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serializer.go
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serializer.go
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package serializer
import (
"bytes"
"encoding/binary"
"fmt"
"math"
"time"
)
type (
// ArrayOf32Bytes is an array of 32 bytes.
ArrayOf32Bytes = [32]byte
// ArrayOf64Bytes is an array of 64 bytes.
ArrayOf64Bytes = [64]byte
// ArrayOf49Bytes is an array of 49 bytes.
ArrayOf49Bytes = [49]byte
// SliceOfArraysOf32Bytes is a slice of arrays of which each is 32 bytes.
SliceOfArraysOf32Bytes = []ArrayOf32Bytes
// SliceOfArraysOf64Bytes is a slice of arrays of which each is 64 bytes.
SliceOfArraysOf64Bytes = []ArrayOf64Bytes
// ErrProducer produces an error.
ErrProducer func(err error) error
// ErrProducerWithLeftOver produces an error and is called with the bytes left to read.
ErrProducerWithLeftOver func(left int, err error) error
// WrittenObjectConsumer gets called after an object has been serialized into a Serializer.
WrittenObjectConsumer func(index int, written []byte) error
// ReadObjectConsumerFunc gets called after an object has been deserialized from a Deserializer.
ReadObjectConsumerFunc func(seri Serializable)
// ReadObjectsConsumerFunc gets called after objects have been deserialized from a Deserializer.
ReadObjectsConsumerFunc func(seri Serializables)
)
// SeriLengthPrefixType defines the type of the value denoting the length of a collection.
type SeriLengthPrefixType byte
const (
// SeriLengthPrefixTypeAsByte defines a collection length to be denoted by a byte.
SeriLengthPrefixTypeAsByte SeriLengthPrefixType = iota
// SeriLengthPrefixTypeAsUint16 defines a collection length to be denoted by a uint16.
SeriLengthPrefixTypeAsUint16
// SeriLengthPrefixTypeAsUint32 defines a collection length to be denoted by a uint32.
SeriLengthPrefixTypeAsUint32
)
// NewSerializer creates a new Serializer.
func NewSerializer() *Serializer {
return &Serializer{}
}
// Serializer is a utility to serialize bytes.
type Serializer struct {
buf bytes.Buffer
err error
}
// Serialize finishes the serialization by returning the serialized bytes
// or an error if any intermediate step created one.
func (s *Serializer) Serialize() ([]byte, error) {
if s.err != nil {
return nil, s.err
}
return s.buf.Bytes(), nil
}
// AbortIf calls the given ErrProducer if the Serializer did not encounter an error yet.
// Return nil from the ErrProducer to indicate continuation of the serialization.
func (s *Serializer) AbortIf(errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
if err := errProducer(nil); err != nil {
s.err = err
}
return s
}
// Do calls f in the Serializer chain.
func (s *Serializer) Do(f func()) *Serializer {
if s.err != nil {
return s
}
f()
return s
}
// Written returns the amount of bytes written into the Serializer.
func (s *Serializer) Written() int {
return s.buf.Len()
}
// WriteNum writes the given num v to the Serializer.
func (s *Serializer) WriteNum(v interface{}, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
if err := binary.Write(&s.buf, binary.LittleEndian, v); err != nil {
s.err = errProducer(err)
}
return s
}
// WriteBool writes the given bool to the Serializer.
func (s *Serializer) WriteBool(v bool, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
var val byte
if v {
val = 1
}
if err := s.buf.WriteByte(val); err != nil {
s.err = errProducer(err)
}
return s
}
// WriteByte writes the given byte to the Serializer.
func (s *Serializer) WriteByte(data byte, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
if err := s.buf.WriteByte(data); err != nil {
s.err = errProducer(err)
}
return s
}
// WriteBytes writes the given byte slice to the Serializer.
