154     private BlockInputStream blockDecoder = null;  field in SeekableXZInputStream
820                 if (blockDecoder == null) {  in read()
826                 int ret = blockDecoder.read(buf, off, len);  in read()
834                     blockDecoder = null;  in read()
870         if (endReached || seekNeeded || blockDecoder == null)  in available()
873         return blockDecoder.available();  in available()
913             if (blockDecoder != null) {  in close()
914                 blockDecoder.close();  in close()
915                 blockDecoder = null;  in close()
1022             if (blockDecoder != null) {  in seek()
1023                 blockDecoder.close();  in seek()
1024                 blockDecoder = null;  in seek()
1066             if (blockDecoder.skip(skipAmount) != skipAmount)  in seek()
1131             if (blockDecoder != null) {
1132                 blockDecoder.close();
1133                 blockDecoder = null;
1136             blockDecoder = new BlockInputStream(