package main import ( "fmt" "math" ) var base = []string {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","1","2","3","4","5","6","7","8","9","0"} func base62encode(num int) string { baseStr := "" for { if num <= 0 { break } i := num % 62 baseStr += base[i] num = (num - i) / 62 } return baseStr } func base62decode(base62 string) int { rs := 0 len := len(base62) f := flip(base) for i := 0; i < len; i++ { rs += f[string(base62[i])] * int(math.Pow(62, float64(i))) } return rs } func flip(s []string) map[string]int { f := make(map[string]int) for index, value := range s { f[value] = index } return f } func main() { m := base62encode(12645354) fmt.Println(m) fmt.Println(base62decode(m)) }
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