Move MimeMultipartTransformer and HttpBodyHandler to mime and http_server packages.

pkg/mime/lib/src/mime_multipart_transformer.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-part of dart.io;
+part of mime;
 
 
 /**
  * A Mime Multipart class representing each part parsed by
  * [MimeMultipartTransformer]. The data is streamed in as it become available.
  */
 abstract class MimeMultipart extends Stream<List<int>> {
   Map<String, String> get headers;
 }
 
 class _MimeMultipart extends MimeMultipart {
   final Map<String, String> headers;
   final Stream<List<int>> _stream;
 
   _MimeMultipart(this.headers, this._stream);
 
   StreamSubscription<List<int>> listen(void onData(List<int> data),
                                        {void onDone(),
                                         void onError(error),
                                         bool cancelOnError}) {
     return _stream.listen(onData,
                           onDone: onDone,
                           onError: onError,
                           cancelOnError: cancelOnError);
   }
 }
 
+class _Const {
+  // Bytes for '()<>@,;:\\"/[]?={} \t'.
+  static const SEPARATORS = const [40, 41, 60, 62, 64, 44, 59, 58, 92, 34, 47,
+                                   91, 93, 63, 61, 123, 125, 32, 9];
+}
+
+class _CharCode {
+  static const int HT = 9;
+  static const int LF = 10;
+  static const int CR = 13;
+  static const int SP = 32;
+  static const int DASH = 45;
+  static const int COLON = 58;
+}
+
 /**
  * Parser for MIME multipart types of data as described in RFC 2046
  * section 5.1.1. The data is transformed into [MimeMultipart] objects, each
  * of them streaming the multipart data.
  */
 class MimeMultipartTransformer
     implements StreamTransformer<List<int>, MimeMultipart> {
   static const int _START = 0;
   static const int _FIRST_BOUNDARY_ENDING = 111;
   static const int _FIRST_BOUNDARY_END = 112;
@@ skipping 348 matching lines @@
   }
 
   void _expectWS(int byte) {
     if (byte != _CharCode.SP && byte != _CharCode.HT) {
       throw new MimeMultipartException("Failed to parse multipart mime 2");
     }
   }
 }
 
 
-class MimeMultipartException implements IOException {
+class MimeMultipartException implements Exception {
   const MimeMultipartException([String this.message = ""]);
   String toString() => "MimeMultipartException: $message";
   final String message;
 }