From 5b4d2736a825c314047fb4eb4286ff5690dcba6e Mon Sep 17 00:00:00 2001
From: j v <vantjac@gmail.com>
Date: Fri, 17 Jun 2022 21:06:20 -0700
Subject: [PATCH] Custom hash algorithm for CLSID

---
 src/PreviewWindow.cpp | 9 +++++++--
 src/main.cpp          | 1 -
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/PreviewWindow.cpp b/src/PreviewWindow.cpp
index 8a80e7b..1c259f4 100644
--- a/src/PreviewWindow.cpp
+++ b/src/PreviewWindow.cpp
@@ -8,8 +8,13 @@
 template<>
 struct std::hash<CLSID> {
     std::size_t operator() (const CLSID &key) const {
-        RPC_STATUS status;
-        return std::hash<unsigned short>()(UuidHash((UUID *)&key, &status));
+        // https://stackoverflow.com/a/263416
+        size_t hash = 17;
+        for (int i = 0; i < 4; i++) {
+            uint32_t dword = ((uint32_t *)&key)[i];
+            hash = hash * 23 + std::hash<uint32_t>()(dword);
+        }
+        return hash;
     }
 };
 
diff --git a/src/main.cpp b/src/main.cpp
index 84df433..da5a406 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -14,7 +14,6 @@
 #pragma comment(lib, "Gdi32.lib")
 #pragma comment(lib, "UxTheme.lib")
 #pragma comment(lib, "Comctl32.lib")
-#pragma comment(lib, "Rpcrt4.lib")
 
 const wchar_t *APP_ID = L"chroma.browse";