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HexDump.java
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/
HexDump.java
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/*
* Copyright 2018 Bence Varga
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
* documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
* OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package org.czentral.incubator.streamm;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author bence
*/
public class HexDump {
public static void displayHex(byte[] buffer, int startOffset, int maxLength) {
System.out.println(prettyPrintHex(buffer, startOffset, maxLength));
}
public static String prettyPrintHex(byte[] buffer, int startOffset, int maxLength) {
final int LINE_LENGTH = 16;
char[] digits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
StringBuilder sb = new StringBuilder(4096);
int offset = startOffset;
while (offset < startOffset + maxLength) {
sb.append(String.format("%08X: ", offset));
int segmentLength = Math.min(LINE_LENGTH, startOffset + maxLength - offset);
for (int i = 0; i < segmentLength; i++) {
if (i > 0) {
sb.append(i % 4 == 0 ? '-' : ' ');
}
sb.append(digits[(buffer[offset + i] >> 4) & 0x0f]);
sb.append(digits[(buffer[offset + i]) & 0x0f]);
//String digit = new String("0" + Integer.toHexString(buffer[offset + i] & 0xff));
//s += " " + digit.substring(digit.length() - 2);
}
for (int i = 0; i < LINE_LENGTH - segmentLength + 1; i++) {
sb.append(" ");
}
for (int i = 0; i < segmentLength; i++) {
int num = buffer[offset + i] & 0xff;
sb.append(num > 13 ? (char) num : '.');
}
sb.append('\n');
offset += segmentLength;
}
return sb.toString();
}
}