std::string ret;

int i = 0;

int j = 0;

unsigned char char_array_3[3];

unsigned char char_array_4[4];

while (in_len--) {

char_array_3[i++] = *(bytes_to_encode++);

if (i == 3) {

char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;

char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);

char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);

char_array_4[3] = char_array_3[2] & 0x3f;

for(i = 0; (i <4) ; i++)

ret += base64_chars[char_array_4[i]];

i = 0;

}

}

if (i)

{

for(j = i; j < 3; j++)

char_array_3[j] = '\0';

char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;

char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);

char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);

char_array_4[3] = char_array_3[2] & 0x3f;

for (j = 0; (j < i + 1); j++)

ret += base64_chars[char_array_4[j]];

while((i++ < 3))

ret += '=';

}

return ret;

int in_len = encoded_string.size();

int i = 0;

int j = 0;

int in_ = 0;

unsigned char char_array_4[4], char_array_3[3];

std::string ret;

while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {

char_array_4[i++] = encoded_string[in_]; in_++;

if (i ==4) {

for (i = 0; i <4; i++)

char_array_4[i] = base64_chars.find(char_array_4[i]);

char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);

char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);

char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

for (i = 0; (i < 3); i++)

ret += char_array_3[i];

i = 0;

}

}

if (i) {

for (j = i; j <4; j++)

char_array_4[j] = 0;

for (j = 0; j <4; j++)

char_array_4[j] = base64_chars.find(char_array_4[j]);

char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);

char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);

char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

for (j = 0; (j < i - 1); j++) ret += char_array_3[j];

}

return ret;

}