| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef EXTENSIONS_BROWSER_BLOB_READER_H_ |
| #define EXTENSIONS_BROWSER_BLOB_READER_H_ |
| |
| #include <stdint.h> |
| |
| #include <memory> |
| #include <string> |
| |
| #include "base/callback.h" |
| #include "base/macros.h" |
| #include "net/base/io_buffer.h" |
| #include "net/url_request/url_fetcher_delegate.h" |
| #include "net/url_request/url_request.h" |
| #include "url/gurl.h" |
| |
| namespace content { |
| class BrowserContext; |
| } |
| |
| namespace net { |
| class URLFetcher; |
| } |
| |
| // This class may only be used from the UI thread. |
| class BlobReader : public net::URLFetcherDelegate { |
| public: |
| // |blob_data| contains the portion of the Blob requested. |blob_total_size| |
| // is the total size of the Blob, and may be larger than |blob_data->size()|. |
| // |blob_total_size| is -1 if it cannot be determined. |
| typedef base::Callback<void(std::unique_ptr<std::string> blob_data, |
| int64_t blob_total_size)> |
| BlobReadCallback; |
| |
| BlobReader(content::BrowserContext* browser_context, |
| const std::string& blob_uuid, |
| BlobReadCallback callback); |
| ~BlobReader() override; |
| |
| void SetByteRange(int64_t offset, int64_t length); |
| |
| void Start(); |
| |
| private: |
| // Overridden from net::URLFetcherDelegate. |
| void OnURLFetchComplete(const net::URLFetcher* source) override; |
| |
| BlobReadCallback callback_; |
| std::unique_ptr<net::URLFetcher> fetcher_; |
| |
| DISALLOW_COPY_AND_ASSIGN(BlobReader); |
| }; |
| |
| #endif // EXTENSIONS_BROWSER_BLOB_READER_H_ |