Radix (Base) Conversion

Sequence of integers (byte, int) can be represent big number in positional numeral system with specified radix.

This project's functions convert input sequence from one radix to output sequence with other radix. Also encode/decode these sequences with specified alphabet.

Aim of this project to implement universal radix converter. But implementation of []byte input conversion using big.Int is more efficient than universtal implementation of []int input conversion. Check benchmarks into convert_test.go.

Base58 encoding (used by Bitcoin and others) builds on this conversion of big number from base 256 to base 58.

Examples

package main

import (
	"fmt"
	"log"
	
	"github.com/bergusman/radix-go"
)

func main() {
	out, err := radix.Convert([]int{1, 3, 3, 7}, 10, 16)
	if err != nil {
		log.Fatal(err)
	}

	str, err := radix.Encode(out, "0123456789ABCDEF")
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(str) // Output: 539

	out, err = radix.Convert([]int{1, 3, 3, 7}, 10, 5)
	if err != nil {
		log.Fatal(err)
	}

	str, err = radix.Encode(out, "🌑🌘🌗🌖🌕")
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(str) // Output: 🌗🌑🌖🌗🌗
}

Base58

package main

import (
	"encoding/hex"
	"fmt"
	"log"

	"github.com/bergusman/radix-go"
)

func main() {
	addr, err := hex.DecodeString("8aee40b8e87eb05bc3b9ff902349bb2dd19a5e90")
	if err != nil {
		log.Fatal(err)
	}

	str, err := radix.Base58Encode(addr, radix.AlphabetBitcoin)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(str) // Output: 2wG9ewuHafzR4yG2hYu8U3YmpZxb
}

Can check here: http://lenschulwitz.com/base58