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com.github.xingshuangs.iot.utils.IntegerUtil Maven / Gradle / Ivy
/*
* MIT License
*
* Copyright (c) 2021-2099 Oscura (xingshuang)
*
* 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 com.github.xingshuangs.iot.utils;
/**
* @author xingshuang
*/
public class IntegerUtil {
private IntegerUtil() {
// NOOP
}
/**
* 将short转换为字节数组
*
* @param data short数据
* @param littleEndian true:小端，false：大端
* @return 字节数组
*/
public static byte[] toByteArray(int data, boolean littleEndian) {
byte[] bytes = new byte[4];
if (littleEndian) {
bytes[0] = (byte) ((data) & 0xFF);
bytes[1] = (byte) ((data >> 8) & 0xFF);
bytes[2] = (byte) ((data >> 16) & 0xFF);
bytes[3] = (byte) ((data >> 24) & 0xFF);
} else {
bytes[0] = (byte) ((data >> 24) & 0xFF);
bytes[1] = (byte) ((data >> 16) & 0xFF);
bytes[2] = (byte) ((data >> 8) & 0xFF);
bytes[3] = (byte) ((data) & 0xFF);
}
return bytes;
}
/**
* 将int转换为字节数组，默认采用大端模式
*
* @param data int数据
* @return 字节数组
*/
public static byte[] toByteArray(int data) {
return toByteArray(data, false);
}
/**
* 将long转换为字节数组，默认采用大端模式
*
* @param data long数据
* @return 字节数组
*/
public static byte[] toByteArray(long data) {
return toByteArray((int) data, false);
}
/**
* 将long转换为字节数组，并自定义获取字节数，默认采用大端模式
*
* @param data long数据
* @param offset 偏移量
* @param length 读取长度
* @return 字节数组
*/
public static byte[] toCustomByteArray(long data, int offset, int length) {
return toCustomByteArray(data, offset, length, false);
}
/**
* 将long转换为字节数组，并自定义获取字节数，默认采用大端模式
*
* @param data long数据
* @param offset 偏移量
* @param length 读取长度
* @param littleEndian 小端模式
* @return 字节数组
*/
public static byte[] toCustomByteArray(long data, int offset, int length, boolean littleEndian) {
if (offset + length > 4) {
throw new IndexOutOfBoundsException("offset + length > 4");
}
byte[] bytes = toByteArray((int) data, littleEndian);
byte[] res = new byte[length];
System.arraycopy(bytes, offset, res, 0, length);
return res;
}
/**
* 将字节数组转换为int32
*
* @param data 字节数组
* @return int32数据
*/
public static int toInt32(byte[] data) {
return toInt32(data, 0, false);
}
/**
* 将字节数组转换为int32
*
* @param data 字节数组
* @param offset 偏移量
* @return int32数据
*/
public static int toInt32(byte[] data, int offset) {
return toInt32(data, offset, false);
}
/**
* 将字节数组转换为int32
*
* @param data 字节数组
* @param offset 偏移量
* @param littleEndian true：小端模式，false：大端模式
* @return int32数据
*/
public static int toInt32(byte[] data, int offset, boolean littleEndian) {
if (data.length < 4) {
throw new IndexOutOfBoundsException("data length < 4");
}
if (offset + 4 > data.length) {
throw new IndexOutOfBoundsException("offset + 4 > data length");
}
int b = littleEndian ? 3 : 0;
int d = littleEndian ? 1 : -1;
return (((data[offset + b - d * 0] & 0xFF) << 24)
| ((data[offset + b - d * 1] & 0xFF) << 16)
| ((data[offset + b - d * 2] & 0xFF) << 8)
| ((data[offset + b - d * 3] & 0xFF) << 0));
}
/**
* 将字节数组转换为int32
*
* @param data 字节数组
* @param offset 偏移量
* @return int32数据
*/
public static int toInt32In3Bytes(byte[] data, int offset) {
return toInt32In3Bytes(data, offset, false);
}
/**
* 将字节数组转换为int32
*
* @param data 字节数组
* @param offset 偏移量
* @param littleEndian true：小端模式，false：大端模式
* @return int32数据
*/
public static int toInt32In3Bytes(byte[] data, int offset, boolean littleEndian) {
if (data.length < 3) {
throw new IndexOutOfBoundsException("data length < 3");
}
if (offset + 3 > data.length) {
throw new IndexOutOfBoundsException("offset + 3 > data length");
}
int b = littleEndian ? 2 : 0;
int d = littleEndian ? 1 : -1;
return (((data[offset + b - d * 0] & 0xFF) << 16)
| ((data[offset + b - d * 1] & 0xFF) << 8)
| ((data[offset + b - d * 2] & 0xFF) << 0));
}
/**
* 将字节数组转换为uint32
*
* @param data 字节数组
* @return uint32数据
*/
public static long toUInt32(byte[] data) {
return toUInt32(data, 0, false);
}
/**
* 将字节数组转换为uint32
*
* @param data 字节数组
* @param offset 偏移量
* @return uint32数据
*/
public static long toUInt32(byte[] data, int offset) {
return toUInt32(data, offset, false);
}
/**
* 将字节数组转换为uint32
*
* @param data 字节数组
* @param offset 偏移量
* @param littleEndian true：小端模式，false：大端模式
* @return uint32数据
*/
public static long toUInt32(byte[] data, int offset, boolean littleEndian) {
if (data.length < 4) {
throw new IndexOutOfBoundsException("data length < 4");
}
if (offset + 4 > data.length) {
throw new IndexOutOfBoundsException("offset + 4 > data length");
}
int b = littleEndian ? 3 : 0;
int d = littleEndian ? 1 : -1;
return (((data[offset + b - d * 0] & 0xFF) << 24)
| ((data[offset + b - d * 1] & 0xFF) << 16)
| ((data[offset + b - d * 2] & 0xFF) << 8)
| ((data[offset + b - d * 3] & 0xFF) << 0)) & 0xFFFFFFFFL;
}
}
