module.exports = read

var MSB = 0x80
  , REST = 0x7F

function read(buf, offset) {
  var res    = 0
    , offset = offset || 0
    , shift  = 0
    , counter = offset
    , b
  
  do {
    b = buf[counter++]
    res += shift < 28
      ? (b & REST) << shift
      : (b & REST) * Math.pow(2, shift)
    shift += 7
  } while (b >= MSB)
  
  if(b === undefined) {
    read.bytesRead = 0
    res = undefined
  }
  else
    read.bytesRead = counter - offset
  
  return res
}