/**
* Reads a sequence of bits from standard input (that are encoded
* using run-length encoding with 8-bit run lengths); decodes them;
* and writes the results to standard output.
*/
public static void expand() {
boolean b = false;
while (!BinaryStdIn.isEmpty()) {
int run = BinaryStdIn.readInt(LG_R);
for (int i = 0; i < run; i++)
BinaryStdOut.write(b);
b = !b;
}
BinaryStdOut.close();
}
/**
* Reads in a sequence of bytes from standard input and draws
* them to standard drawing output as a width-by-height picture,
* using black for 1 and white for 0 (and red for any leftover
* pixels).
*
* @param args the command-line arguments
*/
public static void main(String[] args) {
int width = Integer.parseInt(args[0]);
int height = Integer.parseInt(args[1]);
Picture picture = new Picture(width, height);
for (int row = 0; row < height; row++) {
for (int col = 0; col < width; col++) {
if (!BinaryStdIn.isEmpty()) {
boolean bit = BinaryStdIn.readBoolean();
if (bit) picture.set(col, row, Color.BLACK);
else picture.set(col, row, Color.WHITE);
}
else {
picture.set(col, row, Color.RED);
}
}
}
picture.show();
}
/**
* Reads in a sequence of bytes from standard input and writes
* them to standard output in binary, k bits per line,
* where k is given as a command-line integer (defaults
* to 16 if no integer is specified); also writes the number
* of bits.
*
* @param args the command-line arguments
*/
public static void main(String[] args) {
int bitsPerLine = 16;
if (args.length == 1) {
bitsPerLine = Integer.parseInt(args[0]);
}
int count;
for (count = 0; !BinaryStdIn.isEmpty(); count++) {
if (bitsPerLine == 0) {
BinaryStdIn.readBoolean();
continue;
}
else if (count != 0 && count % bitsPerLine == 0) StdOut.println();
if (BinaryStdIn.readBoolean()) StdOut.print(1);
else StdOut.print(0);
}
if (bitsPerLine != 0) StdOut.println();
StdOut.println(count + " bits");
}
/**
* Reads in a sequence of bytes from standard input and writes
* them to standard output using hexademical notation, k hex digits
* per line, where k is given as a command-line integer (defaults
* to 16 if no integer is specified); also writes the number
* of bits.
*
* @param args the command-line arguments
*/
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");
}
/**
* Reads a sequence of bits from standard input; compresses
* them using run-length coding with 8-bit run lengths; and writes the
* results to standard output.
*/
public static void compress() {
char run = 0;
boolean old = false;
while (!BinaryStdIn.isEmpty()) {
boolean b = BinaryStdIn.readBoolean();
if (b != old) {
BinaryStdOut.write(run, LG_R);
run = 1;
old = !old;
}
else {
if (run == R-1) {
BinaryStdOut.write(run, LG_R);
run = 0;
BinaryStdOut.write(run, LG_R);
}
run++;
}
}
BinaryStdOut.write(run, LG_R);
BinaryStdOut.close();
}
