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// Copyright 2015 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 STORAGE_BROWSER_BLOB_UPLOAD_BLOB_ELEMENT_READER_H_
#define STORAGE_BROWSER_BLOB_UPLOAD_BLOB_ELEMENT_READER_H_
#include <stdint.h>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "net/base/completion_callback.h"
#include "net/base/upload_element_reader.h"
#include "storage/browser/storage_browser_export.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace net {
class IOBuffer;
}
namespace storage {
class BlobDataHandle;
class BlobReader;
class FileSystemContext;
// This class is a wrapper around the BlobReader to make it conform
// to the net::UploadElementReader interface, and it also holds around the
// handle to the blob so it stays in memory while we read it.
class STORAGE_EXPORT UploadBlobElementReader
: NON_EXPORTED_BASE(public net::UploadElementReader) {
public:
UploadBlobElementReader(scoped_ptr<BlobDataHandle> handle,
FileSystemContext* file_system_context,
base::SingleThreadTaskRunner* file_task_runner);
~UploadBlobElementReader() override;
int Init(const net::CompletionCallback& callback) override;
uint64_t GetContentLength() const override;
uint64_t BytesRemaining() const override;
bool IsInMemory() const override;
int Read(net::IOBuffer* buf,
int buf_length,
const net::CompletionCallback& callback) override;
const std::string& uuid() const;
private:
scoped_ptr<BlobDataHandle> handle_;
scoped_refptr<FileSystemContext> file_system_context_;
scoped_refptr<base::SingleThreadTaskRunner> file_runner_;
scoped_ptr<BlobReader> reader_;
DISALLOW_COPY_AND_ASSIGN(UploadBlobElementReader);
};
} // namespace storage
#endif // STORAGE_BROWSER_BLOB_UPLOAD_BLOB_ELEMENT_READER_H_