BIN转换成HEX格式及HEX转换成BIN的两个函数接口

unsigned char HEX2BYTE(unsigned char hex_ch)
{
    if (hex_ch >= '' && hex_ch <= '')
    {
        return hex_ch - '';
    }

    if (hex_ch >= 'a' && hex_ch <= 'f')
    {
        return hex_ch - 'a' + ;
    }

    if (hex_ch >= 'A' && hex_ch <= 'F')
    {
        return hex_ch - 'A' + ;
    }

    return 0x00;
}

unsigned char _4BIT2HEX(unsigned char part_cn)
{
    if (part_cn >= ) {
        return (unsigned char )(part_cn -  + 'A');
    } else {
        return (unsigned char )(part_cn + '');
    }
}

void StrToHex(const unsigned char* in, long inlen, unsigned char* out, long* outlen)
{
    *outlen = inlen/;
    memset(out, , *outlen);
    for (int i = ; i < *outlen; i ++) {
        out[i] = (HEX2BYTE(in[i*]) << ) | HEX2BYTE(in[i* + ]);
    }
}

void HexToStr(const unsigned char* in, long inlen, unsigned char* out, long* outlen)
{
    *outlen = inlen*;
    memset(out, , *outlen  + );
    for (int i = , j = ; i < *outlen; i ++, i++, j++) {
        out[i] = _4BIT2HEX(((in[j]) & 0xF0)>>);
        out[i+] = _4BIT2HEX(((in[j]) & 0x0F));
    }
}