Stream.h

/*
 * (C) Copyright 2020 ECMWF.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 * In applying this licence, ECMWF does not waive the privileges and immunities
 * granted to it by virtue of its status as an intergovernmental organisation
 * nor does it submit to any jurisdiction.
 */

#pragma once

#include <cstdint>
#include <memory>

namespace eckit {
class DataHandle;
}

namespace atlas {
namespace io {

//---------------------------------------------------------------------------------------------------------------------

class Stream {
public:
    Stream() = default;

    Stream( eckit::DataHandle* );

    Stream( std::shared_ptr<eckit::DataHandle> );

    Stream( eckit::DataHandle& );

    Stream( const Stream& );

    eckit::DataHandle& datahandle();

    std::uint64_t seek( std::uint64_t offset );

    std::uint64_t position();

    std::uint64_t write( const void* data, size_t length );

    std::uint64_t read( void* data, size_t length );

    operator bool() const { return ptr_; }

private:
    std::shared_ptr<eckit::DataHandle> shared_;
    eckit::DataHandle* ptr_{nullptr};
};

//---------------------------------------------------------------------------------------------------------------------

}  // namespace io
}  // namespace atlas