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From:   Junio C Hamano <gitster@pobox.com>
To:     Jason Xu <jasonx98@gmail.com>
Cc:     git@vger.kernel.org
Subject: Re: Force git diff to create a binary patch?
References: <CAGPh-qNrjQ5xwbPcfJdBqrqOJQsVpa2hy-XHwN-8rhPPZe4Vpg@mail.gmail.com>
Date:   Mon, 13 Jul 2020 07:51:12 -0700
In-Reply-To: <CAGPh-qNrjQ5xwbPcfJdBqrqOJQsVpa2hy-XHwN-8rhPPZe4Vpg@mail.gmail.com>
        (Jason Xu's message of "Mon, 13 Jul 2020 00:58:23 -0400")
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Jason Xu <jasonx98@gmail.com> writes:

> Here are two small files with non-ASCII data, yet git diff considers
> them text instead of binary.

Because it is based on heuristics, without a NUL in that short file,
the file may not be judged to be binary.

    echo '* -diff' >.git/info/attributes

would tell Git that they need to be treated as binary junk not
suited for textual diff (you'd need to tweak the pattern to your
need).