unzipper-esm/dist/Open/unzip.js

Unzip cross-platform streaming API

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = unzip;
var _stream = require("stream");
var _zlib = _interopRequireDefault(require("zlib"));
var _Decrypt = _interopRequireDefault(require("../Decrypt.js"));
var _PullStream = _interopRequireDefault(require("../PullStream.js"));
var _parseExtraField = _interopRequireDefault(require("../parseExtraField.js"));
var _parseDateTime = _interopRequireDefault(require("../parseDateTime.js"));
var _parseBuffer = _interopRequireDefault(require("../parseBuffer.js"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { "default": e }; }
// 'node:stream'
// 'node:zlib'

function unzip(source, offset, _password, directoryVars, length) {
  var file = new _PullStream["default"](),
    entry = new _stream.PassThrough();
  var req = source.stream(offset, length);
  req.pipe(file).on('error', function (e) {
    entry.emit('error', e);
  });
  entry.vars = file.pull(30).then(function (data) {
    var vars = (0, _parseBuffer["default"])(data, [['signature', 4], ['versionsNeededToExtract', 2], ['flags', 2], ['compressionMethod', 2], ['lastModifiedTime', 2], ['lastModifiedDate', 2], ['crc32', 4], ['compressedSize', 4], ['uncompressedSize', 4], ['fileNameLength', 2], ['extraFieldLength', 2]]);
    vars.lastModifiedDateTime = (0, _parseDateTime["default"])(vars.lastModifiedDate, vars.lastModifiedTime);
    return file.pull(vars.fileNameLength).then(function (fileName) {
      vars.fileName = fileName.toString('utf8');
      return file.pull(vars.extraFieldLength);
    }).then(function (extraField) {
      var checkEncryption;
      vars.extra = (0, _parseExtraField["default"])(extraField, vars);
      // Ignore logal file header vars if the directory vars are available
      if (directoryVars && directoryVars.compressedSize) vars = directoryVars;
      if (vars.flags & 0x01) checkEncryption = file.pull(12).then(function (header) {
        if (!_password) throw new Error('MISSING_PASSWORD');
        var decrypt = new _Decrypt["default"]();
        String(_password).split('').forEach(function (d) {
          decrypt.update(d);
        });
        for (var i = 0; i < header.length; i++) header[i] = decrypt.decryptByte(header[i]);
        vars.decrypt = decrypt;
        vars.compressedSize -= 12;
        var check = vars.flags & 0x8 ? vars.lastModifiedTime >> 8 & 0xff : vars.crc32 >> 24 & 0xff;
        if (header[11] !== check) throw new Error('BAD_PASSWORD');
        return vars;
      });
      return Promise.resolve(checkEncryption).then(function () {
        entry.emit('vars', vars);
        return vars;
      });
    });
  });
  entry.vars.then(function (vars) {
    var fileSizeKnown = !(vars.flags & 0x08) || vars.compressedSize > 0;
    var eof;
    var inflater = vars.compressionMethod ? _zlib["default"].createInflateRaw() : new _stream.PassThrough();
    if (fileSizeKnown) {
      entry.size = vars.uncompressedSize;
      eof = vars.compressedSize;
    } else {
      eof = Buffer.alloc(4);
      eof.writeUInt32LE(0x08074b50, 0);
    }
    var stream = file.stream(eof);
    if (vars.decrypt) stream = stream.pipe(vars.decrypt.stream());
    stream.pipe(inflater).on('error', function (err) {
      entry.emit('error', err);
    }).pipe(entry).on('finish', function () {
      if (req.destroy) req.destroy();else if (req.abort) req.abort();else if (req.close) req.close();else if (req.push) req.push();else console.log('warning - unable to close stream');
    });
  })["catch"](function (e) {
    entry.emit('error', e);
  });
  return entry;
}
;
//# sourceMappingURL=unzip.js.map