1 files changed, 35 insertions, 0 deletions
diff --git a/node_modules/crc/lib/crc16_xmodem.js b/node_modules/crc/lib/crc16_xmodem.js
new file mode 100644
index 000000000..03bf56087
--- /dev/null
+++ b/node_modules/crc/lib/crc16_xmodem.js
@@ -0,0 +1,35 @@
+'use strict';
+
+var _buffer = require('buffer');
+
+var _create_buffer = require('./create_buffer');
+
+var _create_buffer2 = _interopRequireDefault(_create_buffer);
+
+var _define_crc = require('./define_crc');
+
+var _define_crc2 = _interopRequireDefault(_define_crc);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+module.exports = (0, _define_crc2.default)('xmodem', function (buf, previous) {
+  if (!_buffer.Buffer.isBuffer(buf)) buf = (0, _create_buffer2.default)(buf);
+
+  var crc = typeof previous !== 'undefined' ? ~~previous : 0x0;
+
+  for (var index = 0; index < buf.length; index++) {
+    var byte = buf[index];
+    var code = crc >>> 8 & 0xFF;
+
+    code ^= byte & 0xFF;
+    code ^= code >>> 4;
+    crc = crc << 8 & 0xFFFF;
+    crc ^= code;
+    code = code << 5 & 0xFFFF;
+    crc ^= code;
+    code = code << 7 & 0xFFFF;
+    crc ^= code;
+  }
+
+  return crc;
+});
+\ No newline at end of file