## Expand description

Decoding and encoding of Base 16 a.k.a. hex digits.

The Base 16 encoding is defined in RFC 4648. It really is just a normal hex-encoding using the (case-insensitive) letters ‘A’ to ‘F’ as additional values for the digits.

The module defines the type `Decoder`

which keeps the state necessary
for decoding. The various functions offered use such a decoder to decode
and encode octets in various forms.

## Re-exports

`pub use super::base64::DecodeError;`

## Structs

- A Base 16 decoder.
- A Base 16 decoder that can be used as a converter for a scanner.

## Functions

- Decodes a string with Base 16 encoded data.
- Decodes a string with Base 16 data and returns it as a vec.
- Encodes binary data in Base 16 and writes it into a format stream.
- Returns a placeholder value that implements
`Display`

for encoded data. - Encodes binary data in Base 16 and returns the encoded data as a string.