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

This function works perfectly well in Java:

public static boolean isGZipped(File f) {   
    val raf = new RandomAccessFile(file, "r")
    return GZIPInputStream.GZIP_MAGIC == (raf.read() & 0xff | ((raf.read() << 8) & 0xff00))
}

In scala:

def isGZip(file:File): Boolean = {
   int gzip = 0
   RandomAccessFile raf = new RandomAccessFile(f, "r")
   gzip = raf.read() & 0xff | ((raf.read() << 8) & 0xff00)
   raf.close()
   return gzip == GZIPInputStream.GZIP_MAGIC
}