question: protected int read ( InputStream inputStream , byte [ ] buffer , char [ ] divider ) throws IOException { int index = 0 ; int dividerIndex = 0 ; do { byte readByte = ( byte ) ( 0x000000FF & inputStream . read ( ) ) ; if ( readByte == - 1 ) { return index ; } if ( readByte == divider [ dividerIndex ] ) { dividerIndex ++ ; } if ( dividerIndex == divider . length ) { index -= dividerIndex - 1 ; for ( int i = index ; i < index + dividerIndex ; i ++ ) { if ( i >= buffer . length ) { break ; } buffer [ i ] = 0 ; } return index ; } buffer [ index ] = readByte ; index ++ ; } while ( index < buffer . length ) ; return index ; }
target:  Reads bytes from a given file reader until either a specified character sequence is read, the buffer is completely filled or the end of file is reached.