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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// A delegate class of WebURLLoaderImpl that handles multipart/x-mixed-replace
+// data.  We special case multipart/x-mixed-replace because WebCore expects a
+// separate didReceiveResponse for each new message part.
+//
+// Most of the logic and edge case handling are based on the Mozilla's
+// implementation in netwerk/streamconv/converters/nsMultiMixedConv.cpp.
+// This seems like a derivative work, so here's the original license:
+
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef WEBKIT_CHILD_MULTIPART_RESPONSE_DELEGATE_H_
+#define WEBKIT_CHILD_MULTIPART_RESPONSE_DELEGATE_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "third_party/WebKit/public/platform/WebURLResponse.h"
+#include "webkit/child/webkit_child_export.h"
+
+namespace WebKit {
+class WebURLLoader;
+class WebURLLoaderClient;
+}
+
+namespace webkit_glue {
+
+// Used by unit tests to access private members.
+class MultipartResponseDelegateTester;
+
+class WEBKIT_CHILD_EXPORT MultipartResponseDelegate {
+ public:
+  MultipartResponseDelegate(WebKit::WebURLLoaderClient* client,
+                            WebKit::WebURLLoader* loader,
+                            const WebKit::WebURLResponse& response,
+                            const std::string& boundary);
+
+  // Passed through from ResourceHandleInternal
+  void OnReceivedData(const char* data, int data_len, int encoded_data_length);
+  void OnCompletedRequest();
+
+  // The request has been canceled, so stop making calls to the client.
+  void Cancel() {
+    client_ = NULL;
+    loader_ = NULL;
+  }
+
+  // Returns the multi part boundary string from the Content-type header
+  // in the response.
+  // Returns true on success.
+  static bool ReadMultipartBoundary(const WebKit::WebURLResponse& response,
+                                    std::string* multipart_boundary);
+
+  // Returns the lower and higher content ranges from an individual multipart
+  // in a multipart response.
+  // Returns true on success.
+  static bool ReadContentRanges(
+      const WebKit::WebURLResponse& response,
+      int64* content_range_lower_bound,
+      int64* content_range_upper_bound,
+      int64* content_range_instance_size);
+
+ private:
+  friend class MultipartResponseDelegateTester;  // For unittests.
+
+  // Pointers to the client and associated loader so we can make callbacks as
+  // we parse pieces of data.
+  WebKit::WebURLLoaderClient* client_;
+  WebKit::WebURLLoader* loader_;
+
+  // The original resource response for this request.  We use this as a
+  // starting point for each parts response.
+  WebKit::WebURLResponse original_response_;
+
+  // Checks to see if data[pos] character is a line break; handles crlf, lflf,
+  // lf, or cr. Returns the number of characters to skip over (0, 1 or 2).
+  int PushOverLine(const std::string& data, size_t pos);
+
+  // Tries to parse http headers from the start of data_.  Returns true if it
+  // succeeds and sends a didReceiveResponse to m_client.  Returns false if
+  // the header is incomplete (in which case we just wait for more data).
+  bool ParseHeaders();
+
+  // Find the next boundary in data_.  Returns std::string::npos if there's no
+  // full token.
+  size_t FindBoundary();
+
+  // Transferred data size accumulated between client callbacks.
+  int encoded_data_length_;
+
+  // A temporary buffer to hold data between reads for multipart data that
+  // gets split in the middle of a header.
+  std::string data_;
+
+  // Multipart boundary token
+  std::string boundary_;
+
+  // true until we get our first on received data call
+  bool first_received_data_;
+
+  // true if we're truncated in the middle of a header
+  bool processing_headers_;
+
+  // true when we're done sending information.  At that point, we stop
+  // processing AddData requests.
+  bool stop_sending_;
+
+  // true after we've sent our first response to the WebURLLoaderClient.
+  bool has_sent_first_response_;
+
+  DISALLOW_COPY_AND_ASSIGN(MultipartResponseDelegate);
+};
+
+}  // namespace webkit_glue
+
+#endif  // WEBKIT_CHILD_MULTIPART_RESPONSE_DELEGATE_H_