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// Copyright (c) 2012 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.
#ifndef CONTENT_BROWSER_RENDERER_HOST_BUFFERED_RESOURCE_HANDLER_H_
#define CONTENT_BROWSER_RENDERER_HOST_BUFFERED_RESOURCE_HANDLER_H_
#pragma once
#include <string>
#include "content/browser/renderer_host/layered_resource_handler.h"
class ResourceDispatcherHost;
namespace net {
class URLRequest;
} // namespace net
namespace webkit {
struct WebPluginInfo;
}
namespace content {
// Used to buffer a request until enough data has been received.
class BufferedResourceHandler : public LayeredResourceHandler {
public:
BufferedResourceHandler(ResourceHandler* handler,
ResourceDispatcherHost* host,
net::URLRequest* request);
// ResourceHandler implementation:
virtual bool OnResponseStarted(int request_id,
ResourceResponse* response) OVERRIDE;
virtual bool OnWillRead(int request_id,
net::IOBuffer** buf,
int* buf_size,
int min_size) OVERRIDE;
virtual bool OnReadCompleted(int request_id, int* bytes_read) OVERRIDE;
virtual void OnRequestClosed() OVERRIDE;
private:
virtual ~BufferedResourceHandler();
// Returns true if we should delay OnResponseStarted forwarding.
bool DelayResponse();
// Returns true if there is enough information to process the DocType.
bool DidBufferEnough(int bytes_read);
// Returns true if we have to keep buffering data.
bool KeepBuffering(int bytes_read);
// Sends a pending OnResponseStarted notification.
bool CompleteResponseStarted(int request_id);
// Returns true if we have to wait until the plugin list is generated.
bool ShouldWaitForPlugins();
// A test to determining whether the request should be forwarded to the
// download thread. If need_plugin_list was passed in and was set to true,
// that means that the check couldn't be fully done because the plugins aren't
// loaded. The function should be called again after the plugin list is
// loaded.
bool ShouldDownload(bool* need_plugin_list);
// Informs the original ResourceHandler |next_handler_| that the response
// will be handled entirely by the new ResourceHandler |handler|. A
// reference to |handler| is acquired. Returns false to indicate an error,
// which will result in the request being cancelled.
bool UseAlternateResourceHandler(int request_id, ResourceHandler* handler);
// Forwards any queued events to |next_handler_|. Returns false to indicate
// an error, which will result in the request being cancelled.
bool ForwardPendingEventsToNextHandler(int request_id);
// Copies data from |read_buffer_| to |next_handler_|.
void CopyReadBufferToNextHandler(int request_id);
// Called on the IO thread once the list of plugins has been loaded.
void OnPluginsLoaded(const std::vector<webkit::WebPluginInfo>& plugins);
scoped_refptr<ResourceResponse> response_;
ResourceDispatcherHost* host_;
net::URLRequest* request_;
scoped_refptr<net::IOBuffer> read_buffer_;
scoped_refptr<net::IOBuffer> my_buffer_;
int read_buffer_size_;
int bytes_read_;
bool sniff_content_;
bool wait_for_plugins_;
bool buffering_;
bool next_handler_needs_response_started_;
bool next_handler_needs_will_read_;
bool finished_;
DISALLOW_COPY_AND_ASSIGN(BufferedResourceHandler);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_BUFFERED_RESOURCE_HANDLER_H_
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