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From: "René Scharfe" <l.s.r@web.de>
To: Jeff King <peff@peff.net>, Derrick Stolee <stolee@gmail.com>
Cc: git@vger.kernel.org, Yiyuan guo <yguoaz@gmail.com>
Subject: Re: [PATCH 3/5] pack-objects: clamp negative window size to 0
Date: Tue, 4 May 2021 20:47:56 +0200	[thread overview]
Message-ID: <02a66bfb-aac0-c05e-dab3-366bc312d900@web.de> (raw)
In-Reply-To: <YJAOzTIXkO2lhxSs@coredump.intra.peff.net>

Am 03.05.21 um 16:55 schrieb Jeff King:
> On Mon, May 03, 2021 at 08:10:24AM -0400, Derrick Stolee wrote:
>
>> On 5/1/2021 10:03 AM, Jeff King wrote:
>>> A negative window size makes no sense, and the code in find_deltas() is
>>> not prepared to handle it. If you pass "-1", for example, we end up
>>> generate a 0-length array of "struct unpacked", but our loop assumes it
>>> has at least one entry in it (and we end up reading garbage memory).
>>>
>>> We could complain to the user about this, but it's more forgiving to
>>> just clamp it to 0, which means "do not find any deltas at all". The
>>> 0-case is already tested earlier in the script, so we'll make sure this
>>> does the same thing.
>>
>> This seems like a reasonable approach. It takes existing "undefined"
>> behavior and turns it into well-understood, "defined" behavior.
>
> I was on the fence on doing that, or just:
>
>   if (window < 0)
> 	die("sorry dude, negative windows are nonsense");
>
> So if anybody has a strong preference, I could be easily persuaded. Part
> of what led me to being forgiving was that we similarly clamp too-large
> depth values (with a warning; I didn't think it was really necessary
> here, though).

There's another option: Mapping -1 or all negative values to the
maximum:

	if (window < 0)
		window = INT_MAX;
	if (depth < 0)
		depth = (1 << OE_DEPTH_BITS) - 1;

That's allows saying "gimme all you got" without knowing or being
willing to type out the exact maximum value, which may change between
versions.  Not all that useful for --window, I guess.  That convention
has been used elsewhere I'm sure, but can't point out a concrete
example.  $arr[-1] get the last item of the array $arr in PowerShell,
though, which is kind of similar.

Sure, you get the same effect in both cases by typing 2147483647, but
-1 is more convenient.

Not a strong preference, but I thought it was at least worth
mentioning that particular bike shed color. :)

René

  reply	other threads:[~2021-05-04 18:48 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-01 14:02 [PATCH 0/5] pack-objects: better handling of negative options Jeff King
2021-05-01 14:02 ` [PATCH 1/5] t5300: modernize basic tests Jeff King
2021-05-03  5:27   ` Junio C Hamano
2021-05-03 14:53     ` Jeff King
2021-05-01 14:03 ` [PATCH 2/5] t5300: check that we produced expected number of deltas Jeff King
2021-05-01 14:03 ` [PATCH 3/5] pack-objects: clamp negative window size to 0 Jeff King
2021-05-03 12:10   ` Derrick Stolee
2021-05-03 14:55     ` Jeff King
2021-05-04 18:47       ` René Scharfe [this message]
2021-05-04 21:38         ` Jeff King
2021-05-05 11:53         ` Ævar Arnfjörð Bjarmason
2021-05-05 16:19           ` René Scharfe
2021-05-01 14:04 ` [PATCH 4/5] t5316: check behavior of pack-objects --depth=0 Jeff King
2021-05-01 14:04 ` [PATCH 5/5] pack-objects: clamp negative depth to 0 Jeff King
2021-05-03 12:11   ` Derrick Stolee

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