dox-foundation-demo node_modules/express/node_modules/range-parser/index.js

exports

method
module.exports()
  • @param: {Number}size
  • @param: {String}str
  • @return: {Array}

Description

Parse "Range" header str relative to the given file size.

Source

module.exports = function(size, str){
  var valid = true;
  var i = str.indexOf('=');

  if (-1 == i) return -2;

  var arr = str.slice(i + 1).split(',').map(function(range){
    var range = range.split('-')
      , start = parseInt(range[0], 10)
      , end = parseInt(range[1], 10);

    // -nnn
    if (isNaN(start)) {
      start = size - end;
      end = size - 1;
    // nnn-
    } else if (isNaN(end)) {
      end = size - 1;
    }

    // limit last-byte-pos to current length
    if (end > size - 1) end = size - 1;

    // invalid
    if (isNaN(start)
      || isNaN(end)
      || start > end
      || start < 0) valid = false;

    return {
      start: start,
      end: end
    };
  });

  arr.type = str.slice(0, i);

  return valid ? arr : -1;
};