// Use this function only to write fixed size slices/arrays, otherwise
// use WriteVariableByteSlice instead.
func (s *Serializer) WriteBytes(data []byte, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
if _, err := s.buf.Write(data); err != nil {
s.err = errProducer(err)
}
return s
}
// writes the given length to the Serializer as the defined SeriLengthPrefixType.
func (s *Serializer) writeSliceLength(l int, lenType SeriLengthPrefixType, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
switch lenType {
case SeriLengthPrefixTypeAsByte:
if l > math.MaxUint8 {
s.err = errProducer(fmt.Errorf("unable to serialize collection length: length %d is out of range (0-%d)", l, math.MaxUint8))
return s
}
if err := s.buf.WriteByte(byte(l)); err != nil {
s.err = errProducer(err)
return s
}
case SeriLengthPrefixTypeAsUint16:
if l > math.MaxUint16 {
s.err = errProducer(fmt.Errorf("unable to serialize collection length: length %d is out of range (0-%d)", l, math.MaxUint16))
return s
}
if err := binary.Write(&s.buf, binary.LittleEndian, uint16(l)); err != nil {
s.err = errProducer(err)
return s
}
case SeriLengthPrefixTypeAsUint32:
if l > math.MaxUint32 {
s.err = errProducer(fmt.Errorf("unable to serialize collection length: length %d is out of range (0-%d)", l, math.MaxUint32))
return s
}
if err := binary.Write(&s.buf, binary.LittleEndian, uint32(l)); err != nil {
s.err = errProducer(err)
return s
}
default:
panic(fmt.Sprintf("unknown slice length type %v", lenType))
}
return s
}
// WriteVariableByteSlice writes the given slice with its length to the Serializer.
func (s *Serializer) WriteVariableByteSlice(data []byte, lenType SeriLengthPrefixType, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
_ = s.writeSliceLength(len(data), lenType, errProducer)
if s.err != nil {
return s
}
if _, err := s.buf.Write(data); err != nil {
s.err = errProducer(err)
return s
}
return s
}
// Write32BytesArraySlice writes a slice of arrays of 32 bytes to the Serializer.
func (s *Serializer) Write32BytesArraySlice(data SliceOfArraysOf32Bytes, deSeriMode DeSerializationMode, lenType SeriLengthPrefixType, arrayRules *ArrayRules, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
sliceLength := len(data)
var arrayElementValidator ElementValidationFunc
if arrayRules != nil && deSeriMode.HasMode(DeSeriModePerformValidation) {
if err := arrayRules.CheckBounds(uint(sliceLength)); err != nil {
s.err = errProducer(err)
return s
}
arrayElementValidator = arrayRules.ElementValidationFunc(arrayRules.ValidationMode)
}
_ = s.writeSliceLength(sliceLength, lenType, errProducer)
if s.err != nil {
return s
}
for i := range data {
element := data[i][:]
if arrayElementValidator != nil {
if err := arrayElementValidator(i, element); err != nil {
s.err = errProducer(err)
return s
}
}
if _, err := s.buf.Write(element); err != nil {
s.err = errProducer(err)
return s
}
}
return s
}
// Write64BytesArraySlice writes a slice of arrays of 64 bytes to the Serializer.
func (s *Serializer) Write64BytesArraySlice(data SliceOfArraysOf64Bytes, deSeriMode DeSerializationMode, lenType SeriLengthPrefixType, arrayRules *ArrayRules, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
sliceLength := len(data)
var arrayElementValidator ElementValidationFunc
if arrayRules != nil && deSeriMode.HasMode(DeSeriModePerformValidation) {
if err := arrayRules.CheckBounds(uint(sliceLength)); err != nil {
s.err = errProducer(err)
return s
}
arrayElementValidator = arrayRules.ElementValidationFunc(arrayRules.ValidationMode)
}
_ = s.writeSliceLength(sliceLength, lenType, errProducer)
if s.err != nil {
return s
}
for i := range data {
element := data[i][:]
if arrayElementValidator != nil {
if err := arrayElementValidator(i, element); err != nil {
s.err = errProducer(err)
return s
}
}
if _, err := s.buf.Write(element); err != nil {
s.err = errProducer(err)
return s
}
}
return s
}
// WriteObject writes the given Serializable to the Serializer.
func (s *Serializer) WriteObject(seri Serializable, deSeriMode DeSerializationMode, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
seriBytes, err := seri.Serialize(deSeriMode)
if err != nil {
s.err = errProducer(err)
return s
}
if _, err := s.buf.Write(seriBytes); err != nil {
s.err = errProducer(err)
}
return s
}
// WriteSliceOfObjects writes Serializables into the Serializer.
