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/**
* Parse "Range" header `str` relative to the given file `size`.
*
* @param {Number} size
* @param {String} str
* @return {Array}
* @api public
*/
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;
};
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