FileDocCategorySizeDatePackage
Dumper.javaAPI DocExample3711Fri May 30 09:16:08 BST 2003com.darwinsys.io

Dumper

public class Dumper extends Object
Class to do formatted dump ("hex dump") of data from various sources. For example, the first few lines of running "java Dumper" with this class' class file as its argument might look like this: 
00016: ca fe ba be 00 00 00 2e 00 87 0a 00 29 00 3d 07 ???????.........
00032: 00 3e 08 00 3f 0a 00 02 00 40 09 00 0a 00 41 07 ..............A.
00048: 00 42 0a 00 06 00 3d 09 00 0a 00 43 09 00 0a 00 .B.........C....
00064: 44 07 00 45 0a 00 0a 00 3d 07 00 46 09 00 47 00 D..E.......F..G.
00080: 48 0a 00 0c 00 49 0a 00 0a 00 4a 07 00 4b 0a 00 H....I....J..K..
00096: 10 00 40 07 00 4c 09 00 47 00 4d 0a 00 4e 00 4f .....L..G.M..N.O
00112: 09 00 47 00 50 09 00 0a 00 51 0a 00 52 00 53 0a ..G.P....Q..R.S.
00128: 00 4e 00 54 08 00 55 0a 00 4e 00 56 0a 00 4e 00 .N.T..U..N.V..N.
00144: 57 0a 00 4e 00 58 0a 00 06 00 59 0a 00 06 00 5a W..N.X....Y....Z
00160: 0a 00 5b 00 5c 0a 00 06 00 5d 0a 00 5e 00 5f 0a ................
00176: 00 0a 00 60 0b 00 61 00 62 07 00 63 08 00 64 0a ......a.b..c..d.
00192: 00 24 00 65 0a 00 06 00 65 0a 00 4e 00 66 07 00 ...e....e..N.f..
00208: 67 01 00 0f 6f 66 66 73 65 74 46 6f 72 6d 61 74 g...offsetFormat
00224: 74 65 72 01 00 18 4c 6a 61 76 61 2f 74 65 78 74 ter...Ljava.text
00240: 2f 4e 75 6d 62 65 72 46 6f 72 6d 61 74 3b 01 00 .NumberFormat...
00256: 0e 42 59 54 45 53 5f 50 45 52 5f 4c 49 4e 45 01 .BYTES.PER.LINE.
00272: 00 01 49 01 00 0d 43 6f 6e 73 74 61 6e 74 56 61 ..I...ConstantVa
00288: 6c 75 65 03 00 00 00 10 01 00 03 6e 75 6d 01 00 lue........num..
00304: 18 4c 6a 61 76 61 2f 6c 61 6e 67 2f 53 74 72 69 .Ljava.lang.Stri
00320: 6e 67 42 75 66 66 65 72 3b 01 00 03 74 78 74 01 ngBuffer....txt.
author
Ian F. Darwin, http://www.darwinsys.com/contact.html
version
$Id: Dumper.java,v 1.14 2003/05/30 13:16:07 ian Exp $

Fields Summary
NumberFormat
offsetFormatter
A formatter for the offset
public static final int
BYTES_PER_LINE
The number of items per line
protected StringBuffer
num
protected StringBuffer
txt
private int
offset
Constructors Summary
Methods Summary
public voiddump(DumpGetter g)
print one file, given an open InputStream

		num.setLength(0);
		txt.setLength(0);

		offset = 0;
		
		try {
			int b = 0;
			int column = 0;

			while ((b=g.get()) != -1) {
				// XXX sleazebag formatting
				if (b < 16)
					num.append('0");
				num.append(Integer.toString(b, 16));
				num.append(' ");
				txt.append(Character.isLetterOrDigit((char)b) ? (char)b : '.");

				if (++column % BYTES_PER_LINE == 0) {
					endOfLine();
				}
			}
			// if partial line, output it.
			if (++column % BYTES_PER_LINE != 0) {
				endOfLine();
			}
			System.out.println();
		} catch (IOException ex) {
			System.out.println("Dumper: " + ex.toString());
		}
protected voidendOfLine()
Output the line's bytes and printables, send line end, and reset the two StringBuffers.


	              	 
	   
		System.out.print(offsetFormatter.format(offset += BYTES_PER_LINE));
		System.out.print(": ");
		System.out.print(num);
		System.out.print(' ");
		System.out.print(txt);
		System.out.println();
		num.setLength(0);
		txt.setLength(0);
public static voidmain(java.lang.String[] av)


	       
		Dumper c = new Dumper();
		switch(av.length) {
		case 0: c.dump(new StreamDumpGetter(System.in));
			break;
		default:
			for (int i=0; i<av.length; i++)
				try {
					c.dump(new StreamDumpGetter(new FileInputStream(av[i])));
				} catch (FileNotFoundException e) {
					System.err.println(e);
				}
		}