b62_test.go

package b62

import (
        "math"
        "testing"
)

const alphabet = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"

func base62EncodeB(num int) []byte {
        code := make([]byte, 0, 128)

        for num > 0 {
                rem := num % len(alphabet)
                num = num / len(alphabet)

                code = append(code, alphabet[rem])
        }

        for i, j := 0, len(code)-1; i < j; i, j = i+1, j-1 {
                code[i], code[j] = code[j], code[i]
        }

        return code
}

func base62EncodeS(num int) string {
        code := ""
        for num > 0 {
                rem := num % len(alphabet)
                num = num / len(alphabet)

                code = string(alphabet[rem]) + code
        }

        return code
}

func BenchmarkEncodeS(b *testing.B) {
        for i := 0; i < b.N; i++ {
                base62EncodeS(math.MaxInt64 - i)
        }
}

func BenchmarkEncodeB(b *testing.B) {
        for i := 0; i < b.N; i++ {
                base62EncodeB(math.MaxInt64 - i)
        }
}