在Golang中将[]uint32
转换为[]byte
的最有效方法(性能)是什么?
例如:
func main() {
source := []uint32{1,2,3}
dest := make([]byte, 4 * len(source))
// source to dest
// ?
check := len(dest)/4
// dest to check
// ?
}
我有solution,但它包含div,mod和multiply
package main
import (
"fmt"
)
func main() {
source := []uint32{1,2,3}
dest := make([]byte, 4*len(source))
fmt.Println(source)
for start, v := range source {
dest[start*4+0] = byte(v % 256)
dest[start*4+1] = byte(v / 256 % 256)
dest[start*4+2] = byte(v / 256 / 256 % 256)
dest[start*4+3] = byte(v / 256/ 256/ 256% 256)
}
fmt.Println(dest)
check := make([]uint32,cap(dest)/4)
for start := 0; start<len(check); start++ {
check[start] = uint32(dest[start*4+0]) + uint32(dest[start*4+1]) * 256 + uint32(dest[start*4+2]) * 256 * 256 + uint32(dest[start*4+3]) * 256 * 256 * 256
}
fmt.Println(check)
}