From: Anthony Liguori <anthony@codemonkey.ws>
To: Markus Armbruster <armbru@redhat.com>
Cc: Luiz Capitulino <lcapitulino@redhat.com>,
"Richard W.M. Jones" <rjones@redhat.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] qemu: json: Fix parsing of integers >= 0x8000000000000000
Date: Mon, 23 May 2011 10:07:21 -0500 [thread overview]
Message-ID: <4DDA7829.5090103@codemonkey.ws> (raw)
In-Reply-To: <m3fwo532xo.fsf@blackfin.pond.sub.org>
On 05/23/2011 09:29 AM, Markus Armbruster wrote:
> Anthony Liguori<anthony@codemonkey.ws> writes:
>
> JavaScript's implementation of JSON sets limits on the range of numbers,
> namely they need to fit into IEEE doubles.
>
> Our implementation sets different limits. IIRC, it's something like
> "numbers with a fractional part or an exponent need to fit into IEEE
> doubles, anything else into int64_t." Not exactly the acme of elegance,
> either. But it works for us.
In order to be compatible with JavaScript (which I think is necessary to
really satisfy the spec), we just need to make sure that our integers
are represented by at least 53-bits (to enable signed integers) and
critically, fall back to floating point representation to ensure that we
round instead of truncate.
Regards,
Anthony Liguori
>
next prev parent reply other threads:[~2011-05-23 15:07 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
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 [this message]
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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