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 17 class Profile; 18 namespace net { 19 class URLFetcher; 20 } 21 22 // This class may only be used from the UI thread. 23 class 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