From 0fcec4d9719662e4cc75c3147d22dc202bca3bd2 Mon Sep 17 00:00:00 2001
From: citizen <a_mirre@utb.cz>
Date: Tue, 21 Jan 2020 05:51:39 +0100
Subject: [PATCH] added fix preventing input of literal zero

* ...as it is the termination character, by which we can tell the end of a message
---
 main_form.Designer.cs |  1 +
 main_form.cs          | 15 ++++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/main_form.Designer.cs b/main_form.Designer.cs
index 5d0a34a..a8d3b2a 100644
--- a/main_form.Designer.cs
+++ b/main_form.Designer.cs
@@ -76,6 +76,7 @@
             this.textBox1putm.Name = "textBox1putm";
             this.textBox1putm.Size = new System.Drawing.Size(342, 66);
             this.textBox1putm.TabIndex = 3;
+            this.textBox1putm.TextChanged += new System.EventHandler(this.textBox1putm_TextChanged);
             // 
             // label2
             // 
diff --git a/main_form.cs b/main_form.cs
index 0aaeec8..46259cd 100644
--- a/main_form.cs
+++ b/main_form.cs
@@ -187,7 +187,6 @@ namespace KRY_0x02
                 //{
                 //    output = main_output;
                 //}
-                MessageBox.Show("success!","done");
                 return output;
             }
         }
@@ -218,6 +217,7 @@ namespace KRY_0x02
             do_a_stego do_A_Stego = new do_a_stego();
             Bitmap b = new Bitmap(pictureBox1.Image);
             textBox2getm.Text = do_A_Stego.gimme(b);
+            MessageBox.Show("success!", "done");
         }
 
 
@@ -315,5 +315,18 @@ namespace KRY_0x02
                 MessageBox.Show($"saved to {name}", "gj, file saved!");
             }
         }
+
+        private void textBox1putm_TextChanged(object sender, EventArgs e)
+        {
+            if (Regex.IsMatch(textBox1putm.Text, "0"))
+            {
+                textBox1putm.BackColor = Color.PaleVioletRed;
+                MessageBox.Show("null character is forbidden, sorry..\nmeaning it's going to be replaced", "just a note");
+                textBox1putm.Text = Regex.Replace(textBox1putm.Text, "0", "nullchar");
+                textBox1putm.Select(textBox1putm.Text.Length, 0);
+                textBox1putm.BackColor = Color.White;
+                return;
+            }
+        }
     }
 }