Created
October 19, 2017 10:56
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バイト列を整数に変換する簡単なお仕事メモ(Go言語) ref: http://qiita.com/spiegel-im-spiegel/items/1eb8bcb44c946aa5920d
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package main | |
import ( | |
"encoding/binary" | |
"fmt" | |
) | |
func main() { | |
octets := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07} | |
fmt.Printf("%#016x\n", binary.BigEndian.Uint64(octets)) //0x0001020304050607 | |
fmt.Printf("%#016x\n", binary.LittleEndian.Uint64(octets)) //0x0706050403020100 | |
} |
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package main | |
import ( | |
"encoding/binary" | |
"fmt" | |
) | |
func main() { | |
value := uint64(0x0706050403020100) | |
buf := make([]byte, binary.MaxVarintLen64) //MaxVarintLen64 = 10 | |
binary.BigEndian.PutUint64(buf, value) | |
fmt.Println(buf[:8]) //[7 6 5 4 3 2 1 0] | |
binary.LittleEndian.PutUint64(buf, value) | |
fmt.Println(buf[:8]) //[0 1 2 3 4 5 6 7] | |
} |
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package main | |
import ( | |
"bytes" | |
"encoding/binary" | |
"fmt" | |
) | |
func main() { | |
octets := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07} | |
var value uint64 | |
if err := binary.Read(bytes.NewReader(octets), binary.LittleEndian, &value); err != nil { | |
return | |
} | |
fmt.Printf("%#016x\n", value) //0x0706050403020100 | |
} |
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