add sophos and mcafee scan backend

MalwareMultiScan.Backends/Backends/Implementations/SophosScanBackend.cs

@@ -0,0 +1,32 @@
+using System;
+using System.IO;
+using System.Text.RegularExpressions;
+using MalwareMultiScan.Backends.Backends.Abstracts;
+using Microsoft.Extensions.Logging;
+
+namespace MalwareMultiScan.Backends.Backends.Implementations
+{
+    public class SophosScanBackend : AbstractLocalProcessScanBackend
+    {
+        public SophosScanBackend(ILogger logger) : base(logger)
+        {
+        }
+        
+        public override string Id { get; } = "sophos";
+        
+        public override DateTime DatabaseLastUpdate =>
+            File.GetLastWriteTime("/opt/sophos-av/lib/sav/vdlsync.upd");
+
+        protected override string BackendPath { get; } = "/opt/sophos-av/bin/savscan";
+
+        protected override bool ThrowOnNonZeroExitCode { get; } = false;
+
+        protected override Regex MatchRegex { get; } =
+            new Regex(@">>> Virus '(?<threat>.*)' found in file .*", RegexOptions.Compiled | RegexOptions.Multiline);
+
+        protected override string GetBackendArguments(string path)
+        {
+            return $"-f -archive -ss {path}";
+        }
+    }
+}