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bytedecoder.go
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/
bytedecoder.go
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//
// Copyright 2019 Insolar Technologies GmbH
//
// 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 reference
import (
"encoding/base64"
"io"
"github.com/jbenet/go-base58"
"github.com/pkg/errors"
)
type ByteDecoderFactory interface {
GetByteDecoder(encodingName string) ByteDecodeFunc
DefaultDecoder() ByteDecodeFunc
LegacyDecoder() ByteDecodeFunc
}
type byteDecoderFactory struct {
decoders map[string]ByteDecodeFunc
}
func byteDecodeBase58(s string, target io.ByteWriter) (stringRead int, err error) {
bytes := base58.Decode(s)
if len(s) > 0 && len(bytes) == 0 {
return 0, errors.New("input string contains bad charachters")
}
for _, b := range bytes {
err := target.WriteByte(b)
if err != nil {
return 0, errors.Wrap(err, "failed to write byte")
}
}
return len(s), nil
}
func byteDecodeBase64(s string, target io.ByteWriter) (stringRead int, err error) {
bytes, err := base64.URLEncoding.DecodeString(s)
if err != nil {
return 0, err
}
for _, b := range bytes {
err := target.WriteByte(b)
if err != nil {
return 0, errors.Wrap(err, "failed to write byte")
}
}
return len(s), nil
}
func NewByteDecoderFactory() ByteDecoderFactory {
return &byteDecoderFactory{
decoders: map[string]ByteDecodeFunc{
"base58": byteDecodeBase58,
"base64": byteDecodeBase64,
},
}
}
func (f *byteDecoderFactory) GetByteDecoder(encodingName string) ByteDecodeFunc {
return f.decoders[encodingName]
}
func (f *byteDecoderFactory) DefaultDecoder() ByteDecodeFunc {
return f.decoders["base58"]
}
func (f *byteDecoderFactory) LegacyDecoder() ByteDecodeFunc {
return f.decoders["base58"]
}