Proper fix of UnsafeString on windows platforms - should fix input text and block info string.

ClassicalSharp/2D/Screens/BlockSelectScreen.cs

@@ -28,7 +28,7 @@ namespace ClassicalSharp {
 		int rows;
 		int startX, startY;
 		readonly Font font;
-		UnsafeString buffer = new UnsafeString( 96 );
+		StringBuffer buffer = new StringBuffer( 96 );
 		
 		public override void Render( double delta ) {
 			graphicsApi.Texturing = true;
@@ -130,9 +130,7 @@ namespace ClassicalSharp {
 			
 			Block block = blocksTable[selectedIndex].BlockId;
 			UpdateBlockInfoString( block );
-			string value = buffer.value;
-			if( Utils2D.needWinXpFix )
-				value = value.TrimEnd( Utils2D.trimChars );
+			string value = buffer.UpdateCachedString();
 			
 			Size size = Utils2D.MeasureSize( value, font, true );
 			int x = startX + ( blockSize * blocksPerRow ) / 2 - size.Width / 2;

ClassicalSharp/2D/Screens/FpsScreen.cs

@@ -6,10 +6,10 @@ namespace ClassicalSharp {
 	public class FpsScreen : Screen {
 		
 		readonly Font font;
-		UnsafeString text;
+		StringBuffer text;
 		public FpsScreen( Game window ) : base( window ) {
 			font = new Font( "Arial", 13 );
-			text = new UnsafeString( 96 );
+			text = new StringBuffer( 96 );
 		}
 		
 		TextWidget fpsTextWidget;
@@ -37,10 +37,8 @@ namespace ClassicalSharp {
 						.Append( ref ptr2, "), chunks/s: " ).AppendNum( ref ptr2, game.ChunkUpdates )
 						.Append( ref ptr2, ", vertices: " ).AppendNum( ref ptr2, game.Vertices );
 				}
-				string textString = text.value;
-				if( Utils2D.needWinXpFix )
-					textString = textString.TrimEnd( Utils2D.trimChars );
 				
+				string textString = text.UpdateCachedString();			
 				fpsTextWidget.SetText( textString );
 				maxDelta = 0;
 				accumulator = 0;

ClassicalSharp/2D/Utils2D.cs

@@ -12,8 +12,6 @@ namespace ClassicalSharp {
 		static Bitmap measuringBmp;
 		static Graphics measuringGraphics;
 		static Dictionary<int, SolidBrush> brushCache = new Dictionary<int, SolidBrush>( 16 );
-		internal static bool needWinXpFix;
-		internal static char[] trimChars = { '\0' };
 		
 		static Utils2D() {
 			format = StringFormat.GenericTypographic;
@@ -24,8 +22,6 @@ namespace ClassicalSharp {
 			measuringBmp = new Bitmap( 1, 1 );
 			measuringGraphics = Graphics.FromImage( measuringBmp );
 			measuringGraphics.TextRenderingHint = TextRenderingHint.AntiAlias;
-			OperatingSystem os = Environment.OSVersion;
-			needWinXpFix = os.Platform == PlatformID.Win32NT && os.Version.Major < 6;
 		}
 		
 		static SolidBrush GetOrCreateBrush( Color color ) {

ClassicalSharp/2D/Widgets/TextInputWidget.cs

@@ -19,7 +19,7 @@ namespace ClassicalSharp {
 			typingLogPos = game.ChatInputLog.Count; // Index of newest entry + 1.
 			this.font = font;
 			this.boldFont = boldFont;
-			chatInputText = new UnsafeString( 64 );
+			chatInputText = new StringBuffer( 64 );
 		}
 		
