Unsigned integers and Int64 in node.js

[Tony Huang]

Hi all,

I've implemented a binary based protocol in node.js, and I need a Int64 to present the id of the messages.

What library should I use to represent unsigned integers as well as UInt64s?

I've taken a look at the node-int64 module, but it doesn't support any calculation which is necessary in my case to decode a compressed int64.

Thank you.

Best regards.

--
------------------------------------------------------
Tony Huang    cnw...@gmail.com
                     wz...@hotmail.com
                     wz...@vip.sina.com

[Paddy Byers]

Hi,

I've implemented a binary based protocol in node.js, and I need a Int64 to present the id of the messages.

What library should I use to represent unsigned integers as well as UInt64s?

I've taken a look at the node-int64 module, but it doesn't support any calculation which is necessary in my case to decode a compressed int64.

Have you looked at Protocol Buffers? Javascript isn't one of their officially supported languages but there is an independent implementation for javascript which includes an implementation of their I64 type:

https://github.com/sirikata/protojs/blob/master/protobuf.js#L114

They have a variable-length wire encoding (base 128) for these as well.

I'm doing someone a bit similar for thrift's int64 type so I'm happy to contribute to a joint effort.

What kinds of calculation do you want to do?

Paddy

[Chad Retz]

I had the same problem with a binary protocol. I just gave the data back as a big numeric string and suggested he use node-bigint[1] or bigdecimal.js[2] to do more with it. Both of those support arithmetic operations.

[1] - https://github.com/substack/node-bigint
[2] - https://github.com/iriscouch/bigdecimal.js

[christkv]

The Long class from

https://github.com/mongodb/js-bson/blob/master/lib/bson/long.js

might be helpful as well it's from the google closure lib

On Apr 18, 9:26 pm, Chad Retz <chad.r...@gmail.com> wrote:
> I had the same problem with a binary protocol. I just gave the data back as
> a big numeric string and suggested he use node-bigint[1] or
> bigdecimal.js[2] to do more with it. Both of those support arithmetic
> operations.
>
> [1] -https://github.com/substack/node-bigint

> [2] -https://github.com/iriscouch/bigdecimal.js

>
>
>
>
>
>
>
> On Wednesday, April 18, 2012 11:31:23 AM UTC-5, Tony Huang wrote:
>
> > Hi all,
>
> > I've implemented a binary based protocol in node.js, and I need a Int64 to
> > present the id of the messages.
>
> > What library should I use to represent unsigned integers as well as
> > UInt64s?
>
> > I've taken a look at the node-int64 module, but it doesn't support any
> > calculation which is necessary in my case to decode a compressed int64.
>
> > Thank you.
>
> > Best regards.
>
> > --
> > ------------------------------------------------------

> > Tony Huang    cnwz...@gmail.com
> >                      wz...@hotmail.com
> >                      wz...@vip.sina.com

[Tony Huang]

The Long class just fit my requirement, thank you christ, thank you all.

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