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serialize.go
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serialize.go
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// Copyright (c) 2019 Chair of Applied Cryptography, Technische Universit盲t
// Darmstadt, Germany. All rights reserved. This file is part of go-perun. Use
// of this source code is governed by a MIT-style license that can be found in
// the LICENSE file.
package wire
import (
"encoding/binary"
"io"
"math/big"
"time"
"github.com/pkg/errors"
"perun.network/go-perun/log"
pio "perun.network/go-perun/pkg/io"
)
var byteOrder = binary.LittleEndian
// Encode encodes multiple primitive values into a writer.
// All passed values must be copies, not references.
func Encode(writer io.Writer, values ...interface{}) (err error) {
for i, value := range values {
switch v := value.(type) {
case bool, int8, uint8, int16, uint16, int32, uint32, int64, uint64:
err = binary.Write(writer, byteOrder, v)
case time.Time:
err = binary.Write(writer, byteOrder, v.UnixNano())
case *big.Int:
err = BigInt{v}.Encode(writer)
case [32]byte:
_, err = writer.Write(v[:])
case []byte:
err = ByteSlice(v).Encode(writer)
case string:
err = encodeString(writer, v)
default:
if enc, ok := value.(pio.Encoder); ok {
err = enc.Encode(writer)
} else {
log.Panicf("wire.Encode(): Invalid type %T", v)
}
}
if err != nil {
return errors.WithMessagef(err, "failed to encode %dth value of type %T", i, value)
}
}
return nil
}
// Decode decodes multiple primitive values from a reader.
// All passed values must be references, not copies.
func Decode(reader io.Reader, values ...interface{}) (err error) {
for i, value := range values {
switch v := value.(type) {
case *bool, *int8, *uint8, *int16, *uint16, *int32, *uint32, *int64, *uint64:
err = binary.Read(reader, byteOrder, v)
case *time.Time:
var nsec int64
err = binary.Read(reader, byteOrder, &nsec)
*v = time.Unix(0, nsec)
case **big.Int:
var d BigInt
err = d.Decode(reader)
*v = d.Int
case *[32]byte:
_, err = io.ReadFull(reader, v[:])
case *[]byte:
d := ByteSlice(*v)
err = d.Decode(reader)
case *string:
err = decodeString(reader, v)
default:
if dec, ok := value.(pio.Decoder); ok {
err = dec.Decode(reader)
} else {
log.Panicf("wire.Decode(): Invalid type %T", v)
}
}
if err != nil {
return errors.WithMessagef(err, "failed to decode %dth value of type %T", i, value)
}
}
return nil
}