kontainer-js/Matroska/EBMLElement/TypeInt.js

A media file format generator/parser that exposes a React-like API.

'use strict';

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

var _slicedToArray2 = require('babel-runtime/helpers/slicedToArray');

var _slicedToArray3 = _interopRequireDefault(_slicedToArray2);

var _getPrototypeOf = require('babel-runtime/core-js/object/get-prototype-of');

var _getPrototypeOf2 = _interopRequireDefault(_getPrototypeOf);

var _classCallCheck2 = require('babel-runtime/helpers/classCallCheck');

var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);

var _createClass2 = require('babel-runtime/helpers/createClass');

var _createClass3 = _interopRequireDefault(_createClass2);

var _possibleConstructorReturn2 = require('babel-runtime/helpers/possibleConstructorReturn');

var _possibleConstructorReturn3 = _interopRequireDefault(_possibleConstructorReturn2);

var _get2 = require('babel-runtime/helpers/get');

var _get3 = _interopRequireDefault(_get2);

var _inherits2 = require('babel-runtime/helpers/inherits');

var _inherits3 = _interopRequireDefault(_inherits2);

var _Element2 = require('./Element');

var _Element3 = _interopRequireDefault(_Element2);

var _Writer = require('../../core/Writer');

var _Writer2 = _interopRequireDefault(_Writer);

var _Reader = require('../../core/Reader');

var _Reader2 = _interopRequireDefault(_Reader);

var _Util = require('../../core/Util');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function getNecessaryBytesNum(value) {
  if (value >= -128 && value < 128) {
    return 1;
  } else if (value >= -32768 && value < 32768) {
    return 2;
  } else if (value >= -8388608 && value < 8388608) {
    return 3;
  } else if (value >= -2147483648 && value < 2147483648) {
    return 4;
  } else if (value >= -549755813888 && value < 549755813888) {
    return 5;
  } else if (value >= -140737488355328 && value < 140737488355328) {
    return 6;
  } else if (value >= -4503599627370496 && value < 4503599627370496) {
    return 7;
  } else {
    (0, _Util.throwException)('Matroska.Element.serialize(' + value + '): largesize(>=2^53) is not supported.');
  }
}

var TypeInt = function (_Element) {
  (0, _inherits3.default)(TypeInt, _Element);

  function TypeInt() {
    var _Object$getPrototypeO;

    (0, _classCallCheck3.default)(this, TypeInt);

    for (var _len = arguments.length, params = Array(_len), _key = 0; _key < _len; _key++) {
      params[_key] = arguments[_key];
    }

    return (0, _possibleConstructorReturn3.default)(this, (_Object$getPrototypeO = (0, _getPrototypeOf2.default)(TypeInt)).call.apply(_Object$getPrototypeO, [this].concat(params)));
  }

  (0, _createClass3.default)(TypeInt, [{
    key: 'serialize',
    value: function serialize(buffer) {
      var offset = arguments.length <= 1 || arguments[1] === undefined ? 0 : arguments[1];

      var value = this.props.value;
      var size = getNecessaryBytesNum(value);

      var base = offset;

      (0, _get3.default)((0, _getPrototypeOf2.default)(TypeInt.prototype), 'setElementSize', this).call(this, size);

      base += (0, _get3.default)((0, _getPrototypeOf2.default)(TypeInt.prototype), 'serialize', this).call(this, buffer, base);
      base += _Writer2.default.writeNumber(value, buffer, base, size);

      return base - offset;
    }
  }], [{
    key: 'validate',
    value: function validate(context, props) {
      var maxSizeLength = context.maxSizeLength;
      if (maxSizeLength) {
        var bytesNum = getNecessaryBytesNum(props.value);
        var sizeLen = _Element3.default.getNecessaryBytesNumForSize(bytesNum);
        if (sizeLen > maxSizeLength) {
          (0, _Util.throwException)('Size field cannot exceed the EBMLMaxSizeLength(' + maxSizeLength + ')');
        }
      }
    }
  }, {
    key: 'parse',
    value: function parse(buffer) {
      var offset = arguments.length <= 1 || arguments[1] === undefined ? 0 : arguments[1];

      var base = offset,
          readBytesNum = void 0,
          props = void 0,
          value = void 0;

      var _Element$parse = _Element3.default.parse(buffer, base);

      var _Element$parse2 = (0, _slicedToArray3.default)(_Element$parse, 2);

      readBytesNum = _Element$parse2[0];
      props = _Element$parse2[1];

      base += readBytesNum;

      var _Reader$readNumber = _Reader2.default.readNumber(buffer, base, props.size, true);

      var _Reader$readNumber2 = (0, _slicedToArray3.default)(_Reader$readNumber, 2);

      readBytesNum = _Reader$readNumber2[0];
      value = _Reader$readNumber2[1];

      base += readBytesNum;

      props.value = value;

      return [base - offset, props];
    }
  }]);
  return TypeInt;
}(_Element3.default);

exports.default = TypeInt;