osd-contiki/tools/cooja/java/se/sics/cooja/util/StringUtils.java

172 lines
5.2 KiB
Java

/*
* Copyright (c) 2009, Swedish Institute of Computer Science. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer. 2. Redistributions in
* binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution. 3. Neither the name of the
* Institute nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: StringUtils.java,v 1.5 2010/02/25 22:36:08 joxe Exp $
*/
package se.sics.cooja.util;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
/**
* Some utility methods for generating hex dumps.
*
* @author Niclas Finne, Fredrik Osterlind
*/
public class StringUtils {
private static final char[] HEX = {
'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
};
private StringUtils() {
// Prevent instances of this class
}
public static String toHex(byte data) {
return "" + HEX[(data >> 4) & 0xf] + HEX[data & 0xf];
}
public static String toHex(byte[] data) {
char[] buf = new char[data.length * 2];
for (int i = 0, j = 0, n = data.length; i < n; i++, j += 2) {
buf[j] = HEX[(data[i] >> 4) & 0xf];
buf[j + 1] = HEX[data[i] & 0xf];
}
return new String(buf);
}
public static String toHex(byte[] data, int bytesPerGroup) {
StringBuilder sb = new StringBuilder();
for (int i = 0, n = data.length; i < n; i++) {
if ((i % bytesPerGroup) == 0 && i > 0) {
sb.append(' ');
}
sb.append(HEX[(data[i] >> 4) & 0xf]);
sb.append(HEX[data[i] & 0xf]);
}
return sb.toString();
}
public static String hexDump(byte[] data) {
return hexDump(data, 5, 4);
}
public static String hexDump(byte[] data, int groupsPerLine, int bytesPerGroup) {
if (bytesPerGroup <= 0) {
throw new IllegalArgumentException("0 bytes per group");
}
if (groupsPerLine <= 0) {
groupsPerLine = 1;
}
final int bytesPerLine = groupsPerLine * bytesPerGroup;
StringBuilder sb = new StringBuilder();
for (int j = 0; j < data.length; j += bytesPerLine) {
int n = data.length - j;
if (n > bytesPerLine) {
n = bytesPerLine;
}
for (int i = 0; i < bytesPerLine; i++) {
if ((i % bytesPerGroup) == 0 && i > 0) {
sb.append(' ');
}
if (i < n) {
sb.append(HEX[(data[j + i] >> 4) & 0xf]);
sb.append(HEX[data[j + i] & 0xf]);
} else {
sb.append(" ");
}
}
sb.append(" ");
for (int i = 0; i < n; i++) {
if (data[j + i] >= 32) {
sb.append((char)(data[j + i] & 0xff));
} else {
sb.append('.');
}
}
sb.append('\n');
}
return sb.toString();
}
public static String loadFromURL(URL url) {
if (url == null) {
return null;
}
try {
InputStreamReader reader = new InputStreamReader(url.openStream());
StringBuilder sb = new StringBuilder();
char[] buf = new char[4096];
int read;
while ((read = reader.read(buf)) > 0) {
sb.append(buf, 0, read);
};
reader.close();
return sb.toString();
} catch (IOException e) {
return null;
}
}
public static String loadFromFile(File scriptFile) {
if (scriptFile == null) {
return null;
}
try {
FileReader reader = new FileReader(scriptFile);
StringBuilder sb = new StringBuilder();
char[] buf = new char[4096];
int read;
while ((read = reader.read(buf)) > 0) {
sb.append(buf, 0, read);
};
reader.close();
return sb.toString();
} catch (IOException e) {
return null;
}
}
public static boolean saveToFile(File file, String text) {
try {
PrintWriter outStream = new PrintWriter(new FileWriter(file));
outStream.print(text);
outStream.close();
return true;
} catch (Exception ex) {
return false;
}
}
}