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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 (
"fmt"
"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
}
// String implements fmt.Stringer.String.
func (m *MsgDynamic) String() string {
return fmt.Sprintf("MsgDynamic{N: %d, Arr: %v}", m.N, m.Arr)
}
// 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) []byte {
dst = m.N.MarshalUnsafe(dst)
return MarshalUnsafeMsg1Slice(m.Arr, dst)
}
// UnmarshalBytes implements marshal.Marshallable.UnmarshalBytes.
func (m *MsgDynamic) UnmarshalBytes(src []byte) []byte {
src = m.N.UnmarshalUnsafe(src)
m.Arr = make([]MsgSimple, m.N)
return UnmarshalUnsafeMsg1Slice(m.Arr, src)
}
// CheckedUnmarshal implements marshal.CheckedMarshallable.CheckedUnmarshal.
func (m *MsgDynamic) CheckedUnmarshal(src []byte) ([]byte, bool) {
m.Arr = m.Arr[:0]
if m.SizeBytes() > len(src) {
return nil, false
}
src = m.N.UnmarshalUnsafe(src)
if int(m.N) > cap(m.Arr) {
m.Arr = make([]MsgSimple, m.N)
} else {
m.Arr = m.Arr[:m.N]
}
if int(m.N)*(*MsgSimple)(nil).SizeBytes() > len(src) {
return nil, false
}
return UnmarshalUnsafeMsg1Slice(m.Arr, src), true
}
// 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.
type P9Version struct {
MSize primitive.Uint32
Version string
}
// String implements fmt.Stringer.String.
func (v *P9Version) String() string {
return fmt.Sprintf("P9Version{MSize: %d, Version: %s}", v.MSize, v.Version)
}
// 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) []byte {
dst = v.MSize.MarshalUnsafe(dst)
versionLen := primitive.Uint16(len(v.Version))
dst = versionLen.MarshalUnsafe(dst)
return dst[copy(dst, v.Version):]
}
// CheckedUnmarshal implements marshal.CheckedMarshallable.CheckedUnmarshal.
func (v *P9Version) CheckedUnmarshal(src []byte) ([]byte, bool) {
v.Version = ""
if v.SizeBytes() > len(src) {
return nil, false
}
src = v.MSize.UnmarshalUnsafe(src)
var versionLen primitive.Uint16
src = versionLen.UnmarshalUnsafe(src)
if int(versionLen) > len(src) {
return nil, false
}
v.Version = string(src[:versionLen])
return src[versionLen:], true
}
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