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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_JOINEDOBJECTSTREAM_H
#define AFTL_MTP_PTP_JOINEDOBJECTSTREAM_H
#include <mtp/ptp/IObjectStream.h>
namespace mtp
{
class JoinedObjectInputStreamBase : public IObjectInputStream, public CancellableStream
{
protected:
bool _stream1Exhausted;
virtual IObjectInputStreamPtr GetStream1() const = 0;
virtual IObjectInputStreamPtr GetStream2() const = 0;
virtual void OnStream1Exhausted() { }
public:
JoinedObjectInputStreamBase(): _stream1Exhausted(false) { }
virtual size_t Read(u8 *data, size_t size)
{
CheckCancelled();
size_t r;
if (!_stream1Exhausted)
{
r = GetStream1()->Read(data, size);
if (r < size)
{
_stream1Exhausted = true;
OnStream1Exhausted();
r += GetStream2()->Read(data + r, size - r);
}
}
else
r = GetStream2()->Read(data, size);
return r;
}
};
class JoinedObjectInputStream final: public JoinedObjectInputStreamBase //! Input stream made of two subsequent stream
{
IObjectInputStreamPtr _stream1, _stream2;
size_t _stream1Size, _stream2Size;
private:
virtual IObjectInputStreamPtr GetStream1() const
{ return _stream1; }
virtual IObjectInputStreamPtr GetStream2() const
{ return _stream2; }
public:
JoinedObjectInputStream(IObjectInputStreamPtr s1, IObjectInputStreamPtr s2):
_stream1(s1), _stream2(s2), _stream1Size(s1->GetSize()), _stream2Size(s2->GetSize())
{ }
virtual u64 GetSize() const
{ return _stream1Size + _stream2Size; }
};
DECLARE_PTR(JoinedObjectInputStream);
class JoinedObjectOutputStreamBase : public IObjectOutputStream, public CancellableStream
{
protected:
bool _stream1Exhausted;
virtual IObjectOutputStreamPtr GetStream1() const = 0;
virtual IObjectOutputStreamPtr GetStream2() const = 0;
virtual void OnStream1Exhausted() { }
public:
JoinedObjectOutputStreamBase(): _stream1Exhausted(false) { }
size_t Write(const u8 *data, size_t size) override
{
CheckCancelled();
size_t r;
if (!_stream1Exhausted)
{
r = GetStream1()->Write(data, size);
if (r < size)
{
_stream1Exhausted = true;
OnStream1Exhausted();
r += GetStream2()->Write(data + r, size - r);
}
}
else
r = GetStream2()->Write(data, size);
return r;
}
};
class JoinedObjectOutputStream final: public JoinedObjectOutputStreamBase //! Output stream made of two subsequent stream
{
IObjectOutputStreamPtr _stream1, _stream2;
private:
virtual IObjectOutputStreamPtr GetStream1() const
{ return _stream1; }
virtual IObjectOutputStreamPtr GetStream2() const
{ return _stream2; }
public:
JoinedObjectOutputStream(IObjectOutputStreamPtr s1, IObjectOutputStreamPtr s2):
_stream1(s1), _stream2(s2)
{ }
};
DECLARE_PTR(JoinedObjectOutputStream);
}
#endif /* JOINEDOBJECTSTREAM_H */
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