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Re: [PATCH v3 7/8] gzip: move bitbuffer into gunzip state
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 26 Apr 2024 07:55:29 +0200
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- Cc: Jason Andryuk <jason.andryuk@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 26 Apr 2024 05:55:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.04.2024 21:23, Andrew Cooper wrote:
> On 24/04/2024 5:34 pm, Daniel P. Smith wrote:
>> --- a/xen/common/gzip/inflate.c
>> +++ b/xen/common/gzip/inflate.c
>> @@ -1017,8 +1014,8 @@ static int __init inflate(struct gunzip_state *s)
>> /* Undo too much lookahead. The next read will be byte aligned so we
>> * can discard unused bits in the last meaningful byte.
>> */
>> - while (bk >= 8) {
>> - bk -= 8;
>> + while (s->bk >= 8) {
>> + s->bk -= 8;
>> s->inptr--;
>> }
>
> Isn't it just me, but isn't this just:
>
> s->inptr -= (s->bk >> 3);
> s->bk &= 7;
>
> ?
I'd say yes, if only there wasn't the comment talking of just a single byte,
and even there supposedly some of the bits.
Jan
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