Mega Code Archive
Java Hex dump Library
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/*
* Java Hexdump Library Copyright (c) Matthew Johnson 2005 This program 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,
* version 2 only. This program 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 program; if not, write
* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA. To Contact the author, please email
* src@matthew.ath.cx
*/
//package cx.ath.matthew.utils;
import java.io.PrintStream;
public class Hexdump {
public static final char[] hexchars = new char[] { '0', '1', '2', '3', '4',
'5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
public static String format(byte[] buf) {
return format(buf, 80);
}
public static String format(byte[] buf, int width) {
int bs = (width - 8) / 4;
int i = 0;
StringBuffer sb = new StringBuffer();
do {
for (int j = 0; j < 6; j++) {
sb.append(hexchars[(i << (j * 4) & 0xF00000) >> 20]);
}
sb.append('\t');
sb.append(toHex(buf, i, bs));
sb.append(' ');
sb.append(toAscii(buf, i, bs));
sb.append('\n');
i += bs;
} while (i < buf.length);
return sb.toString();
}
public static void print(byte[] buf) {
print(buf, System.err);
}
public static void print(byte[] buf, int width) {
print(buf, width, System.err);
}
public static void print(byte[] buf, int width, PrintStream out) {
out.print(format(buf, width));
}
public static void print(byte[] buf, PrintStream out) {
out.print(format(buf));
}
public static String toAscii(byte[] buf) {
return toAscii(buf, 0, buf.length);
}
public static String toAscii(byte[] buf, int ofs, int len) {
StringBuffer sb = new StringBuffer();
int j = ofs + len;
for (int i = ofs; i < j; i++) {
if (i < buf.length) {
if ((20 <= buf[i]) && (126 >= buf[i])) {
sb.append((char) buf[i]);
} else {
sb.append('.');
}
} else {
sb.append(' ');
}
}
return sb.toString();
}
/**
* Returns a string which can be written to a Java source file as part of a
* static initializer for a byte array. Returns data in the format 0xAB,
* 0xCD, .... use like: javafile.print("byte[] data = {")
* javafile.print(Hexdump.toByteArray(data)); javafile.println("};");
*/
public static String toByteArray(byte[] buf) {
return toByteArray(buf, 0, buf.length);
}
/**
* Returns a string which can be written to a Java source file as part of a
* static initializer for a byte array. Returns data in the format 0xAB,
* 0xCD, .... use like: javafile.print("byte[] data = {")
* javafile.print(Hexdump.toByteArray(data)); javafile.println("};");
*/
public static String toByteArray(byte[] buf, int ofs, int len) {
StringBuffer sb = new StringBuffer();
for (int i = ofs; (i < len) && (i < buf.length); i++) {
sb.append('0');
sb.append('x');
sb.append(hexchars[(buf[i] & 0xF0) >> 4]);
sb.append(hexchars[buf[i] & 0x0F]);
if (((i + 1) < len) && ((i + 1) < buf.length)) {
sb.append(',');
}
}
return sb.toString();
}
public static String toHex(byte[] buf) {
return toHex(buf, 0, buf.length);
}
public static String toHex(byte[] buf, int ofs, int len) {
StringBuffer sb = new StringBuffer();
int j = ofs + len;
for (int i = ofs; i < j; i++) {
if (i < buf.length) {
sb.append(hexchars[(buf[i] & 0xF0) >> 4]);
sb.append(hexchars[buf[i] & 0x0F]);
sb.append(' ');
} else {
sb.append(' ');
sb.append(' ');
sb.append(' ');
}
}
return sb.toString();
}
}
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