HarmonyOS ZIP压缩问题

官方zip.compress示例代码：

let arrayBufferOut = new ArrayBuffer(100);
let zip = zlib.createZipSync();
zip.compress(arrayBufferOut, arrayBufferOut, 20).then((data) => {
  console.info('compress success:');
}).catch((errData: BusinessError) => {
  console.error(`errData is errCode:${errData.code}  message:${errData.message}`);
})
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其中let arrayBufferOut = new ArrayBuffer(100)；100是压缩后的容器大小，在压缩buffer前，如何知道压缩后的buffer的大小？