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86 lines
2.2 KiB
Python
86 lines
2.2 KiB
Python
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# https://www.geeksforgeeks.org/convert-ip-address-to-integer-and-vice-versa/
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def ipv4_to_decimal(ipv4_address: str) -> int:
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"""
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Convert an IPv4 address to its decimal representation.
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Args:
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ip_address: A string representing an IPv4 address (e.g., "192.168.0.1").
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Returns:
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int: The decimal representation of the IP address.
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>>> ipv4_to_decimal("192.168.0.1")
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3232235521
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>>> ipv4_to_decimal("10.0.0.255")
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167772415
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>>> ipv4_to_decimal("10.0.255")
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Traceback (most recent call last):
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...
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ValueError: Invalid IPv4 address format
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>>> ipv4_to_decimal("10.0.0.256")
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Traceback (most recent call last):
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...
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ValueError: Invalid IPv4 octet 256
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"""
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octets = [int(octet) for octet in ipv4_address.split(".")]
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if len(octets) != 4:
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raise ValueError("Invalid IPv4 address format")
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decimal_ipv4 = 0
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for octet in octets:
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if not 0 <= octet <= 255:
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raise ValueError(f"Invalid IPv4 octet {octet}") # noqa: EM102
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decimal_ipv4 = (decimal_ipv4 << 8) + int(octet)
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return decimal_ipv4
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def alt_ipv4_to_decimal(ipv4_address: str) -> int:
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"""
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>>> alt_ipv4_to_decimal("192.168.0.1")
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3232235521
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>>> alt_ipv4_to_decimal("10.0.0.255")
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167772415
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"""
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return int("0x" + "".join(f"{int(i):02x}" for i in ipv4_address.split(".")), 16)
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def decimal_to_ipv4(decimal_ipv4: int) -> str:
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"""
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Convert a decimal representation of an IP address to its IPv4 format.
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Args:
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decimal_ipv4: An integer representing the decimal IP address.
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Returns:
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The IPv4 representation of the decimal IP address.
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>>> decimal_to_ipv4(3232235521)
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'192.168.0.1'
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>>> decimal_to_ipv4(167772415)
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'10.0.0.255'
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>>> decimal_to_ipv4(-1)
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Traceback (most recent call last):
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...
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ValueError: Invalid decimal IPv4 address
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"""
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if not (0 <= decimal_ipv4 <= 4294967295):
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raise ValueError("Invalid decimal IPv4 address")
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ip_parts = []
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for _ in range(4):
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ip_parts.append(str(decimal_ipv4 & 255))
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decimal_ipv4 >>= 8
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return ".".join(reversed(ip_parts))
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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