On 05/28/2018, at 11:59, fgf <[email protected] <mailto:[email protected]>>
wrote:
> I have a very large file (a 20 MB Thunderbird .mbox mail file) which contains
> many base64 sections interleaved in the text.
>
> I want to decode in-line the base64 sections back into readable text while
> keeping the non-base64 text.
>
> I made a Find pattern to select the base64 sections:
Hey There,
You could do something like this with AppleScript.
----------------------------------------------------------------
# Auth: Christopher Stone
# dCre: 2018/05/29 15:00
# dMod: 2018/05/29 15:00
# Appl: BBEdit
# Task: Decode Base64 Segments in front document.
# Libs: None
# Osax: None
# Tags: @Applescript, @Script, @BBEdit, @Decode, @Base64, @Segments, @Front,
@Document
----------------------------------------------------------------
set itemFound to true
tell application "BBEdit"
tell front text window's text
select insertion point before character 1
repeat while itemFound
set findRecord to find "(^[0-9a-zA-z+/]{76}\\r)+.*\\r" options
{search mode:grep, case sensitive:false}
if found of findRecord ≠ true then
set itemFound to false
else
select found object of findRecord
set dataStr to contents of text of found object of findRecord
set decodedStr to decodeBase64(dataStr) of me
if decodedStr ≠ dataStr then set contents of selection to
decodedStr
end if
end repeat
end tell
end tell
----------------------------------------------------------------
--» HANDLERS
----------------------------------------------------------------
on decodeBase64(dataStr)
set shCMD to "
base64 -D <<< " & quoted form of dataStr
do shell script shCMD
end decodeBase64
----------------------------------------------------------------
It will take your regex pattern, find the next match, transform it, and repeat
until done.
You can run it from the Apple Script Editor.app, or BBEdit's script menu.
On a 20 MB file it will probably take quite a while to run.
I am concerned that some of your base64 blocks will be embedded images or
files, so you may end up with some gibberish in the decoded material.
If I was doing this on any regular basis I'd take a careful look at this:
https://perldoc.perl.org/MIME/Base64.html
<https://perldoc.perl.org/MIME/Base64.html>
It works well for simple cases, unfortunately I don't know offhand how to make
it work in a big file with interspersed base64 sections.
Even so – someone has done this job before – and some research ought to bear
fruit.
--
Best Regards,
Chris
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