106 lines
3.0 KiB
JavaScript
106 lines
3.0 KiB
JavaScript
"use strict";
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const PizZipUtils = {};
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// just use the responseText with xhr1, response with xhr2.
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// The transformation doesn't throw away high-order byte (with responseText)
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// because PizZip handles that case. If not used with PizZip, you may need to
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// do it, see https://developer.mozilla.org/En/Using_XMLHttpRequest#Handling_binary_data
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PizZipUtils._getBinaryFromXHR = function (xhr) {
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// for xhr.responseText, the 0xFF mask is applied by PizZip
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return xhr.response || xhr.responseText;
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};
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// taken from jQuery
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function createStandardXHR() {
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try {
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return new window.XMLHttpRequest();
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} catch (e) {}
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}
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function createActiveXHR() {
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try {
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return new window.ActiveXObject("Microsoft.XMLHTTP");
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} catch (e) {}
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}
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// Create the request object
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const createXHR = window.ActiveXObject
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? /* Microsoft failed to properly
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* implement the XMLHttpRequest in IE7 (can't request local files),
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* so we use the ActiveXObject when it is available
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* Additionally XMLHttpRequest can be disabled in IE7/IE8 so
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* we need a fallback.
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*/
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function () {
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return createStandardXHR() || createActiveXHR();
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}
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: // For all other browsers, use the standard XMLHttpRequest object
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createStandardXHR;
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PizZipUtils.getBinaryContent = function (path, callback) {
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/*
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* Here is the tricky part : getting the data.
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* In firefox/chrome/opera/... setting the mimeType to 'text/plain; charset=x-user-defined'
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* is enough, the result is in the standard xhr.responseText.
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* cf https://developer.mozilla.org/En/XMLHttpRequest/Using_XMLHttpRequest#Receiving_binary_data_in_older_browsers
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* In IE <= 9, we must use (the IE only) attribute responseBody
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* (for binary data, its content is different from responseText).
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* In IE 10, the 'charset=x-user-defined' trick doesn't work, only the
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* responseType will work :
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* http://msdn.microsoft.com/en-us/library/ie/hh673569%28v=vs.85%29.aspx#Binary_Object_upload_and_download
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*
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* I'd like to use jQuery to avoid this XHR madness, but it doesn't support
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* the responseType attribute : http://bugs.jquery.com/ticket/11461
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*/
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try {
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const xhr = createXHR();
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xhr.open("GET", path, true);
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// recent browsers
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if ("responseType" in xhr) {
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xhr.responseType = "arraybuffer";
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}
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// older browser
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if (xhr.overrideMimeType) {
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xhr.overrideMimeType("text/plain; charset=x-user-defined");
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}
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xhr.onreadystatechange = function (evt) {
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let file, err;
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// use `xhr` and not `this`... thanks IE
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if (xhr.readyState === 4) {
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if (xhr.status === 200 || xhr.status === 0) {
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file = null;
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err = null;
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try {
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file = PizZipUtils._getBinaryFromXHR(xhr);
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} catch (e) {
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err = new Error(e);
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}
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callback(err, file);
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} else {
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callback(
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new Error(
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"Ajax error for " +
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path +
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" : " +
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this.status +
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" " +
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this.statusText
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),
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null
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);
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}
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}
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};
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xhr.send();
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} catch (e) {
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callback(new Error(e), null);
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}
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};
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module.exports = PizZipUtils;
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