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RHQ Enterprise Agent-Server Communications Layer
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/*
* RHQ Management Platform
* Copyright (C) 2005-2008 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.rhq.enterprise.communications.util;
import java.io.File;
import java.io.FileInputStream;
/**
* Dumps hexadecimal, decimal, octal and binary representations of any given File, String or byte array. For example,
* the different representations for the string "helloworld" will show:
*
* Hexadecimal:
*
*
* 68 65 6c 6c 6f 77 6f 72 6c 64 helloworld
*
*
* Decimal:
*
*
* 104 101 108 108 111 119 111 114 hellowor
* 108 100 ld
*
*
* Octal:
*
*
* 150 145 154 154 157 167 hellow
* 157 162 154 144 orld
*
*
* Binary:
*
*
* 1101000 1100101 1101100 1101100 1101111 hello
* 1110111 1101111 1110010 1101100 1100100 world
*
*
* @author John Mazzitelli
*/
public class DumpBytes {
/**
* Hexadecimal base (16).
*/
public static final int BASE_HEX = 16;
/**
* Decimal base (10).
*/
public static final int BASE_DEC = 10;
/**
* Octal base (8).
*/
public static final int BASE_OCT = 8;
/**
* Binary base (2).
*/
public static final int BASE_BIN = 2;
/**
* Converts the given byte array to a numerical format representation.
*
* @param bytes data to be converted to a particular numerical format
* @param cols number of columns the output data will have
* @param format numerical base the output will be shown as - e.g. {@link #BASE_HEX} is hex
*
* @return formatted representation of the given byte array.
*
* @throws IllegalArgumentException if format is invalid
*/
public static String dumpData(byte[] bytes, int cols, int format) {
int num_col_width;
int char_col_width;
StringBuffer result = new StringBuffer(1024);
String nums = "";
String chars = "";
String byte_str;
if ((format < 2) || (format > 16)) {
throw new IllegalArgumentException("format=" + format);
} else if (format < 3) // leave enough room for 8 binary digits and a space
{
num_col_width = 9;
char_col_width = 1;
} else if (format < 8) {
num_col_width = 6;
char_col_width = 1;
} else if (format < 10) // leave enough room for 4 octal digits and a space
{
num_col_width = 5;
char_col_width = 1;
} else if (format < 16) // leave enough room for 3 decimal digits and a space
{
num_col_width = 4;
char_col_width = 1;
} else { // leave enough room for 2 hexadecimal digits and a space
num_col_width = 3;
char_col_width = 1;
}
for (int i = 0; i < bytes.length; i++) {
if (((i % cols) == 0) && (i != 0)) {
result.append(nums);
result.append(" ");
result.append(chars);
result.append('\n');
nums = "";
chars = "";
}
byte_str = Integer.toString(bytes[i] & 0x000000FF, format);
nums += padFront(byte_str, num_col_width);
chars += padFront(toCharString(bytes[i]), char_col_width);
}
result.append(padBack(nums, (cols * num_col_width)));
result.append(" ");
result.append(padBack(chars, (cols * char_col_width)));
result.append('\n');
return result.toString();
}
/**
* Converts the given String to a numerical format representation.
*
* @param data String to be converted to a particular numerical format
* @param cols number of columns the output data will have
* @param format numerical base the output will be shown as (e.g. 16 is hex)
*
* @return Formatted representation of the given String.
*/
public static String dumpData(String data, int cols, int format) {
return dumpData(data.getBytes(), cols, format);
}
/**
* Reads the given File and converts its contents to a numerical format representation.
*
* @param file File whose contents are to be converted to a particular numerical format
* @param cols number of columns the output data will have
* @param format numerical base the output will be shown as (e.g. 16 is hex)
*
* @return formatted representation of the given String or null if the file was not readable.
