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base62.go
59 lines (52 loc) · 1.21 KB
/
base62.go
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package math
import (
"github.com/hopeio/cherry/utils/constraints"
"math"
"strconv"
"unsafe"
)
var str62 string = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
func FormatInt(num, base int64) string {
if base < 37 {
return strconv.FormatInt(num, int(base))
}
var bytes []byte
for num > 0 {
bytes = append(bytes, str62[num%base])
num = num / base
}
reverse(bytes)
return string(bytes)
}
func ParseInt(str string, base float64) (int64, error) {
if base < 37 {
return strconv.ParseInt(str, int(base), strconv.IntSize)
}
var num int64
n := len(str)
for i := 0; i < n; i++ {
pos := findIndex(str[i])
num += int64(math.Pow(base, float64(n-i-1)) * float64(pos))
}
return num, nil
}
func findIndex(b byte) int {
if b < 'A' {
return int(b - '0')
} else if b > 'Z' {
return 10 + int(b-'a')
}
return 36 + int(b-'A')
}
func reverse(a []byte) {
for left, right := 0, len(a)-1; left < right; left, right = left+1, right-1 {
a[left], a[right] = a[right], a[left]
}
}
func FormatFloat(num float64) string {
return strconv.FormatFloat(num, 'f', -1, 64)
}
func ToBytes[T constraints.Number](t T) []byte {
size := unsafe.Sizeof(t)
return unsafe.Slice((*byte)(unsafe.Pointer(&t)), size)
}