net: Keep TMessage to 32 bits (no real enforcement yet)

Author: pcanal

net/net/src/TMessage.cxx

@@ -392,10 +392,16 @@ Int_t TMessage::Compress()
    fCompPos    = fBufCur;
 
    bufcur = fBufComp;
+   if (CompLength() > static_cast<Int_t>(std::numeric_limits<UInt_t>::max())) {
+      Warning("Compress", "Compressed buffer length too large (%d)", CompLength());
+   }
    tobuf(bufcur, (UInt_t)(CompLength() - sizeof(UInt_t)));
    Int_t what = fWhat | kMESS_ZIP;
    tobuf(bufcur, what);
-   tobuf(bufcur, Length());    // original uncompressed buffer length
+   if (Length() > static_cast<Int_t>(std::numeric_limits<UInt_t>::max())) {
+      Warning("Compress", "Original buffer length too large (%lld)", Length());
+   }
+   tobuf(bufcur, (UInt_t)Length());    // original uncompressed buffer length
 
    return 0;
 }