求助，将一段C代码转换成C#语言，转换成功愿赠送20元红包

[u010594009]

源码如下，转换成功后代码请私信给我

#include <stdio.h>
#include <stdlib.h>
#define SIZEOF_CRC32 4
#define KEY_POLYNOMIAL 0x04C11DB7
unsigned int CalculateCRC32(const unsigned char* pDataStream, unsigned int uiLength, unsigned int lCRCKey)
{
    if(pDataStream == NULL)
    {
        return -1;
    };

    if ( !uiLength | !lCRCKey)
        return -1;

    //The CRC processing array (BYTE) comprises of the CRC followed by a data byte
    //The data byte is used to store the last byte to be processed by shifting through
    //the CRC buffer (like a shift register).
    int i, j, iCRC = 0;
    char  cByte = 0;
    int iBytesAdded = 0;
    int  nCarry = 0;

    //bitwise 32 bit modulo long division based on bytes of binary data
    //retain remainder only, not the result
    for (i = 0; i < ( SIZEOF_CRC32 + uiLength); i++) //correct - flush
    {
        //Shift in more bytes of the dividend
        if ( iBytesAdded < uiLength)
        {
            cByte = pDataStream[iBytesAdded++];
        }
        else
        {
            cByte = 0;
        }

        //shift the CRC32 for 8 bits, one byte
        for (j = 0; j < 8; j++)
        {
            if( iCRC < 0)
            {
                nCarry = 1 ;
            }
            else
            {
                nCarry = 0;
            }

            iCRC <<= 1;
            //shift dividend polynomial left by one bit
            if (cByte < 0) iCRC |= 1;
            //add in carry to lsbit
            cByte <<= 1;

            if (nCarry) iCRC ^= lCRCKey;
        }
    }
    return  (unsigned int) iCRC;
}

int main(int argc, char *argv[])
{
    char i, count, value[30];
    printf("请输入字节回车，00 0A 12 00 01 90，计算结果应为6FF93724：\n");
    count=0;
    do
    {
        scanf("%x",&value[count++]);
    }
    while(getchar()!='\n');

    printf("message len is 0x%x\n", count);
    unsigned int crc = CalculateCRC32(value, count, KEY_POLYNOMIAL);
    printf("crc32 is 0x%x\n", crc);
    system("PAUSE");
    return 0;
}

[本拉灯]

引用 4 楼 u010594009 的回复:

[quote=引用 3 楼 LvBao_117 的回复:] 自己转换呗，unsigned int CalculateCRC32(const unsigned char* pDataStream, unsigned int uiLength, unsigned int lCRCKey) { 就是：public uint CalculateCRC32(const uint ref char pDataStream, uint uiLength, uint lCRCKey) {

自己搞不定，char* value 不知道是啥情况，输入16进制的90，结果scanf("%x",&value[count++]) 后变成了-112，不是144[/quote] -112，不是144 一个是有符号一个是无符号 的 你把-112&0xFF就是144了

[by_封爱]

CalculateCRC32校验... 我不清楚你那是什么设备 我这里有一个校验 你看看是不是你想要的...

public static byte[] crc(byte[] src)
        {
            int len = src.Length;
            UInt16 CRC = 0xffff;
            UInt16 next;
            bool carry;
            UInt16 n;

            int i = 0;
            while (len-- > 0)
            {
                next = (UInt16)src[i];
                CRC ^= next;
                for (n = 0; n < 8; n++)
                {
                    carry = (CRC & 1) != 0;
                    CRC >>= 1;
                    if (carry)
                    {
                        CRC ^= 0xA001;
                    }
                }
                i++;
            }
            var a = BitConverter.GetBytes(CRC);
            return a;
        }

如果不是 你也不要着急 直接搜c# crc32校验就可以搜索到相关信息,.

[u010594009]

引用 1 楼 diaodiaop 的回复:

如果不是 你也不要着急 直接搜c# crc32校验就可以搜索到相关信息,.

谢谢你的及时回复。 对方是用此段代码生成校验码的，我也只能用同样的算法生成来比对，但是对c不熟，始终搞不定

[LvBao_117]

自己转换呗，unsigned int CalculateCRC32(const unsigned char* pDataStream, unsigned int uiLength, unsigned int lCRCKey) { 就是：public uint CalculateCRC32(const uint ref char pDataStream, uint uiLength, uint lCRCKey) {

[u010594009]

引用 3 楼 LvBao_117 的回复:

自己转换呗，unsigned int CalculateCRC32(const unsigned char* pDataStream, unsigned int uiLength, unsigned int lCRCKey) { 就是：public uint CalculateCRC32(const uint ref char pDataStream, uint uiLength, uint lCRCKey) {

自己搞不定，char* value 不知道是啥情况，输入16进制的90，结果scanf("%x",&value[count++]) 后变成了-112，不是144

[起个好昵称怎么这么难呢]

public static int SIZEOF_CRC32 = 4;
        public static int KEY_POLYNOMIAL = 0x04C11DB7;
        public static int CalculateCRC32(char[] pDataStream, int uiLength, int lCRCKey)
        {
            if (pDataStream == null)
            {
                return -1;
            };

            if (uiLength == 0 || lCRCKey == 0)
                return -1;
            int i, j, iCRC = 0;
            char cByte = '0';
            int iBytesAdded = 0;
            int nCarry = 0;

            //bitwise 32 bit modulo long division based on bytes of binary data
            //retain remainder only, not the result
            for (i = 0; i < (SIZEOF_CRC32 + uiLength); i++) //correct - flush
            {
                //Shift in more bytes of the dividend
                if (iBytesAdded < uiLength)
                {
                    cByte = pDataStream[iBytesAdded++];
                }
                else
                {
                    cByte = '0';
                }

                //shift the CRC32 for 8 bits, one byte
                for (j = 0; j < 8; j++)
                {
                    if (iCRC < 0)
                    {
                        nCarry = 1;
                    }
                    else
                    {
                        nCarry = 0;
                    }

                    iCRC <<= 1;
                    //shift dividend polynomial left by one bit
                    if (cByte < 0) iCRC |= 1;
                    //add in carry to lsbit
                    cByte <<= 1;

                    if (nCarry == 0)
                        iCRC ^= lCRCKey;
                }
            }
            return (int)iCRC;
        }
        static void Main(string[] args)
        {
            int count = 0;
            char[] value=new char[30] ;
            Console.WriteLine("请输入字节回车，00 0A 12 00 01 90，计算结果应为6FF93724：\n");
            string s = Console.ReadLine();
            foreach (char c in s.ToCharArray()) {
                value[count++] = c;
            }
            Console.WriteLine("message len is {0}", value.Length);
            int crc = CalculateCRC32(value, count, KEY_POLYNOMIAL);
            Console.WriteLine("crc32 is {0}", crc.ToString("x8"));
            Console.ReadLine();
        }

这是按照你的写出来的但是结果和你说的不一样

[u010594009]

引用 5 楼 ymq_2012 的回复:

这是按照你的写出来的但是结果和你说的不一样

主要看结果，不对呀。 if (nCarry == 0) 好像也错了