components/translate/content/renderer/data_file_renderer_cld_data_provider.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_TRANSLATE_CONTENT_RENDERER_DATA_FILE_RENDERER_CLD_DATA_PROVIDER_H_
   6 #define COMPONENTS_TRANSLATE_CONTENT_RENDERER_DATA_FILE_RENDERER_CLD_DATA_PROVIDER_H_
   7
   8 #include "base/files/file.h"
   9 #include "base/macros.h"
  10 #include "components/translate/content/renderer/renderer_cld_data_provider.h"
  11 #include "ipc/ipc_platform_file.h"
  12
  13 namespace content {
  14 class RenderViewObserver;
  15 }
  16
  17 namespace translate {
  18
  19 class DataFileRendererCldDataProvider : public RendererCldDataProvider {
  20  public:
  21   explicit DataFileRendererCldDataProvider(content::RenderViewObserver*);
  22   ~DataFileRendererCldDataProvider() override;
  23
  24   // Load the CLD data from the specified file, starting at the specified byte
  25   // offset and having the specified length (also in bytes). Nominally, the
  26   // implementation will mmap the file in read-only mode and hand the data off
  27   // to CLD2::loadDataFromRawAddress(...). See the module
  28   // third_party/cld_2/src/internal/compact_lang_det.h for more information on
  29   // the dynamic data loading process.
  30   void LoadCldData(base::File file,
  31                    const uint64 data_offset,
  32                    const uint64 data_length);
  33
  34   // RendererCldDataProvider implementations:
  35   bool OnMessageReceived(const IPC::Message&) override;
  36   void SendCldDataRequest() override;
  37   void SetCldAvailableCallback(base::Callback<void(void)>) override;
  38   bool IsCldDataAvailable() override;
  39
  40  private:
  41   void OnCldDataAvailable(const IPC::PlatformFileForTransit ipc_file_handle,
  42                           const uint64 data_offset,
  43                           const uint64 data_length);
  44   content::RenderViewObserver* render_view_observer_;
  45   base::Callback<void(void)> cld_available_callback_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(DataFileRendererCldDataProvider);
  48 };
  49
  50 }  // namespace translate
  51
  52 #endif  // COMPONENTS_TRANSLATE_CONTENT_RENDERER_DATA_FILE_RENDERER_CLD_DATA_PROVIDER_H_