# File lib/buffered_io.rb, line 7
 7:   def initialize(io)
 8:     super
 9:     @io = io
10:     @buffer = ''
11:     @pos = 0
12:     @iobase = @io.pos
13:   end

    # File lib/buffered_io.rb, line 15
15:   def flush
16:     @iobase += @pos
17:     @buffer = ''
18:     @pos = 0
19:     @io.flush
20:   end

    # File lib/buffered_io.rb, line 32
32:   def pos
33:     @iobase + @pos
34:   end

    # File lib/buffered_io.rb, line 36
36:   def pos=(newpos)
37:     seek(newpos) 
38:   end

    # File lib/buffered_io.rb, line 22
22:   def read(size, buffer = nil)
23:     if (@buffer.size - @pos) < size
24:       @buffer += @io.read(BLOCK_SIZE)
25:     end
26:     result = @buffer[@pos,size]
27:     @pos += result.size
28:     buffer.replace(result) if buffer
29:     result
30:   end

    # File lib/buffered_io.rb, line 40
40:   def seek(amount, whence=IO::SEEK_SET)
41:     case whence
42:     when IO::SEEK_CUR
43:       raise "rewind before buffer start" if (amount < @pos)
44:       @pos -= amount
45:       @iobase + @pos
46:       
47:     when IO::SEEK_END
48:       raise "Sorry this operation is not supported"
49:       
50:     when IO::SEEK_SET
51:       raise "rewind before buffer start" if (amount < @iobase)
52:       @pos = amount - @iobase
53:       @iobase + @pos      
54:     end
55:   end