How to Process Hexadecimal Strings Larger Than int64?

How to Handle Extraordinarily Large Hexadecimal Strings

When working with hexadecimal strings that exceed the limits of int64, the appropriate solution is to employ the math/big package. This package provides functionalities for dealing with numbers larger than 64 bits.

Example:

Consider the hexadecimal string 0x000000d3c21bcecceda1000000.

package main

import (
    "encoding/json"
    "fmt"
    "math/big"
)

func main() {
    hexString := "0x000000d3c21bcecceda1000000"

    bigInt := big.NewInt(0)
    bigInt.SetString(hexString, 16)

    decimal, ok := bigInt.Float64()
    if !ok {
        // Handle error
    }

    fmt.Println(decimal)

    result, err := json.Marshal(decimal)
    if err != nil {
        // Handle error
    }

    fmt.Println(string(result))
}

This code uses the SetString method to convert the hexadecimal string into a big.Int and then obtains its decimal representation using the Float64 method. The decimal value is then marshaled into a JSON string.

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