InputStream to GZIPInputStream, and I need to know the size of the GZIPInputStream

I have a MultipartFile and I need to compress inputStream as gzip and sent it, but I need to find a way to compress it and know the compressed size of it

param: MultipartFile file

        try(var inputStream = file.getInputStream()) {

            var outputStream = new GZIPOutputStream(OutputStream.nullOutputStream());

            IOUtils.copyLarge(inputStream, outputStream);

           var compressedInputStream = someConvertMerthod(outputStream);


            sendCompressed(compressedInputStream, compressedSize)
        }

Maybe I can do something like this Java: How do I convert InputStream to GZIPInputStream? but I am not gonna be a able to get the compressedSize

I am not finding an easy way to do it :(

hey I think I found the solution :)

    param: MultipartFile file

            try (InputStream inputStream = file.getInputStream()) {

                ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
                GZIPOutputStream gzipOutputStream = new GZIPOutputStream(byteArrayOutputStream);

                inputStream.transferTo(gzipOutputStream);
                InputStream compressedInputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());

                byteArrayOutputStream.size() // is the compressed size      


            }

Thanks guys!