unzipper-esm/dist/parseBuffer.js

Unzip cross-platform streaming API

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = parse;
function _slicedToArray(r, e) { return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest(); }
function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _iterableToArrayLimit(r, l) { var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (null != t) { var e, n, i, u, a = [], f = !0, o = !1; try { if (i = (t = t.call(r)).next, 0 === l) { if (Object(t) !== t) return; f = !1; } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0); } catch (r) { o = !0, n = r; } finally { try { if (!f && null != t["return"] && (u = t["return"](), Object(u) !== u)) return; } finally { if (o) throw n; } } return a; } }
function _arrayWithHoles(r) { if (Array.isArray(r)) return r; }
function _createForOfIteratorHelper(r, e) { var t = "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (!t) { if (Array.isArray(r) || (t = _unsupportedIterableToArray(r)) || e && r && "number" == typeof r.length) { t && (r = t); var _n = 0, F = function F() {}; return { s: F, n: function n() { return _n >= r.length ? { done: !0 } : { done: !1, value: r[_n++] }; }, e: function e(r) { throw r; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var o, a = !0, u = !1; return { s: function s() { t = t.call(r); }, n: function n() { var r = t.next(); return a = r.done, r; }, e: function e(r) { u = !0, o = r; }, f: function f() { try { a || null == t["return"] || t["return"](); } finally { if (u) throw o; } } }; }
function _unsupportedIterableToArray(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } }
function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; }
/**
 * Parses sequential unsigned little endian numbers from the head of the passed buffer according to
 * the specified format passed.  If the buffer is not large enough to satisfy the full format,
 * null values will be assigned to the remaining keys.
 * @param {*} buffer The buffer to sequentially extract numbers from.
 * @param {*} format Expected format to follow when extrcting values from the buffer.  A list of list entries
 * with the following structure:
 * [
 *   [
 *     <key>,  // Name of the key to assign the extracted number to.
 *     <size>  // The size in bytes of the number to extract. possible values are 1, 2, 4, 8.
 *   ],
 *   ...
 * ]
 * @returns An object with keys set to their associated extracted values.
 */
function parse(buffer, format) {
  var result = {};
  var offset = 0;
  var _iterator = _createForOfIteratorHelper(format),
    _step;
  try {
    for (_iterator.s(); !(_step = _iterator.n()).done;) {
      var _step$value = _slicedToArray(_step.value, 2),
        key = _step$value[0],
        size = _step$value[1];
      if (buffer.length >= offset + size) {
        result[key] = parseUIntLE(buffer, offset, size);
      } else {
        result[key] = null;
      }
      offset += size;
    }
  } catch (err) {
    _iterator.e(err);
  } finally {
    _iterator.f();
  }
  return result;
}
function parseUIntLE(buffer, offset, size) {
  var result;
  switch (size) {
    case 1:
      result = buffer.readUInt8(offset);
      break;
    case 2:
      result = buffer.readUInt16LE(offset);
      break;
    case 4:
      result = buffer.readUInt32LE(offset);
      break;
    case 8:
      result = Number(buffer.readBigUInt64LE(offset));
      break;
    default:
      throw new Error('Unsupported UInt LE size!');
  }
  return result;
}
//# sourceMappingURL=parseBuffer.js.map