Golang IPv4 String and integer conversion method

1. String to integer

first step:

• Yes to determine whether the string is a legitimate IPv4 address.
• If it is legal, it will be converted into a character array ([]byte).

Step 2:

• The above character array is written into the ret variable in a large-endiment manner using the method.

func InetAddr(ipaddr string) uint32 {
	var ret uint32
 
	ip := (ipaddr)
	if ip == nil {
		return 0
	}
 
	if err := ((ip.To4()), , &ret); err != nil {
		return 0
	}
 
	return ret
}

2. Integer to string

Integer conversion to strings is simpler.

To demonstrate with an example:

There is an IPv4 address hexadecimal integer representation of 0x01020304, which is shifted 24, 16, 8, and 0 respectively.

You will get 4 segments of the IP address string representation:

byte(0x01020304 >> 24) = byte(0x01)           = 1

byte(0x01020304 >> 16) = byte(0x0102)       = 2

byte(0x01020304 >> 8) = byte(0x010203)     = 3

byte(0x01020304 >> 0) = byte(0x01020304) = 4

After splicing these four values ​​with ., you can get the string table: 1.2.3.4

func IPv4Uint32ToString(ip uint32) string {
    return ("%d.%d.%d.%d", byte(ip>>24), byte(ip>>16), byte(ip>>8), byte(ip))
}

Notice:

byte overflows when casting is greater than its stored maximum (0xff), and the left part will be discarded.

Summarize

The above is personal experience. I hope you can give you a reference and I hope you can support me more.