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// Copyright 2016 The Cobalt Authors. 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 successfully 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_