vmap/include/idatastream.h

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2020-11-17 11:16:16 +00:00
/*
Copyright (C) 2001-2006, William Joseph.
All Rights Reserved.
This file is part of GtkRadiant.
GtkRadiant 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 2 of the License, or
(at your option) any later version.
GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#if !defined( INCLUDED_IDATASTREAM_H )
#define INCLUDED_IDATASTREAM_H
#include <cstddef>
class StreamBase
{
public:
typedef std::size_t size_type;
typedef unsigned char byte_type;
};
/// \brief A read-only byte-stream.
class InputStream : public StreamBase
{
public:
/// \brief Attempts to read the next \p length bytes from the stream to \p buffer.
/// Returns the number of bytes actually stored in \p buffer.
virtual size_type read( byte_type* buffer, size_type length ) = 0;
};
/// \brief A write-only byte-stream.
class OutputStream : public StreamBase
{
public:
/// \brief Attempts to write \p length bytes to the stream from \p buffer.
/// Returns the number of bytes actually read from \p buffer.
virtual size_type write( const byte_type* buffer, size_type length ) = 0;
};
class SeekableStream
{
public:
typedef int offset_type;
typedef std::size_t position_type;
enum seekdir
{
beg,
cur,
end,
};
/// \brief Sets the current \p position of the stream relative to the start.
virtual position_type seek( position_type position ) = 0;
/// \brief Sets the current \p position of the stream relative to either the start, end or current position.
virtual position_type seek( offset_type offset, seekdir direction ) = 0;
/// \brief Returns the current position of the stream.
virtual position_type tell() const = 0;
};
/// \brief A seekable read-only byte-stream.
class SeekableInputStream : public InputStream, public SeekableStream
{
};
/// \brief A seekable write-only byte-stream.
class SeekableOutputStream : public OutputStream, public SeekableStream
{
};
#endif