*/
public static String dumpData(File file, int cols, int format) {
FileInputStream fis;
byte[] file_contents;
int num_bytes;
try {
file_contents = new byte[(int) file.length()];
fis = new FileInputStream(file);
try {
num_bytes = fis.read(file_contents);
} finally {
fis.close();
}
if (num_bytes != file_contents.length) {
throw new IllegalStateException(num_bytes + "!=" + file_contents.length);
}
return dumpData(file_contents, cols, format);
} catch (Exception e) {
return null;
}
}
/**
* Converts the contents of the given File to binary format.
*
* @param f file whose contents is to be converted
*
* @return Formatted representation of the file contents
*/
public static String dumpBinData(File f) {
return dumpData(f, 7, BASE_BIN);
}
/**
* Converts the given byte array to binary format.
*
* @param data byte array to be converted
*
* @return Formatted representation of data
*/
public static String dumpBinData(byte[] data) {
return dumpData(data, 7, BASE_BIN);
}
/**
* Converts the given String to binary format.
*
* @param data String to be converted
*
* @return Formatted representation of data
*/
public static String dumpBinData(String data) {
return dumpData(data, 7, BASE_BIN);
}
/**
* Converts the contents of the given File to octal format.
*
* @param f file whose contents is to be converted
*
* @return Formatted representation of the file contents
*/
public static String dumpOctData(File f) {
return dumpData(f, 9, BASE_OCT);
}
/**
* Converts the given byte array to octal format.
*
* @param data byte array to be converted
*
* @return Formatted representation of data
*/
public static String dumpOctData(byte[] data) {
return dumpData(data, 9, BASE_OCT);
}
/**
* Converts the given String to octal format.
*
* @param data String to be converted
*
* @return Formatted representation of data
*/
public static String dumpOctData(String data) {
return dumpData(data, 9, BASE_OCT);
}
/**
* Converts the contents of the given File to decimal format.
*
* @param f file whose contents is to be converted
*
* @return Formatted representation of the file contents
*/
public static String dumpDecData(File f) {
return dumpData(f, 12, BASE_DEC);
}
/**
* Converts the given byte array to decimal format.
*
* @param data byte array to be converted
*
* @return Formatted representation of data
*/
public static String dumpDecData(byte[] data) {
return dumpData(data, 12, BASE_DEC);
}
/**
* Converts the given String to decimal format.
*
* @param data String to be converted
*
* @return Formatted representation of data
*/
public static String dumpDecData(String data) {
return dumpData(data, 12, BASE_DEC);
}
/**
* Converts the contents of the given File to hexadecimal format.
*
* @param f file whose contents is to be converted
*
* @return Formatted representation of the file contents
*/
public static String dumpHexData(File f) {
return dumpData(f, 15, BASE_HEX);
}
/**
* Converts the given byte array to hexadecimal format.
*
* @param data byte array to be converted
*
* @return Formatted representation of data
*/
public static String dumpHexData(byte[] data) {
return dumpData(data, 15, BASE_HEX);
}
/**
* Converts the given String to hexadecimal format.
*
* @param data String to be converted
*
* @return Formatted representation of data
*/
public static String dumpHexData(String data) {
return dumpData(data, 15, BASE_HEX);
}
/**
* Appends whitespace to the end of the given string.
*
* @param s string to append with whitespace
* @param len number of spaces to append
*
* @return appended string
*/
private static String padBack(String s, int len) {
String spaces = "";
for (int i = 0; i < (len - s.length()); i++) {
spaces += " ";
}
return (s + spaces);
}
/**
* Prepends whitespace to the given string.
*
* @param s string to prepend whitespace
* @param len number of spaces to prepend
*
* @return string with prepended whitespace
*/
private static String padFront(String s, int len) {
String spaces = "";
for (int i = 0; i < (len - s.length()); i++) {
spaces += " ";
}
return (spaces + s);
}
/**
* Returns a string representation of the given byte. Whitespace will be represented with a " " and control
* characters will be represented with a "." character.
*
* @param b byte to convert to a string
*
* @return string version of the given byte
*/
private static String toCharString(byte b) {
if (Character.isWhitespace((char) b)) {
return " ";
} else if (Character.isISOControl((char) b)) {
return ".";
}
return "" + (char) b;
}
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