// For every written Serializable, the given WrittenObjectConsumer is called if it isn't nil.
func (s *Serializer) WriteSliceOfObjects(seris Serializables, deSeriMode DeSerializationMode, lenType SeriLengthPrefixType, woc WrittenObjectConsumer, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
_ = s.writeSliceLength(len(seris), lenType, errProducer)
if s.err != nil {
return s
}
for i, seri := range seris {
ser, err := seri.Serialize(deSeriMode)
if err != nil {
s.err = errProducer(err)
return s
}
if _, err := s.buf.Write(ser); err != nil {
s.err = errProducer(err)
return s
}
if woc != nil {
if err := woc(i, ser); err != nil {
s.err = errProducer(err)
return s
}
}
}
return s
}
// WriteTime writes a marshaled Time value to the internal buffer.
func (s *Serializer) WriteTime(timeToWrite time.Time, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
nanoSeconds := timeToWrite.UnixNano()
// the zero value of time translates to -6795364578871345152
if nanoSeconds == -6795364578871345152 {
if err := binary.Write(&s.buf, binary.LittleEndian, nanoSeconds); err != nil {
s.err = errProducer(err)
}
} else {
if err := binary.Write(&s.buf, binary.LittleEndian, nanoSeconds); err != nil {
s.err = errProducer(err)
}
}
return s
}
// WritePayload writes the given payload Serializable into the Serializer.
// This is different to WriteObject as it also writes the length denotation of the payload.
func (s *Serializer) WritePayload(payload Serializable, deSeriMode DeSerializationMode, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
if payload == nil {
if err := binary.Write(&s.buf, binary.LittleEndian, uint32(0)); err != nil {
s.err = errProducer(fmt.Errorf("unable to serialize zero payload length: %w", err))
}
return s
}
payloadBytes, err := payload.Serialize(deSeriMode)
if err != nil {
s.err = errProducer(fmt.Errorf("unable to serialize payload: %w", err))
return s
}
if err := binary.Write(&s.buf, binary.LittleEndian, uint32(len(payloadBytes))); err != nil {
s.err = errProducer(fmt.Errorf("unable to serialize payload length: %w", err))
return s
}
if _, err := s.buf.Write(payloadBytes); err != nil {
s.err = errProducer(err)
}
return s
}
// WriteString writes the given string to the Serializer.
func (s *Serializer) WriteString(str string, lenType SeriLengthPrefixType, errProducer ErrProducer) *Serializer {
if s.err != nil {
return s
}
_ = s.writeSliceLength(len(str), lenType, errProducer)
if s.err != nil {
return s
}
if _, err := s.buf.Write([]byte(str)); err != nil {
s.err = errProducer(err)
}
return s
}
// NewDeserializer creates a new Deserializer.
func NewDeserializer(src []byte) *Deserializer {
return &Deserializer{src: src}
}
// Deserializer is a utility to deserialize bytes.
type Deserializer struct {
src []byte
offset int
err error
}
// Skip skips the number of bytes during deserialization.
func (d *Deserializer) Skip(skip int, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
if len(d.src) < skip {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
d.offset += skip
d.src = d.src[skip:]
return d
}
// ReadBool reads a bool into dest.
func (d *Deserializer) ReadBool(dest *bool, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
if len(d.src) == 0 {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
switch d.src[0] {
case 0:
*dest = false
case 1:
*dest = true
default:
d.err = errProducer(ErrDeserializationInvalidBoolValue)
return d
}
d.offset += OneByte
d.src = d.src[OneByte:]
return d
}
// ReadByte reads a byte into dest.
func (d *Deserializer) ReadByte(dest *byte, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
if len(d.src) == 0 {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
*dest = d.src[0]
d.offset += OneByte
d.src = d.src[OneByte:]
return d
}
// ReadNum reads a number into dest.
func (d *Deserializer) ReadNum(dest interface{}, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
l := len(d.src)
switch x := dest.(type) {
case *uint8:
if l < OneByte {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
l = OneByte
*x = d.src[0]
case *uint16:
if l < UInt16ByteSize {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
l = UInt16ByteSize
*x = binary.LittleEndian.Uint16(d.src[:UInt16ByteSize])
case *uint32:
if l < UInt32ByteSize {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
l = UInt32ByteSize
*x = binary.LittleEndian.Uint32(d.src[:UInt32ByteSize])
case *uint64:
if l < UInt64ByteSize {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
l = UInt64ByteSize
*x = binary.LittleEndian.Uint64(d.src[:UInt64ByteSize])
default:
panic(fmt.Sprintf("unsupported ReadNum type %T", dest))
}
d.offset += l
d.src = d.src[l:]
return d
}
// ReadBytes reads specified number of bytes.
