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Re: How to find the character breaking the file encoding?


From: Óscar Fuentes
Subject: Re: How to find the character breaking the file encoding?
Date: Wed, 05 Feb 2020 03:42:29 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.60 (gnu/linux)

Marcin Borkowski <address@hidden> writes:

> I have a large UTF-8 file (about 1.5MB) to which I add stuff regularly.
> Recently, Emacs started saving it as a binary file.  I suspect I somehow
> inserted a non-UTF-8 sequence of bytes there.  Is there any way Emacs
> can help me finding it (other than me manually bisecting the file until
> I find the offending place)?

Try using M-x encode-coding-region ENTERT utf-8 ENTER

With some luck this will mark the buffer as modified because it replaces
unencodable content with blanks (IIRC). Then you can use M-x
diff-buffer-with-file to see the line that contains the problematic
sequence.




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