code: public static int getDecompressedLength(ByteBuffer src, int srcOff) {
      return (src.get(srcOff) & 0xFF) | (src.get(srcOff + 1) & 0xFF) << 8 | (src.get(srcOff + 2) & 0xFF) << 16 | src.get(srcOff + 3) << 24;
    }
docs: Returns the decompressed length of compressed data in <code>src[srcOff:]</code>.
  
  @param src the compressed data
  @param srcOff the start offset in src
  @return the decompressed length