Read N Characters Given Read4 @LeetCode

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); */
	// Implement readline using read 4k
	public class Read4KI {
	//public class Read4KI 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[] buffer = new char[4];
	boolean eof = true;
	int total = 0;
	while (eof && total < n) {
	int temp = read4(buffer);
	if (temp < 4) {
	eof = false;
	}
	int bytes = Math.min(n - total, temp);
	System.arraycopy(buffer, 0, buf, total, bytes);
	total += bytes;
	}
	return total;
	}
	// API funciton
	public int read4(char[] buf) {
	return 0;
	}
	}

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