Move MimeMultipartTransformer and HttpBodyHandler to mime and http_server packages.

sdk/lib/io/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 dart.io;
-
-
-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) {
-    _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.fromName(contentType.charset);
-      }
-      if (encoding == null) encoding = Encoding.ISO_8859_1;
-      _stream = _stream
-          .transform(new StringDecoder(encoding))
-          .expand((data) {
-            buffer.write(data);
-            var out = _HttpUtils.decodeHttpEntityString(buffer.toString());
-            if (out != null) {
-              buffer = new StringBuffer();
-              return [out];
-            }
-            return const [];
-          });
-    }
-  }
-
-  bool get isText => _isText;
-  bool get isBinary => !_isText;
-
-  static HttpMultipartFormData parse(MimeMultipart multipart) {
-    var type;
-    var encoding;
-    var disposition;
-    var remaining = new Map<String, String>();
-    for (String key in multipart.headers.keys) {
-      switch (key) {
-        case HttpHeaders.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);
-  }
-
-  StreamSubscription listen(void onData(data),
-                            {void onDone(),
-                             void onError(error),
-                             bool cancelOnError}) {
-    return _stream.listen(onData,
-                          onDone: onDone,
-                          onError: onError,
-                          cancelOnError: cancelOnError);
-  }
-
-  String value(String name) {
-    return _mimeMultipart.headers[name];
-  }
-}
-