Create ipconversion.py

conversions/ipconversion.py

@@ -0,0 +1,59 @@
+# https://www.geeksforgeeks.org/convert-ip-address-to-integer-and-vice-versa/
+
+def ip_to_decimal(ip_address: str) -> int:
+    """
+    Convert an IPv4 address to its decimal representation.
+
+    Args:
+        ip_address (str): A string representing an IPv4 address (e.g., "192.168.0.1").
+
+    Returns:
+        int: The decimal representation of the IP address.
+
+    >>> ip_to_decimal("192.168.0.1")
+    3232235521
+    >>> ip_to_decimal("10.0.0.255")
+    167772415
+    """
+
+    ip_parts = ip_address.split('.')
+    if len(ip_parts) != 4:
+        raise ValueError("Invalid IPv4 address format")
+
+    decimal_ip = 0
+    for part in ip_parts:
+        decimal_ip = (decimal_ip << 8) + int(part)
+
+    return decimal_ip
+
+def decimal_to_ip(decimal_ip: int) -> str:
+    """
+    Convert a decimal representation of an IP address to its IPv4 format.
+
+    Args:
+        decimal_ip (int): An integer representing the decimal IP address.
+
+    Returns:
+        str: The IPv4 representation of the decimal IP address.
+
+    >>> decimal_to_ip(3232235521)
+    '192.168.0.1'
+    >>> decimal_to_ip(167772415)
+    '10.0.0.255'
+    """
+
+    if not (0 <= decimal_ip <= 4294967295):
+        raise ValueError("Invalid decimal IP address")
+
+    ip_parts = []
+    for _ in range(4):
+        ip_parts.append(str(decimal_ip & 255))
+        decimal_ip >>= 8
+
+    ip_parts.reverse()
+    return '.'.join(ip_parts)
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()