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53 lines
1.5 KiB
Java
53 lines
1.5 KiB
Java
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import edu.princeton.cs.introcs.BinaryStdIn;
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import edu.princeton.cs.introcs.StdOut;
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/*************************************************************************
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* Compilation: javac HexDump.java
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* Execution: java HexDump < file
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* Dependencies: BinaryStdIn.java
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* Data file: http://introcs.cs.princeton.edu/stdlib/abra.txt
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*
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* Reads in a binary file and writes out the bytes in hex, 16 per line.
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*
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* % more abra.txt
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* ABRACADABRA!
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*
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* % java HexDump 16 < abra.txt
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* 41 42 52 41 43 41 44 41 42 52 41 21
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* 96 bits
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*
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*
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* Remark
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* --------------------------
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* - Similar to the Unix utilities od (octal dump) or hexdump (hexadecimal dump).
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*
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* % od -t x1 < abra.txt
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* 0000000 41 42 52 41 43 41 44 41 42 52 41 21
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* 0000014
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*
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*************************************************************************/
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public class HexDump {
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public static void main(String[] args) {
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int BYTES_PER_LINE = 16;
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if (args.length == 1) {
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BYTES_PER_LINE = Integer.parseInt(args[0]);
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}
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int i;
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for (i = 0; !BinaryStdIn.isEmpty(); i++) {
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if (BYTES_PER_LINE == 0) { BinaryStdIn.readChar(); continue; }
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if (i == 0) StdOut.printf("");
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else if (i % BYTES_PER_LINE == 0) StdOut.printf("\n", i);
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else StdOut.print(" ");
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char c = BinaryStdIn.readChar();
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StdOut.printf("%02x", c & 0xff);
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}
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if (BYTES_PER_LINE != 0) StdOut.println();
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StdOut.println((i*8) + " bits");
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}
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}
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