139 lines
3.9 KiB
Java
139 lines
3.9 KiB
Java
/**
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* Copyright (C) 2011 Whisper Systems
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.whispersystems.textsecure.internal.util;
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import java.io.IOException;
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/**
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* Utility for generating hex dumps.
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*/
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public class Hex {
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private final static int HEX_DIGITS_START = 10;
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private final static int ASCII_TEXT_START = HEX_DIGITS_START + (16*2 + (16/2));
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final static String EOL = System.getProperty("line.separator");
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private final static char[] HEX_DIGITS = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
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};
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public static String toString(byte[] bytes) {
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return toString(bytes, 0, bytes.length);
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}
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public static String toString(byte[] bytes, int offset, int length) {
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StringBuffer buf = new StringBuffer();
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for (int i = 0; i < length; i++) {
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appendHexChar(buf, bytes[offset + i]);
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buf.append(' ');
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}
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return buf.toString();
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}
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public static String toStringCondensed(byte[] bytes) {
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StringBuffer buf = new StringBuffer();
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for (int i=0;i<bytes.length;i++) {
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appendHexChar(buf, bytes[i]);
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}
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return buf.toString();
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}
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public static byte[] fromStringCondensed(String encoded) throws IOException {
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final char[] data = encoded.toCharArray();
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final int len = data.length;
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if ((len & 0x01) != 0) {
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throw new IOException("Odd number of characters.");
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}
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final byte[] out = new byte[len >> 1];
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// two characters form the hex value.
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for (int i = 0, j = 0; j < len; i++) {
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int f = Character.digit(data[j], 16) << 4;
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j++;
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f = f | Character.digit(data[j], 16);
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j++;
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out[i] = (byte) (f & 0xFF);
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}
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return out;
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}
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public static String dump(byte[] bytes) {
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return dump(bytes, 0, bytes.length);
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}
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public static String dump(byte[] bytes, int offset, int length) {
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StringBuffer buf = new StringBuffer();
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int lines = ((length - 1) / 16) + 1;
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int lineOffset;
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int lineLength;
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for (int i = 0; i < lines; i++) {
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lineOffset = (i * 16) + offset;
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lineLength = Math.min(16, (length - (i * 16)));
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appendDumpLine(buf, i, bytes, lineOffset, lineLength);
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buf.append(EOL);
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}
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return buf.toString();
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}
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private static void appendDumpLine(StringBuffer buf, int line, byte[] bytes, int lineOffset, int lineLength) {
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buf.append(HEX_DIGITS[(line >> 28) & 0xf]);
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buf.append(HEX_DIGITS[(line >> 24) & 0xf]);
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buf.append(HEX_DIGITS[(line >> 20) & 0xf]);
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buf.append(HEX_DIGITS[(line >> 16) & 0xf]);
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buf.append(HEX_DIGITS[(line >> 12) & 0xf]);
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buf.append(HEX_DIGITS[(line >> 8) & 0xf]);
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buf.append(HEX_DIGITS[(line >> 4) & 0xf]);
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buf.append(HEX_DIGITS[(line ) & 0xf]);
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buf.append(": ");
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for (int i = 0; i < 16; i++) {
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int idx = i + lineOffset;
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if (i < lineLength) {
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int b = bytes[idx];
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appendHexChar(buf, b);
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} else {
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buf.append(" ");
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}
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if ((i % 2) == 1) {
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buf.append(' ');
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}
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}
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for (int i = 0; i < 16 && i < lineLength; i++) {
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int idx = i + lineOffset;
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int b = bytes[idx];
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if (b >= 0x20 && b <= 0x7e) {
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buf.append((char)b);
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} else {
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buf.append('.');
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}
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}
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}
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private static void appendHexChar(StringBuffer buf, int b) {
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buf.append(HEX_DIGITS[(b >> 4) & 0xf]);
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buf.append(HEX_DIGITS[b & 0xf]);
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}
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}
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