parse_from_bytes() not working on BytesIO() object

[degenkolb]

Describe the bug
Hi, I would like to use mailparser on a BytesIO() object in python 3 but fail to load the message.
I have to use the object of class 'bytes' because I get the data handed this way.

I also tried with the other parse_from_ functions. All fail.

https://docs.python.org/3/glossary.html#term-bytes-like-object explizit mentions Objects of type bytes as a "bytes-like object".

Is there another way I'm not aware of?

To Reproduce
Steps to reproduce the behavior:
Minimal working example

from io import BytesIO
from os import read
import mailparser

fp = BytesIO()

with open('mail_file.eml', 'rb') as f:
    filecontent = f.read()
    print("type(filecontent)= ", type(filecontent))
    fp.write(filecontent)

mail = mailparser.parse_from_bytes(fp)

print(mail.body)

this results in

$ python testparser.py 
type(filecontent)=  <class 'bytes'>
Traceback (most recent call last):
  File "testparser.py", line 15, in <module>
    mail = mailparser.parse_from_bytes(fp)
  File "/home/xxx/.local/lib/python3.8/site-packages/mailparser/mailparser.py", line 118, in parse_from_bytes
    return MailParser.from_bytes(bt)
  File "/home/xxx/.local/lib/python3.8/site-packages/mailparser/mailparser.py", line 240, in from_bytes
    message = email.message_from_bytes(bt)
  File "/usr/lib/python3.8/email/__init__.py", line 46, in message_from_bytes
    return BytesParser(*args, **kws).parsebytes(s)
  File "/usr/lib/python3.8/email/parser.py", line 122, in parsebytes
    text = text.decode('ASCII', errors='surrogateescape')
AttributeError: '_io.BytesIO' object has no attribute 'decode'

Expected behavior
mailparser.parse_from_bytes(fp) to load the object and be able to parse the message

Raw mail
Do you need the raw message? This is a pre parser problem so the message should be irrelevant.

Environment:

• OS: Linux Ubuntu 20.04
• Docker: no
• mail-parser version: 3.15.0
• python: 3.8.10

Thansk for your response.

[degenkolb]

Closing this since I found a solution.

mail = mailparser.parse_from_bytes(fp.getvalue())