js/localFile.js

   1 (function () {
   2
   3      Rakka.canAccessLocalFile = function () {
   4          return $.browser.mozilla;
   5      };
   6
   7      var loadBin_mozilla = function (localFile) {
   8          /* localFile: nsILocalFile */
   9
  10          try {
  11              netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
  12          }
  13          catch (e) {
  14              alert("Permission to read local file was denied. " +
  15                    "Open about:config and check that " +
  16                    "signed.applets.codebase_principal_support is set to true.");
  17          }
  18
  19          var stream
  20              = Components.classes["@mozilla.org/network/file-input-stream;1"].createInstance(
  21                  Components.interfaces.nsIFileInputStream);
  22          stream.init(localFile, 0x01, 00004, null);
  23
  24          var bstream
  25              = Components.classes["@mozilla.org/network/buffered-input-stream;1"].getService();
  26          bstream.QueryInterface(Components.interfaces.nsIBufferedInputStream);
  27          bstream.init(stream, 1000);
  28          bstream.QueryInterface(Components.interfaces.nsIInputStream);
  29
  30          var binary
  31              = Components.classes["@mozilla.org/binaryinputstream;1"].createInstance(
  32                  Components.interfaces.nsIBinaryInputStream);
  33          binary.setInputStream(stream);
  34
  35          return binary.readBytes(binary.available());
  36      };
  37
  38      var selectFile_mozilla = function (title, mode) {
  39          try {
  40              netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
  41          }
  42          catch (e) {
  43              alert("Permission to select local file was denied. " +
  44                    "Open about:config and check that " +
  45                    "signed.applets.codebase_principal_support is set to true.");
  46          }
  47
  48          var nsIFilePicker = Components.interfaces.nsIFilePicker;
  49
  50          var modeID;
  51          if (mode == "open") {
  52              modeID = nsIFilePicker.modeOpen;
  53          }
  54          else if (mode == "save") {
  55              modeID = nsIFilePicker.modeSave;
  56          }
  57          else if (mode == "getFolder") {
  58              modeID = nsIFilePicker.modeGetFolder;
  59          }
  60          else if (mode == "modeOpenMultiple") {
  61              modeID = nsIFilePicker.modeOpenMultiple;
  62          }
  63          else {
  64              throw new Error("Unknown file picker mode: " + mode);
  65          }
  66
  67          var picker = Components
  68                           .classes["@mozilla.org/filepicker;1"]
  69                               .createInstance(nsIFilePicker);
  70          picker.init(window, title, modeID);
  71          picker.appendFilters(nsIFilePicker.filterAll);
  72
  73          var ret = picker.show();
  74          if (ret == nsIFilePicker.returnOK || ret == nsIFilePicker.returnReplace) {
  75              return picker.file;
  76          }
  77          else {
  78              return null;
  79          }
  80      };
  81
  82      Rakka.selectFile = function (title, mode) {
  83          if ($.browser.mozilla) {
  84              return selectFile_mozilla(title, mode);
  85          }
  86          else {
  87              throw new Error("It's not possible to select local files using JavaScript with your browser. Consider using Firefox.");
  88          }
  89      };
  90
  91      Rakka.loadLocalBinaryFile = function (file) {
  92          if ($.browser.mozilla) {
  93              return loadBin_mozilla(file);
  94          }
  95          else {
  96              throw new Error("It's not possible to load local files using JavaScript with your browser. Consider using Firefox.");
  97          }
  98      };
  99
 100 })();