code: function matchEndOfBodySymbol (stream, line) {
    const isLastLineEmpty = (stream._lastLineEmpty)
    if (!isEmpty(line)) {
      stream._lastLineEmpty = false
      return null
    } else if (!stream._isProgressFlag) {
      return true
    } else if (isLastLineEmpty) {
      return true
    } else {
      stream._lastLineEmpty = true
      return null
    }
  }
docs: This function determines if the end of the body section has been reached, an empty line is emited by 7z at the end of the body, so this function use this as an indicator. When the progress switch is activated the `formatByLine()` method adds additionnal empty lines: By adding a marker to the `SevenZipStream` object the function can detect two empty lines in a row.