hex2bin

typedef BYTE unsigned char;

</pre><pre code_snippet_id="1639451" snippet_file_name="blog_20160408_3_9633505" name="code" class="cpp">BYTE  HexChar[256]={0};

void  InitHexBuff()
{
    HexChar[0] = '0';
    HexChar[1] = '1';
    HexChar[2] = '2';
    HexChar[3] = '3';
    HexChar[4] = '4';
    HexChar[5] = '5';
    HexChar[6] = '6';
    HexChar[7] = '7';
    HexChar[8] = '8';
    HexChar[9] = '9';
    HexChar[0xA] ='A';
    HexChar[0xB] = 'B';
    HexChar[0xC] = 'C';
    HexChar[0xD] = 'D';
    HexChar[0xE] = 'E';
    HexChar[0xF] = 'F';
    HexChar['0'] = 0;
    HexChar['1'] = 1;
    HexChar['2'] = 2;
    HexChar['3'] = 3;
    HexChar['4'] = 4;
    HexChar['5'] = 5;
    HexChar['6'] = 6;
    HexChar['7'] = 7;
    HexChar['8'] = 8;
    HexChar['9'] = 9;
    HexChar['A'] = 0xA;
    HexChar['B'] = 0xB;
    HexChar['C'] = 0xC;
    HexChar['D'] = 0xD;
    HexChar['E'] = 0xE;
    HexChar['F'] = 0xF;

}

void  Hex2Bin(char* hex,int len,BYTE* Outbuff)
{
    for (int i = 0;i<len;i+=2)
    {
        BYTE a = hex[i];
        BYTE b = hex[i+1];
        Outbuff[i/2] = (HexChar[a] << 4)+HexChar[b];
    }
}