question: @ Override public void write ( byte [ ] buf , int offset , int length , boolean isEnd ) throws IOException { while ( offset < length ) { TempBuffer tail = _tail ; if ( tail == null || tail . buffer ( ) . length <= tail . length ( ) ) { addBuffer ( TempBuffer . create ( ) ) ; tail = _tail ; } int tailLength = tail . length ( ) ; byte [ ] tailBuffer = tail . buffer ( ) ; int sublen = tailBuffer . length - tailLength ; if ( length - offset < sublen ) { sublen = length - offset ; } System . arraycopy ( buf , offset , tailBuffer , tailLength , sublen ) ; offset += sublen ; tail . length ( tailLength + sublen ) ; } }
target:  Writes a buffer to the underlying stream.