Add support for detecting NSIS (#14)

BurnOutSharp/FileType/Executable.cs

@@ -172,7 +172,12 @@ namespace BurnOutSharp.FileType
             protection = LaserLock.CheckContents(file, fileContent, includePosition);
             if (!string.IsNullOrWhiteSpace(protection))
                 protections.Add(protection);
-
+			
+			// NSIS
+			protection = NSIS.CheckContents(fileContent, includePosition);
+            if (!string.IsNullOrWhiteSpace(protection))
+                protections.Add(protection);
+			
             // PE Compact
             protection = PECompact.CheckContents(fileContent, includePosition);
             if (!string.IsNullOrWhiteSpace(protection))

BurnOutSharp/ProtectionType/NSIS.cs

@@ -0,0 +1,47 @@
+using System.Text;
+using System;
+using System.Linq;
+
+namespace BurnOutSharp.ProtectionType
+{
+    public class NSIS
+    {
+        public static string CheckContents(byte[] fileContent, bool includePosition = false)
+        {
+            // Nullsoft Install System
+            byte[] check = new byte[] { 0x4e, 0x75, 0x6c, 0x6c, 0x73, 0x6f, 0x66, 0x74, 0x20, 0x49, 0x6e, 0x73, 0x74, 0x61, 0x6c, 0x6c, 0x20, 0x53, 0x79, 0x73, 0x74, 0x65, 0x6d };
+            if (fileContent.Contains(check, out int position))
+            {
+				string version = GetVersion(fileContent, position);
+                return $"NSIS {version}" + (includePosition ? $" (Index {position})" : string.Empty);
+            }
+			
+			// NullsoftInst
+			check = new byte[] { 0x4e, 0x75, 0x6c, 0x6c, 0x73, 0x6f, 0x66, 0x74, 0x49, 0x6e, 0x73, 0x74 };
+            if (fileContent.Contains(check, out position))
+            {
+                return $"NSIS" + (includePosition ? $" (Index {position})" : string.Empty);
+            }
+			
+            return null;
+        }
+		
+		 private static string GetVersion(byte[] fileContent, int index)
+        {
+            try
+            {
+                index += 24;
+				if (fileContent[index] != 'v')
+					return "(Unknown Version)";
+				var versionBytes = new ReadOnlySpan<byte>(fileContent, index, 16).ToArray();
+				var onlyVersion = versionBytes.TakeWhile(b => b != '<').ToArray();
+				string versionString = Encoding.ASCII.GetString(onlyVersion);
+				return versionString;
+            }
+            catch
+            {
+                return "(Unknown Version)";
+            }
+		}
+    }
+}

README.md

@@ -56,6 +56,7 @@ Below is a list of the protections that can be detected using this code:
 - LaserLock
 - MediaCloQ
 - MediaMax CD3
+- NSIS
 - Origin (partial)
 - ProtectDisc
 - Protect DVD-Video