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sortix--sortix/sortix/stream.h
2012-01-18 01:11:17 +01:00

70 lines
1.7 KiB
C++

/******************************************************************************
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
This file is part of Sortix.
Sortix is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
Sortix 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 General Public License for more
details.
You should have received a copy of the GNU General Public License along
with Sortix. If not, see <http://www.gnu.org/licenses/>.
stream.h
Various device types that provides a sequence of bytes.
******************************************************************************/
#ifndef SORTIX_STREAM_H
#define SORTIX_STREAM_H
#include "device.h"
namespace Sortix
{
class DevStream : public Device
{
public:
typedef Device BaseClass;
public:
virtual bool IsType(unsigned type) const { return type == Device::STREAM; }
public:
virtual ssize_t Read(byte* dest, size_t count) = 0;
virtual ssize_t Write(const byte* src, size_t count) = 0;
virtual bool IsReadable() = 0;
virtual bool IsWritable() = 0;
};
class DevBuffer : public DevStream
{
public:
typedef DevStream BaseClass;
public:
virtual bool IsType(unsigned type) const
{
return type == Device::BUFFER || BaseClass::IsType(type);
}
public:
virtual size_t BlockSize() = 0;
virtual uintmax_t Size() = 0;
virtual uintmax_t Position() = 0;
virtual bool Seek(uintmax_t position) = 0;
virtual bool Resize(uintmax_t size) = 0;
};
}
#endif