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Patches/Patch.cs

@@ -0,0 +1,104 @@
+using System.Runtime.InteropServices;
+using CounterStrikeSharp.API.Core;
+using CounterStrikeSharp.API.Modules.Memory;
+
+namespace WeaponPaints;
+
+// Thanks cssharp-fixes
+public static class Patch
+{
+    private static IntPtr GetAddress(string modulePath, string signature)
+    {
+        // Returns address if found, otherwise a C++ nullptr which is a IntPtr.Zero in C#
+        var address = NativeAPI.FindSignature(modulePath, signature);
+        
+        return address;
+    }
+
+    public static void PerformPatch(string signature, string patch)
+    {
+        IntPtr address = GetAddress(Addresses.ServerPath, signature);
+        if(address == IntPtr.Zero)
+        {
+            return;
+        }
+        
+        WriteBytesToAddress(address, HexToByte(patch));
+    }
+
+    private static void WriteBytesToAddress(IntPtr address, List<byte> bytes)
+    {
+        int patchSize = bytes.Count;
+        if(patchSize == 0) throw new ArgumentException("Patch bytes list cannot be empty.");
+        
+        if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+        {
+            MemoryLinux.PatchBytesAtAddress(address, bytes.ToArray(), patchSize);
+        }
+        else
+        {
+            MemoryWindows.PatchBytesAtAddress(address, bytes.ToArray(), patchSize);
+        }
+    }
+
+    private static List<byte> HexToByte(string src)
+    {
+        if (string.IsNullOrEmpty(src))
+        {
+            return new List<byte>();
+        }
+
+        byte HexCharToByte(char c)
+        {
+            if (c is >= '0' and <= '9') return (byte)(c - '0');
+            if (c is >= 'A' and <= 'F') return (byte)(c - 'A' + 10);
+            if (c is >= 'a' and <= 'f') return (byte)(c - 'a' + 10);
+            return 0xFF; // Invalid hex character
+        }
+
+        List<byte> result = new List<byte>();
+        bool isCodeStyle = src[0] == '\\';
+        string pattern = isCodeStyle ? "\\x" : " ";
+        string wildcard = isCodeStyle ? "2A" : "?";
+        int pos = 0;
+
+        while (pos < src.Length)
+        {
+            int found = src.IndexOf(pattern, pos);
+            if (found == -1)
+            {
+                found = src.Length;
+            }
+
+            string str = src.Substring(pos, found - pos);
+            pos = found + pattern.Length;
+
+            if (string.IsNullOrEmpty(str)) continue;
+
+            string byteStr = str;
+
+            if (byteStr.Substring(0, wildcard.Length) == wildcard)
+            {
+                result.Add(0xFF); // Representing wildcard as 0xFF
+                continue;
+            }
+
+            if (byteStr.Length < 2)
+            {
+                return new List<byte>(); // Invalid byte length
+            }
+
+            byte high = HexCharToByte(byteStr[0]);
+            byte low = HexCharToByte(byteStr[1]);
+
+            if (high == 0xFF || low == 0xFF)
+            {
+                return new List<byte>(); // Invalid hex character
+            }
+
+            result.Add((byte)((high << 4) | low));
+        }
+
+        return result;
+    }
+}