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types.go
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112 lines (98 loc) · 2.92 KB
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// 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 types contains basic types that are used in The Things Network's protobuf messages.
package types
import (
"bytes"
"encoding/hex"
"go.thethings.network/lorawan-stack/v3/pkg/errors"
)
// Interface all types in pkg/types must implement.
type Interface interface {
IsZero() bool
String() string
GoString() string
Size() int
Marshal() ([]byte, error)
MarshalTo(data []byte) (int, error)
Unmarshal(data []byte) error
MarshalJSON() ([]byte, error)
UnmarshalJSON(data []byte) error
MarshalBinary() ([]byte, error)
UnmarshalBinary(data []byte) error
MarshalText() ([]byte, error)
UnmarshalText(data []byte) error
}
var (
errScanArgumentType = errors.DefineInternal("src_type", "invalid type for src") // DB schema problem.
errInvalidJSON = errors.DefineInvalidArgument("invalid_json", "invalid JSON: `{json}`")
errInvalidLength = errors.DefineInvalidArgument("invalid_length", "invalid slice length")
)
func marshalJSONHexBytes(data []byte) ([]byte, error) {
hexData, err := marshalTextBytes(data)
if err != nil {
return nil, err
}
b := []byte{'"'}
b = append(b, hexData...)
return append(b, '"'), nil
}
func unmarshalJSONHexBytes(dst, data []byte) error {
if string(data) == `""` {
return nil
}
if len(data) < 2 || data[0] != '"' || data[len(data)-1] != '"' {
return errInvalidJSON.WithAttributes("json", string(data))
}
return unmarshalTextBytes(dst, data[1:len(data)-1])
}
func marshalTextBytes(data []byte) ([]byte, error) {
b := make([]byte, hex.EncodedLen(len(data)))
hex.Encode(b, data)
return bytes.ToUpper(b), nil
}
func unmarshalTextBytes(dst, data []byte) error {
if len(data) == 0 {
return nil
}
b := make([]byte, hex.DecodedLen(len(data)))
n, err := hex.Decode(b, data)
if err != nil {
return err
}
if n != len(dst) || copy(dst, b) != len(dst) {
return errInvalidLength.New()
}
return nil
}
func marshalBinaryBytes(data []byte) ([]byte, error) {
b := make([]byte, len(data))
copy(b, data)
return b, nil
}
func marshalBinaryBytesTo(dst, src []byte) (int, error) {
if len(dst) < len(src) {
return 0, errInvalidLength.New()
}
return copy(dst, src), nil
}
func unmarshalBinaryBytes(dst, data []byte) error {
if len(data) == 0 {
return nil
}
if len(data) != len(dst) || copy(dst[:], data) != len(dst) {
return errInvalidLength.New()
}
return nil
}