TLS: Add _pendingBytes()

lib/tls.js

@@ -290,6 +290,11 @@ function CleartextStream(pair) {
 util.inherits(CleartextStream, CryptoStream);
 
 
+CleartextStream.prototype._pendingBytes = function() {
+  return this.pair._ssl._clearPending();
+};
+
+
 CleartextStream.prototype._sucker = function(b) {
   debug('writng from clearIn');
   return this.pair._ssl.clearIn(b, 0, b.length);
@@ -309,6 +314,11 @@ function EncryptedStream(pair) {
 util.inherits(EncryptedStream, CryptoStream);
 
 
+EncryptedStream.prototype._pendingBytes = function() {
+  return this.pair._ssl._endPending();
+};
+
+
 EncryptedStream.prototype._sucker = function(b) {
   debug('writing from encIn');
   return this.pair._ssl.encIn(b, 0, b.length);