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|
//go:build linux
// +build linux
package packet
import (
"encoding/binary"
"fmt"
"math"
"testing"
"github.com/google/go-cmp/cmp"
"github.com/josharian/native"
)
func Test_htons(t *testing.T) {
tests := []struct {
name string
i int
vLE, vBE uint16
ok bool
}{
{
name: "negative",
i: -1,
},
{
name: "too large",
i: math.MaxUint16 + 1,
},
{
name: "IPv4",
i: 0x0800,
vLE: 0x0008,
vBE: 0x0800,
ok: true,
},
{
name: "IPv6",
i: 0x86dd,
vLE: 0xdd86,
vBE: 0x86dd,
ok: true,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
v, err := htons(tt.i)
if tt.ok && err != nil {
t.Fatalf("failed to perform htons: %v", err)
}
if !tt.ok && err == nil {
t.Fatal("expected an error, but none occurred")
}
if err != nil {
t.Logf("err: %v", err)
return
}
// Depending on our GOARCH, the result may be big or little endian.
var want uint16
if native.Endian == binary.ByteOrder(binary.LittleEndian) {
want = tt.vLE
} else {
want = tt.vBE
}
if diff := cmp.Diff(hex(want), hex(v)); diff != "" {
t.Fatalf("unexpected output for %s GOARCH (-want +got):\n%s", native.Endian.String(), diff)
}
})
}
}
func hex(v uint16) string {
return fmt.Sprintf("%#04x", v)
}
|
