C语言中HEX转ASCII函数，ASCII转HEX函数，ASCII转DEC函数，四字节大小端转换函数整理

本文转载自查看原文 2020-11-21 23:37 362 算法/ 工作相关

转自大佬：https://blog.csdn.net/u010761559/article/details/83508834

 1 int HexToAscii(unsigned char *pHexStr,unsigned char *pAscStr,int Len)
 2 {
 3     char Nibble[2];
 4     unsigned char Buffer[2048];
 5     int i = 0;
 6     int j = 0;
 7 
 8     for(i=0;i<Len;i++)
 9     {
10         Nibble[0]=pHexStr[i] >> 4 & 0X0F;
11         Nibble[1]=pHexStr[i] & 0x0F;
12         for(j=0;j<2;j++)
13         {
14             if(Nibble[j]<10)
15             {
16                 Nibble[j]=Nibble[j]+0x30;
17             }
18             else if(Nibble[j]<16)
19             {
20                 Nibble[j]=Nibble[j]-10+'A';
21             }
22             else
23             {
24                 return 0;
25             }
26         }
27         memcpy(Buffer+i*2,Nibble,2);
28     }
29     Buffer[2*Len]=0x00;
30     memcpy(pAscStr,Buffer,2*Len);
31     pAscStr[2*Len]=0x00;
32     return 1;
33 }
34 }

 1 char  AsciiToHex(unsigned char * pAscii, unsigned char * pHex, int nLen)
 2 {
 3     int nHexLen = nLen / 2;
 4     unsigned char Nibble[2] = {0};
 5     int i = 0;
 6     int j = 0;
 7 
 8     if (nLen%2)
 9     {
10         return 1;
11     }
12 
13     for (i = 0; i < nHexLen; i ++)
14     {
15         Nibble[0] = *pAscii ++;        
16         Nibble[1] = *pAscii ++;
17         for (j = 0; j < 2; j ++)
18         {
19             if (Nibble[j] <= 'F' && Nibble[j] >= 'A')
20                 Nibble[j] = Nibble[j] - 'A' + 10;
21             else if (Nibble[j] <= 'f' && Nibble[j] >= 'a')
22                 Nibble[j] = Nibble[j] - 'a' + 10;
23             else if (Nibble[j] >= '0' && Nibble[j] <= '9')
24                 Nibble [j] = Nibble[j] - '0';
25             else
26                 return 1;//Nibble[j] = Nibble[j] - 'a' + 10;
27             
28         }    // for (int j = ...)
29         pHex[i] = Nibble[0] << 4;    // Set the high nibble
30         pHex[i] |= Nibble[1];    //Set the low nibble
31     }    // for (int i = ...)
32     return 0;
33 }

 1 char  AsciiToDec(unsigned char * pAscii, unsigned char * pHex, int nLen)
 2 {
 3     int nHexLen = nLen / 2;
 4     unsigned char Nibble[2] = {0};
 5     int i = 0;
 6     int j = 0;
 7 
 8     if (nLen%2)
 9     {
10         return 1;
11     }
12 
13     for (i = 0; i < nHexLen; i ++)
14     {
15         Nibble[0] = *pAscii ++;        
16         Nibble[1] = *pAscii ++;
17         for (j = 0; j < 2; j ++)
18         {
19             Nibble [j] = Nibble[j] - '0';
20         }    // for (int j = ...)
21     
22         pHex[i] = Nibble[0] * 10;    // Set the high nibble
23         pHex[i] += Nibble[1];    //Set the low nibble
24     }    // for (int i = ...)
25     return 0;
26 }

1 #define REVERSE(a) (((a) & 0xff) << 24 | ((a) & 0xff00) << 8 | ((a) & 0xff0000) >> 8 | ((a) & 0xff000000) >> 24)
2 //32位数据四个字节大小端转换

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