/
main.go
121 lines (100 loc) · 1.95 KB
/
main.go
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package main
import (
"bytes"
"encoding/binary"
"fmt"
"log"
"github.com/nokute78/go-bit/v2"
)
type (
OneByte struct {
B1 bit.Bit
B2 bit.Bit
B3 bit.Bit
B4 bit.Bit
B5 bit.Bit
B6 bit.Bit
B7 bit.Bit
B8 bit.Bit
}
CompositeBitField struct {
Length [4]bit.Bit
Value [3]bit.Bit
Flag bit.Bit
}
)
func (me OneByte) String() string {
return fmt.Sprintf("%v%v%v%v%v%v%v%v", me.B1, me.B2, me.B3, me.B4, me.B5, me.B6, me.B7, me.B8)
}
func init() {
log.SetFlags(0)
}
func main() {
if err := run(); err != nil {
log.Fatal(err)
}
/*
$ task
task: [default] go run main.go
1 : 00000001
2 : 00000010
3 : 00000011
7 : 00000111
15 : 00001111
16 : 00010000
127 : 01111111
128 : 10000000
129 : 10000001
255 : 11111111
Length= 8([0 0 0 1]), Value=1([1 0 0]), Flag=0(0)
Length= 4([0 0 1 0]), Value=3([1 1 0]), Flag=1(1)
Length=15([1 1 1 1]), Value=0([0 0 0]), Flag=1(1)
*/
}
func run() error {
if err := readOneByte(); err != nil {
return err
}
if err := readComposite(); err != nil {
return err
}
return nil
}
func readOneByte() error {
var (
source = []byte{1, 2, 3, 7, 15, 16, 127, 128, 129, 255}
buf = bytes.NewBuffer(source)
data [10]OneByte
err error
)
err = bit.Read(buf, binary.BigEndian, &data)
if err != nil {
return err
}
for i, b := range source {
log.Printf("%3d : %s", b, data[i])
}
return nil
}
func readComposite() error {
var (
source = []byte{0x82, 0x47, 0xF1}
endian = binary.BigEndian
buf = bytes.NewBuffer(source)
data [3]CompositeBitField
err error
)
err = bit.Read(buf, endian, &data)
if err != nil {
return err
}
for _, d := range data {
var (
l = bit.BitsToBytes(d.Length[:], endian)[0]
v = bit.BitsToBytes(d.Value[:], endian)[0]
r = bit.BitsToBytes([]bit.Bit{d.Flag}, endian)[0]
)
log.Printf("Length=%2d(%v), Value=%d(%v), Flag=%d(%v)", l, d.Length, v, d.Value, r, d.Flag)
}
return nil
}