Add hash macro fn

diff --git a/src/UDPC_Defines.h b/src/UDPC_Defines.h
index 77088e7d7381fcd4e0407e3e82349b6b766faf7a..98dbe25dded389e2e24a2e477e5d4269916aaffe 100644 (file)
--- a/src/UDPC_Defines.h
+++ b/src/UDPC_Defines.h
@@ -49,4 +49,18 @@ static const char *UDPC_ERR_THREADFAIL_STR = "Failed to create thread";
 
 #define UDPC_PACKET_MAX_SIZE 8192
 
+// 5 8 2 7 3 6 1
+// 3 2 5 1 8 7 6
+#define UDPC_HASH32(x) ( \
+    ( \
+      ((x & 0xF8000000) >> 5) \
+      ((x & 0x07F80000) >> 6) \
+      ((x & 0x00060000) << 10) \
+      ((x & 0x0001FC00) >> 4) \
+      ((x & 0x00000380) << 22) \
+      ((x & 0x0000007E) >> 1) \
+      ((x & 0x00000001) << 21) \
+    ) ^ 0x96969696 \
+)
+
 #endif