module Sass::Compiler::Varint

def length(value)
  return 1 if value < 128
  (value.bit_length + 6) / 7
end

def read(readable)
  value = bits = 0
  loop do
    byte = readable.readbyte
    value |= (byte & 0x7f) << bits
    bits += 7
    break if byte < 0x80
  end
  value
end

def write(writeable, value)
  until value < 0x80
    writeable << ((value & 0x7f) | 0x80)
    value >>= 7
  end
  writeable << value
end