kopia lustrzana https://github.com/ryukoposting/Signal-Android
242 wiersze
7.1 KiB
Java
242 wiersze
7.1 KiB
Java
/**
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* Copyright (C) 2014 Open 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.libaxolotl.util;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.text.ParseException;
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public class ByteUtil {
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public static byte[] combine(byte[]... elements) {
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try {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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for (byte[] element : elements) {
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baos.write(element);
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}
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return baos.toByteArray();
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} catch (IOException e) {
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throw new AssertionError(e);
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}
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}
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public static byte[][] split(byte[] input, int firstLength, int secondLength) {
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byte[][] parts = new byte[2][];
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parts[0] = new byte[firstLength];
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System.arraycopy(input, 0, parts[0], 0, firstLength);
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parts[1] = new byte[secondLength];
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System.arraycopy(input, firstLength, parts[1], 0, secondLength);
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return parts;
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}
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public static byte[][] split(byte[] input, int firstLength, int secondLength, int thirdLength)
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throws ParseException
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{
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if (input == null || firstLength < 0 || secondLength < 0 || thirdLength < 0 ||
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input.length < firstLength + secondLength + thirdLength)
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{
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throw new ParseException("Input too small: " + (input == null ? null : Hex.toString(input)), 0);
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}
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byte[][] parts = new byte[3][];
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parts[0] = new byte[firstLength];
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System.arraycopy(input, 0, parts[0], 0, firstLength);
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parts[1] = new byte[secondLength];
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System.arraycopy(input, firstLength, parts[1], 0, secondLength);
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parts[2] = new byte[thirdLength];
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System.arraycopy(input, firstLength + secondLength, parts[2], 0, thirdLength);
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return parts;
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}
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public static byte[] trim(byte[] input, int length) {
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byte[] result = new byte[length];
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System.arraycopy(input, 0, result, 0, result.length);
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return result;
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}
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public static byte intsToByteHighAndLow(int highValue, int lowValue) {
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return (byte)((highValue << 4 | lowValue) & 0xFF);
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}
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public static int highBitsToInt(byte value) {
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return (value & 0xFF) >> 4;
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}
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public static int lowBitsToInt(byte value) {
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return (value & 0xF);
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}
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public static int highBitsToMedium(int value) {
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return (value >> 12);
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}
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public static int lowBitsToMedium(int value) {
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return (value & 0xFFF);
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}
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public static byte[] shortToByteArray(int value) {
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byte[] bytes = new byte[2];
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shortToByteArray(bytes, 0, value);
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return bytes;
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}
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public static int shortToByteArray(byte[] bytes, int offset, int value) {
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bytes[offset+1] = (byte)value;
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bytes[offset] = (byte)(value >> 8);
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return 2;
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}
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public static int shortToLittleEndianByteArray(byte[] bytes, int offset, int value) {
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bytes[offset] = (byte)value;
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bytes[offset+1] = (byte)(value >> 8);
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return 2;
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}
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public static byte[] mediumToByteArray(int value) {
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byte[] bytes = new byte[3];
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mediumToByteArray(bytes, 0, value);
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return bytes;
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}
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public static int mediumToByteArray(byte[] bytes, int offset, int value) {
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bytes[offset + 2] = (byte)value;
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bytes[offset + 1] = (byte)(value >> 8);
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bytes[offset] = (byte)(value >> 16);
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return 3;
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}
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public static byte[] intToByteArray(int value) {
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byte[] bytes = new byte[4];
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intToByteArray(bytes, 0, value);
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return bytes;
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}
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public static int intToByteArray(byte[] bytes, int offset, int value) {
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bytes[offset + 3] = (byte)value;
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bytes[offset + 2] = (byte)(value >> 8);
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bytes[offset + 1] = (byte)(value >> 16);
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bytes[offset] = (byte)(value >> 24);
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return 4;
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}
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public static int intToLittleEndianByteArray(byte[] bytes, int offset, int value) {
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bytes[offset] = (byte)value;
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bytes[offset+1] = (byte)(value >> 8);
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bytes[offset+2] = (byte)(value >> 16);
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bytes[offset+3] = (byte)(value >> 24);
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return 4;
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}
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public static byte[] longToByteArray(long l) {
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byte[] bytes = new byte[8];
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longToByteArray(bytes, 0, l);
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return bytes;
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}
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public static int longToByteArray(byte[] bytes, int offset, long value) {
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bytes[offset + 7] = (byte)value;
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bytes[offset + 6] = (byte)(value >> 8);
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bytes[offset + 5] = (byte)(value >> 16);
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bytes[offset + 4] = (byte)(value >> 24);
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bytes[offset + 3] = (byte)(value >> 32);
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bytes[offset + 2] = (byte)(value >> 40);
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bytes[offset + 1] = (byte)(value >> 48);
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bytes[offset] = (byte)(value >> 56);
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return 8;
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}
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public static int longTo4ByteArray(byte[] bytes, int offset, long value) {
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bytes[offset + 3] = (byte)value;
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bytes[offset + 2] = (byte)(value >> 8);
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bytes[offset + 1] = (byte)(value >> 16);
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bytes[offset + 0] = (byte)(value >> 24);
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return 4;
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}
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public static int byteArrayToShort(byte[] bytes) {
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return byteArrayToShort(bytes, 0);
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}
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public static int byteArrayToShort(byte[] bytes, int offset) {
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return
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(bytes[offset] & 0xff) << 8 | (bytes[offset + 1] & 0xff);
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}
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// The SSL patented 3-byte Value.
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public static int byteArrayToMedium(byte[] bytes, int offset) {
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return
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(bytes[offset] & 0xff) << 16 |
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(bytes[offset + 1] & 0xff) << 8 |
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(bytes[offset + 2] & 0xff);
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}
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public static int byteArrayToInt(byte[] bytes) {
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return byteArrayToInt(bytes, 0);
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}
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public static int byteArrayToInt(byte[] bytes, int offset) {
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return
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(bytes[offset] & 0xff) << 24 |
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(bytes[offset + 1] & 0xff) << 16 |
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(bytes[offset + 2] & 0xff) << 8 |
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(bytes[offset + 3] & 0xff);
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}
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public static int byteArrayToIntLittleEndian(byte[] bytes, int offset) {
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return
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(bytes[offset + 3] & 0xff) << 24 |
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(bytes[offset + 2] & 0xff) << 16 |
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(bytes[offset + 1] & 0xff) << 8 |
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(bytes[offset] & 0xff);
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}
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public static long byteArrayToLong(byte[] bytes) {
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return byteArrayToLong(bytes, 0);
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}
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public static long byteArray4ToLong(byte[] bytes, int offset) {
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return
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((bytes[offset + 0] & 0xffL) << 24) |
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((bytes[offset + 1] & 0xffL) << 16) |
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((bytes[offset + 2] & 0xffL) << 8) |
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((bytes[offset + 3] & 0xffL));
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}
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public static long byteArrayToLong(byte[] bytes, int offset) {
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return
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((bytes[offset] & 0xffL) << 56) |
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((bytes[offset + 1] & 0xffL) << 48) |
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((bytes[offset + 2] & 0xffL) << 40) |
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((bytes[offset + 3] & 0xffL) << 32) |
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((bytes[offset + 4] & 0xffL) << 24) |
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((bytes[offset + 5] & 0xffL) << 16) |
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((bytes[offset + 6] & 0xffL) << 8) |
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((bytes[offset + 7] & 0xffL));
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}
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}
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