How to use the adm-zip/util/index.js.crc32 function in adm-zip

setData: function(value) {
                    uncompressedData = Utils.toBuffer(value);
                    if (!_isDirectory && uncompressedData.length) {
                        _entryHeader.size = uncompressedData.length;
                        _entryHeader.method = Utils.Constants.DEFLATED;
                        _entryHeader.crc = Utils.crc32(value);
                    } else {
                        _entryHeader.method = Utils.Constants.STORED;
                    }
                },
                getData: function() {

function crc32OK(data) {
                if (_entryHeader.flags & 8 != 8) {
                    if (Utils.crc32(data) != _entryHeader.crc) {
                        return false;
                    }
                } else {}
                return true;
            }
            function decompress(async, callback) {