C# crc32文件校验源码

[wo22ni]

C# crc32文件校验源码,有的共享下.谢谢...

[wuyq11]

CRC

[wo22ni]

你的博客左边的导航都把文字挡完了.看不到了.

[linjs137]

这个我编过有源代码 不过电脑暂时不在身边 lz不要偷懒 百度下校验原理半个小时内搞定

[3000sunqin]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MT.Common.Toolkit.ByteDomain
{
    /// <summary>
    /// 计算或验证各种通信帧校验的工具类
    /// </summary>
    public static class FrameCheckHelper
    {
        private static readonly byte[] AuchCRCHi = new byte[]//crc高位表
        {
            0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
            0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
            0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
            0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 
            0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
            0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 
            0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
            0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
            0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
            0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 
            0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
            0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 
            0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
            0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 
            0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
            0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 
            0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
            0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
            0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
            0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
            0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
            0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 
            0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
            0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
            0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
            0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
        };

        private static readonly byte[] AuchCRCLo = new byte[]//crc低位表
        {
            0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 
            0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 
            0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 
            0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 
            0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4, 
            0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3, 
            0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 
            0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 
            0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 
            0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 
            0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 
            0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26, 
            0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 
            0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 
            0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 
            0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 
            0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 
            0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5, 
            0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 
            0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 
            0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 
            0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 
            0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 
            0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C, 
            0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 
            0x43, 0x83, 0x41, 0x81, 0x80, 0x40
        };

        /// <summary>
        /// 计算CRC16校验值
        /// </summary>
        /// <param name="buffer">输入的字节数组</param>
        /// <param name="crcHI">返回CRC16高位</param>
        /// <param name="crcLO">返回CRC16低位</param>
        /// <returns>返回ushort类型的CRC16校验值</returns>
        public static byte[] CalculateCrc16(this byte[] buffer)
        {
            byte crcHI = 0xff;  // high crc byte initialized
            byte crcLO = 0xff;  // low crc byte initialized 
            if (buffer == null) throw new ArgumentNullException("buffer");
            for (int i = 0; i < buffer.Length ; i++)
            {
                int crcIndex = crcHI ^ buffer[i]; //查找crc表值
                crcHI = (byte)(crcLO ^ AuchCRCHi[crcIndex]);
                crcLO = AuchCRCLo[crcIndex];
            }
            return new byte[] { crcHI, crcLO };
        }

        /// <summary>
        /// 将CRC16校验值直接装配到传入的字节数组尾部
        /// </summary>
        /// <param name="buffer">传入的字节数组</param>
        /// <returns>装配了CRC16校验值后的字节数组</returns>
        /// <exception cref="System.ArgumentNullException">传入的字节数组为空</exception>
        /// <exception cref="System.ArgumentException">传入的字节数组长度小于等于0</exception>
        public static byte[] AssemblyFrameByCrc16(this byte[] buffer)
        {
            if (buffer == null) throw new ArgumentNullException("buffer");
            byte[] crcBytes = CalculateCrc16(buffer);
            return ByteArrayHelper.AppendByteArray(buffer, crcBytes);
        }

        /// <summary>
        /// 对传入的带CRC16校验的数据帧进行校验，数据帧的最后两位为CRC16校验字节
        /// </summary>
        /// <param name="frame">带CRC16校验的数据帧</param>
        /// <param name="buffer">返回不带CRC16校验的字节数组</param>
        /// <returns>true:数据正确 false:数据错误</returns>
        /// <exception cref="System.ArgumentNullException">传入的字节数组为空</exception>
        /// <exception cref="System.ArgumentException">传入的字节数组长度小于等于2</exception>
        public static bool ValidateFrameByCrc16(this byte[] frame, out byte[] buffer)
        {
            if (frame == null) throw new ArgumentNullException("frame");
            if (frame.Length <= 2) throw new ArgumentOutOfRangeException("frame","传入的字节数组长度必须大于2");
            byte[] tmpBuffer = ByteArrayHelper.SubByteArray(frame, 0, frame.Length - 2);
            byte[] crcBytes = CalculateCrc16(tmpBuffer);
            if (frame[frame.Length - 2] == crcBytes[0] && frame[frame.Length - 1] == crcBytes[1])
            {
                buffer = tmpBuffer;
                return true;
            }
            else
            {
                buffer = tmpBuffer;
                return false;
            }
        }

