How to check if InputStream is Gzipped?

Question

Is there any way to check if InputStream has been gzipped? Here\'s the code:

public static InputStream decompressStream(InputStream input) {
    try {
               


        

Answer 1

Wrap the original stream in a BufferedInputStream, then wrap that in a GZipInputStream. Next try to extract a ZipEntry. If this works, it's a zip file. Then you can use "mark" and "reset" in the BufferedInputStream to return to the initial position in the stream, after your check.