Initial commit

ClassicShellSrc/ClassicShellLib/FNVHash.cpp

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+// Classic Shell (c) 2009-2016, Ivo Beltchev
+// Confidential information of Ivo Beltchev. Not for disclosure or distribution without prior written consent from the author
+
+#include <stdafx.h>
+#include "FNVHash.h"
+#include "StringUtils.h"
+
+// FNV hash algorithm as described here: http://www.isthe.com/chongo/tech/comp/fnv/index.html
+
+// Calculate FNV hash for a memory buffer
+unsigned int CalcFNVHash( const void *buf, int len, unsigned int hash )
+{
+	for (int i=0;i<len;i++)
+		hash=(hash^((const unsigned char*)buf)[i])*16777619;
+	return hash;
+}
+
+// Calculate FNV hash for a string
+unsigned int CalcFNVHash( const char *text, unsigned int hash )
+{
+	return CalcFNVHash(text,Strlen(text),hash);
+}
+
+// Calculate FNV hash for a wide string
+unsigned int CalcFNVHash( const wchar_t *text, unsigned int hash )
+{
+	return CalcFNVHash(text,Strlen(text)*2,hash);
+}