| /* |
| * Copyright 2016 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef COBALT_LOADER_BLOB_FETCHER_H_ |
| #define COBALT_LOADER_BLOB_FETCHER_H_ |
| |
| #include "base/memory/weak_ptr.h" |
| #include "cobalt/loader/fetcher.h" |
| |
| namespace cobalt { |
| namespace loader { |
| |
| // For fetching the 'blob:' scheme. |
| class BlobFetcher : public Fetcher { |
| public: |
| // This callback avoids a dependency from the fetcher to the actual blob |
| // implementation. |
| // If the blob is succesfully fetched: |
| // 1. Writes the size of its buffer to |size|. |
| // 2. If |size| > 0, then it also writes the address of the non-empty buffer |
| // to |data|, otherwise writes NULL to |data|. |
| // 3. Returns true. |
| // If the fetch fails: |
| // 1. Writes 0 to |size| |
| // 2. Writes NULL to |data| |
| // 3. Returns false. |
| typedef base::Callback<bool(const GURL& url, const char** data, size_t* size)> |
| ResolverCallback; |
| |
| explicit BlobFetcher(const GURL& url, Handler* handler, |
| const ResolverCallback& resolver_callback); |
| |
| void Fetch(); |
| |
| ~BlobFetcher() OVERRIDE; |
| |
| private: |
| void GetData(); |
| |
| GURL url_; |
| ResolverCallback resolver_callback_; |
| base::WeakPtrFactory<BlobFetcher> weak_ptr_factory_; |
| }; |
| |
| } // namespace loader |
| } // namespace cobalt |
| |
| #endif // COBALT_LOADER_BLOB_FETCHER_H_ |