BrunoLM

if (!System) var System = { };
if (!System.OneMangaManager) System.OneMangaManager = { };
if (!System.OneMangaManager.File) System.OneMangaManager.File = { };

System.OneMangaManager.File =
{
    Choose:
        function(Title, Mode)
        {
            try
            {
                const IFP = Components.interfaces.nsIFilePicker;
                const fp = Components.classes["@mozilla.org/filepicker;1"].createInstance(IFP);

                fp.init(window, Title, IFP["mode" + Mode]);
                fp.appendFilter("OneManga Manager (*.omm)", "*.omm");
                fp.filterIndex = 0;
                fp.defaultExtension = "omm";
                const ret = fp.show();
                if (ret == IFP.returnOK || ret == IFP.returnReplace) return fp.file;
                else return;
            }
            catch(ex) { }
            return;
        },

    Write:
        function (File, Text)
        {
            if (!File) return;
            const unicodeConverter = Components.classes["@mozilla.org/intl/scriptableunicodeconverter"]
                .createInstance(Components.interfaces.nsIScriptableUnicodeConverter);

            unicodeConverter.charset = "UTF-8";

            Text = unicodeConverter.ConvertFromUnicode(Text);
            const os = Components.classes["@mozilla.org/network/file-output-stream;1"]
              .createInstance(Components.interfaces.nsIFileOutputStream);
            os.init(File, 0x02 | 0x08 | 0x20, 0700, 0);
            os.write(Text, Text.length);
            os.close();
        },

    Read:
        function (File)
        {
            if (!File) return;
            var res;

            const is = Components.classes["@mozilla.org/network/file-input-stream;1"]
                .createInstance(Components.interfaces.nsIFileInputStream);
            const sis = Components.classes["@mozilla.org/scriptableinputstream;1"]
                .createInstance(Components.interfaces.nsIScriptableInputStream);
            is.init(File, 0x01, 0400, null);
            sis.init(is);

            res = sis.read(sis.available());

            is.close();

            return res;
        },

    ReadUrl:
        function (aURL)
        {
            var ioService=Components.classes["@mozilla.org/network/io-service;1"]
                .getService(Components.interfaces.nsIIOService);
            var scriptableStream=Components
                .classes["@mozilla.org/scriptableinputstream;1"]
                .getService(Components.interfaces.nsIScriptableInputStream);

            var channel=ioService.newChannel(aURL,null,null);
            var input=channel.open();
            scriptableStream.init(input);
            var str=scriptableStream.read(input.available());
            scriptableStream.close();
            input.close();
            return str;
        }
};