HarmonyOS 预置包解压

如果是在resources/rawfile，通过getRawFd拷贝文件，请参考：

/**
 * 通过fd来进行拷贝，避免文件过大的内存占用问题
 * data.fd是hap包的fd，data.offset表示目标文件在hap包中的偏移，data.length表示目标文件的长度
 */
this.context.resourceManager.getRawFd("tool.zip", (err, data) => {
  if (err != null) {
    console.error(err.message)
    return
  }
  let sanboxPath = this.context.filesDir
  console.log("沙箱路径：" + sanboxPath)
  let tmpPath = fs.mkdtempSync(sanboxPath + "/XXXXXX")
  let filePath = this.context.tempDir + "/tmp.zip"
  console.log("压缩文件路径：" + filePath)
  let dest = fs.openSync(filePath, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE)
  let bufsize = 4096
  let buf = new ArrayBuffer(bufsize)
  let off = 0, len = 0, readedLen = 0
  /**
   * 通过buffer将rawfile文件内容copy到沙箱路径
   */
  while (len = fs.readSync(data.fd, buf, { offset: data.offset + off, length: bufsize })) {
    readedLen += len
    fs.writeSync(dest.fd, buf, { offset: off, length: len })
    off = off + len
    if ((data.length - readedLen) < bufsize) {
      bufsize = data.length - readedLen
    }
  }
  fs.close(dest.fd)
  // 对沙箱路径下的压缩文件进行解压
  zlib.decompressFile(filePath, sanboxPath, {}, (err, data) => {
    if (err != null) {
      console.error(err.message)
    } else {
      console.log("decompress succeed")
    }
  })
  this.context.resourceManager.closeRawFd("tool.zip", (err, data) => {
    if (err != null) {
      console.log(err.message)
    } else {
      console.log("close success")
    }
  })