package encoding/base32
DecodedLen returns the maximum length in bytes of the decoded data corresponding to n bytes of base32-encoded data.
Golang encoding/base32.Encoding.DecodedLen function usage example
func packBase32(s []byte) ([]byte, error) {
b32len := base32.HexEncoding.DecodedLen(len(s)) // <---- DecodedLen()
buf := make([]byte, b32len)
n, err := base32.HexEncoding.Decode(buf, []byte(s))
if err != nil {
return nil, err
}
buf = buf[:n]
return buf, nil
}
References :
http://golang.org/pkg/encoding/base32/#Encoding.DecodedLen
https://github.com/miekg/dns/blob/master/msg.go
