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Fix inconsequential bug in Zotero.MIME.sniffForMIMEType()

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`undefined` was being passed as an argument to slice(), but 0 is the
only offset that's used anyway, and that's what happens if you pass
`undefined`.
This commit is contained in:
Dan Stillman 2018-05-05 00:09:35 -04:00
parent 7271fdf6b7
commit 9220b2d9c2
1 changed files with 6 additions and 7 deletions
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13
chrome/content/zotero/xpcom/mime.js
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@ -26,7 +26,6 @@
Zotero.MIME = new function(){
this.isTextType = isTextType;
this.getPrimaryExtension = getPrimaryExtension;
this.sniffForMIMEType = sniffForMIMEType;
this.sniffForBinary = sniffForBinary;
this.hasNativeHandler = hasNativeHandler;
this.hasInternalHandler = hasInternalHandler;
@ -228,12 +227,12 @@ Zotero.MIME = new function(){
/*
* Searches string for magic numbers
*/
function sniffForMIMEType(str){
for (var i in _snifferEntries){
var match = false;
this.sniffForMIMEType = function (str) {
for (let i in _snifferEntries) {
let match = false;
// If an offset is defined, match only from there
if (typeof _snifferEntries[i][2] != 'undefined') {
if (str.substr(i[2]).indexOf(_snifferEntries[i][0]) == 0) {
if (_snifferEntries[i][2] != undefined) {
if (str.substr(_snifferEntries[i][2]).indexOf(_snifferEntries[i][0]) == 0) {
match = true;
}
}
@ -274,7 +273,7 @@ Zotero.MIME = new function(){
* ext is an optional file extension hint if data sniffing is unsuccessful
*/
this.getMIMETypeFromData = function (str, ext){
var mimeType = sniffForMIMEType(str);
var mimeType = this.sniffForMIMEType(str);
if (mimeType){
Zotero.debug('Detected MIME type ' + mimeType);
return mimeType;