Potential fix for code scanning alert no. 32: Complex condition

.editorconfig

@@ -10,7 +10,6 @@ indent_style = space
 # Code files
 [*.{cs,csx}]
 indent_size = 4
-end_of_line = lf
 
 # XML project files
 [*.{csproj,vbproj,vcxproj,vcxproj.filters,proj,projitems,shproj}]

src/TypeGuard.Core/Rules/IpAddressRules.cs

@@ -37,17 +37,8 @@ public class PrivateIpRule(string? customMessage = null) : IValidatorRule<IPAddr
     /// <inheritdoc/>
     public bool IsValid(IPAddress value)
     {
-        if (value.AddressFamily != AddressFamily.InterNetwork)
-        {
-            return false;
-        }
-
-        byte[] b = value.GetAddressBytes();
-
-        return b[0] == 10
-            || b[0] == 172 && b[1] >= 16 && b[1] <= 31
-            || b[0] == 192 && b[1] == 168
-            || b[0] == 169 && b[1] == 254;
+        return value.AddressFamily == AddressFamily.InterNetwork
+            && IpAddressHelper.IsPrivateIpv4(value.GetAddressBytes());
     }
 
     /// <inheritdoc/>
@@ -124,24 +115,11 @@ public class PublicIpRule(string? customMessage = null) : IValidatorRule<IPAddre
     /// <inheritdoc/>
     public bool IsValid(IPAddress value)
     {
-        if (IPAddress.IsLoopback(value))
-        {
-            return false;
-        }
-
-        if (value.AddressFamily != AddressFamily.InterNetwork)
-        {
-            return true;
-        }
-
-        byte[] b = value.GetAddressBytes();
-
-        return !(
-            b[0] == 10
-            || b[0] == 172 && b[1] >= 16 && b[1] <= 31
-            || b[0] == 192 && b[1] == 168
-            || b[0] == 169 && b[1] == 254
-        );
+        return !IPAddress.IsLoopback(value)
+            && (
+                value.AddressFamily != AddressFamily.InterNetwork
+                || !IpAddressHelper.IsPrivateIpv4(value.GetAddressBytes())
+            );
     }
 
     /// <inheritdoc/>
@@ -285,3 +263,16 @@ private static HashSet<IPAddress> BuildSet(IEnumerable<IPAddress> values, string
         return set.Count == 0 ? throw new ArgumentException("Cannot be empty.", paramName) : set;
     }
 }
+
+internal static class IpAddressHelper
+{
+    internal static bool IsPrivateIpv4(byte[] addressBytes)
+    {
+        bool is10Range = addressBytes[0] == 10;
+        bool is172Range = addressBytes[0] == 172 && addressBytes[1] >= 16 && addressBytes[1] <= 31;
+        bool is192Range = addressBytes[0] == 192 && addressBytes[1] == 168;
+        bool isApipaRange = addressBytes[0] == 169 && addressBytes[1] == 254;
+
+        return is10Range || is172Range || is192Range || isApipaRange;
+    }
+}