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Re: How is the APFS block checksum calculated?

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Re: How is the APFS block checksum calculated?

Subject: Re: How is the APFS block checksum calculated?
From: Thomas Tempelmann <email@hidden>
Date: Sun, 30 Apr 2017 01:42:33 +0200

On Sun, Apr 30, 2017 at 1:37 AM, Toby Thain <email@hidden> wrote:

Seems you have % instead of & ? And watch out for sign extension on those literal 0xFFFFFFFF's. You probably want an unsigned and long long suffix on them.

Nope, both are correct, at least for standard fletcher algorithm. It's always modulo (%) MAXINT-1. And 0xFFFFFFFF's gets properly expanded to unsigned 64 bit, as it should. I double checked using uint64_t variable all the way, and it didn't change the outcome.

--

Thomas Tempelmann, http://www.tempel.org/
Follow me on Twitter: https://twitter.com/tempelorg
Read my programming blog: http://blog.tempel.org/

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	>How is the APFS block checksum calculated? (From: Thomas Tempelmann <email@hidden>)
	>Re: How is the APFS block checksum calculated? (From: Toby Thain <email@hidden>)

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