200 size_t in_len = encoded_string.size();
204 unsigned char char_array_4[4], char_array_3[3];
207 while (in_len-- && ( encoded_string[in_] !=
'=') &&
is_base64(encoded_string[in_])) {
208 char_array_4[i++] = encoded_string[in_]; in_++;
210 for (i = 0; i <4; i++)
211 char_array_4[i] = (
unsigned char)
base64_chars().find(char_array_4[i]);
213 char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
214 char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
215 char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
217 for (i = 0; (i < 3); i++)
218 ret += char_array_3[i];
224 for (j = i; j <4; j++)
227 for (j = 0; j <4; j++)
228 char_array_4[j] = (
unsigned char)
base64_chars().find(char_array_4[j]);
230 char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
231 char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
232 char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
234 for (j = 0; (j < i - 1); j++) ret += char_array_3[j];
bool is_base64(unsigned char c)
std::string & base64_chars()