docs: public long skip(long numToSkip) throws IOException {
          // REVIEW
          // This is horribly inefficient, but it ensures that we
          // properly skip over bytes via the TarBuffer...
          //
          byte[] skipBuf = new byte[8 * 1024];
          long skip = numToSkip;
          while (skip > 0) {
              int realSkip = (int) (skip > skipBuf.length ? skipBuf.length : skip);
              int numRead = this.read(skipBuf, 0, realSkip);
              if (numRead == -1) {
                  break;
              }
              skip -= numRead;
          }
          return (numToSkip - skip);
      }