net/url_request/url_request_file_job.h

   1 // Copyright (c) 2012 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 NET_URL_REQUEST_URL_REQUEST_FILE_JOB_H_
   6 #define NET_URL_REQUEST_URL_REQUEST_FILE_JOB_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/files/file_path.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/memory/weak_ptr.h"
  14 #include "net/base/net_export.h"
  15 #include "net/http/http_byte_range.h"
  16 #include "net/url_request/url_request.h"
  17 #include "net/url_request/url_request_job.h"
  18
  19 namespace base {
  20 class TaskRunner;
  21 }
  22 namespace file_util {
  23 struct FileInfo;
  24 }
  25
  26 namespace net {
  27
  28 class FileStream;
  29
  30 // A request job that handles reading file URLs
  31 class NET_EXPORT URLRequestFileJob : public URLRequestJob {
  32  public:
  33   URLRequestFileJob(URLRequest* request,
  34                     NetworkDelegate* network_delegate,
  35                     const base::FilePath& file_path,
  36                     const scoped_refptr<base::TaskRunner>& file_task_runner);
  37
  38   // URLRequestJob:
  39   void Start() override;
  40   void Kill() override;
  41   bool ReadRawData(IOBuffer* buf, int buf_size, int* bytes_read) override;
  42   bool IsRedirectResponse(GURL* location, int* http_status_code) override;
  43   Filter* SetupFilter() const override;
  44   bool GetMimeType(std::string* mime_type) const override;
  45   void SetExtraRequestHeaders(const HttpRequestHeaders& headers) override;
  46
  47   // An interface for subclasses who wish to monitor read operations.
  48   virtual void OnSeekComplete(int64 result);
  49   virtual void OnReadComplete(IOBuffer* buf, int result);
  50
  51  protected:
  52   ~URLRequestFileJob() override;
  53
  54   int64 remaining_bytes() const { return remaining_bytes_; }
  55
  56   // The OS-specific full path name of the file
  57   base::FilePath file_path_;
  58
  59  private:
  60   // Meta information about the file. It's used as a member in the
  61   // URLRequestFileJob and also passed between threads because disk access is
  62   // necessary to obtain it.
  63   struct FileMetaInfo {
  64     FileMetaInfo();
  65
  66     // Size of the file.
  67     int64 file_size;
  68     // Mime type associated with the file.
  69     std::string mime_type;
  70     // Result returned from GetMimeTypeFromFile(), i.e. flag showing whether
  71     // obtaining of the mime type was successful.
  72     bool mime_type_result;
  73     // Flag showing whether the file exists.
  74     bool file_exists;
  75     // Flag showing whether the file name actually refers to a directory.
  76     bool is_directory;
  77   };
  78
  79   // Fetches file info on a background thread.
  80   static void FetchMetaInfo(const base::FilePath& file_path,
  81                             FileMetaInfo* meta_info);
  82
  83   // Callback after fetching file info on a background thread.
  84   void DidFetchMetaInfo(const FileMetaInfo* meta_info);
  85
  86   // Callback after opening file on a background thread.
  87   void DidOpen(int result);
  88
  89   // Callback after seeking to the beginning of |byte_range_| in the file
  90   // on a background thread.
  91   void DidSeek(int64 result);
  92
  93   // Callback after data is asynchronously read from the file into |buf|.
  94   void DidRead(scoped_refptr<IOBuffer> buf, int result);
  95
  96   scoped_ptr<FileStream> stream_;
  97   FileMetaInfo meta_info_;
  98   const scoped_refptr<base::TaskRunner> file_task_runner_;
  99
 100   HttpByteRange byte_range_;
 101   int64 remaining_bytes_;
 102
 103   base::WeakPtrFactory<URLRequestFileJob> weak_ptr_factory_;
 104
 105   DISALLOW_COPY_AND_ASSIGN(URLRequestFileJob);
 106 };
 107
 108 }  // namespace net
 109
 110 #endif  // NET_URL_REQUEST_URL_REQUEST_FILE_JOB_H_