Re: [guile-email] slow parse of email with huge attachment

[Arun Isaac <arunisaac@systemreboot.net>]

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Hi,

I've made some improvements. I got the following snippet down from
around 16s to 6s.

--8<---------------cut here---------------start------------->8---
(statprof (lambda ()
            (map parse-email
                 (call-with-input-file "large-base64-attachment.mbox"
                   mbox->emails))))
--8<---------------cut here---------------end--------------->8---

Specifically, I made the following improvements to guile-email.

- I rewrote the base64 decoder from scratch to be a little
  faster. Earlier, I was using the decoder I had copied from Guix.
- I eliminated several unneccessary bytevector<->string conversions.
- I rewrote read-bytes-till in (email utils) to process multiple bytes
  at a time, instead of byte by byte.

There is still scope for improvement, but do test and let me know if
this serves your purpose for now. Also, I am curious to see your new
benchmark of parse-email to compare with the 8s you reported earlier.

Cheers!

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