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