参考好压软件的CRC校验源码，也是来源于7z的源代码，较好实现了字符串的crc校验码的生成。-Good reference pressure source software CRC checksum, is derived from the 7z source code to achieve a better string crc check code generation.

CRC校验的C语言代码,32位的CRC，自己编译通过的没有问题-the code of the CRC

32位CRC循环冗余源代码 符合ANSI X3,66标准,运用于CCITT s X,25协议-32-bit CRC cyclic redundancy code in accordance with ANSI X3, 66 standard, used in CCITT s X, 25 protocol