binary.Write（）字节排序不适用于[] byte

Question

package main

import (
    "encoding/binary"
    "fmt"
    "bytes"
)

func main(){
    b := new(bytes.Buffer)
    c := new(bytes.Buffer)
    binary.Write(b, binary.LittleEndian, []byte{0, 1})
    binary.Write(b, binary.BigEndian, []byte{0, 1})
    binary.Write(c, binary.LittleEndian, uint16(256))
    binary.Write(c, binary.BigEndian, uint16(256))
    fmt.Println(b.Bytes()) // [0 1 0 1]
    fmt.Println(c.Bytes()) // [0 1 1 0]
}

It is very interesting, why binary.Write() byte ordering is working for uint8, uint16, uint64..etc, but []byte?

If []byte need to be ordered by binary.LittleEndian and write to bytes.Buffer, it needs to be reversed first? Is there any effective ways to solve this problem?

Thanks.

Answer 1

Only integer types get swapped by byte ordering.

When it's a slice of bytes, the binary package wouldn't really know what to swap.

For example, how would it know what to do if you passed 1k of data?

Treat it as int16, int32 or int64?

Or would you expect it to just reverse the whole slice?