Function qrcodegen_makeNumeric

modules/data/qrcode/qrcodegen.c:790–820

Public function - see documentation comment in header file.

// Public function - see documentation comment in header file.
struct qrcodegen_Segment qrcodegen_makeNumeric(const char *digits, uint8_t buf[]) {
	assert(digits != NULL);
	struct qrcodegen_Segment result;
	size_t len = c_strlen(digits);
	result.mode = qrcodegen_Mode_NUMERIC;
	int bitLen = calcSegmentBitLength(result.mode, len);
	assert(bitLen != -1);
	result.numChars = (int)len;
	if (bitLen > 0)
		memset(buf, 0, ((size_t)bitLen + 7) / 8 * sizeof(buf[0]));
	result.bitLength = 0;
	
	unsigned int accumData = 0;
	int accumCount = 0;
	for (; *digits != '\0'; digits++) {
		char c = *digits;
		assert('0' <= c && c <= '9');
		accumData = accumData * 10 + (c - '0');
		accumCount++;
		if (accumCount == 3) {
			appendBitsToBuffer(accumData, 10, buf, &result.bitLength);
			accumData = 0;
			accumCount = 0;
		}
	}
	if (accumCount > 0)  // 1 or 2 digits remaining
		appendBitsToBuffer(accumData, accumCount * 3 + 1, buf, &result.bitLength);
	assert(result.bitLength == bitLen);
	result.data = buf;
	return result;
}


// Public function - see documentation comment in header file.