From: Max Chernoff via ntg-context <ntg-context@ntg.nl>
To: ntg-context@ntg.nl
Cc: Max Chernoff <mseven@telus.net>, oinos@gmx.es
Subject: Re: new hash for buffer (as file)
Date: Thu, 22 Sep 2022 22:01:25 -0600 [thread overview]
Message-ID: <6ebdfae4256fb8b52e941e66ced7a5e7f4b016f8.camel@telus.net> (raw)
In-Reply-To: <1e089d8f-2503-d06d-57af-c5ac60256596@gmx.es>
Hi Pablo,
> I mean, to get hash of the file attached to the document, I need to save
> the buffer for "context(utilities.sha2.hash256(io.loaddata(buffer)))".
>
> But I don’t need to save the buffer to attach it to the PDF document.
>
> My question is how to define \shabufferfile to avoid \savebuffer (only
> required to get the hash).
The SHA calculation isn't working properly because of a weird newline
issue. Try this:
\setupinteraction[state=start]
\setupinteractionscreen[option={attachment}]
\startbuffer[test]
just a test
and another one
\stopbuffer
\starttext
\startluacode
require("util-sha")
function sha256(str)
return utilities.sha2.hash256(
str:gsub(string.char(0x0D), string.char(0x0A))
)
end
\stopluacode
\def\shabuffer#1%
{\cldcontext{sha256(buffers.raw("#1"))}}
\def\shafile#1%
{\cldcontext{sha256(io.loaddata("#1"))}}
\shabuffer{test}
\savebuffer[test][temporary-αβγ, prefix=no]
\shafile{temporary-αβγ}
\attachment[buffer=test, name=\shabuffer{test}, method=hidden]
\stoptext
You can remove the "\savebuffer" and the "\shafile"; I just kept that in to
show that the two hashes are now the same.
-- Max
>
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next prev parent reply other threads:[~2022-09-23 4:01 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-22 17:25 Pablo Rodriguez via ntg-context
2022-09-23 4:01 ` Max Chernoff via ntg-context [this message]
2022-09-23 15:06 ` Pablo Rodriguez via ntg-context
2022-09-25 17:59 ` Pablo Rodriguez via ntg-context
2022-09-26 0:05 ` Max Chernoff via ntg-context
2022-09-26 8:47 ` Hans Hagen via ntg-context
2022-09-26 23:01 ` Max Chernoff via ntg-context
2022-09-26 17:24 ` Pablo Rodriguez via ntg-context
2022-09-26 18:07 ` Hans Hagen via ntg-context
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