Restored recommendations based on acoustic similarities (using musicnn), fixes #301

src/libs/core/impl/XxHash3.cpp

@@ -18,14 +18,38 @@
  */
 
 #include "core/XxHash3.hpp"
+#include "core/Exception.hpp"
 
 #define XXH_INLINE_ALL
 #include <xxhash.h>
 
 namespace lms::core
 {
-    std::uint64_t xxHash3_64(std::span<const std::byte> buf)
+    std::uint64_t XxHash3_64::hash(std::span<const std::byte> buf)
     {
         return XXH3_64bits(buf.data(), buf.size());
     }
+
+    XxHash3_64::XxHash3_64()
+        : _state{ XXH3_createState() }
+    {
+        if (!_state)
+            throw LmsException{ "XXH3_createState failed: out of memory" };
+        XXH3_64bits_reset(static_cast<XXH3_state_t*>(_state));
+    }
+
+    XxHash3_64::~XxHash3_64()
+    {
+        XXH3_freeState(static_cast<XXH3_state_t*>(_state));
+    }
+
+    void XxHash3_64::update(std::span<const std::byte> buf)
+    {
+        XXH3_64bits_update(static_cast<XXH3_state_t*>(_state), buf.data(), buf.size());
+    }
+
+    std::uint64_t XxHash3_64::digest() const
+    {
+        return XXH3_64bits_digest(static_cast<const XXH3_state_t*>(_state));
+    }
 } // namespace lms::core