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package multibase
import (
"fmt"
"unicode/utf8"
)
// Encoder is a multibase encoding that is verified to be supported and
// supports an Encode method that does not return an error
type Encoder struct {
enc Encoding
}
// NewEncoder create a new Encoder from an Encoding
func NewEncoder(base Encoding) (Encoder, error) {
_, ok := EncodingToStr[base]
if !ok {
return Encoder{-1}, fmt.Errorf("unsupported multibase encoding: %d", base)
}
return Encoder{base}, nil
}
// MustNewEncoder is like NewEncoder but will panic if the encoding is
// invalid.
func MustNewEncoder(base Encoding) Encoder {
_, ok := EncodingToStr[base]
if !ok {
panic("Unsupported multibase encoding")
}
return Encoder{base}
}
// EncoderByName creates an encoder from a string, the string can
// either be the multibase name or single character multibase prefix
func EncoderByName(str string) (Encoder, error) {
var base Encoding
var ok bool
if len(str) == 0 {
return Encoder{-1}, fmt.Errorf("empty multibase encoding")
} else if utf8.RuneCountInString(str) == 1 {
r, _ := utf8.DecodeRuneInString(str)
base = Encoding(r)
_, ok = EncodingToStr[base]
} else {
base, ok = Encodings[str]
}
if !ok {
return Encoder{-1}, fmt.Errorf("unsupported multibase encoding: %s", str)
}
return Encoder{base}, nil
}
func (p Encoder) Encoding() Encoding {
return p.enc
}
// Encode encodes the multibase using the given Encoder.
func (p Encoder) Encode(data []byte) string {
str, err := Encode(p.enc, data)
if err != nil {
// should not happen
panic(err)
}
return str
}
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