CRC8校验代码,CSharp代码库,德仔网

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【CSharp】 CRC8校验

作者:Dezai.CN / 发布于2012/7/9/ 462

CRC8校验

<div>1. 查表法:</div>
<div></div>
<div>public class CRC8
{
 /// <summary> 
 /// CRC8位校验表 
 /// </summary> 
 private byte[] CRC8Table = new byte[] { 
,94,188,226,97,63,221,131,194,156,126,32,163,253,31,65, 
,195,33,127,252,162,64,30, 95,1,227,189,62,96,130,220,
,125,159,193,66,28,254,160,225,191,93,3,128,222,60,98,
,224,2,92,223,129,99,61,124,34,192,158,29,67,161,255,
,24,250,164,39,121,155,197,132,218,56,102,229,187,89,7,
,133,103,57,186,228,6,88,25,71,165,251,120,38,196,154,
,59,217,135,4,90,184,230,167,249,27,69,198,152,122,36,
,166,68,26,153,199,37,123,58,100,134,216,91,5,231,185,
,210,48,110,237,179,81,15,78,16,242,172,47,113,147,205,
,79,173,243,112,46,204,146,211,141,111,49,178,236,14,80,
,241,19,77,206,144,114,44,109,51,209,143,12,82,176,238,
,108,142,208,83,13,239,177,240,174,76,18,145,207,45,115,
,148,118,40,171,245,23,73,8,86,180,234,105,55,213,139,
,9,235,181,54,104,138,212,149,203, 41,119,244,170,72,22,
,183,85,11,136,214,52,106,43,117,151,201,74,20,246,168,
,42,200,150,21,75,169,247,182,232,10,84,215,137,107,53 };</div>
<div> public byte CRC(byte[] buffer)
 {
 return CRC(buffer, 0, buffer.Length);
 }
<div> public byte CRC(byte[] buffer, int off, int len)
 {
 byte crc = 0;
 if (buffer == null)
 {
 throw new ArgumentNullException("buffer");
 }
 if (off < 0 || len < 0 || off + len > buffer.Length)
 {
 throw new ArgumentOutOfRangeException();
 }
<div> for (int i = off; i < len; i++)
 {
 crc = CRC8Table[crc ^ buffer[i]];
 }
 return crc;
 }
}
<div></div>
<div>2. 计算法1:</div>
<div></div>
<div>public static byte CRC8(byte[] buffer)
{
 byte crc = 0;
 for (int j = 0; j < buffer.Length; j++)
 {
 crc ^= buffer[j];
 for (int i = 0; i < 8; i++)
 {
 if ((crc & 0x01) != 0)
 {
 crc >>= 1;
 crc ^= 0x8c;
 }
 else
 {
 crc >>= 1;
 }
 }
 }
 return crc;
}
<div></div>
<div>3. 计算法2:</div>
<div></div>
<div>public byte CRC8(byte[] buffer) 
{ 
 byte crc=0;
 for (int j=0;j<buffer.Length;j++)
 {
 for (int i = 1; i != 0; i *= 2)
 {
 if ((crc & 1) != 0)
 {
 crc /= 2;
 crc ^= 0x8C;
 }
 else
 {
 crc /= 2;
 }
 if ((buffer[j] & i) != 0) crc ^= 0x8C; 
 } 
 }
 return crc;
}

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