/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.command.file;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.URL;
import org.jnode.shell.AbstractCommand;
import org.jnode.shell.syntax.Argument;
import org.jnode.shell.syntax.FileArgument;
import org.jnode.shell.syntax.URLArgument;
import org.jnode.util.NumberUtils;
/**
* @author gvt
* @author crawley@jnode.org
*/
public class HexdumpCommand extends AbstractCommand {
private static final String help_file = "the file to print out";
private static final String help_url = "the url to print out";
private static final String help_super = "Print a hexadecimal dump of a given file (or URL)";
private static final String fmt_cant_open = "Cannot open %s: %s%n";
private static final String fmt_cant_open_url = "Cannot access URL %s: %s%n";
private final FileArgument argFile;
private final URLArgument argURL;
public HexdumpCommand() {
super(help_super);
argFile = new FileArgument("file", Argument.OPTIONAL | Argument.EXISTING, help_file);
argURL = new URLArgument("url", Argument.OPTIONAL | Argument.EXISTING, help_url);
registerArguments(argFile, argURL);
}
public static void main(String[] args) throws Exception {
new HexdumpCommand().execute(args);
}
public void execute() throws IOException {
boolean myInput = false;
InputStream is = null;
PrintWriter out = getOutput().getPrintWriter(false);
PrintWriter err = getError().getPrintWriter();
try {
// Set up the stream to be dumped.
File file = argFile.getValue();
if (argFile.isSet()) {
try {
is = new FileInputStream(file);
} catch (FileNotFoundException ex) {
err.format(fmt_cant_open, file, ex.getLocalizedMessage());
exit(1);
}
} else if (argURL.isSet()) {
URL url = argURL.getValue();
try {
is = url.openStream();
} catch (IOException ex) {
err.format(fmt_cant_open_url, url, ex.getLocalizedMessage());
exit(1);
}
} else {
is = getInput().getInputStream();
myInput = true;
}
// Now do the work
final int rowlen = 16;
int prt = 0;
int len;
final byte[] buf = new byte[1024];
StringBuilder sb = new StringBuilder();
while ((len = is.read(buf)) > 0) {
int left = len;
int ofs = 0;
//
while (left > 0) {
sb.setLength(0);
int sz = Math.min(rowlen, left);
sb.append(NumberUtils.hex(prt, 8)).append(" ");
for (int i = 0; i < rowlen; i++) {
if (ofs + i < len) {
sb.append(NumberUtils.hex(buf[ofs + i], 2));
} else {
sb.append(" ");
}
if ((i + 1) < rowlen) {
sb.append(' ');
}
if ((i + 1) == rowlen / 2) {
sb.append(' ');
}
}
sb.append(" |");
for (int i = 0; i < rowlen; i++) {
if (ofs + i < len) {
char c = (char) buf[ofs + i];
if ((c >= ' ') && (c < (char) 0x7f)) {
sb.append(c);
} else {
sb.append('.');
}
} else {
sb.append(' ');
}
}
sb.append('|');
left -= sz;
ofs += sz;
prt += sz;
out.println(sb.toString());
out.flush();
}
}
out.flush();
} finally {
if (is != null && myInput) {
try {
is.close();
} catch (IOException ex) {
/* ignore */
}
}
}
}
}