From: "Daniel P. Berrange" <berrange@redhat.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: qemu-devel@nongnu.org, "Richard W.M. Jones" <rjones@redhat.com>,
Luiz Capitulino <lcapitulino@redhat.com>
Subject: Re: [Qemu-devel] [PATCH] qemu: json: Fix parsing of integers >= 0x8000000000000000
Date: Mon, 23 May 2011 14:40:21 +0100 [thread overview]
Message-ID: <20110523134021.GT24143@redhat.com> (raw)
In-Reply-To: <4DDA620F.1090308@codemonkey.ws>
On Mon, May 23, 2011 at 08:33:03AM -0500, Anthony Liguori wrote:
> On 05/23/2011 08:04 AM, Daniel P. Berrange wrote:
> >On Fri, May 20, 2011 at 01:11:05PM -0500, Anthony Liguori wrote:
> >>On 05/20/2011 01:03 PM, Richard W.M. Jones wrote:
> >>>
> >>>There seem to be a few unsafe uses of strto* functions. This patch
> >>>just fixes the one that affects me :-)
> >>
> >>Sending an integer of this size is not valid JSON.
> >>
> >>Your patch won't accept negative numbers, correct?
> >>
> >>JSON only supports int64_t.
> >
> >That's not really true. JSON supports arbitrarily large numbers
> >& integers.
>
> Try the following snippet in your browser:
>
> <html>
> <head>
> <script type="text/javascript">
> alert(9223372036854775807);
> </script>
> </head>
> </html>
>
> The actual value of the alert will surprise you :-)
>
> Integers in Javascript are actually represented as doubles
> internally which means that integer constants are only accurate up
> to 52 bits.
>
> So really, we should cap integers at 32-bit :-/
>
> Have I mentioned recently that I really dislike JSON...
NB, I am distinguishing between JSON the generic specification and
JSON as implemented in web browsers. JSON the specification has *no*
limitation on integers. Any limitation, like the one you demonstrate,
is inherantly just specific to the implementation. We have no need to
limit ourselves to what web browsers currently support for integers in
JSON. Indeed, limiting ourselves to what browsers support will make the
JSON monitor mode essentially useless, requiring yet another new mode
with a format which can actually represent the data we need to use.
What I suggested is in compliance with the JSON specification and allows
us to support uint64 which we need for commands which take disk or memory
offsets.
Regards,
Daniel
--
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next prev parent reply other threads:[~2011-05-23 13:40 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-20 18:03 [Qemu-devel] [PATCH] qemu: json: Fix parsing of integers >= 0x8000000000000000 Richard W.M. Jones
2011-05-20 18:11 ` Anthony Liguori
2011-05-20 18:36 ` Richard W.M. Jones
2011-05-20 18:37 ` Richard W.M. Jones
2011-05-20 18:47 ` Richard W.M. Jones
2011-05-20 21:19 ` Richard W.M. Jones
2011-05-23 13:04 ` Daniel P. Berrange
2011-05-23 13:33 ` Anthony Liguori
2011-05-23 13:39 ` Richard W.M. Jones
2011-05-23 13:40 ` Daniel P. Berrange [this message]
2011-05-23 13:45 ` Anthony Liguori
2011-05-23 14:14 ` Daniel P. Berrange
2011-05-23 15:03 ` Anthony Liguori
2011-05-23 15:41 ` Daniel P. Berrange
2011-05-23 14:20 ` Markus Armbruster
2011-05-23 13:50 ` Anthony Liguori
2011-05-23 14:02 ` Luiz Capitulino
2011-05-23 14:06 ` Anthony Liguori
2011-05-23 14:24 ` Daniel P. Berrange
2011-05-23 14:29 ` Markus Armbruster
2011-05-23 14:32 ` Daniel P. Berrange
2011-05-23 15:07 ` Anthony Liguori
2011-05-23 15:19 ` Richard W.M. Jones
2011-05-23 15:24 ` Anthony Liguori
2011-05-23 15:29 ` Richard W.M. Jones
2011-05-23 15:59 ` Anthony Liguori
2011-05-23 16:06 ` Daniel P. Berrange
2011-05-23 15:38 ` Daniel P. Berrange
2011-05-23 16:18 ` Markus Armbruster
2011-05-23 16:37 ` Anthony Liguori
2011-05-24 6:26 ` Markus Armbruster
2011-05-23 23:02 ` [Qemu-devel] Use a hex string (was: [PATCH] qemu: json: Fix parsing of integers >= 0x8000000000000000) Jamie Lokier
2011-05-24 2:50 ` [Qemu-devel] Use a hex string Anthony Liguori
2011-05-24 5:30 ` Jamie Lokier
2011-05-23 13:38 ` [Qemu-devel] [PATCH] qemu: json: Fix parsing of integers >= 0x8000000000000000 Anthony Liguori
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