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package com.diozero.util;
/*
* #%L
* Organisation: diozero
* Project: diozero - Core
* Filename: Hex.java
*
* This file is part of the diozero project. More information about this project
* can be found at https://www.diozero.com/.
* %%
* Copyright (C) 2016 - 2021 diozero
* %%
* 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.
* #L%
*/
import java.io.PrintStream;
import java.nio.IntBuffer;
import java.util.concurrent.ThreadLocalRandom;
public class Hex {
private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
private static final char BUNDLE_SEP = ' ';
public static String encodeHexString(byte[] bytes) {
return encodeHexString(bytes, 0);
}
public static String encodeHexString(byte[] bytes, int bundleSize) {
char[] hexChars = new char[(bytes.length * 2) + (bundleSize > 0 ? (bytes.length / bundleSize) : 0)];
for (int j = 0, k = 1; j < bytes.length; j++, k++) {
int v = bytes[j] & 0xFF;
int start = (j * 2) + (bundleSize > 0 ? j / bundleSize : 0);
hexChars[start] = HEX_ARRAY[v >>> 4];
hexChars[start + 1] = HEX_ARRAY[v & 0x0F];
if (bundleSize > 0 && (k % bundleSize) == 0) {
hexChars[start + 2] = BUNDLE_SEP;
}
}
return new String(hexChars).trim();
}
public static byte[] decodeHex(CharSequence s) {
int len = s.length();
if ((len & 0x01) != 0) {
throw new IllegalArgumentException("Odd number of characters.");
}
byte[] out = new byte[len >> 1];
for (int i = 0, j = 0; j < len; i++) {
int f = (toDigit(s.charAt(j++)) << 4) | toDigit(s.charAt(j++));
out[i] = (byte) (f & 0xFF);
}
return out;
}
private static int toDigit(char ch) {
int digit = Character.digit(ch, 16);
if (digit == -1) {
throw new IllegalArgumentException("Invalid hex character '" + ch + "'");
}
return digit;
}
public static void dumpIntBuffer(IntBuffer buffer) {
dumpIntBuffer(buffer, 0, buffer.capacity());
}
public static void dumpIntBuffer(IntBuffer buffer, int start, int end) {
int ints_per_line = 8;
int lines = (end - 1) / ints_per_line + 1;
for (int i = 0; i < lines; i++) {
System.out.format("%04x: ", Integer.valueOf(start + i * ints_per_line));
for (int j = 0; j < ints_per_line && i * ints_per_line + j < end; j++) {
System.out.format("%08x ", Integer.valueOf(buffer.get(start + i * ints_per_line + j)));
}
System.out.println();
}
}
public static void dumpByteArray(byte[] bytes) {
dumpByteArray(bytes, System.out);
}
public static void dumpByteArray(byte[] bytes, PrintStream out) {
int bytes_per_line = 16;
String ascii = "";
int i;
for (i = 0; i < bytes.length; i++) {
if (i % bytes_per_line == 0) {
out.format("s%04x: ", Integer.valueOf(i));
}
System.out.format("%02x ", Byte.valueOf(bytes[i]));
ascii += (bytes[i] < ' ' || bytes[i] > 'z') ? '.' : (char) bytes[i];
if (i % bytes_per_line == bytes_per_line / 2 - 1) {
out.print(" ");
}
if (i % bytes_per_line == 15) {
out.println(" " + ascii);
ascii = "";
}
}
int last_line_bytes = i % bytes_per_line;
if (last_line_bytes != 0) {
for (int space = 0; space < (bytes_per_line - (last_line_bytes)) * 3; space++) {
out.print(' ');
}
if (last_line_bytes < bytes_per_line / 2) {
out.print(' ');
}
out.println(" " + ascii);
ascii = "";
}
}
public static void main(String[] args) {
byte[] bytes = { (byte) 0xde, (byte) 0xad, (byte) 0xbe, (byte) 0xef };
String s = encodeHexString(bytes);
System.out.println(s);
System.out.println(encodeHexString(bytes, 2));
System.out.println(encodeHexString(decodeHex(s)));
int num_ints = 35;
int[] ints = new int[num_ints];
ThreadLocalRandom rand = ThreadLocalRandom.current();
for (int i = 0; i < num_ints; i++) {
ints[i] = rand.nextInt();
}
dumpIntBuffer(IntBuffer.wrap(ints));
int num_bytes = 39;
bytes = new byte[num_bytes];
rand.nextBytes(bytes);
dumpByteArray(bytes);
System.out.println();
num_bytes = 40;
bytes = new byte[num_bytes];
rand.nextBytes(bytes);
dumpByteArray(bytes);
System.out.println();
num_bytes = 41;
bytes = new byte[num_bytes];
rand.nextBytes(bytes);
dumpByteArray(bytes);
System.out.println();
num_bytes = 31;
bytes = new byte[num_bytes];
rand.nextBytes(bytes);
dumpByteArray(bytes);
System.out.println();
num_bytes = 32;
bytes = new byte[num_bytes];
rand.nextBytes(bytes);
dumpByteArray(bytes);
System.out.println();
num_bytes = 33;
bytes = new byte[num_bytes];
rand.nextBytes(bytes);
dumpByteArray(bytes);
System.out.println();
}
}
