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Improve detection of JPEG, GIF and PNG without extensions

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This commit is contained in:
Dan Stillman 2007-10-23 05:54:03 +00:00
parent 9a44efa8cf
commit 6783ba91c3
1 changed files with 27 additions and 10 deletions
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37
chrome/content/zotero/xpcom/mime.js
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@ -34,15 +34,19 @@ Zotero.MIME = new function(){
// Magic numbers // Magic numbers
var _snifferEntries = [ var _snifferEntries = [
["%PDF-", "application/pdf"], ["%PDF-", "application/pdf", 0],
["%!PS-Adobe-", 'application/postscript'], ["%!PS-Adobe-", 'application/postscript', 0],
["%! PS-Adobe-", 'application/postscript'], ["%! PS-Adobe-", 'application/postscript', 0],
["From", 'text/plain'], ["From", 'text/plain', 0],
[">From", 'text/plain'], [">From", 'text/plain', 0],
["#!", 'text/plain'], ["#!", 'text/plain', 0],
["<?xml", 'text/xml'], ["<?xml", 'text/xml', 0],
["<!DOCTYPE html", 'text/html'], ["<!DOCTYPE html", 'text/html', 0],
["<html", 'text/html'] ["<html", 'text/html', 0],
["\uFFFD\uFFFD", 'image/jpeg', 0],
["JFIF", 'image/jpeg'],
["GIF8", 'image/gif', 0],
["\uFFFDPNG", 'image/png', 0]
]; ];
var _textTypes = { var _textTypes = {
@ -116,7 +120,20 @@ Zotero.MIME = new function(){
*/ */
function sniffForMIMEType(str){ function sniffForMIMEType(str){
for (var i in _snifferEntries){ for (var i in _snifferEntries){
if (str.indexOf(_snifferEntries[i][0])==0){ var 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) {
match = true;
}
}
// Otherwise allow match anywhere in sample
// (128 bytes from getSample() by default)
else if (str.indexOf(_snifferEntries[i][0]) != -1) {
match = true;
}
if (match) {
return _snifferEntries[i][1]; return _snifferEntries[i][1];
} }
} }