chrome/browser/chromeos/file_system_provider/operations/read_file.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 CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_READ_FILE_H_
   6 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_READ_FILE_H_
   7
   8 #include "base/files/file.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "chrome/browser/chromeos/file_system_provider/operations/operation.h"
  12 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
  13 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
  14 #include "chrome/browser/chromeos/file_system_provider/request_value.h"
  15 #include "net/base/io_buffer.h"
  16 #include "storage/browser/fileapi/async_file_util.h"
  17
  18 namespace base {
  19 class FilePath;
  20 }  // namespace base
  21
  22 namespace extensions {
  23 class EventRouter;
  24 }  // namespace extensions
  25
  26 namespace chromeos {
  27 namespace file_system_provider {
  28 namespace operations {
  29
  30 // Bridge between fileapi read file and providing extension's read fil request.
  31 // Created per request.
  32 class ReadFile : public Operation {
  33  public:
  34   ReadFile(
  35       extensions::EventRouter* event_router,
  36       const ProvidedFileSystemInfo& file_system_info,
  37       int file_handle,
  38       scoped_refptr<net::IOBuffer> buffer,
  39       int64 offset,
  40       int length,
  41       const ProvidedFileSystemInterface::ReadChunkReceivedCallback& callback);
  42   ~ReadFile() override;
  43
  44   // Operation overrides.
  45   bool Execute(int request_id) override;
  46   void OnSuccess(int request_id,
  47                  scoped_ptr<RequestValue> result,
  48                  bool has_more) override;
  49   void OnError(int request_id,
  50                scoped_ptr<RequestValue> result,
  51                base::File::Error error) override;
  52
  53  private:
  54   int file_handle_;
  55   scoped_refptr<net::IOBuffer> buffer_;
  56   int64 offset_;
  57   int length_;
  58   int64 current_offset_;
  59   const ProvidedFileSystemInterface::ReadChunkReceivedCallback callback_;
  60
  61   DISALLOW_COPY_AND_ASSIGN(ReadFile);
  62 };
  63
  64 }  // namespace operations
  65 }  // namespace file_system_provider
  66 }  // namespace chromeos
  67
  68 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_READ_FILE_H_