Function fromBase64

src/string.cpp:235–284

std::vector<uint8_t> fromBase64(const std::string& str) {
	std::vector<uint8_t> data;
	uint32_t block = 0;
	int i = 0;
	int padding = 0;

	for (char c : str) {
		uint8_t d = 0;

		if ('A' <= c && c <= 'Z') {
			d = c - 'A';
		}
		else if ('a' <= c && c <= 'z') {
			d = c - 'a' + 26;
		}
		else if ('0' <= c && c <= '9') {
			d = c - '0' + 52;
		}
		else if (c == '+') {
			d = 62;
		}
		else if (c == '/') {
			d = 63;
		}
		else if (c == '=') {
			padding++;
		}
		else {
			// Ignore whitespace and non-base64 characters
			continue;
		}

		block |= uint32_t(d) << (6 * (3 - i));
		i++;

		if (i >= 4) {
			// Decode block
			data.push_back((block >> (8 * (2 - 0))) & 0xff);
			if (padding < 2)
				data.push_back((block >> (8 * (2 - 1))) & 0xff);
			if (padding < 1)
				data.push_back((block >> (8 * (2 - 2))) & 0xff);
			// Reset block
			block = 0;
			i = 0;
			padding = 0;
		}
	}
	return data;
}


int strcasecmp(const char* s1, const char* s2) {