Expand usage of defaultEncoding in HttpBody in the http_server package.

pkg/http_server/lib/src/http_multipart_form_data_impl.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 http_server;
 
 
 class _HttpMultipartFormData extends Stream implements HttpMultipartFormData {
   final ContentType contentType;
   final HeaderValue contentDisposition;
   final HeaderValue contentTransferEncoding;
 
   final MimeMultipart _mimeMultipart;
 
   bool _isText = false;
 
   Stream _stream;
 
   _HttpMultipartFormData(ContentType this.contentType,
                          HeaderValue this.contentDisposition,
                          HeaderValue this.contentTransferEncoding,
-                         MimeMultipart this._mimeMultipart) {
+                         MimeMultipart this._mimeMultipart,
+                         Encoding defaultEncoding) {
     _stream = _mimeMultipart;
     if (contentTransferEncoding != null) {
       // TODO(ajohnsen): Support BASE64, etc.
       throw new HttpException("Unsupported contentTransferEncoding: "
                               "${contentTransferEncoding.value}");
     }
 
     if (contentType == null ||
         contentType.primaryType == 'text' ||
         contentType.mimeType == 'application/json') {
       _isText = true;
       StringBuffer buffer = new StringBuffer();
       Encoding encoding;
       if (contentType != null) {
         encoding = Encoding.getByName(contentType.charset);
       }
-      if (encoding == null) encoding = LATIN1;
+      if (encoding == null) encoding = defaultEncoding;
       _stream = _stream
           .transform(encoding.decoder)
           .expand((data) {
             buffer.write(data);
             var out = _decodeHttpEntityString(buffer.toString());
             if (out != null) {
               buffer.clear();
               return [out];
             }
             return const [];
           });
     }
   }
 
   bool get isText => _isText;
   bool get isBinary => !_isText;
 
-  static HttpMultipartFormData parse(MimeMultipart multipart) {
+  static HttpMultipartFormData parse(MimeMultipart multipart,
+                                     Encoding defaultEncoding) {
     var type;
     var encoding;
     var disposition;
     var remaining = new Map<String, String>();
     for (String key in multipart.headers.keys) {
       switch (key) {
         case 'content-type':
           type = ContentType.parse(multipart.headers[key]);
           break;
 
         case 'content-transfer-encoding':
           encoding = HeaderValue.parse(multipart.headers[key]);
           break;
 
         case 'content-disposition':
           disposition = HeaderValue.parse(multipart.headers[key]);
           break;
 
         default:
           remaining[key] = multipart.headers[key];
           break;
       }
     }
     if (disposition == null) {
       throw new HttpException(
           "Mime Multipart doesn't contain a Content-Disposition header value");
     }
-    return new _HttpMultipartFormData(type, disposition, encoding, multipart);
+    return new _HttpMultipartFormData(
+        type, disposition, encoding, multipart, defaultEncoding);
   }
 
   StreamSubscription listen(void onData(data),
                             {void onDone(),
                              void onError(error),
                              bool cancelOnError}) {
     return _stream.listen(onData,
                           onDone: onDone,
                           onError: onError,
                           cancelOnError: cancelOnError);
@@ skipping 33 matching lines @@
     while ((amp = input.indexOf('&', offset)) >= 0) {
       buffer.write(input.substring(offset, amp));
       int end = input.indexOf(';', amp);
       parse(amp, end);
       offset = end + 1;
     }
     buffer.write(input.substring(offset));
     return buffer.toString();
   }
 }