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// Copyright 2021 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package lisafs
import (
"math/rand"
"gvisor.dev/gvisor/pkg/marshal/primitive"
)
// MsgSimple is a sample packed struct which can be used to test message passing.
//
// +marshal slice:Msg1Slice
type MsgSimple struct {
A uint16
B uint16
C uint32
D uint64
}
// Randomize randomizes the contents of m.
func (m *MsgSimple) Randomize() {
m.A = uint16(rand.Uint32())
m.B = uint16(rand.Uint32())
m.C = rand.Uint32()
m.D = rand.Uint64()
}
// MsgDynamic is a sample dynamic struct which can be used to test message passing.
//
// +marshal dynamic
type MsgDynamic struct {
N primitive.Uint32
Arr []MsgSimple
}
// SizeBytes implements marshal.Marshallable.SizeBytes.
func (m *MsgDynamic) SizeBytes() int {
return m.N.SizeBytes() +
(int(m.N) * (*MsgSimple)(nil).SizeBytes())
}
// MarshalBytes implements marshal.Marshallable.MarshalBytes.
func (m *MsgDynamic) MarshalBytes(dst []byte) {
m.N.MarshalUnsafe(dst)
dst = dst[m.N.SizeBytes():]
MarshalUnsafeMsg1Slice(m.Arr, dst)
}
// UnmarshalBytes implements marshal.Marshallable.UnmarshalBytes.
func (m *MsgDynamic) UnmarshalBytes(src []byte) {
m.N.UnmarshalUnsafe(src)
src = src[m.N.SizeBytes():]
m.Arr = make([]MsgSimple, m.N)
UnmarshalUnsafeMsg1Slice(m.Arr, src)
}
// Randomize randomizes the contents of m.
func (m *MsgDynamic) Randomize(arrLen int) {
m.N = primitive.Uint32(arrLen)
m.Arr = make([]MsgSimple, arrLen)
for i := 0; i < arrLen; i++ {
m.Arr[i].Randomize()
}
}
// P9Version mimics p9.TVersion and p9.Rversion.
//
// +marshal dynamic
type P9Version struct {
MSize primitive.Uint32
Version string
}
// SizeBytes implements marshal.Marshallable.SizeBytes.
func (v *P9Version) SizeBytes() int {
return (*primitive.Uint32)(nil).SizeBytes() + (*primitive.Uint16)(nil).SizeBytes() + len(v.Version)
}
// MarshalBytes implements marshal.Marshallable.MarshalBytes.
func (v *P9Version) MarshalBytes(dst []byte) {
v.MSize.MarshalUnsafe(dst)
dst = dst[v.MSize.SizeBytes():]
versionLen := primitive.Uint16(len(v.Version))
versionLen.MarshalUnsafe(dst)
dst = dst[versionLen.SizeBytes():]
copy(dst, v.Version)
}
// UnmarshalBytes implements marshal.Marshallable.UnmarshalBytes.
func (v *P9Version) UnmarshalBytes(src []byte) {
v.MSize.UnmarshalUnsafe(src)
src = src[v.MSize.SizeBytes():]
var versionLen primitive.Uint16
versionLen.UnmarshalUnsafe(src)
src = src[versionLen.SizeBytes():]
v.Version = string(src[:versionLen])
}
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