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diff --git a/oss-fuzz/fuzzing/datasource/id.hpp b/oss-fuzz/fuzzing/datasource/id.hpp
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+/* Copyright 2019 Guido Vranken
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject
+ * to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#pragma once
+
+#include <stdio.h>
+#include <stdint.h>
+#include <utility>
+#include <map>
+
+namespace fuzzing {
+namespace datasource  {
+
+/* From: https://gist.github.com/underscorediscovery/81308642d0325fd386237cfa3b44785c */
+inline uint64_t hash_64_fnv1a(const void* key, const uint64_t len) {
+
+    const char* data = (char*)key;
+    uint64_t hash = 0xcbf29ce484222325;
+    uint64_t prime = 0x100000001b3;
+
+    for(uint64_t i = 0; i < len; ++i) {
+        uint8_t value = data[i];
+        hash = hash ^ value;
+        hash *= prime;
+    }
+
+    return hash;
+
+} //hash_64_fnv1a
+
+// FNV1a c++11 constexpr compile time hash functions, 32 and 64 bit
+// str should be a null terminated string literal, value should be left out 
+// e.g hash_32_fnv1a_const("example")
+// code license: public domain or equivalent
+// post: https://notes.underscorediscovery.com/constexpr-fnv1a/
+
+constexpr uint32_t val_32_const = 0x811c9dc5;
+constexpr uint32_t prime_32_const = 0x1000193;
+constexpr uint64_t val_64_const = 0xcbf29ce484222325;
+constexpr uint64_t prime_64_const = 0x100000001b3;
+
+
+inline constexpr uint64_t ID(const char* const str, const uint64_t value = val_64_const) noexcept {
+    auto ret = (str[0] == '\0') ? value : ID(&str[1], (value ^ uint64_t(str[0])) * prime_64_const);
+    return ret;
+}
+
+inline constexpr std::pair<const char*, uint64_t> IDPair(const char* const str, const uint64_t value = val_64_const) noexcept {
+    return {str, ID(str, value)};
+}
+
+using IDMap = std::map<const char*, uint64_t>;
+
+} /* namespace datasource */
+} /* namespace fuzzing */