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/*
This file is part of Android File Transfer For Linux.
Copyright (C) 2015-2020 Vladimir Menshakov
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef AFTL_MTP_PTP_IOBJECTSTREAM_H
#define AFTL_MTP_PTP_IOBJECTSTREAM_H
#include <mtp/types.h>
#include <atomic>
#include <stdexcept>
namespace mtp
{
struct ICancellableStream //! interfaces for streams with cancellation functionality
{
virtual ~ICancellableStream() = default;
virtual void Cancel() = 0;
};
DECLARE_PTR(ICancellableStream);
struct OperationCancelledException : public std::runtime_error //! exception thrown if stream was cancelled
{
OperationCancelledException(): std::runtime_error("operation cancelled") { }
};
class CancellableStream : public virtual ICancellableStream //! default implementation of \ref ICancellableStream
{
std::atomic_bool _cancelled;
public:
CancellableStream(): _cancelled(false)
{ }
void Cancel()
{ _cancelled.store(true); }
void CheckCancelled()
{
bool cancelled = _cancelled.load();
if (cancelled)
throw OperationCancelledException();
}
};
struct IObjectInputStream : public virtual ICancellableStream //! Basic input stream interface
{
virtual u64 GetSize() const = 0;
virtual size_t Read(u8 *data, size_t size) = 0;
};
DECLARE_PTR(IObjectInputStream);
struct IObjectOutputStream : public virtual ICancellableStream //! Basic output stream interface
{
virtual size_t Write(const u8 *data, size_t size) = 0;
};
DECLARE_PTR(IObjectOutputStream);
}
#endif /* IOBJECTSTREAM_H */
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