Here you can find the source of bytesToInt(final byte[] bytes, final int position, final int length, final int bitShiftStart, final int bitShitIncrement)
private static final int bytesToInt(final byte[] bytes, final int position, final int length, final int bitShiftStart, final int bitShitIncrement)
//package com.java2s; /*//from ww w .java 2 s . c om * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { private static final int bytesToInt(final byte[] bytes, final int position, final int length, final int bitShiftStart, final int bitShitIncrement) { if (length > 4) throw new IllegalArgumentException("The maximum capacity for an int is 32 bytes"); final int signum = bytes[position] < 0 ? -1 : 1; final int positiveNum = (int) bytesToUInt(bytes, position, length, bitShiftStart, bitShitIncrement); return signum * positiveNum; } private static final long bytesToUInt(final byte[] bytes, final int position, final int length, final int bitShiftStart, final int bitShitIncrement) { long num = 0; if (length > 4) throw new IllegalArgumentException("The maximum capacity for an int is 32 bytes"); for (int i = 0, bitShift = bitShiftStart; i < length; i++, bitShift += bitShitIncrement) { final long tempVal = bytes[position + i] & 0xff; num += tempVal << bitShift; } return num; } }