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From: Ashijeet Acharya <ashijeetacharya@gmail.com>
Date: Tue, 25 Apr 2017 10:50:51 +0530
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Subject: Re: [Qemu-devel] DMG chunk size independence
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To: John Snow <jsnow@redhat.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>, Fam Zheng <famz@redhat.com>, Kevin Wolf <kwolf@redhat.com>, Max Reitz <mreitz@redhat.com>, QEMU Developers <qemu-devel@nongnu.org>, Peter Wu <peter@lekensteyn.nl>

>> For testing I am first converting the images to raw format and then
>> comparing the resulting image with the one converted using v2.9.0 DMG
>> driver and after battling for 2 days with my code, it finally prints
>> "Images are identical." According to John, that should be pretty
>> conclusive and I completely agree.
>>
>
> Yes, comparing a sample.dmg against a raw file generated from the 2.9.0
> qemu-img tool should be reasonably good evidence that you have not
> altered the behavior of the tool.
>
>> Now, the real thing I wanted to ask was, if someone is aware of a DMG
>> file which has a chunk size above 64 MiB so that I can test those too.
>> If yes, please share the download link with me.
>> Currently I am testing the ones posted by Peter Wu while submitting
>> his DMG work in 2014.
>> Here -> https://lists.nongnu.org/archive/html/qemu-devel/2014-12/msg03606.html
>>
>
> Are any of those over 64MB? I assume you're implying that they aren't.

No, they are not. Because none of them crash while converting with
using the qemu-img tool as in 2.9.0(as it has a limitation of 64MiB).

>
> Maybe Peter knows?...

Yes, I contacted him and he has been of great help so far :-)

Ashijeet