X-Git-Url: https://code.citadel.org/?p=citadel.git;a=blobdiff_plain;f=libcitadel%2Flib%2Fhash.c;fp=libcitadel%2Flib%2Fhash.c;h=665e39b304cd43bf81127a26a9f2d9106b14bfa0;hp=c1e8d4d422bc16b81295b2802257d9f29a8b45d2;hb=0b309a2b8cf939c7a0f5c765a2ab64f8df23c511;hpb=0831c47bc784ea659fff3fba8f537df61f1d36b1

diff --git a/libcitadel/lib/hash.c b/libcitadel/lib/hash.c
index c1e8d4d42..665e39b30 100644
--- a/libcitadel/lib/hash.c
+++ b/libcitadel/lib/hash.c
@@ -657,6 +657,29 @@ long lFlathash(const char *str, long len)
 	else return *(long*)str;
 }
 
+/**
+ * @ingroup HashListAlgorithm
+ * @brief another hashing algorithm; accepts exactly 4 characters, convert it to a hash key.
+ * @param str Our pointer to the long value
+ * @param len the length of the data pointed to; needs to be sizeof long, else we won't use it!
+ * @return the calculated hash value
+ */
+long FourHash(const char *key, long length) 
+{
+	int i;
+	int ret = 0;
+	const unsigned char *ptr = (const unsigned char*)key;
+
+	for (i = 0; i < 4; i++, ptr ++) 
+		ret = (ret << 8) | 
+			( ((*ptr >= 'a') &&
+			   (*ptr <= 'z'))? 
+			  *ptr - 'a' + 'A': 
+			  *ptr);
+
+	return ret;
+}
+
 /**
  * @ingroup HashListPrivate
  * @brief private abstract wrapper around the hashing algorithm