From 9cd9c99e4bb4bbace8ba2d4a2dbd6830750ad521 Mon Sep 17 00:00:00 2001
From: Aleksi Lindeman <0xdec05eba@gmail.com>
Date: Tue, 13 Feb 2018 00:46:46 +0100
Subject: Add database storage (in memory), need to store it on disk later

---
 include/Key.hpp | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

(limited to 'include/Key.hpp')

diff --git a/include/Key.hpp b/include/Key.hpp
index 505050d..f7a600b 100644
--- a/include/Key.hpp
+++ b/include/Key.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <opendht/infohash.h>
+#include <unordered_map>
 
 namespace odhtdb
 {
@@ -12,4 +13,32 @@ namespace odhtdb
         
         dht::InfoHash hashedKey;
     };
-}
\ No newline at end of file
+    
+    // Source: https://stackoverflow.com/a/11414104 (public license)
+    static unsigned int fnvHash(const unsigned char *key, int len)
+    {
+        unsigned int h = 2166136261;
+        for (int i = 0; i < len; i++)
+            h = (h * 16777619) ^ key[i];
+        return h;
+    }
+    
+    struct KeyHash
+    {
+        size_t operator()(const Key &key) const
+        {
+            return fnvHash(key.hashedKey.data(), key.hashedKey.size());
+        }
+    };
+    
+    struct KeyCompare
+    {
+        bool operator()(const Key &lhs, const Key &rhs) const
+        {
+            return lhs.hashedKey == rhs.hashedKey;
+        }
+    };
+    
+    template <typename ValueType>
+    using KeyMap = std::unordered_map<Key, ValueType, KeyHash, KeyCompare>;
+}
-- 
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