public static function read_varint()

in Aliyun/Log/protocolbuffers.inc.php [117:148]

• 27 lines of code
• 8 McCabe index (conditional complexity)

	public static function read_varint($fp, &$limit = null) {
		$value = '';
		$len = 0;
		do { // Keep reading until we find the last byte
			$b = fread($fp, 1);
			if ($b === false)
				throw new Exception("read_varint(): Error reading byte");
			if (strlen($b) < 1)
				break;

			$value .= $b;
			$len++;
		} while ($b >= "\x80");

		if ($len == 0) {
			if (feof($fp))
				return false;
			throw new Exception("read_varint(): Error reading byte");
		}

		if ($limit !== null)
			$limit -= $len;

		$i = 0;
		$shift = 0;
		for ($j = 0; $j < $len; $j++) {
			$i |= ((ord($value[$j]) & 0x7F) << $shift);
			$shift += 7;
		}

		return $i;
	}