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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package internal contains code that is shared among encoding implementations.
package internal
import (
// Encoding is an implementation of the Encoding interface that adds the String
// and ID methods to an existing encoding.
type Encoding struct {
Name string
MIB identifier.MIB
// _ verifies that Encoding implements identifier.Interface.
var _ identifier.Interface = (*Encoding)(nil)
func (e *Encoding) String() string {
return e.Name
func (e *Encoding) ID() (mib identifier.MIB, other string) {
return e.MIB, ""
// SimpleEncoding is an Encoding that combines two Transformers.
type SimpleEncoding struct {
Decoder transform.Transformer
Encoder transform.Transformer
func (e *SimpleEncoding) NewDecoder() *encoding.Decoder {
return &encoding.Decoder{Transformer: e.Decoder}
func (e *SimpleEncoding) NewEncoder() *encoding.Encoder {
return &encoding.Encoder{Transformer: e.Encoder}
// FuncEncoding is an Encoding that combines two functions returning a new
// Transformer.
type FuncEncoding struct {
Decoder func() transform.Transformer
Encoder func() transform.Transformer
func (e FuncEncoding) NewDecoder() *encoding.Decoder {
return &encoding.Decoder{Transformer: e.Decoder()}
func (e FuncEncoding) NewEncoder() *encoding.Encoder {
return &encoding.Encoder{Transformer: e.Encoder()}
// A RepertoireError indicates a rune is not in the repertoire of a destination
// encoding. It is associated with an encoding-specific suggested replacement
// byte.
type RepertoireError byte
// Error implements the error interrface.
func (r RepertoireError) Error() string {
return "encoding: rune not supported by encoding."
// Replacement returns the replacement string associated with this error.
func (r RepertoireError) Replacement() byte { return byte(r) }
var ErrASCIIReplacement = RepertoireError(encoding.ASCIISub)