Reads Binary File and Writes Hex

HexDump.java

public class HexDump
{
    private HexDump() { }

    public static void main( String[] args )
    {
        int bytesPerLine = 16;

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

        int i;

        for ( i = 0; !BinaryStdIn.isEmpty(); i++ )
        {
            if ( bytesPerLine == 0 )
            {
                BinaryStdIn.readChar();
                continue;
            }

            if ( i == 0 ) StdOut.printf( "" );
            else if ( i % bytesPerLine == 0 ) StdOut.printf( "\n", i );
            else StdOut.print( " " );
            char c = BinaryStdIn.readChar();
            StdOut.printf( "%02x", c & 0xff );
        }
        
        if ( bytesPerLine != 0 ) StdOut.println();
        StdOut.println( ( i*8 ) + " bits" );
    }
}