// Use this function only to read fixed size slices/arrays, otherwise
// use ReadVariableByteSlice instead.
func (d *Deserializer) ReadBytes(slice *[]byte, numBytes int, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
dest := make([]byte, numBytes)
if len(d.src) < numBytes {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
copy(dest, d.src[:numBytes])
*slice = dest
d.offset += numBytes
d.src = d.src[numBytes:]
return d
}
// ReadVariableByteSlice reads a variable byte slice which is denoted by the given SeriLengthPrefixType.
func (d *Deserializer) ReadVariableByteSlice(slice *[]byte, lenType SeriLengthPrefixType, errProducer ErrProducer, maxRead ...int) *Deserializer {
if d.err != nil {
return d
}
sliceLength, err := d.readSliceLength(lenType, errProducer)
if err != nil {
d.err = err
return d
}
if len(maxRead) > 0 && sliceLength > maxRead[0] {
d.err = errProducer(fmt.Errorf("%w: denoted %d bytes, max allowed %d ", ErrDeserializationLengthInvalid, sliceLength, maxRead[0]))
return d
}
dest := make([]byte, sliceLength)
if len(d.src) < sliceLength {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
copy(dest, d.src[:sliceLength])
*slice = dest
d.offset += sliceLength
d.src = d.src[sliceLength:]
return d
}
// ReadArrayOf32Bytes reads an array of 32 bytes.
func (d *Deserializer) ReadArrayOf32Bytes(arr *ArrayOf32Bytes, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
const length = 32
l := len(d.src)
if l < length {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
copy(arr[:], d.src[:length])
d.offset += length
d.src = d.src[length:]
return d
}
// ReadArrayOf64Bytes reads an array of 64 bytes.
func (d *Deserializer) ReadArrayOf64Bytes(arr *ArrayOf64Bytes, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
const length = 64
l := len(d.src)
if l < length {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
copy(arr[:], d.src[:length])
d.offset += length
d.src = d.src[length:]
return d
}
// ReadArrayOf49Bytes reads an array of 49 bytes.
func (d *Deserializer) ReadArrayOf49Bytes(arr *ArrayOf49Bytes, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
const length = 49
l := len(d.src)
if l < length {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
copy(arr[:], d.src[:length])
d.offset += length
d.src = d.src[length:]
return d
}
// reads the length of a slice.
func (d *Deserializer) readSliceLength(lenType SeriLengthPrefixType, errProducer ErrProducer) (int, error) {
l := len(d.src)
var sliceLength int
switch lenType {
case SeriLengthPrefixTypeAsByte:
if l < OneByte {
return 0, errProducer(ErrDeserializationNotEnoughData)
}
l = OneByte
sliceLength = int(d.src[0])
case SeriLengthPrefixTypeAsUint16:
if l < UInt16ByteSize {
return 0, errProducer(ErrDeserializationNotEnoughData)
}
l = UInt16ByteSize
sliceLength = int(binary.LittleEndian.Uint16(d.src[:UInt16ByteSize]))
case SeriLengthPrefixTypeAsUint32:
if l < UInt32ByteSize {
return 0, errProducer(ErrDeserializationNotEnoughData)
}
l = UInt32ByteSize
sliceLength = int(binary.LittleEndian.Uint32(d.src[:UInt32ByteSize]))
default:
panic(fmt.Sprintf("unknown slice length type %v", lenType))
}
d.offset += l
d.src = d.src[l:]
return sliceLength, nil
}
// ReadSliceOfArraysOf32Bytes reads a slice of arrays of 32 bytes.
