84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
/*
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Copyright (C) 2001-2006, William Joseph.
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All Rights Reserved.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if !defined( INCLUDED_IDATASTREAM_H )
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#define INCLUDED_IDATASTREAM_H
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#include <cstddef>
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class StreamBase
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{
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public:
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typedef std::size_t size_type;
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typedef unsigned char byte_type;
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};
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/// \brief A read-only byte-stream.
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class InputStream : public StreamBase
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{
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public:
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/// \brief Attempts to read the next \p length bytes from the stream to \p buffer.
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/// Returns the number of bytes actually stored in \p buffer.
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virtual size_type read( byte_type* buffer, size_type length ) = 0;
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};
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/// \brief A write-only byte-stream.
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class OutputStream : public StreamBase
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{
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public:
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/// \brief Attempts to write \p length bytes to the stream from \p buffer.
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/// Returns the number of bytes actually read from \p buffer.
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virtual size_type write( const byte_type* buffer, size_type length ) = 0;
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};
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class SeekableStream
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{
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public:
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typedef int offset_type;
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typedef std::size_t position_type;
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enum seekdir
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{
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beg,
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cur,
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end,
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};
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/// \brief Sets the current \p position of the stream relative to the start.
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virtual position_type seek( position_type position ) = 0;
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/// \brief Sets the current \p position of the stream relative to either the start, end or current position.
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virtual position_type seek( offset_type offset, seekdir direction ) = 0;
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/// \brief Returns the current position of the stream.
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virtual position_type tell() const = 0;
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};
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/// \brief A seekable read-only byte-stream.
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class SeekableInputStream : public InputStream, public SeekableStream
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{
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};
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/// \brief A seekable write-only byte-stream.
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class SeekableOutputStream : public OutputStream, public SeekableStream
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{
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};
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#endif
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