2006-03-09 Zoltan Varga <vargaz@gmail.com>

[mono.git] / mcs / class / corlib / System.Text / DecoderReplacementFallbackBuffer.cs

diff --git a/mcs/class/corlib/System.Text/DecoderReplacementFallbackBuffer.cs b/mcs/class/corlib/System.Text/DecoderReplacementFallbackBuffer.cs
index 533b722815c5b614e2599c177a347c3234b2b624..6a28d41493dc3cf24b81bdf20b944ceef32e72cf 100644 (file)
--- a/mcs/class/corlib/System.Text/DecoderReplacementFallbackBuffer.cs
+++ b/mcs/class/corlib/System.Text/DecoderReplacementFallbackBuffer.cs
@@ -28,42 +28,66 @@
 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 //
 
-#if NET_2_0
+#if NET_2_0 || NET_2_0_BOOTSTRAP
 
 namespace System.Text
 {
+       // This DecoderFallbackBuffer is simple. It ignores the input buffers.
+       // DecoderFallbackBuffer users could implement their own complex 
+       // fallback buffers.
+
        public sealed class DecoderReplacementFallbackBuffer
                : DecoderFallbackBuffer
        {
-               DecoderReplacementFallback fallback;
+               bool fallback_assigned;
+               int current;
+               string replacement;
 
                public DecoderReplacementFallbackBuffer (
                        DecoderReplacementFallback fallback)
                {
-                       this.fallback = fallback;
+                       if (fallback == null)
+                               throw new ArgumentNullException ("fallback");
+                       replacement = fallback.DefaultString;
+                       current = 0;
                }
 
-               [MonoTODO]
                public override int Remaining {
-                       get { throw new NotImplementedException (); }
+                       get { return replacement.Length - current; }
                }
 
-               [MonoTODO]
                public override bool Fallback (byte [] bytesUnknown, int index)
                {
-                       throw new NotImplementedException ();
+                       if (bytesUnknown == null)
+                               throw new ArgumentNullException ("bytesUnknown");
+                       if (fallback_assigned && Remaining != 0)
+                               throw new ArgumentException ("Reentrant Fallback method invocation occured. It might be because either this FallbackBuffer is incorrectly shared by multiple threads, invoked inside Encoding recursively, or Reset invocation is forgotten.");
+                       if (index < 0 || bytesUnknown.Length < index)
+                               throw new ArgumentOutOfRangeException ("index");
+                       fallback_assigned = true;
+                       current = 0;
+
+                       return replacement.Length > 0;
                }
 
-               [MonoTODO]
                public override char GetNextChar ()
                {
-                       throw new NotImplementedException ();
+                       if (current >= replacement.Length)
+                               return char.MinValue;
+                       return replacement [current++];
                }
 
-               [MonoTODO]
                public override bool MovePrevious ()
                {
-                       throw new NotImplementedException ();
+                       if (current == 0)
+                               return false;
+                       current--;
+                       return true;
+               }
+
+               public override void Reset ()
+               {
+                       current = 0;
                }
        }
 }