Read N characters Given Read4 ii-call multiple times

The API: int read4(char *buf) reads 4 characters at a time from a file.

The return value is the actual number of characters read. For example, it returns 3 if there are only 3 characters left in the file.

read4by using the API, implement the function that int read(char *buf, int n) reads n characters from the file.

Note:
The read function may be called multiple times.

1 /*The read4 API is defined in the parent class Reader4.2 int read4 (char[] buf);*/3 4  Public classSolutionextendsReader4 {5     /**6      * @parambuf Destination Buffer7      * @paramN Maximum number of characters to read8      * @returnThe number of characters read9      */Ten     Private Char[] tmp =New Char[4]; One     Private intTmppoint;//indicate which position we should start reading A     Private intTmpcontain;//indicate how many char in the TMP buff -      Public intReadChar[] buf,intN) { -         intCur = 0; the          while(Cur <N) { -             if(Tmppoint = = 0){ -Tmpcontain =READ4 (TMP); -             } +             if(Tmpcontain = = 0){ -                 returncur; +             } A              while(cur < n && Tmppoint <Tmpcontain) { atBuf[cur + +] = Tmp[tmppoint + +]; -             } -Tmppoint = tmppoint%Tmpcontain; -         } -         returncur; -     } in}

Read N characters Given Read4 ii-call multiple times