 		Texture chatInputTexture, chatCaretTexture;
@@ -27,7 +27,7 @@ namespace ClassicalSharp {
 		int caretPos = -1;
 		int typingLogPos = 0;
 		public int ChatInputYOffset;
-		internal UnsafeString chatInputText;
+		internal StringBuffer chatInputText;
 		readonly Font font, boldFont;
 		
 		public override void Render( double delta ) {
@@ -40,9 +40,7 @@ namespace ClassicalSharp {
 			X = 10;
 			DrawTextArgs caretArgs = new DrawTextArgs( graphicsApi, "_", Color.White, false );
 			chatCaretTexture = Utils2D.MakeTextTexture( boldFont, 0, 0, ref caretArgs );
-			string value = chatInputText.value;
-			if( Utils2D.needWinXpFix )
-				value = value.TrimEnd( Utils2D.trimChars );
+			string value = chatInputText.UpdateCachedString();
 			
 			if( chatInputText.Empty ) {
 				caretPos = -1;
@@ -53,9 +51,12 @@ namespace ClassicalSharp {
 				chatCaretTexture.X1 = 10 + size.Width;
 				size.Width += chatCaretTexture.Width;
 			} else {
-				Size trimmedSize = Utils2D.MeasureSize( value.Substring( 0, caretPos ), font, false );
+				string subString = chatInputText.GetSubstring( caretPos );
+				Size trimmedSize = Utils2D.MeasureSize( subString, font, false );
+				chatInputText.RestoreLength();
+				
 				chatCaretTexture.X1 = 10 + trimmedSize.Width;
-				Size charSize = Utils2D.MeasureSize( value.Substring( caretPos, 1 ), font, false );
+				Size charSize = Utils2D.MeasureSize( new String( value[caretPos], 1 ), font, false );
 				chatCaretTexture.Width = charSize.Width;
 			}
 			size.Height = Math.Max( size.Height, chatCaretTexture.Height );

ClassicalSharp/ClassicalSharp.csproj

@@ -164,7 +164,7 @@
     <Compile Include="Utils\TerrainAtlas1D.cs" />
     <Compile Include="Utils\TerrainAtlas2D.cs" />
     <Compile Include="Utils\TextureRectangle.cs" />
-    <Compile Include="Utils\UnsafeString.cs" />
+    <Compile Include="Utils\StringBuffer.cs" />
     <Compile Include="Utils\Utils.cs" />
     <Compile Include="Utils\Vector3I.cs" />
   </ItemGroup>

