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// Copyright 2014 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
* 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 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 ***** */
#include <string>
#include "base/basictypes.h"
#include "content/common/content_export.h"
#include "third_party/WebKit/public/platform/WebURLResponse.h"
namespace blink {
class WebURLLoader;
class WebURLLoaderClient;
namespace content {
class CONTENT_EXPORT MultipartResponseDelegate {
MultipartResponseDelegate(blink::WebURLLoaderClient* client,
blink::WebURLLoader* loader,
const blink::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 blink::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 blink::WebURLResponse& response,
int64* content_range_lower_bound,
int64* content_range_upper_bound,
int64* content_range_instance_size);
friend class MultipartResponseDelegateTester; // For unittests.
// Pointers to the client and associated loader so we can make callbacks as
// we parse pieces of data.
blink::WebURLLoaderClient* client_;
blink::WebURLLoader* loader_;
// The original resource response for this request. We use this as a
// starting point for each parts response.
blink::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_;
} // namespace content