Move packer scans to their own library

BinaryObjectScanner.Packer/InnoSetup.cs

@@ -0,0 +1,101 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using BinaryObjectScanner.Interfaces;
+using BinaryObjectScanner.Matching;
+using BinaryObjectScanner.Wrappers;
+
+namespace BinaryObjectScanner.Packer
+{
+    // TODO: Add extraction - https://github.com/dscharrer/InnoExtract
+    // https://raw.githubusercontent.com/wolfram77web/app-peid/master/userdb.txt
+    public class InnoSetup : IExtractable, INewExecutableCheck, IPortableExecutableCheck
+    {
+        /// <inheritdoc/>
+        public string CheckNewExecutable(string file, NewExecutable nex, bool includeDebug)
+        {
+            // Check we have a valid executable
+            if (nex == null)
+                return null;
+            
+            // Check for "Inno" in the reserved words
+            if (nex.Stub_Reserved2[4] == 0x6E49 && nex.Stub_Reserved2[5] == 0x6F6E)
+            {
+                string version = GetOldVersion(file, nex);
+                if (!string.IsNullOrWhiteSpace(version))
+                    return $"Inno Setup {version}";
+                
+                return "Inno Setup (Unknown Version)";
+            }
+
+            return null;
+        }
+
+        /// <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;
+
+            // Get the .data/DATA section strings, if they exist
+            List<string> strs = pex.GetFirstSectionStrings(".data") ?? pex.GetFirstSectionStrings("DATA");
+            if (strs != null)
+            {
+                string str = strs.FirstOrDefault(s => s.StartsWith("Inno Setup Setup Data"));
+                if (str != null)
+                {
+                    return str.Replace("Inno Setup Setup Data", "Inno Setup")
+                        .Replace("(u)", "[Unicode]")
+                        .Replace("(", string.Empty)
+                        .Replace(")", string.Empty)
+                        .Replace("[Unicode]", "(Unicode)");
+                }
+            }
+
+            return null;
+        }
+
+        /// <inheritdoc/>
+        public string Extract(string file, bool includeDebug)
+        {
+            if (!File.Exists(file))
+                return null;
+
+            using (var fs = File.Open(file, FileMode.Open, FileAccess.Read, FileShare.Read))
+            {
+                return Extract(fs, file, includeDebug);
+            }
+        }
+
+        /// <inheritdoc/>
+        public string Extract(Stream stream, string file, bool includeDebug)
+        {
+            return null;
+        }
+
+        private static string GetOldVersion(string file, NewExecutable nex)
+        {
+            // Notes:
+            // Look into `SETUPLDR` in the resident-name table
+            // Look into `SETUPLDR.EXE` in the nonresident-name table
+
+            // TODO: Don't read entire file
+            // TODO: Only 64 bytes at the end of the file is needed
+            var data = nex.ReadArbitraryRange();
+            if (data != null)
+            {
+                var matchers = new List<ContentMatchSet>
+                {
+                    // "rDlPtS02" + (char)0x87 + "eVx"
+                    new ContentMatchSet(new byte?[] { 0x72, 0x44, 0x6C, 0x50, 0x74, 0x53, 0x30, 0x32, 0x87, 0x65, 0x56, 0x78 }, "1.2.16 or earlier"),
+                };
+
+                return MatchUtil.GetFirstMatch(file, data, matchers, false) ?? "Unknown 1.X";
+            }
+            
+            return "Unknown 1.X"; 
+        }
+    }
+}