From ed182eb425ce67a0112dffb3503a6ac38979af86 Mon Sep 17 00:00:00 2001
From: Christian Treffs <ctreffs@gmail.com>
Date: Thu, 9 Jul 2020 22:25:10 +0200
Subject: [PATCH] Make string hash functions return UInt64 based. - These are
 used to produce a stable hash, so we want all platforms to produce the same
 hash value, therefore we use UInt64

---
 Sources/FirebladeECS/Hashing.swift | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/Sources/FirebladeECS/Hashing.swift b/Sources/FirebladeECS/Hashing.swift
index 9c2ed41..29b228d 100644
--- a/Sources/FirebladeECS/Hashing.swift
+++ b/Sources/FirebladeECS/Hashing.swift
@@ -91,10 +91,10 @@ public enum StringHashing {
     ///
     /// <https://stackoverflow.com/a/43149500>
     public static func singer_djb2(_ utf8String: String) -> UInt64 {
-        var hash = UInt64(5381)
+        var hash: UInt64 = 5381
         var iter = utf8String.unicodeScalars.makeIterator()
         while let char = iter.next() {
-            hash = 127 * (hash & 0x00ffffffffffffff) &+ UInt64(char.value)
+            hash = 127 * (hash & 0xFFFFFFFFFFFFFF) &+ UInt64(char.value)
         }
         return hash
     }
@@ -106,11 +106,11 @@ public enum StringHashing {
     /// The magic of number 33 (why it works better than many other constants, prime or not) has never been adequately explained.
     ///
     /// <http://www.cse.yorku.ca/~oz/hash.html>
-    public static func bernstein_djb2(_ string: String) -> UInt {
-        var hash: UInt = 5381
+    public static func bernstein_djb2(_ string: String) -> UInt64 {
+        var hash: UInt64 = 5381
         var iter = string.unicodeScalars.makeIterator()
         while let char = iter.next() {
-            hash = (hash << 5) &+ hash &+ UInt(char.value)
+            hash = (hash << 5) &+ hash &+ UInt64(char.value)
         }
         return hash
     }
@@ -122,11 +122,11 @@ public enum StringHashing {
     /// It also happens to be a good general hashing function with good distribution.
     ///
     /// <http://www.cse.yorku.ca/~oz/hash.html>
-    public static func sdbm(_ string: String) -> UInt {
-        var hash: UInt = 0
+    public static func sdbm(_ string: String) -> UInt64 {
+        var hash: UInt64 = 0
         var iter = string.unicodeScalars.makeIterator()
         while let char = iter.next() {
-            hash = (UInt(char.value) &+ (hash << 6) &+ (hash << 16))
+            hash = (UInt64(char.value) &+ (hash << 6) &+ (hash << 16))
         }
         return hash
     }