Charsets for hex/base64

[Jonas Konrad]

Well technically there is some sort of precedent to this, since 
CharsetEncoder/Decoder operate on CharBuffers which are just utf-16 
encoded strings. So charsets already may produce a single output code 
*unit* for multiple input code units (UTF-32, which may output 1 code 
unit for 2 UTF-16 input code units / chars). Of course, consuming 
multiple code points would be new but code points aren't really part of 
the CharBuffer api.

- Jonas

On 05/02/2018 05:29 PM, Weijun Wang wrote:
> 
> 
>> On May 2, 2018, at 4:35 PM, Jonas Konrad <me at yawk.at> wrote:
>>
>> "0a0b0c".getBytes(HexCharset.getInstance()) = new byte[] { 0x0a, 0x0b, 0x0c }
>> new String(new byte[] { 0x0a, 0x0b, 0x0c }, HexCharset.getInstance()) = "0a0b0c"
> 
> Normally a charset is to encode a string to byte[], but here you can actually decoding a string to byte[]. This would lead to quite some concept differences.
> 
> For example, we can say if a char is encodable for a charset, but for the HEX "charset", you will have to say what combination of chars is "encodable".
> 
> --Max
>