change gzipped detection

components/security_apps/waap/waap_clib/Waf2Util.cc

@@ -1912,6 +1912,14 @@ base64Decode(const string &input)
     return out;
 }
 
+bool
+isGzipped(const string &stream)
+{
+    if (stream.size() < 2) return false;
+    auto unsinged_stream = reinterpret_cast<const u_char *>(stream.data());
+    return unsinged_stream[0] == 0x1f && unsinged_stream[1] == 0x8b;
+}
+
 bool
 containsInvalidUtf8(const string &payload)
 {