Contrib: Added client patcher, original author @Fabi

contrib/Connection Patcher/Patcher.cs

@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2012-2014 Arctium Emulation <http://arctium.org>
+ * Copyright (C) 2008-2014 TrinityCore <http://www.trinitycore.org/>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using Connection_Patcher.Constants;
+using System;
+using System.IO;
+
+namespace Connection_Patcher
+{
+    class Patcher : IDisposable
+    {
+        public string Binary { get; set; }
+        public bool Initialized { get; private set; }
+        public BinaryTypes Type { get; private set; }
+
+        public byte[] binary;
+        bool success;
+
+        public Patcher(string file)
+        {
+            Initialized = false;
+            success = false;
+
+            using (var stream = new MemoryStream(File.ReadAllBytes(file)))
+            {
+                Binary = file;
+                binary = stream.ToArray();
+
+                if (binary != null)
+                {
+                    Type = Helper.GetBinaryType(binary);
+
+                    Initialized = true;
+                }
+            }
+        }
+
+        public void Patch(byte[] bytes, byte[] pattern, long address = 0)
+        {
+            if (Initialized && (address != 0 || binary.Length >= pattern.Length))
+            {
+                var offset = pattern == null ? address : SearchOffset(pattern);
+                Console.WriteLine("Found offset {0}", offset);
+
+                if (offset != 0 && binary.Length >= bytes.Length)
+                {
+                    try
+                    {
+                        for (int i = 0; i < bytes.Length; i++)
+                            binary[offset + i] = bytes[i];
+                    }
+                    catch (Exception ex)
+                    {
+                        throw new NotSupportedException(ex.Message);
+                    }
+                }
+            }
+        }
+
+        long SearchOffset(byte[] pattern)
+        {
+            var matches = 0;
+
+            for (long i = 0; i < binary.Length; i++)
+            {
+                matches = 0;
+
+                for (int j = 0; j < pattern.Length; j++)
+                {
+                    if (pattern.Length > (binary.Length - i))
+                        return 0;
+
+                    if (pattern[j] == 0)
+                    {
+                        matches++;
+                        continue;
+                    }
+
+                    if (binary[i + j] != pattern[j])
+                        break;
+
+                    matches++;
+                }
+
+                if (matches == pattern.Length)
+                    return i;
+            }
+
+            return 0;
+        }
+
+        public void Finish()
+        {
+            success = true;
+        }
+
+        public void Dispose()
+        {
+            try
+            {
+                if (File.Exists(Binary))
+                    File.Delete(Binary);
+
+                if (success)
+                    File.WriteAllBytes(Binary, binary);
+            }
+            catch (UnauthorizedAccessException)
+            {
+
+            }
+
+            binary = null;
+        }
+    }
+}