Re: [nodejs] why not add read or write 64bit from Node.JS Buffer class?

[Ben Noordhuis]

On Wed, Jan 16, 2013 at 11:25 AM, Cheng Shao <dgkan...@gmail.com> wrote:
> I'm trying out nodejs as a TCP server. i want to read unsigned 64bit integer
> from Buffer. find not similar function. why not to be added?

JS numbers are 64 bits doubles. That means you can't represent 64 bit
integers with them because they're only exact for integers up to 2^53.

To illustrate:

$ node
> Math.pow(2, 53) === Math.pow(2, 53) - 1
false
> Math.pow(2, 53) === Math.pow(2, 53)
true
> Math.pow(2, 53) === Math.pow(2, 53) + 1
true

[Nathan Rajlich]

If you don't mind a compiled solution, my "ref" module adds the (read|write)Int64[BL]E functions to the Buffer object: https://github.com/TooTallNate/ref. You can pass in String representations of the int64 values and they will be dealt with in C-land.

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