func (d *Deserializer) ReadSliceOfArraysOf32Bytes(slice *SliceOfArraysOf32Bytes, deSeriMode DeSerializationMode, lenType SeriLengthPrefixType, arrayRules *ArrayRules, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
const length = 32
sliceLength, err := d.readSliceLength(lenType, errProducer)
if err != nil {
d.err = err
return d
}
var arrayElementValidator ElementValidationFunc
if arrayRules != nil && deSeriMode.HasMode(DeSeriModePerformValidation) {
if err := arrayRules.CheckBounds(uint(sliceLength)); err != nil {
d.err = errProducer(err)
return d
}
arrayElementValidator = arrayRules.ElementValidationFunc(arrayRules.ValidationMode)
}
s := make(SliceOfArraysOf32Bytes, sliceLength)
for i := 0; i < sliceLength; i++ {
if len(d.src) < length {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
if arrayElementValidator != nil {
if err := arrayElementValidator(i, d.src[:length]); err != nil {
d.err = errProducer(err)
return d
}
}
copy(s[i][:], d.src[:length])
d.offset += length
d.src = d.src[length:]
}
*slice = s
return d
}
// ReadSliceOfArraysOf64Bytes reads a slice of arrays of 64 bytes.
func (d *Deserializer) ReadSliceOfArraysOf64Bytes(slice *SliceOfArraysOf64Bytes, deSeriMode DeSerializationMode, lenType SeriLengthPrefixType, arrayRules *ArrayRules, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
const length = 64
sliceLength, err := d.readSliceLength(lenType, errProducer)
if err != nil {
d.err = err
return d
}
var arrayElementValidator ElementValidationFunc
if arrayRules != nil && deSeriMode.HasMode(DeSeriModePerformValidation) {
if err := arrayRules.CheckBounds(uint(sliceLength)); err != nil {
d.err = errProducer(err)
return d
}
arrayElementValidator = arrayRules.ElementValidationFunc(arrayRules.ValidationMode)
}
s := make(SliceOfArraysOf64Bytes, sliceLength)
for i := 0; i < sliceLength; i++ {
if len(d.src) < length {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
if arrayElementValidator != nil {
if err := arrayElementValidator(i, d.src[:length]); err != nil {
d.err = errProducer(err)
return d
}
}
copy(s[i][:], d.src[:length])
d.offset += length
d.src = d.src[length:]
}
*slice = s
return d
}
// ReadObject reads an object, using the given SerializableSelectorFunc.
func (d *Deserializer) ReadObject(f ReadObjectConsumerFunc, deSeriMode DeSerializationMode, typeDen TypeDenotationType, serSel SerializableSelectorFunc, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
l := len(d.src)
var ty uint32
switch typeDen {
case TypeDenotationUint32:
if l < UInt32ByteSize {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
ty = binary.LittleEndian.Uint32(d.src)
case TypeDenotationByte:
if l < OneByte {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
ty = uint32(d.src[0])
case TypeDenotationNone:
// object has no type denotation
}
seri, err := serSel(ty)
if err != nil {
d.err = errProducer(err)
return d
}
bytesConsumed, err := seri.Deserialize(d.src, deSeriMode)
if err != nil {
d.err = errProducer(err)
return d
}
d.offset += bytesConsumed
d.src = d.src[bytesConsumed:]
f(seri)
return d
}
// ReadSliceOfObjects reads a slice of objects.
func (d *Deserializer) ReadSliceOfObjects(f ReadObjectsConsumerFunc, deSeriMode DeSerializationMode, lenType SeriLengthPrefixType, typeDen TypeDenotationType, serSel SerializableSelectorFunc, arrayRules *ArrayRules, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
sliceLength, err := d.readSliceLength(lenType, errProducer)
if err != nil {
d.err = err
return d
}
var arrayElementValidator ElementValidationFunc
if arrayRules != nil && deSeriMode.HasMode(DeSeriModePerformValidation) {
if err := arrayRules.CheckBounds(uint(sliceLength)); err != nil {
d.err = errProducer(err)
return d
}
arrayElementValidator = arrayRules.ElementValidationFunc(arrayRules.ValidationMode)
}
var seris Serializables
for i := 0; i < int(sliceLength); i++ {
// remember where we were before reading the object
srcBefore := d.src
offsetBefore := d.offset
var seri Serializable
// this mutates d.src/d.offset
d.ReadObject(func(readSeri Serializable) { seri = readSeri }, deSeriMode, typeDen, serSel, func(err error) error {
return errProducer(err)
})
// there was an error
if seri == nil {
return d
}
bytesConsumed := d.offset - offsetBefore
if arrayElementValidator != nil {
if err := arrayElementValidator(i, srcBefore[:bytesConsumed]); err != nil {
d.err = errProducer(err)
return d
}
}
seris = append(seris, seri)
}
f(seris)
return d
}
// ReadTime reads a Time value from the internal buffer.
