[Solved] Reading "serialize" data from the .rpp project file using python ?

iMisspell · 04-07-2024, 04:34 PM

How do you read "serialize" data from the .rpp project file from python ?

Trying to read data from the .rpp project file which JS Notepad has saved to.
Tale's JS-Notepad code https://forums.cockos.com/showpost.p...2&postcount=15

Here's what im trying to read:

Code:

      <JS_SER
        AACcQk4AAABwLWJhc3MsIHJvdW5kIHdvdW5kcywgbG93IHBpY2t1cHMsIHZvbCBhbmQgdG9uZSAxMDAgJiBuYXBraW4gYXQgYnJpZGdlIHRvIG11dGVIvw==
      >

The closest ive come is with the following:
Open the file with...

Code:

with open(reaper_rpp_file, 'r') as content_file:
    reaper_content = content_file.read()

get the chunk of data i want from '<JS_SER'
pass that though

Code:

            decoded = base64.b64decode(str_JS_SER)
            decoded = decoded.decode('cp1258')

which gets close, but there's still other bytes, beginning and end of the string which are not the correct text.

Ive tried different encode's, cp1258 seams to work the best, also tried with skipping errors, but still do not get the correct results.

Code:

decoded = decoded.decode('utf-8', errors='ignore')

the results im getting...

Code:

œBNp-bass, round wounds, low pickups, vol and tone 100 & napkin at bridge to muteH¿
and
¶B&white - round wounds, vol 85, tone 950 a

should be

Code:

p-bass, round wounds, low pickups, vol and tone 100 & napkin at bridge to mute
and
white - round wounds, vol 85, tone 95

Im a bit new to the coding side of reaper, so any help would be great.
Thanks...

_

cfillion · 04-07-2024, 08:03 PM

Code:

@serialize
file_var(0, len);
file_string(0, buf);

Data is 32-bit float (len) + 32-bit int (buf_len) + buf_bytes. There's an additional 2 bytes, seems like garbage to pad the total payload size to be a multiple of 4.

Lua:

Code:

local data = select(2, reaper.NF_Base64_Decode('AACcQk4AAABwLWJhc3MsIHJvdW5kIHdvdW5kcywgbG93IHBpY2t1cHMsIHZvbCBhbmQgdG9uZSAxMDAgJiBuYXBraW4gYXQgYnJpZGdlIHRvIG11dGVIvw=='))
local len, buf = string.unpack('fs4', data)
print(len, buf)

In Python that would be struct.unpack, but it lacks an equivalent for 's4' (read 4 bytes int string length, then that many bytes as a string). netstruct has it:

Code:

import base64
import netstruct
data = base64.b64decode('AACcQk4AAABwLWJhc3MsIHJvdW5kIHdvdW5kcywgbG93IHBpY2t1cHMsIHZvbCBhbmQgdG9uZSAxMDAgJiBuYXBraW4gYXQgYnJpZGdlIHRvIG11dGVIvw==')
(len, buf) = netstruct.unpack(b'<fi$', data)
print(len, buf)

iMisspell · 04-07-2024, 09:18 PM

Thank you, cfillion, this worked great.