1// Copyright 2013 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_EXTENSIONS_BLOB_READER_H_
6#define CHROME_BROWSER_EXTENSIONS_BLOB_READER_H_
7
8#include <string>
9
10#include "base/callback.h"
11#include "base/memory/scoped_ptr.h"
12#include "net/base/io_buffer.h"
13#include "net/url_request/url_fetcher_delegate.h"
14#include "net/url_request/url_request.h"
15#include "url/gurl.h"
16
17class Profile;
18namespace net {
19class URLFetcher;
20}
21
22// This class may only be used from the UI thread.
23class BlobReader : public net::URLFetcherDelegate {
24 public:
25  // |blob_data| contains the portion of the Blob requested. |blob_total_size|
26  // is the total size of the Blob, and may be larger than |blob_data->size()|.
27  // |blob_total_size| is -1 if it cannot be determined.
28  typedef base::Callback<void(scoped_ptr<std::string> blob_data,
29                              int64 blob_total_size)>
30      BlobReadCallback;
31
32  BlobReader(Profile* profile,
33             const std::string& blob_uuid,
34             BlobReadCallback callback);
35  virtual ~BlobReader();
36
37  void SetByteRange(int64 offset, int64 length);
38
39  void Start();
40
41 private:
42  // Overridden from net::URLFetcherDelegate.
43  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
44
45  BlobReadCallback callback_;
46  scoped_ptr<net::URLFetcher> fetcher_;
47
48  DISALLOW_COPY_AND_ASSIGN(BlobReader);
49};
50
51#endif  // CHROME_BROWSER_EXTENSIONS_BLOB_READER_H_
52