Add stream extensions for reading basic types.

OpenRA.FileFormats/StreamExts.cs

@@ -11,11 +11,74 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Text;
 
 namespace OpenRA
 {
 	public static class StreamExts
 	{
+		public static byte[] ReadBytes(this Stream s, int count)
+		{
+			if (count < 0)
+				throw new ArgumentOutOfRangeException("count", "Non-negative number required.");
+
+			var buf = new byte[count];
+			if (s.Read(buf, 0, count) < count)
+				throw new EndOfStreamException();
+
+			return buf;
+		}
+
+		public static int Peek(this Stream s)
+		{
+			var buf = new byte[1];
+			if (s.Read(buf, 0, 1) == 0)
+				return -1;
+
+			s.Seek(s.Position - 1, SeekOrigin.Begin);
+			return buf[0];
+		}
+
+		public static byte ReadUInt8(this Stream s)
+		{
+			return s.ReadBytes(1)[0];
+		}
+
+		public static ushort ReadUInt16(this Stream s)
+		{
+			return BitConverter.ToUInt16(s.ReadBytes(2), 0);
+		}
+
+		public static short ReadInt16(this Stream s)
+		{
+			return BitConverter.ToInt16(s.ReadBytes(2), 0);
+		}
+
+		public static uint ReadUInt32(this Stream s)
+		{
+			return BitConverter.ToUInt32(s.ReadBytes(4), 0);
+		}
+
+		public static int ReadInt32(this Stream s)
+		{
+			return BitConverter.ToInt32(s.ReadBytes(4), 0);
+		}
+
+		public static float ReadFloat(this Stream s)
+		{
+			return BitConverter.ToSingle(s.ReadBytes(4), 0);
+		}
+
+		public static double ReadDouble(this Stream s)
+		{
+			return BitConverter.ToDouble(s.ReadBytes(8), 0);
+		}
+
+		public static string ReadASCII(this Stream s, int length)
+		{
+			return new string(Encoding.ASCII.GetChars(s.ReadBytes(length)));
+		}
+
 		public static string ReadAllText(this Stream s)
 		{
 			using (s)