package algs55; // section 5.5
import stdlib.*;
/* ***********************************************************************
 *  Compilation:  javac HexDump.java
 *  Execution:    java HexDump < file
 *  Dependencies: BinaryIn.java
 *  Data file:    http://introcs.cs.princeton.edu/stdlib/abra.txt
 *
 *  Reads in a binary file and writes out the bytes in hex, 16 per line.
 *
 *  % more abra.txt
 *  ABRACADABRA!
 *
 *  % java HexDump 16 < abra.txt
 *  41 42 52 41 43 41 44 41 42 52 41 21
 *  96 bits
 *
 *  % hexdump < abra.txt
 *
 *  % od -t x1 < abra.txt
 *  0000000 41 42 52 41 43 41 44 41 42 52 41 21
 *  0000014
 *
 *************************************************************************/

public class HexDump {
	private static BinaryIn binaryIn;

	public static void main(String[] args) {
		//binaryIn = new BinaryIn ("data/abra.txt");
		//binaryIn = new BinaryIn ("abra.bin");
		//binaryIn = new BinaryIn ("genomeTiny.bin");
		binaryIn = new BinaryIn ("4runsOut.bin");
		args = new String[] { "16" };

		int BYTES_PER_LINE = 16;
		if (args.length == 1) {
			BYTES_PER_LINE = Integer.parseInt(args[0]);
		}

		int i;
		for (i = 0; !binaryIn.isEmpty(); i++) {
			if (BYTES_PER_LINE == 0) { binaryIn.readChar(); continue; }
			if (i == 0) StdOut.format("");
			else if (i % BYTES_PER_LINE == 0) StdOut.format("\n", i);
			else StdOut.print(" ");
			char c = binaryIn.readChar();
			StdOut.format("%02x", c & 0xff);
		}
		if (BYTES_PER_LINE != 0) StdOut.println();
		StdOut.println((i*8) + " bits");
	}
}