C#中byte与short、int、long互相转化

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转载最新推荐文章于 2026-03-11 05:26:37 发布 1.4w 阅读 AI 写同款· GEO 优化 ›

TCP协议中ARQ自动重传的三种实现方式对比（含SACK详解）本文深入解析TCP协议中ARQ自动重传的三种实现方式，包括停止-等待、回退N步和选择重传协议，特别详细介绍了SACK机制的工作原理和优势。通过对比分析各协议的效率、复杂度和适用场景，为网络通信中的可靠性传输提供了实用的选型指南。阅读详情

这个是转载别人的博客，转载地址：
http://www.cnblogs.com/pegasus923/archive/2010/10/08/1845866.html

public final static byte[] getBytes(short s, boolean asc) 
{
    byte[] buf = new byte[2];
    if (asc)
        for (int i = buf.length - 1; i >= 0; i--) 
        {
            buf[i] = (byte) (s & 0x00ff);
          s >>= 8;
        }
    else
        for (int i = 0; i < buf.length; i++) 
        {
            buf[i] = (byte) (s & 0x00ff);
          s >>= 8;
        }
    return buf;
}

public final static byte[] getBytes(int s, boolean asc) 
{
    byte[] buf = new byte[4];
    if (asc)
      for (int i = buf.length - 1; i >= 0; i--) 
      {
        buf[i] = (byte) (s & 0x000000ff);
        s >>= 8;
      }
    else
      for (int i = 0; i < buf.length; i++)
      {
        buf[i] = (byte) (s & 0x000000ff);
        s >>= 8;
      }
    return buf;
}

public final static byte[] getBytes(long s, boolean asc) 
{
    byte[] buf = new byte[8];
    if (asc)
      for (int i = buf.length - 1; i >= 0; i--) 
        {
        buf[i] = (byte) (s & 0x00000000000000ff);
        s >>= 8;
      }
    else
      for (int i = 0; i < buf.length; i++) 
        {
        buf[i] = (byte) (s & 0x00000000000000ff);
        s >>= 8;
      }
    return buf;
}

public final static short getShort(byte[] buf, boolean asc) 
{
    if (buf == null) 
    {
      throw new IllegalArgumentException("byte array is null!");
    }
    if (buf.length > 2) 
    {
      throw new IllegalArgumentException("byte array size > 2 !");
    }
    short r = 0;
    if (asc)
      for (int i = buf.length - 1; i >= 0; i--) 
        {
        r <<= 8;
        r |= (buf[i] & 0x00ff);
      }
    else
      for (int i = 0; i < buf.length; i++) 
        {
        r <<= 8;
        r |= (buf[i] & 0x00ff);
      }
    return r;
}

public final static int getInt(byte[] buf, boolean asc) 
{
    if (buf == null) 
    {
      throw new IllegalArgumentException("byte array is null!");
    }
    if (buf.length > 4) 
    {
      throw new IllegalArgumentException("byte array size > 4 !");
    }
    int r = 0;
    if (asc)
      for (int i = buf.length - 1; i >= 0; i--) 
        {
        r <<= 8;
        r |= (buf[i] & 0x000000ff);
      }
    else
      for (int i = 0; i < buf.length; i++) 
        {
        r <<= 8;
        r |= (buf[i] & 0x000000ff);
      }
    return r;
}

public final static long getLong(byte[] buf, boolean asc) 
{
    if (buf == null) 
    {
      throw new IllegalArgumentException("byte array is null!");
    }
    if (buf.length > 8) 
    {
      throw new IllegalArgumentException("byte array size > 8 !");
    }
    long r = 0;
    if (asc)
      for (int i = buf.length - 1; i >= 0; i--) 
        {
        r <<= 8;
        r |= (buf[i] & 0x00000000000000ff);
      }
    else
      for (int i = 0; i < buf.length; i++) 
        {
        r <<= 8;
        r |= (buf[i] & 0x00000000000000ff);
      }
    return r;
}