Ensure that only byte values are sent by sockets and web sockets

sdk/lib/io/common.dart

Index: sdk/lib/io/common.dart
diff --git a/sdk/lib/io/common.dart b/sdk/lib/io/common.dart
index 31ce72b6c9232096c18104b1a907dc6bc4204972..5470cc23fa5945f05fb62f4beff4a8728ab35739 100644
--- a/sdk/lib/io/common.dart
+++ b/sdk/lib/io/common.dart
@@ -131,6 +131,28 @@ _BufferAndStart _ensureFastAndSerializableBuffer(
 }
 
 
+_BufferAndStart _ensureFastAndSerializableByteBuffer(

[Anders Johnsen, 2013/06/12 06:13:58]

It's not a byte buffer but a view we returns, but maybe name it
_ensureFastAndSerializableTypedData?

[Søren Gjesse, 2013/06/12 08:34:00]

Done (just Data instead of TypedData).

+    List buffer, int start, int end) {
+  if (buffer is Uint8List) {
+    return new _BufferAndStart(buffer, start);
+  }
+  int length = end - start;
+  var newBuffer = new Uint8List(length);
+  int j = start;
+  for (int i = 0; i < length; i++) {
+    int value = buffer[j];
+    if (value is! int ||
+        value < 0 || 255 < value) {
+      throw new ArgumentError(
+          "List element is not a byte value (value $value at index $j)");
+    }
+    newBuffer[i] = value;
+    j++;
+  }
+  return new _BufferAndStart(newBuffer, 0);
+}
+
+
 // TODO(ager): The only reason for the class here is that
 // we cannot patch a top-level function.
 class _BufferUtils {