Commit of a new class that got left behind...

SteamP2PInfo/ReverseTextReader.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.IO;
+
+namespace SteamP2PInfo
+{
+    public class ReverseTextReader
+    {
+        private const int LineFeedLf = 10;
+        private const int LineFeedCr = 13;
+        private readonly Stream _stream;
+        private readonly Encoding _encoding;
+
+        public bool EndOfStream => _stream.Position == 0;
+
+        public ReverseTextReader(Stream stream, Encoding encoding)
+        {
+            _stream = stream;
+            _encoding = encoding;
+            _stream.Position = _stream.Length;
+        }
+
+        public string ReadLine()
+        {
+            if (_stream.Position == 0) return null;
+
+            var line = new List<byte>();
+            var endOfLine = false;
+            while (!endOfLine)
+            {
+                var b = _stream.ReadByteFromBehind();
+
+                if (b == -1 || b == LineFeedLf)
+                {
+                    endOfLine = true;
+                }
+                line.Add(Convert.ToByte(b));
+            }
+
+            line.Reverse();
+            return _encoding.GetString(line.ToArray());
+        }
+    }
+
+    public static class StreamExtensions
+    {
+        public static int ReadByteFromBehind(this Stream stream)
+        {
+            if (stream.Position == 0) return -1;
+
+            stream.Position = stream.Position - 1;
+            var value = stream.ReadByte();
+            stream.Position = stream.Position - 1;
+            return value;
+        }
+    }
+}