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Viewing file:     crc16xmodem.js (1011 B)      -rw-r--r--

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

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 }; }

var crc16xmodem = (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;
});

exports.default = crc16xmodem;