PNG  IHDR;IDATxܻn0K )(pA 7LeG{ §㻢|ذaÆ 6lذaÆ 6lذaÆ 6lom$^yذag5bÆ 6lذaÆ 6lذa{ 6lذaÆ `}HFkm,mӪôô! x|'ܢ˟;E:9&ᶒ}{v]n&6 h_tڠ͵-ҫZ;Z$.Pkž)!o>}leQfJTu іچ\X=8Rن4`Vwl>nG^is"ms$ui?wbs[m6K4O.4%/bC%t Mז -lG6mrz2s%9s@-k9=)kB5\+͂Zsٲ Rn~GRC wIcIn7jJhۛNCS|j08yiHKֶۛkɈ+;SzL/F*\Ԕ#"5m2[S=gnaPeғL lذaÆ 6l^ḵaÆ 6lذaÆ 6lذa; _ذaÆ 6lذaÆ 6lذaÆ RIENDB` /*! * range-parser * Copyright(c) 2012-2014 TJ Holowaychuk * Copyright(c) 2015-2016 Douglas Christopher Wilson * MIT Licensed */ 'use strict' /** * Module exports. * @public */ module.exports = rangeParser /** * Parse "Range" header `str` relative to the given file `size`. * * @param {Number} size * @param {String} str * @param {Object} [options] * @return {Array} * @public */ function rangeParser (size, str, options) { if (typeof str !== 'string') { throw new TypeError('argument str must be a string') } var index = str.indexOf('=') if (index === -1) { return -2 } // split the range string var arr = str.slice(index + 1).split(',') var ranges = [] // add ranges type ranges.type = str.slice(0, index) // parse all ranges for (var i = 0; i < arr.length; i++) { var range = arr[i].split('-') var start = parseInt(range[0], 10) var 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 or unsatisifiable if (isNaN(start) || isNaN(end) || start > end || start < 0) { continue } // add range ranges.push({ start: start, end: end }) } if (ranges.length < 1) { // unsatisifiable return -1 } return options && options.combine ? combineRanges(ranges) : ranges } /** * Combine overlapping & adjacent ranges. * @private */ function combineRanges (ranges) { var ordered = ranges.map(mapWithIndex).sort(sortByRangeStart) for (var j = 0, i = 1; i < ordered.length; i++) { var range = ordered[i] var current = ordered[j] if (range.start > current.end + 1) { // next range ordered[++j] = range } else if (range.end > current.end) { // extend range current.end = range.end current.index = Math.min(current.index, range.index) } } // trim ordered array ordered.length = j + 1 // generate combined range var combined = ordered.sort(sortByRangeIndex).map(mapWithoutIndex) // copy ranges type combined.type = ranges.type return combined } /** * Map function to add index value to ranges. * @private */ function mapWithIndex (range, index) { return { start: range.start, end: range.end, index: index } } /** * Map function to remove index value from ranges. * @private */ function mapWithoutIndex (range) { return { start: range.start, end: range.end } } /** * Sort function to sort ranges by index. * @private */ function sortByRangeIndex (a, b) { return a.index - b.index } /** * Sort function to sort ranges by start position. * @private */ function sortByRangeStart (a, b) { return a.start - b.start }