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Posted to dev@commons.apache.org by Gary Gregory <ga...@gmail.com> on 2021/06/25 11:58:26 UTC
[Codec] Base45
Base45 anyone ;-)
https://datatracker.ietf.org/doc/draft-faltstrom-base45/
Gary
Re: [Codec] Base45
Posted by sebb <se...@gmail.com>.
AFAICT it's possible for one or two spaces to appear at the start of
an encoded string.
(Spaces cannot appear at the end)
This won't matter if the encoding is only ever converted into a QR code.
But it seems a strange choice to allow spaces ...
On Fri, 25 Jun 2021 at 17:17, Bernd Eckenfels <ec...@zusammenkunft.net> wrote:
>
> Hm I Wonder why it does not reserve a char (especially space) for separation, but besides that it is a good case to optimize for QR (only bad thing that most readers would need an url scheme to route it to a handler app. Maybe wait till somebody implements a protocol with it?
>
> --
> https://Bernd.eckenfels.net
> ________________________________
> From: Gary Gregory <ga...@gmail.com>
> Sent: Friday, June 25, 2021 1:58:26 PM
> To: Commons Developers List <de...@commons.apache.org>
> Subject: [Codec] Base45
>
> Base45 anyone ;-)
>
> https://datatracker.ietf.org/doc/draft-faltstrom-base45/
>
> Gary
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Re: [Codec] Base45
Posted by Bernd Eckenfels <ec...@zusammenkunft.net>.
Hm I Wonder why it does not reserve a char (especially space) for separation, but besides that it is a good case to optimize for QR (only bad thing that most readers would need an url scheme to route it to a handler app. Maybe wait till somebody implements a protocol with it?
--
https://Bernd.eckenfels.net
________________________________
From: Gary Gregory <ga...@gmail.com>
Sent: Friday, June 25, 2021 1:58:26 PM
To: Commons Developers List <de...@commons.apache.org>
Subject: [Codec] Base45
Base45 anyone ;-)
https://datatracker.ietf.org/doc/draft-faltstrom-base45/
Gary
Re: [Codec] Base45
Posted by Dirk-Willem van Gulik <di...@webweaving.org>.
My bad - done. By the way - in the Branch ‘tight-nc’ is also a variation which is in common use in the blockchain/bitcoin community. It requires BigNum - but is slightly more compact.
Dw
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Re: [Codec] Base45
Posted by Gary Gregory <ga...@gmail.com>.
Ping?
On Fri, Jun 25, 2021, 14:50 Gary Gregory <ga...@gmail.com> wrote:
> The simlest would be to make the Java file have the Apache 2 license
> header.
>
> Gary
>
> On Fri, Jun 25, 2021, 14:34 Dirk-Willem van Gulik <di...@webweaving.org>
> wrote:
>
>> On 25 Jun 2021, at 20:10, Bernd Eckenfels <ec...@zusammenkunft.net> wrote:
>>
>> > I asked the authors if they can share background info or want to
>> contribute a implementation here.
>>
>> Feel free to raid this version:
>>
>> https://github.com/ehn-dcc-development/base45-java
>>
>> and happy to make sure there is a softwaregrant/license change if needed.
>> We also have a variation of this Base45 which is more efficient (and like
>> the one used by the bitcoin community):
>>
>>
>> https://github.com/dirkx/base45tight-ng/blob/main/src/org/webweaving/Base45.java
>>
>> which because of time contraints did not make it into the European
>> Digital Corona Certificate. But they would be a bit more efficient longer
>> term.
>>
>> Dw
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>> To unsubscribe, e-mail: dev-unsubscribe@commons.apache.org
>> For additional commands, e-mail: dev-help@commons.apache.org
>>
>>
Re: [Codec] Base45
Posted by Gary Gregory <ga...@gmail.com>.
The simlest would be to make the Java file have the Apache 2 license header.
Gary
On Fri, Jun 25, 2021, 14:34 Dirk-Willem van Gulik <di...@webweaving.org>
wrote:
> On 25 Jun 2021, at 20:10, Bernd Eckenfels <ec...@zusammenkunft.net> wrote:
>
> > I asked the authors if they can share background info or want to
> contribute a implementation here.
>
> Feel free to raid this version:
>
> https://github.com/ehn-dcc-development/base45-java
>
> and happy to make sure there is a softwaregrant/license change if needed.
> We also have a variation of this Base45 which is more efficient (and like
> the one used by the bitcoin community):
>
>
> https://github.com/dirkx/base45tight-ng/blob/main/src/org/webweaving/Base45.java
>
> which because of time contraints did not make it into the European Digital
> Corona Certificate. But they would be a bit more efficient longer term.
>
> Dw
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: dev-unsubscribe@commons.apache.org
> For additional commands, e-mail: dev-help@commons.apache.org
>
>
Re: [Codec] Base45
Posted by Dirk-Willem van Gulik <di...@webweaving.org>.
On 25 Jun 2021, at 20:10, Bernd Eckenfels <ec...@zusammenkunft.net> wrote:
> I asked the authors if they can share background info or want to contribute a implementation here.
Feel free to raid this version:
https://github.com/ehn-dcc-development/base45-java
and happy to make sure there is a softwaregrant/license change if needed. We also have a variation of this Base45 which is more efficient (and like the one used by the bitcoin community):
https://github.com/dirkx/base45tight-ng/blob/main/src/org/webweaving/Base45.java
which because of time contraints did not make it into the European Digital Corona Certificate. But they would be a bit more efficient longer term.
Dw
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Re: [Codec] Base45
Posted by Bernd Eckenfels <ec...@zusammenkunft.net>.
Hello,
I asked the authors if they can share background info or want to contribute a implementation here.
Gruß
Bernd
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https://Bernd.eckenfels.net