subject_27115.htm

一些关于vc的问答

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序号：27115 发表者：mm2003 发表日期：2003-01-08 16:07:35
<br>主题：谁有CRC校验的源码
<br>内容：谁有CRC校验的源码，请发给我，一定给分，谢谢！！
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回复者：bb 回复日期：2003-01-08 16:17:24
<br>内容：unsigned short CalCRC(char *buf, long count)<BR>{<BR>&nbsp;&nbsp; unsigned short crc;<BR>&nbsp;&nbsp; register i;<BR>&nbsp;&nbsp; unsigned char* ptr=(unsigned char*)buf;<BR>&nbsp;&nbsp; crc = 0;<BR>&nbsp;&nbsp; count --;&nbsp;&nbsp;<BR>&nbsp;&nbsp; while (count &gt;= 0) <BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;--count;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;crc = crc ^ (unsigned short)*ptr &lt;&lt; 8;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ptr++;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for (i = 0; i &lt; 8; ++i)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (crc &amp; 0x8000)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;crc = crc &lt;&lt; 1 ^ 0x1021;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; else<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;crc = crc &lt;&lt; 1;<BR>&nbsp;&nbsp; }<BR>&nbsp;&nbsp; return (crc &amp; 0xFFFF);<BR>}
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回复者：mm2003 回复日期：2003-01-08 16:24:59
<br>内容：能否介绍一下它的原理再给分呢？
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