ClassicalSharp/Utils/StringBuffer.cs

@@ -0,0 +1,180 @@
+using System;
+using System.Reflection;
+
+namespace ClassicalSharp {
+	
+	// Class used to minimise memory allocations of strings.
+	// Really, only useful for FpsScreen and TextInputWidget as they allocate lots of very small strings.
+	// Seriously, you should *not* use this anywhere else, as Empty and Length are O(N).
+	internal sealed unsafe class StringBuffer {
+		
+		internal string value;
+		internal int capacity;
+		
+		static readonly FieldInfo arrayField, lengthField;
+		static bool supportsLengthSetting;
+		
+		static StringBuffer() {
+			if( OpenTK.Configuration.RunningOnMono )
+				return;
+			
+			arrayField = typeof( String ).GetField( "m_arrayLength", BindingFlags.NonPublic | BindingFlags.Instance );
+			lengthField = typeof( String ).GetField( "m_stringLength", BindingFlags.NonPublic | BindingFlags.Instance );
+			
+			// Make sure we are running on a framework that has both methods -
+			// otherwise we play it safe and just use TrimEnd().
+			if( arrayField != null && lengthField != null ) {
+				supportsLengthSetting = true;
+			} else {
+				arrayField = null;
+				lengthField = null;
+			}
+		}
+		
+		public StringBuffer( int capacity ) {
+			this.capacity = capacity;
+			value = new String( '\0', capacity );
+		}
+		
+		public StringBuffer Append( int index, char c ) {
+			fixed( char* ptr = value ) {
+				ptr[index] = c;
+				return this;
+			}
+		}
+		
+		public StringBuffer Append( int index, string s ) {
+			fixed( char* ptr = value ) {
+				char* offsetPtr = ptr + index;
+				return Append( ref offsetPtr, s );
+			}
+		}
+		
+		public StringBuffer Append( ref char* ptr, string s ) {
+			for( int i = 0; i < s.Length; i++ ) {
+				*ptr++ = s[i];
+			}
+			return this;
+		}
+		
+		public StringBuffer Append( ref char* ptr, char c) {
+			*ptr++ = c;
+			return this;
+		}
+		
+		static char[] numBuffer = new char[20];
+		public StringBuffer AppendNum( ref char* ptr, long num ) {
+			int index = 0;
+			numBuffer[index++] = (char)( '0' + ( num % 10 ) );
+			num /= 10;
+			
+			while( num > 0 ) {
+				numBuffer[index++] = (char)( '0' + ( num % 10 ) );
+				num /= 10;
+			}
+			for( int i = index - 1; i >= 0; i-- ) {
+				*ptr++ = numBuffer[i];
+			}
+			return this;
+		}
+		
+		public StringBuffer Clear() {
+			fixed( char* ptr = value ) {
+				return Clear( ptr );
+			}
+		}
+		
+		public StringBuffer Clear( char* ptr ) {
+			for( int i = 0; i < capacity; i++ ) {
+				*ptr++ = '\0';
+			}
+			return this;
+		}
+		
+		public void DeleteAt( int index ) {
+			fixed( char* ptr = value ) {
+				char* offsetPtr = ptr + index;
+				for( int i = index; i < capacity - 1; i++ ) {
+					*offsetPtr = *( offsetPtr + 1 );
+					offsetPtr++;
+				}
+				*offsetPtr = '\0';
+			}
+		}
+		
+		public void InsertAt( int index, char c ) {
+			fixed( char* ptr = value ) {
+				char* offsetPtr = ptr + capacity - 1;
+				for( int i = capacity - 1; i > index; i-- ) {
+					*offsetPtr = *( offsetPtr - 1 );
+					offsetPtr--;
+				}
+				*offsetPtr = c;
+			}
+		}
+		
+		
+		public bool Empty {
+			get {
+				fixed( char* ptr = value ) {
+					for( int i = 0; i < capacity; i++ ) {
+						if( ptr[i] != '\0' )
+							return false;
+					}
+				}
+				return true;
+			}
+		}
+		
+		public int Length {
+			get {
+				int len = capacity;
+				fixed( char* ptr = value ) {
+					for( int i = capacity - 1; i >= 0; i-- ) {
+						if( ptr[i] != '\0' )
+							break;
+						len--;
+					}
+				}
+				return len;
+			}
+		}
+		
+		/// <summary> Hack that modifies the underlying string's length to avoid memory allocations. </summary>
+		/// <returns> The underlying string - ***do not*** store this because it is mutable!
+		/// You should only use this string for temporary measuring and drawing. </returns>
+		public string UpdateCachedString() {
+			return supportsLengthSetting ? value : value.TrimEnd( trimEnd );
+		}
+		static char[] trimEnd = { '\0' };
+		
+		public override string ToString() {
+			return GetCopy( Length );
+		}
+		
+		public string GetSubstring( int length ) {
+			return supportsLengthSetting ? SetLength( length ) : GetCopy( length );
+		}
+		
+		public void RestoreLength() {
+			if( supportsLengthSetting )
+				SetLength( Length );
+		}
+		
+		string SetLength( int len ) {
+			arrayField.SetValue( value, len + 1 );
+			lengthField.SetValue( value, len );
+			return value;
+		}
+		
+		string GetCopy( int len ) {
+			string copiedString = new String( '\0', len );
+			fixed( char* src = value, dst = copiedString ) {
+				for( int i = 0; i < len; i++ ) {
+					dst[i] = src[i];
+				}
+			}
+			return copiedString;
+		}	
+	}
+}

