class GPGME::IOCallbacks

def initialize(io)
  @io = io
end

def read(hook, length)
  @io.read(length)
end

def seek(hook, offset, whence)
  return @io.pos if offset == 0 && whence == IO::SEEK_CUR
  @io.seek(offset, whence)
  @io.pos
end

def write(hook, buffer, length)
  @io.write(buffer[0 .. length])
end