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A sample code to use bytes package. Convert string and byte[], integer and bytes[]
package main
import (
"fmt"
"bytes"
"encoding/binary"
)
func int32_to_bytes(i32 int32) *bytes.Buffer {
bs := []byte {
byte(i32 & 0xFF),
byte(i32 >> 8 & 0xFF),
byte(i32 >> 16 & 0xFF),
byte(i32 >> 24 & 0xFF),
}
return bytes.NewBuffer(bs)
}
func main() {
fmt.Println("---string to byte[] ---")
s := "abc 漢字"
buffer := bytes.NewBufferString(s)
b := buffer.Bytes()
fmt.Println("string", s)
fmt.Println("Buffer", buffer)
fmt.Println("byte[]", b)
fmt.Println("---byte[] to string ---")
b[0] = b[0] - 0x20
b[1] = b[1] - 0x20
b[2] = b[2] - 0x20
fmt.Println("byte[]", b)
buffer = bytes.NewBuffer(b)
fmt.Println("Buffer", buffer)
s = buffer.String()
fmt.Println("string", s)
fmt.Println("--- byte[] to little endian int32 ---")
var i32 int32
b1 := []byte{0xFE, 0xFF, 0xFF, 0xFF} // -2
b2 := []byte{0xFF, 0x00, 0x00, 0x00} // 255
buffer = bytes.NewBuffer(b1)
binary.Read(buffer, binary.LittleEndian, &i32)
fmt.Println(b1, i32)
buffer = bytes.NewBuffer(b2)
binary.Read(buffer, binary.LittleEndian, &i32)
fmt.Println(b2, i32)
fmt.Println("--- little endian int32 to bytes---")
fmt.Println(-3, int32_to_bytes(-3).Bytes())
fmt.Println(254, int32_to_bytes(254).Bytes())
fmt.Println("--- concat bytes---")
b3 := []byte{1,2,3}
b4 := []byte{4,5,6}
fmt.Println(bytes.Join([][]byte{b3, b4}, nil))
}
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