        /// <summary>
        /// 在输入的字节数组末端加上校验和字节,校验和算法为从头到尾异或
        /// </summary>
        /// <param name="inputValue">输入的字节数组</param>
        /// <returns>附加了校验和的字节数组</returns>
        public static byte[] AssemblyFrameByCheckSum(this byte[] inputValue)
        {
            if (inputValue == null) throw new ArgumentNullException("inputValue", "inputBytes不能为Null");
            long length = inputValue.Length;
            byte[] checkSum = new byte[] { 0 };
            for (int i = 0; i < length; i++)
            {
                checkSum[0] ^= inputValue[i];
            }
            return inputValue.AppendByteArray(checkSum);
        }

        /// <summary>
        /// 验证输入的字节数组尾端的校验和是否正确
        /// </summary>
        /// <param name="frame">输入的字符数组</param>
        /// <param name="buffer">去掉校验和的字符数组</param>
        /// <returns>true:正确;false:错误</returns>
        public static bool ValidateFrameByCheckSum(this byte[] frame, out byte[] buffer)
        {
            if (frame == null) throw new ArgumentNullException("frame");
            if (frame.Length <= 1) throw new ArgumentOutOfRangeException( "frame","传入的字节数组长度必须大于1" );
            byte[] tmpBuffer = ByteArrayHelper.SubByteArray(frame, 0, frame.Length - 1);
            byte[] tmpFrame = tmpBuffer.AssemblyFrameByCheckSum();
            buffer = tmpBuffer;
            return tmpFrame.AreEqual(frame);
        }
    }
}

[wo22ni]

[Quote=引用 3 楼 linjs137 的回复:]
这个我编过有源代码 不过电脑暂时不在身边 lz不要偷懒 百度下校验原理半个小时内搞定
[/Quote]

见谅呀.新手..业余爱好..

[loveSoftandhxy]

#region 国标算法

/// <summary>
/// 国标算法
/// </summary>
/// <param name="modbusframe">数据</param>
/// <param name="Length">数据字节长度</param>
/// <returns></returns>
public int crc16(byte[] modbusframe,int Length)
{
int i;
int index;
int crc_Low = 0xFF;
int crc_High = 0xFF;

for (i = 0; i<Length; i++)
{
index = crc_High ^ (char)modbusframe[i];
crc_High = crc_Low ^ crc_table[index];
crc_Low = (byte)crc_table[index + 256];
}

return crc_High*256+crc_Low;
}
#endregion

#region CRC校验

/// <summary>
/// CRC校验
/// </summary>
/// <param name="src">ST开头，&&结尾</param>
/// <returns>十六进制数</returns>
public string CRCEfficacy(string src)
{
byte[] byteArr = Encoding.UTF8.GetBytes(src);
int len = byteArr.Length;
int temp = crc16(byteArr, len);
string result = temp.ToString("X");
return result;
}
#endregion

#region CRC校验32位
//生成CRC32码表
public void GetCRC32Table()
{
ulong Crc;
Crc32Table = new ulong[256];
int i,j;
for(i = 0;i < 256; i++)
{
Crc = (ulong)i;
for (j = 8; j > 0; j--)
{
if ((Crc & 1) == 1)
Crc = (Crc >> 1) ^ 0xEDB88320;
else
Crc >>= 1;
}
Crc32Table[i] = Crc;
}
}

//获取字符串的CRC32校验值
public ulong GetCRC32Str(string sInputString)
{
//生成码表
GetCRC32Table();
byte[] buffer = System.Text.ASCIIEncoding.ASCII.GetBytes(sInputString);
ulong value = 0xffffffff;
int len = buffer.Length;
for (int i = 0; i < len; i++)
{
value = (value >> 8) ^ Crc32Table[(value & 0xFF)^ buffer[i]];
}
return value ^ 0xffffffff;
}
#endregion



这个。。。。。网上太多了。。。。每一种检验方式，产生的结果不一定一样。

[wo22ni]

计算CRC16校验值


没有计算CRC32校验值吗.

新手.最好,是有个简单的程序代码..我用VS一打,可直接运行通过的才好..我才好慢慢看.

谢谢