IronRuby.Builtins.RubyBufferedStream.Seek C# (CSharp) Method

        public override long Seek(long pos, SeekOrigin origin) {
            if (origin == SeekOrigin.Current) {
                if (_pushBackPreservesPosition) {
                    pos -= ReadAheadCount;
                } else {
                    origin = SeekOrigin.Begin;
                    pos += Position;
                }
            }

            // try seek first, it may fail and we shouldn't change the buffer if so:
            var result = _stream.Seek(pos, origin);

            // TODO: we might keep the buffered data if we seek within the buffered data (but not in pushed back data):
            // clear any buffer content (including ungetc):
            _bufferStart = _bufferCount = _pushedBackCount = 0;

            return result;
        }