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assets/webapps/nfc-api-test.gaiamobile.org/js/ndef_helper.js

@@ -0,0 +1,75 @@
+'use strict';
+
+(function(exports) {
+  var URI = ['', 'http://www.', 'https://www.', 'http://', 'https://', 'tel:',
+    'mailto:', 'ftp://anonymous:anonymous@', 'ftp://ftp.', 'ftps://', 'sftp://',
+    'smb://', 'nfs://', 'ftp://', 'dav://', 'news:', 'telnet://', 'imap:',
+    'rtsp://', 'urn:', 'pop:', 'sip:', 'sips:', 'tftp:', 'btspp://',
+    'btl2cap://', 'btgoep://', 'tcpobex://', 'irdaobex://', 'file://',
+    'urn:epc:id:', 'urn:epc:tag:', 'urn:epc:pat:', 'urn:epc:raw:', 'urn:epc:',
+    'urn:nfc:'];
+
+  function NDEFHelper() { }
+
+  NDEFHelper.prototype = {
+    /**
+     * Create MozNDEFRecord whose content is the uri.
+     */
+    createURI: function nh_createURI(uri) {
+
+      var id = 0;
+      // start with 1 since index 0 is ''.
+      for (var i = 1; i < URI.length; i++) {
+        if (uri.startsWith(URI[i])) {
+          id = i;
+        }
+      }
+
+      uri = String.fromCharCode(id) + uri.substring(URI[id].length);
+
+      var enc = new TextEncoder('utf-8');
+
+      return new MozNDEFRecord({tnf: 'well-known',
+                                type: enc.encode('U'),
+                                payload: enc.encode(uri)});
+    },
+
+    parseURI: function nh_parseURI(ndef) {
+      if (!ndef || ndef.tnf != 'well-known' || ndef.type[0] != 0x55) {
+        return null;
+      }
+
+      var payload = ndef.payload;
+      var prefix = URI[payload[0]];
+      if (!prefix) {
+        return null;
+      }
+
+      var dec = new TextDecoder('utf-8');
+      return prefix + dec.decode(payload.subarray(1));
+    },
+
+    /**
+     * Utils to dump Uint8Array.
+     */
+    dumpUint8Array: function nh_dumpUint8Array(array) {
+      if (!array) {
+        return 'null';
+      }
+
+      var str = '[';
+      var i;
+      var arrayLen = array ? array.length : 0;
+      for (i = 0; i < arrayLen; i++) {
+        str += '0x' + array[i].toString(16);
+        if (i != array.length - 1) {
+          str += ', ';
+        }
+      }
+
+      return str + ']';
+    }
+  };
+
+  exports.NDEFHelper = NDEFHelper;
+})(window);