README.md

go-bitfield

• Pack and Unpack :
  • convert between uint64 and structure
• PackInline and UnpackInline :
  • convert between uint64 and array.

package bitfield_test

import (
    "testing"

    "github.com/hymkor/go-bitfield"
)

const packedValue = 0x7423

type DosDate struct {
    Second int  `bit:"5"`
    Min    uint `bit:"6"`
    Hour   int  `bit:"5"`
}

func TestUnpack(t *testing.T) {
    var dt DosDate
    if err := bitfield.Unpack(uint64(packedValue), &dt); err != nil {
        t.Fatal(err.Error())
        return
    }
    if dt.Second != 3 {
        t.Fatalf("Second: expect 3, but %d", dt.Second)
    }
    if dt.Min != 33 {
        t.Fatalf("Min: expect 33, but %d", dt.Min)
    }
    if dt.Hour != 14 {
        t.Fatalf("Hour: expect 14,but %d", dt.Hour)
    }
}

func TestPack(t *testing.T) {
    var dt = &DosDate{
        Second: 3,
        Min:    33,
        Hour:   14,
    }

    value, err := bitfield.Pack(dt)
    if err != nil {
        t.Fatalf("pack: %s", err.Error())
    }
    if value != packedValue {
        t.Fatalf("pack: expect %d, but %d", packedValue, value)
    }
}

const (
    secondBit = 5
    minBit    = 6
    hourBit   = 5
)

func TestUnpackInline(t *testing.T) {
    dt := bitfield.UnpackInline(packedValue, secondBit, minBit, hourBit)
    if dt[0] != 3 {
        t.Fatalf("Second: expect 3, but %d", dt[0])
    }
    if dt[1] != 33 {
        t.Fatalf("Min: expect 33, but %d", dt[1])
    }
    if dt[2] != 14 {
        t.Fatalf("Hour: expect 14,but %d", dt[2])
    }
}

func TestPackInline(t *testing.T) {
    dt := bitfield.PackInline(secondBit, 3, minBit, 33, hourBit, 14)
    if dt != packedValue {
        t.Fatalf("PackInline expect %d,but %d", packedValue, dt)
    }
}