Ram Search - implemented Diff By Specific Address (yeah, that one is really pointless, but might as well)

BizHawk.MultiClient/tools/RamSearch.Designer.cs

@@ -673,7 +673,6 @@
             // DifferentByRadio
             // 
             this.DifferentByRadio.AutoSize = true;
-            this.DifferentByRadio.Enabled = false;
             this.DifferentByRadio.Location = new System.Drawing.Point(7, 134);
             this.DifferentByRadio.Name = "DifferentByRadio";
             this.DifferentByRadio.Size = new System.Drawing.Size(83, 17);

BizHawk.MultiClient/tools/RamSearch.cs

@@ -474,8 +474,15 @@ namespace BizHawk.MultiClient
             bool i = InputValidate.IsValidHexNumber(SpecificAddressBox.Text);
             if (!i) return -1;
 
-            int x =  int.Parse(SpecificAddressBox.Text.ToUpper().Trim(), NumberStyles.HexNumber);
+            return int.Parse(SpecificAddressBox.Text.ToUpper().Trim(), NumberStyles.HexNumber);
-            return x;
+        }
+
+        private int GetDifferentBy()
+        {
+            bool i = InputValidate.IsValidUnsignedNumber(DifferentByBox.Text);
+            if (!i) return -1;
+
+            return int.Parse(DifferentByBox.Text.ToUpper().Trim());
         }
 
         private bool DoSpecificAddress()
@@ -533,7 +540,21 @@ namespace BizHawk.MultiClient
                     }
                     break;
                 case SOperator.DIFFBY:
-                    //TODO
+                    {
+                        int diff = GetDifferentBy();
+                        if (diff < 0)
+                        {
+                            MessageBox.Show("Missing or invalid Different By value", "Invalid value", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                            DifferentByBox.Focus();
+                            DifferentByBox.SelectAll();
+                            return false;
+                        }
+                        for (int x = 0; x < searchList.Count; x++)
+                        {
+                            if (searchList[x].address == address + diff || searchList[x].address == address - diff)
+                                weededList.Add(searchList[x]);
+                        }
+                    }
                     break;
                 case SOperator.MODULUS:
                     //TODO