protected int readBlock(){
  blockSize=read();
  int n=0;
  if (blockSize > 0) {
    try {
      int count=0;
      while (n < blockSize) {
        count=in.read(block,n,blockSize - n);
        if (count == -1)         break;
        n+=count;
      }
    }
 catch (    IOException e) {
    }
    if (n < blockSize) {
      status=STATUS_FORMAT_ERROR;
    }
  }
  return n;
}

protected int readBlock ( ) { blockSize = read ( ) ; int n = 0 ; if ( blockSize > 0 ) { try { int count = 0 ; while ( n < blockSize ) { count = in . read ( block , n , blockSize - n ) ; if ( count == - 1 ) break ; n += count ; } } catch ( IOException e ) { } if ( n < blockSize ) { status = STATUS_FORMAT_ERROR ; } } return n ; }
reads next variable length block from input .
