Use ByteArray's native for Socket and File.

runtime/lib/byte_array.dart

Index: runtime/lib/byte_array.dart
===================================================================
--- runtime/lib/byte_array.dart	(revision 3706)
+++ runtime/lib/byte_array.dart	(working copy)
@@ -96,7 +96,12 @@
   }
 
   void operator[]=(int index, int value) {
-    setUint8(index, value);
+    if (value is int && value >= 0 && value <= 255) {
+      setUint8(index, value);
+    } else {
+      throw const IllegalArgumentException(
+          "value is not an integer in byte range");

[Søren Gjesse, 2012/02/01 08:16:08]

"in byte range" -> "in the byte range"

Start message with uppercase.

[Anders Johnsen, 2012/02/01 18:54:53]

Done.

+    }
   }
 
   void set length(int newLength) {
@@ -141,9 +146,36 @@
     return this[length - 1];
   }
 
+  void setRange(int start, int length, List<int> from, [int startFrom = 0]) {
+    if (length < 0) {
+      throw new IllegalArgumentException("negative length $length");
+    }
+    if (from is ByteArray) {
+      _setRange(start, length, from, startFrom);
+    } else {
+      Arrays.copy(from, startFrom, this, start, length);
+    }
+  }
+  
+  List getRange(int start, int length) {
+    if (length == 0) return [];
+    Arrays.rangeCheck(this, start, length);
+    ByteArray list = new ByteArray(length);
+    list._setRange(0, length, this, start);
+    return list;
+  }
+
+
   // Implementation
 
   int _length() native "ByteArray_getLength";
+
+  void _setRange(int start,
+                 int length,
+                 ByteArray from,
+                 int startFrom)

[Søren Gjesse, 2012/02/01 08:16:08]

I think the parameter list can fit on a single line.

[Anders Johnsen, 2012/02/01 18:54:53]

Done.

+      native "ByteArray_setRange";
+
 }