From: Konstantin Osipov <kostja@tarantool.org>
To: Serge Petrenko <sergepetrenko@tarantool.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>,
tarantool-patches@freelists.org
Subject: Re: [tarantool-patches] [PATCH v2 2/8] decimal: fix encoding numbers with positive exponent.
Date: Thu, 15 Aug 2019 01:21:10 +0300 [thread overview]
Message-ID: <20190814222110.GE28533@atlas> (raw)
In-Reply-To: <72BD3FFE-9D36-41DA-B11D-2E30E9A5D294@tarantool.org>
* Serge Petrenko <sergepetrenko@tarantool.org> [19/08/13 12:03]:
> Similar code is already used in
> mp_encode_extl/mp_decode_extl()
> (yes, it was also introduced by me, but it passed the review):
>
> (the type of ’type’ is int8_t)
> data = mp_store_u8(data, type);
> …
> *type = mp_load_u8(data);
The problem with this approach is that you lost sign in your
storage representation. Imagine this data format is read by a code
which is different from the one you wrote, and relies on msgpack
format specifiers alone. It will honestly believe that the value
is always positive.
Basically, you should follow MsgPack guidelines for choosing
format specifiers.
--
Konstantin Osipov, Moscow, Russia
next prev parent reply other threads:[~2019-08-14 22:21 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-08 11:55 [PATCH v2 0/8] Decimal indices Serge Petrenko
2019-08-08 11:55 ` [PATCH v2 1/8] lua: fix decimal comparison with nil Serge Petrenko
2019-08-12 21:16 ` Konstantin Osipov
2019-08-14 11:00 ` Vladimir Davydov
2019-08-14 22:17 ` Konstantin Osipov
2019-08-08 11:55 ` [PATCH v2 2/8] decimal: fix encoding numbers with positive exponent Serge Petrenko
2019-08-12 21:18 ` Konstantin Osipov
2019-08-13 9:00 ` [tarantool-patches] " Serge Petrenko
2019-08-14 22:21 ` Konstantin Osipov [this message]
2019-08-14 11:56 ` Vladimir Davydov
2019-08-08 11:55 ` [PATCH v2 3/8] lua/pickle: fix a typo Serge Petrenko
2019-08-12 21:18 ` Konstantin Osipov
2019-08-14 11:12 ` Vladimir Davydov
2019-08-14 11:15 ` Serge Petrenko
2019-08-08 11:55 ` [PATCH v2 4/8] lua: rework luaL_field types to support msgpack extensions Serge Petrenko
2019-08-12 21:23 ` Konstantin Osipov
2019-08-13 13:15 ` [tarantool-patches] " Serge Petrenko
2019-08-14 22:23 ` Konstantin Osipov
2019-08-15 8:27 ` Serge Petrenko
2019-08-16 8:06 ` Konstantin Osipov
2019-08-08 11:55 ` [PATCH v2 5/8] box: rework field_def and tuple_compare to work with mp_field_type instead of mp_type Serge Petrenko
2019-08-12 21:28 ` Konstantin Osipov
2019-08-08 11:55 ` [PATCH v2 6/8] decimal: allow to encode/decode decimals as MsgPack Serge Petrenko
2019-08-12 21:29 ` Konstantin Osipov
2019-08-12 21:34 ` Konstantin Osipov
2019-08-13 14:01 ` Serge Petrenko
2019-08-14 22:25 ` Konstantin Osipov
2019-08-08 11:55 ` [PATCH v2 7/8] decimal: add conversions to (u)int64_t Serge Petrenko
2019-08-12 21:39 ` Konstantin Osipov
2019-08-13 14:18 ` Serge Petrenko
2019-08-14 22:26 ` Konstantin Osipov
2019-08-14 22:29 ` Konstantin Osipov
2019-08-08 11:55 ` [PATCH v2 8/8] decimal: allow to index decimals Serge Petrenko
2019-08-08 13:42 ` Serge Petrenko
2019-08-12 21:41 ` Konstantin Osipov
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