Add support for CD-Guard (#181)

* why is there so much DRM I am going to cry

* Add support for detecting CD-Guard, as well as notes.

* Add CD-Guard to README.

* Address PR comments

* Ignore case in import/export checks.

BurnOutSharp/ProtectionType/CDGuard.cs

@@ -0,0 +1,81 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using BurnOutSharp.Interfaces;
+using BurnOutSharp.Matching;
+using BurnOutSharp.Wrappers;
+
+namespace BurnOutSharp.ProtectionType
+{
+    /// <summary>
+    /// CD-Guard is a DRM from Russia that's similar to CD-Cops and may be related to StarForce, meaning it likely needs DPM.
+    /// It may have been developed by Russobit-M, though the same source also says that StarForce was created by the same company as well, which seems unlikely (https://m.linkdatasecurity.com/pnews6.htm).
+    /// Others online have been confused by this as well (https://forum.ixbt.com/topic.cgi?id=31:009712).
+    /// A game referred to as having CD-Guard by http://lastboss.ru/games/RUS/randevu-s-neznakomkoi-2 that was published by Russobit-M is known to have an early version of StarForce (Redump entry 97088).
+    /// The FAQ on the game's official website indicates that StarForce specifically is present (https://web.archive.org/web/20011220224222/http://www.aha.ru/~exe_soft/russian/exesoft.htm). 
+    /// It's unknown for sure if there were two separate versions of this game that contained separate protections, or if the game never actually contained CD-Guard, or if CD-Guard was an early name for the StarForce line of products.
+    /// There is a re-release of an earlier game by the same developer that seems to include both CD-Guard and StarForce drivers, with the CD-Guard driver seemingly not used during installation, nor installed onto the system (IA item "pahgeby-he3hakomkou").
+    /// 
+    /// Additional resources and references:
+    /// https://gamecopyworld.com/games/pc_omikron.shtml
+    /// https://forum.ixbt.com/topic.cgi?id=31:3985
+    /// </summary>
+    public class CDGuard : IPathCheck, IPortableExecutableCheck
+    {
+        /// <inheritdoc/>
+        public string CheckPortableExecutable(string file, PortableExecutable pex, bool includeDebug)
+        {
+            // Get the sections from the executable, if possible
+            var sections = pex?.SectionTable;
+            if (sections == null)
+                return null;
+
+            // TODO: Investigate the numerous ".guard" sections present in "Randevu.exe" in Redump entry 97142.
+
+            // Get the export directory table
+            if (pex.ExportTable?.ExportDirectoryTable != null)
+            {
+                // Found in "cdguard.dll" in Redump entry 97142 and IA item "pahgeby-he3hakomkou".
+                bool match = pex.ExportTable.ExportDirectoryTable.Name?.Equals("cdguard.dll", StringComparison.OrdinalIgnoreCase) == true;
+                if (match)
+                    return "CD-Guard Copy Protection System";
+            }
+
+            // Get the import directory table
+            if (pex.ImportTable?.ImportDirectoryTable != null)
+            {
+                // Found in "Randevu.exe" in Redump entry 97142.
+                bool match = pex.ImportTable.ImportDirectoryTable.Any(idte => idte.Name?.Equals("cdguard.dll", StringComparison.OrdinalIgnoreCase) == true);
+                if (match)
+                      return "CD-Guard Copy Protection System";
+            }
+
+            return null;
+        }
+
+        /// <inheritdoc/>
+        public ConcurrentQueue<string> CheckDirectoryPath(string path, IEnumerable<string> files)
+        {
+            var matchers = new List<PathMatchSet>
+            {
+                // Found in Redump entry 97142.
+                new PathMatchSet(new PathMatch("cdguard.dll", useEndsWith: true), "CD-Guard Copy Protection System"),
+            };
+
+            return MatchUtil.GetAllMatches(files, matchers, any: true);
+        }
+
+        /// <inheritdoc/>
+        public string CheckFilePath(string path)
+        {
+            var matchers = new List<PathMatchSet>
+            {
+                // Found in Redump entry 97142.
+                new PathMatchSet(new PathMatch("cdguard.dll", useEndsWith: true), "CD-Guard Copy Protection System"),
+            };
+
+            return MatchUtil.GetFirstMatch(path, matchers, any: true);
+        }
+    }
+}

README.md

@@ -37,6 +37,7 @@ Below is a list of protections detected by BurnOutSharp. The two columns explain
 | C-Dilla License Management Solution / CD-Secure / CD-Compress | True | True | |
 | Cactus Data Shield | True | True | |
 | CD-Cops / DVD-Cops | True | True | Partially unconfirmed² |
+| CD-Guard | True | True | |
 | CD-Lock | True | True | |
 | CD-Protector | False | True | |
 | CD-X | False | True | Unconfirmed¹ |