一个文本转2进制的函数_移动短信技术

看到前面有人要，我在这里贴一个函数。
int HexToBin(char *sHex ,char *pBuf ,int ilen)
{
    unsigned char sHexStr[3] ;
    int iErr=0 ;
    memset(sHexStr,0x0,3) ;
    for( int i=0;i<ilen;i++)
    {
        memcpy(sHexStr,&sHex[i*2],2) ;
        if( sHexStr[0]>=0 && sHexStr[0]<=9 )
            sHexStr[0]=sHexStr[0]-0 ;        
        else
            if( sHexStr[0]>=A && sHexStr[0]<=F )
                sHexStr[0]=sHexStr[0]-A+10 ;        
            else
            {
                sHexStr[0] = 0 ;
                iErr++ ;
            }

        if( sHexStr[1]>=0 && sHexStr[1]<=9 )
            sHexStr[1]=sHexStr[1]-0 ;        
        else
            if( sHexStr[1]>=A && sHexStr[1]<=F )
                sHexStr[1]=sHexStr[1]-A+10 ;        
            else
            {
                sHexStr[1] = 0 ;
                iErr++ ;
            }    
        pBuf[i] = sHexStr[0]*16 + sHexStr[1] ;
    }
    return iErr ;
}