question: public static int toCodePoints ( char [ ] src , int srcOff , int srcLen , int [ ] dest , int destOff ) { if ( srcLen < 0 ) { throw new IllegalArgumentException ( "srcLen must be >= 0" ) ; } int codePointCount = 0 ; for ( int i = 0 ; i < srcLen ; ) { final int cp = Character . codePointAt ( src , srcOff + i , srcOff + srcLen ) ; final int charCount = Character . charCount ( cp ) ; dest [ destOff + codePointCount ++ ] = cp ; i += charCount ; } return codePointCount ; }
target:  Converts a sequence of Java characters to a sequence of unicode code points.