Read N Characters from Read4

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 is only 3 characters left in the file.

By using the read4 API, implement the function int read(char *buf, int n) that reads n characters from the file.

Note:
The read function will only be called once for each test case.

/* The read4 API is defined in the parent class Reader4.
      int read4(char[] buf); */

public class Solution extends Reader4 {
    /**
     * @param buf Destination buffer
     * @param n   Maximum number of characters to read
     * @return    The number of characters read
     */
    public int read(char[] buf, int n) {
        char[] temp = new char[4];
        int count = 0;
        while (count < n) {
            int currentCount = read4(temp);
            if (currentCount == 0) break;
            
            int index = 0;
            while (index < currentCount && count < n)
                buf[count++] = temp[index++];
        }
        return count;
    }
}