node.js - Nodejs 从 base64 写入 zip 文件

Question

我正在将 base64 编码值写入 zip 文件。以下是我用于编写的代码:

var base64Data  =   base64_encoded_value;
base64Data  +=  base64Data.replace('+', ' ');
binaryData  =   new Buffer(base64Data, 'base64').toString('binary');

fs.writeFile('test.zip', binaryData, "binary", function (err) {
    console.log(err); // writes out file without error
});

它的工作和 test.zip 文件正在创建，问题是当我提取它时，它给了我以下错误:

End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
unzip:  cannot find zipfile directory in one of /home/user/Node/project/public/media/written/zip4045508057.zip or
        /home/user/Node/project/public/media/written/zip4045508057.zip.zip, and cannot find /home/user/Node/project/public/media/written/zip4045508057.zip.ZIP, period.

有什么办法吗？？？

Answer 1

您必须将 base64 转换为 utf8 格式。然后您可以使用转换后的数据写入文件。

尝试使用以下函数将 base64 字符串转换为 utf8

/**
 * @param b64string {String}
 * @returns {Buffer}
 */
function _decodeBase64ToUtf8(b64string) {
    var buffer;
    if (typeof Buffer.from === "function") {
        // Node 5.10+
        buffer = Buffer.from(b64string, 'base64');
    } else {
        // older Node versions
        buffer = new Buffer(b64string, 'base64');
    }

    return buffer;
}

我已经用它创建了使用 base64 数据的 ZIP 文件