hash/simple: add simple oneshot hash calculator

Makefile.am

@@ -107,6 +107,8 @@ UTIL_FILES   =			\
     guid.cpp			\
     guid.hpp			\
     hash.hpp			\
+    hash/simple.hpp		\
+    hash/simple.cpp		\
     hash/adler.cpp		\
     hash/adler.hpp		\
     hash/bsdsum.cpp		\

hash/simple.cpp

@@ -0,0 +1,17 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2016, Danny Robson <danny@nerdcruft.net>
+ */
+
+#include "./simple.hpp"

hash/simple.hpp

@@ -0,0 +1,42 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2016, Danny Robson <danny@nerdcruft.net>
+ */
+
+#ifndef __UTIL_HASH_SIMPLE_HPP
+#define __UTIL_HASH_SIMPLE_HPP
+
+#include <cstdint>
+
+
+///////////////////////////////////////////////////////////////////////////////
+namespace util { namespace hash {
+    //template <class H, class InputT>
+    template <class H>
+    typename H::digest_t
+    simple (const void *restrict first, const void *restrict last) noexcept
+    {
+        H h;
+
+        h.update (
+            static_cast<const uint8_t*restrict> (first),
+            static_cast<const uint8_t *restrict> (last)
+        );
+        h.finish ();
+
+        return h.digest ();
+    }
+} }
+
+#endif