ClassicalSharp/Utils/UnsafeString.cs

@@ -1,122 +0,0 @@
-using System;
-
-namespace ClassicalSharp {
-	
-	// Class used to minimise memory allocations of strings. 
-	// Really, only useful for FpsScreen and TextInputWidget as they allocate lots of very small strings.
-	// Seriously, you should *not* use this anywhere else, as Empty and Length are O(N).
-	internal sealed unsafe class UnsafeString {
-		
-		internal string value;
-		internal int capacity;
-		
-		public UnsafeString( int capacity ) {
-			this.capacity = capacity;
-			value = new String( '\0', capacity );
-		}
-		
-		public UnsafeString Append( int index, char c ) {
-			fixed( char* ptr = value ) {
-				ptr[index] = c;
-				return this;
-			}
-		}
-		
-		public UnsafeString Append( int index, string s ) {
-			fixed( char* ptr = value ) {
-				char* offsetPtr = ptr + index;
-				return Append( ref offsetPtr, s );
-			}
-		}
-		
-		public UnsafeString Append( ref char* ptr, string s ) {
-			for( int i = 0; i < s.Length; i++ ) {
-				*ptr++ = s[i];
-			}
-			return this;
-		}
-		
-		public UnsafeString Append( ref char* ptr, char c) {
-			*ptr++ = c;
-			return this;
-		}
-		
-		static char[] numBuffer = new char[20];
-		public UnsafeString AppendNum( ref char* ptr, long num ) {
-			int index = 0;
-			numBuffer[index++] = (char)( '0' + ( num % 10 ) );
-			num /= 10;
-			
-			while( num > 0 ) {
-				numBuffer[index++] = (char)( '0' + ( num % 10 ) );
-				num /= 10;
-			}
-			for( int i = index - 1; i >= 0; i-- ) {
-				*ptr++ = numBuffer[i];
-			}
-			return this;
-		}
-		
-		public UnsafeString Clear() {
-			fixed( char* ptr = value ) {
-				return Clear( ptr );
-			}
-		}
-		
-		public UnsafeString Clear( char* ptr ) {
-			for( int i = 0; i < capacity; i++ ) {
-				*ptr++ = '\0';
-			}
-			return this;
-		}
-		
-		public void DeleteAt( int index ) {
-			fixed( char* ptr = value ) {
-				char* offsetPtr = ptr + index;
-				for( int i = index; i < capacity - 1; i++ ) {
-					*offsetPtr = *( offsetPtr + 1 );
-					offsetPtr++;
-				}
-				*offsetPtr = '\0';
-			}
-		}
-		
-		public void InsertAt( int index, char c ) {
-			fixed( char* ptr = value ) {
-				char* offsetPtr = ptr + capacity - 1;
-				for( int i = capacity - 1; i > index; i-- ) {
-					*offsetPtr = *( offsetPtr - 1 );
-					offsetPtr--;
-				}
-				*offsetPtr = c;
-			}
-		}
-		
-		
-		public bool Empty {
-			get {
-				for( int i = 0; i < capacity; i++ ) {
-					if( value[i] != '\0' ) 
-						return false;
-				}
-				return true;
-			}
-		}
-		
-		public int Length {
-			get {
-				int len = capacity;
-				for( int i = capacity - 1; i >= 0; i-- ) {
-					if( value[i] != '\0' ) 
-						break;
-					len--;
-				}
-				return len;
-			}
-		}
-		
-		public override string ToString() {
-			return value.TrimEnd( '\0' );
-		}
-	}
-}

OpenTK/SharpDX.Direct3D/Resources.cs

@@ -113,7 +113,7 @@ namespace SharpDX.Direct3D9 {
 			return lockedRect;
 		}
 		
-		public void SetData( int level, LockFlags flags, IntPtr data,int bytes  ) {
+		public void SetData( int level, LockFlags flags, IntPtr data, int bytes ) {
 			LockedRectangle rect = LockRectangle( level, flags );
 			MemUtils.memcpy( data, rect.DataPointer, bytes );
 			UnlockRectangle( level );