svgedit/firefox-extension/handlers.js

// Note: This JavaScript file must be included as the last script on the main HTML editor page to override the open/save handlers
$(function() {
	if(!window.Components) return;

	function moz_file_picker(readflag) {
	    var fp = window.Components.classes["@mozilla.org/filepicker;1"].
		createInstance(Components.interfaces.nsIFilePicker);
	    if(readflag)
		fp.init(window, "Pick a SVG file", fp.modeOpen);
	    else
		fp.init(window, "Pick a SVG file", fp.modeSave);
	    fp.defaultExtension = "*.svg";
	    fp.show();
	    return fp.file;
	}

	svgCanvas.setCustomHandlers({
		'open':function() {
		    try {
			netscape.security.PrivilegeManager.
			enablePrivilege("UniversalXPConnect");
			var file = moz_file_picker(true);
			if(!file)
			    return(null);

			var inputStream = Components.classes["@mozilla.org/network/file-input-stream;1"].createInstance(Components.interfaces.nsIFileInputStream);
			inputStream.init(file, 0x01, 00004, null);
			var sInputStream = Components.classes["@mozilla.org/scriptableinputstream;1"].createInstance(Components.interfaces.nsIScriptableInputStream);
			sInputStream.init(inputStream);
			svgCanvas.setSvgString(sInputStream.
					    read(sInputStream.available()));
		    } catch(e) {
                        console.log("Exception while attempting to load" + e);
		    }
		},
		'save':function(svg, str) {
			try {
				var file = moz_file_picker(false);
				if(!file)
					return;

							if (!file.exists())
					file.create(0, 0664);

				var out = Components.classes["@mozilla.org/network/file-output-stream;1"].createInstance(Components.interfaces.nsIFileOutputStream);
				out.init(file, 0x20 | 0x02, 00004,null);
				out.write(str, str.length);
				out.flush();
				out.close();
				} catch(e) {
				alert(e);
		    }
		}
	});
});