $Id: hash.c,v 1.1 2002/03/14 15:31:22 alex Exp $
+ * $Id: hash.c,v 1.2 2002/03/14 15:49:36 alex Exp $
  *
  * hash.c: Hash-Werte berechnen
  */
@@ -24,6 +24,16 @@
 #include "hash.h"
 
 
+LOCAL UINT32 jenkins_hash( register UINT8 *k, register UINT32 length, register UINT32 initval);
+
+
+GLOBAL UINT32 Hash( CHAR *String )
+{
+	/* Hash-Wert ueber String berechnen */
+	return jenkins_hash( String, strlen( String ), 42 );
+} /* Hash */
+
+
 /*
  * Die hier verwendete Hash-Funktion stammt aus lookup2.c von Bob Jenkins
  * (URL: <http://burtleburtle.net/bob/c/lookup2.c>). Aus dem Header:
@@ -37,11 +47,7 @@
  */
 
 
-typedef unsigned long int ub4;
-typedef unsigned char ub1;
-
-
-#define hashsize(n) ((ub4)1<<(n))
+#define hashsize(n) ((UINT32)1<<(n))
 #define hashmask(n) (hashsize(n)-1)
 
 #define mix(a,b,c) \
@@ -55,17 +61,17 @@ typedef unsigned char ub1;
 	a -= b; a -= c; a ^= (c>>3);  \
 	b -= c; b -= a; b ^= (a<<10); \
 	c -= a; c -= b; c ^= (b>>15); \
-}
+} /* mix */
 
 
-ub4 hash( register ub1 *k, register ub4 length, register ub4 initval)
+LOCAL UINT32 jenkins_hash( register UINT8 *k, register UINT32 length, register UINT32 initval)
 {
 	/* k: the key
 	 * length: length of the key
 	 * initval: the previous hash, or an arbitrary value
 	 */
 
-	register ub4 a,b,c,len;
+	register UINT32 a,b,c,len;
 
 	/* Set up the internal state */
 	len = length;
@@ -75,9 +81,9 @@ ub4 hash( register ub1 *k, register ub4 length, register ub4 initval)
 	/* handle most of the key */
 	while (len >= 12)
 	{
-		a += (k[0] +((ub4)k[1]<<8) +((ub4)k[2]<<16) +((ub4)k[3]<<24));
-		b += (k[4] +((ub4)k[5]<<8) +((ub4)k[6]<<16) +((ub4)k[7]<<24));
-		c += (k[8] +((ub4)k[9]<<8) +((ub4)k[10]<<16)+((ub4)k[11]<<24));
+		a += (k[0] +((UINT32)k[1]<<8) +((UINT32)k[2]<<16) +((UINT32)k[3]<<24));
+		b += (k[4] +((UINT32)k[5]<<8) +((UINT32)k[6]<<16) +((UINT32)k[7]<<24));
+		c += (k[8] +((UINT32)k[9]<<8) +((UINT32)k[10]<<16)+((UINT32)k[11]<<24));
 		mix(a,b,c);
 		k += 12; len -= 12;
 	}
@@ -86,17 +92,17 @@ ub4 hash( register ub1 *k, register ub4 length, register ub4 initval)
 	c += length;
 	switch(len)		/* all the case statements fall through */
 	{
-		case 11: c+=((ub4)k[10]<<24);
-		case 10: c+=((ub4)k[9]<<16);
-		case 9 : c+=((ub4)k[8]<<8);
+		case 11: c+=((UINT32)k[10]<<24);
+		case 10: c+=((UINT32)k[9]<<16);
+		case 9 : c+=((UINT32)k[8]<<8);
 		/* the first byte of c is reserved for the length */
-		case 8 : b+=((ub4)k[7]<<24);
-		case 7 : b+=((ub4)k[6]<<16);
-		case 6 : b+=((ub4)k[5]<<8);
+		case 8 : b+=((UINT32)k[7]<<24);
+		case 7 : b+=((UINT32)k[6]<<16);
+		case 6 : b+=((UINT32)k[5]<<8);
 		case 5 : b+=k[4];
-		case 4 : a+=((ub4)k[3]<<24);
-		case 3 : a+=((ub4)k[2]<<16);
-		case 2 : a+=((ub4)k[1]<<8);
+		case 4 : a+=((UINT32)k[3]<<24);
+		case 3 : a+=((UINT32)k[2]<<16);
+		case 2 : a+=((UINT32)k[1]<<8);
 		case 1 : a+=k[0];
 		/* case 0: nothing left to add */
 	}
@@ -104,7 +110,7 @@ ub4 hash( register ub1 *k, register ub4 length, register ub4 initval)
 
 	/* report the result */
 	return c;
-} /* hash */
+} /* jenkins_hash */
 
 
 /* -eof- */
diff --git a/src/ngircd/hash.h b/src/ngircd/hash.h
index 80caed89..aacce61d 100644
--- a/src/ngircd/hash.h
+++ b/src/ngircd/hash.h
@@ -9,7 +9,7 @@
  * Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
  * der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
  *
- * $Id: hash.h,v 1.1 2002/03/14 15:31:22 alex Exp $
+ * $Id: hash.h,v 1.2 2002/03/14 15:49:36 alex Exp $
  *
  * hash.h: Hash-Werte berechnen (Header)
  */
@@ -19,6 +19,9 @@
 #define __hash_h__
 
 
+GLOBAL UINT32 Hash( CHAR *String );
+
+
 #endif