Function EncodeBase64

src/commons/util/util.cpp:241–280

}

string EncodeBase64(const unsigned char* pch, size_t len) {
    static const char* pbase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    string strRet = "";
    strRet.reserve((len + 2) / 3 * 4);

    int mode = 0, left = 0;
    const unsigned char* pchEnd = pch + len;

    while (pch < pchEnd) {
        int enc = *(pch++);
        switch (mode) {
            case 0:  // we have no bits
                strRet += pbase64[enc >> 2];
                left = (enc & 3) << 4;
                mode = 1;
                break;

            case 1:  // we have two bits
                strRet += pbase64[left | (enc >> 4)];
                left = (enc & 15) << 2;
                mode = 2;
                break;

            case 2:  // we have four bits
                strRet += pbase64[left | (enc >> 6)];
                strRet += pbase64[enc & 63];
                mode = 0;
                break;
        }
    }

    if (mode) {
        strRet += pbase64[left];
        strRet += '=';
        if (mode == 1) strRet += '=';
    }

    return strRet;
}

string EncodeBase64(const string& str) {
    return EncodeBase64((const unsigned char*)str.c_str(), str.size());