Function base64_decode

src/SHADERed/Objects/WebAPI.cpp:304–346

		return (isalnum(c) || (c == '+') || (c == '/'));
	}
	std::string base64_decode(std::string const& encoded_string)
	{
		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;
	}


	WebAPI::WebAPI()