Chromium Blob hacking

webkit/browser/blob/blob_storage_controller.h

-// 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.
-
-#ifndef WEBKIT_BROWSER_BLOB_BLOB_STORAGE_CONTROLLER_H_
-#define WEBKIT_BROWSER_BLOB_BLOB_STORAGE_CONTROLLER_H_
-
-#include <map>
-#include <string>
-
-#include "base/containers/hash_tables.h"
-#include "base/memory/ref_counted.h"
-#include "base/process/process.h"
-#include "webkit/browser/webkit_storage_browser_export.h"
-#include "webkit/common/blob/blob_data.h"
-
-class GURL;
-
-namespace base {
-class FilePath;
-class Time;
-}
-
-namespace webkit_blob {
-
-// This class handles the logistics of blob Storage within the browser process.
-class WEBKIT_STORAGE_BROWSER_EXPORT BlobStorageController {
- public:
-  BlobStorageController();
-  ~BlobStorageController();
-
-  void StartBuildingBlob(const GURL& url);
-  void AppendBlobDataItem(const GURL& url, const BlobData::Item& data_item);
-  void FinishBuildingBlob(const GURL& url, const std::string& content_type);
-  void AddFinishedBlob(const GURL& url, const BlobData* blob_data);
-  void CloneBlob(const GURL& url, const GURL& src_url);
-  void RemoveBlob(const GURL& url);
-  BlobData* GetBlobDataFromUrl(const GURL& url);
-
- private:
-  friend class ViewBlobInternalsJob;
-
-  typedef base::hash_map<std::string, scoped_refptr<BlobData> > BlobMap;
-  typedef std::map<BlobData*, int> BlobDataUsageMap;
-
-  void AppendStorageItems(BlobData* target_blob_data,
-                          BlobData* src_blob_data,
-                          uint64 offset,
-                          uint64 length);
-  void AppendFileItem(BlobData* target_blob_data,
-                      const base::FilePath& file_path, uint64 offset,
-                      uint64 length,
-                      const base::Time& expected_modification_time);
-  void AppendFileSystemFileItem(
-      BlobData* target_blob_data,
-      const GURL& url, uint64 offset, uint64 length,
-      const base::Time& expected_modification_time);
-
-  bool RemoveFromMapHelper(BlobMap* map, const GURL& url);
-
-  void IncrementBlobDataUsage(BlobData* blob_data);
-  // Returns true if no longer in use.
-  bool DecrementBlobDataUsage(BlobData* blob_data);
-
-  BlobMap blob_map_;
-  BlobMap unfinalized_blob_map_;
-
-  // Used to keep track of how much memory is being utitlized for blob data,
-  // we count only the items of TYPE_DATA which are held in memory and not
-  // items of TYPE_FILE.
-  int64 memory_usage_;
-
-  // Multiple urls can refer to the same blob data, this map keeps track of
-  // how many urls refer to a BlobData.
-  BlobDataUsageMap blob_data_usage_count_;
-
-  DISALLOW_COPY_AND_ASSIGN(BlobStorageController);
-};
-
-}  // namespace webkit_blob
-
-#endif  // WEBKIT_BROWSER_BLOB_BLOB_STORAGE_CONTROLLER_H_