func (d *Deserializer) ReadTime(dest *time.Time, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
l := len(d.src)
if l < Int64ByteSize {
d.err = errProducer(ErrDeserializationNotEnoughData)
return d
}
l = Int64ByteSize
nanoSeconds := int64(binary.LittleEndian.Uint64(d.src[:Int64ByteSize]))
if nanoSeconds == 0 {
*dest = time.Time{}
} else {
*dest = time.Unix(0, nanoSeconds)
}
d.offset += l
d.src = d.src[l:]
return d
}
// ReadPayload reads a payload.
func (d *Deserializer) ReadPayload(f ReadObjectConsumerFunc, deSeriMode DeSerializationMode, sel SerializableSelectorFunc, errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
if len(d.src) < PayloadLengthByteSize {
d.err = errProducer(fmt.Errorf("%w: data is smaller than payload length denotation", ErrDeserializationNotEnoughData))
return d
}
payloadLength := binary.LittleEndian.Uint32(d.src)
d.offset += PayloadLengthByteSize
d.src = d.src[PayloadLengthByteSize:]
// nothing to do
if payloadLength == 0 {
return d
}
switch {
case len(d.src) < MinPayloadByteSize:
d.err = errProducer(fmt.Errorf("%w: payload data is smaller than min. required length %d", ErrDeserializationNotEnoughData, MinPayloadByteSize))
return d
case len(d.src) < int(payloadLength):
d.err = errProducer(fmt.Errorf("%w: payload length denotes more bytes than are available", ErrDeserializationNotEnoughData))
return d
}
payload, err := sel(binary.LittleEndian.Uint32(d.src))
if err != nil {
d.err = errProducer(err)
return d
}
payloadBytesConsumed, err := payload.Deserialize(d.src, deSeriMode)
if err != nil {
d.err = errProducer(err)
return d
}
if payloadBytesConsumed != int(payloadLength) {
d.err = errProducer(fmt.Errorf("%w: denoted payload length (%d) doesn't equal the size of deserialized payload (%d)", ErrInvalidBytes, payloadLength, payloadBytesConsumed))
return d
}
d.offset += payloadBytesConsumed
d.src = d.src[payloadBytesConsumed:]
f(payload)
return d
}
// ReadString reads a string.
func (d *Deserializer) ReadString(s *string, lenType SeriLengthPrefixType, errProducer ErrProducer, maxSize ...int) *Deserializer {
if d.err != nil {
return d
}
strLen, err := d.readSliceLength(lenType, errProducer)
if err != nil {
d.err = err
return d
}
if len(maxSize) > 0 && strLen > maxSize[0] {
d.err = errProducer(fmt.Errorf("%w: string defined to be of %d bytes length but max %d is allowed", ErrDeserializationLengthInvalid, strLen, maxSize[0]))
}
if len(d.src) < int(strLen) {
d.err = errProducer(fmt.Errorf("%w: data is smaller than (%d) denoted string length of %d", ErrDeserializationNotEnoughData, len(d.src), strLen))
return d
}
*s = string(d.src[:strLen])
d.offset += int(strLen)
d.src = d.src[strLen:]
return d
}
// AbortIf calls the given ErrProducer if the Deserializer did not encounter an error yet.
// Return nil from the ErrProducer to indicate continuation of the deserialization.
func (d *Deserializer) AbortIf(errProducer ErrProducer) *Deserializer {
if d.err != nil {
return d
}
if err := errProducer(nil); err != nil {
d.err = err
}
return d
}