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Add factory method to archive.js that returns an Unrarrer/Unzipper/Untarrer

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codedread 2017-02-19 09:22:47 -08:00
parent e23674f5e2
commit 9305f4e11b
1 changed files with 21 additions and 0 deletions
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21
archive.js
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@ -350,4 +350,25 @@ bitjs.archive.Untarrer = function(arrayBuffer, opt_pathToBitJS) {
bitjs.inherits(bitjs.archive.Untarrer, bitjs.archive.Unarchiver);
bitjs.archive.Untarrer.prototype.getScriptFileName = function() { return 'untar.js' };
/**
* Factory method that creates an unarchiver based on the byte signature found
* in the arrayBuffer.
* @param {ArrayBuffer} ab
* @param {string=} opt_pathToBitJS Path to the unarchiver script files.
* @return {bitjs.archive.Unarchiver}
*/
bitjs.archive.GetUnarchiver = function(ab, opt_pathToBitJS) {
var unarchiver = null;
var pathToBitJS = opt_pathToBitJS || '';
var h = new Uint8Array(ab, 0, 10);
if (h[0] == 0x52 && h[1] == 0x61 && h[2] == 0x72 && h[3] == 0x21) { //Rar!
unarchiver = new bitjs.archive.Unrarrer(ab, pathToBitJS);
} else if (h[0] == 80 && h[1] == 75) { // PK (Zip)
unarchiver = new bitjs.archive.Unzipper(ab, pathToBitJS);
} else { // Try with tar
unarchiver = new bitjs.archive.Untarrer(ab, pathToBitJS);
}
return unarchiver;
};
})();