question: 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 ; }
target:  Reads next variable length block from input.