New attempt at landing the resource_dispatcher_host.cc splitting (broke the build on Friday).

TBR=darin
Review URL: http://codereview.chromium.org/15801

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@7400 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 75 insertions, 0 deletions

diff --git a/chrome/browser/renderer_host/download_resource_handler.h b/chrome/browser/renderer_host/download_resource_handler.h
new file mode 100644
index 0000000..52f6c94
--- /dev/null
+++ b/chrome/browser/renderer_host/download_resource_handler.h
@@ -0,0 +1,75 @@
+// Copyright (c) 2006-2008 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 CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_
+#define CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_
+
+#include <string>
+
+#include "chrome/browser/renderer_host/resource_dispatcher_host.h"
+#include "chrome/browser/renderer_host/resource_handler.h"
+
+struct DownloadBuffer;
+
+// Forwards data to the download thread.
+class DownloadResourceHandler : public ResourceHandler {
+ public:
+  DownloadResourceHandler(ResourceDispatcherHost* rdh,
+                          int render_process_host_id,
+                          int render_view_id,
+                          int request_id,
+                          const std::string& url,
+                          DownloadFileManager* manager,
+                          URLRequest* request,
+                          bool save_as);
+
+  // Not needed, as this event handler ought to be the final resource.
+  bool OnRequestRedirected(int request_id, const GURL& url);
+
+  // Send the download creation information to the download thread.
+  bool OnResponseStarted(int request_id, ResourceResponse* response);
+
+  // Create a new buffer, which will be handed to the download thread for file
+  // writing and deletion.
+  bool OnWillRead(int request_id, char** buf, int* buf_size, int min_size);
+
+  bool OnReadCompleted(int request_id, int* bytes_read);
+
+  bool OnResponseCompleted(int request_id, const URLRequestStatus& status);
+
+  // If the content-length header is not present (or contains something other
+  // than numbers), the incoming content_length is -1 (unknown size).
+  // Set the content length to 0 to indicate unknown size to DownloadManager.
+  void set_content_length(const int64& content_length);
+
+  void set_content_disposition(const std::string& content_disposition);
+
+  void CheckWriteProgress();
+
+ private:
+  void StartPauseTimer();
+
+  int download_id_;
+  ResourceDispatcherHost::GlobalRequestID global_id_;
+  int render_view_id_;
+  char* read_buffer_;
+  std::string content_disposition_;
+  std::wstring url_;
+  int64 content_length_;
+  DownloadFileManager* download_manager_;
+  URLRequest* request_;
+  bool save_as_;  // Request was initiated via "Save As" by the user.
+  DownloadBuffer* buffer_;
+  ResourceDispatcherHost* rdh_;
+  bool is_paused_;
+  base::OneShotTimer<DownloadResourceHandler> pause_timer_;
+
+  static const int kReadBufSize = 32768;  // bytes
+  static const int kLoadsToWrite = 100;  // number of data buffers queued
+  static const int kThrottleTimeMs = 200;  // milliseconds
+
+  DISALLOW_COPY_AND_ASSIGN(DownloadResourceHandler);
+};
+
+#endif  // CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_