The GtkRadiant sources as originally released under the GPL license.

include/idatastream.h

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+/*
+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