[PD] Array Size limits

Mathieu Bouchard matju at artengine.ca
Mon Oct 24 16:24:32 CEST 2011

Le 2011-10-24 à 12:57:00, João Pais a écrit :

> what I also do is to send the file name to iemlib/soundfile_info, which gives 
> out the file size (for wav files). then I send that value as an argument to 
> -maxsize, and I don't have to worry about how big the sound file is. (except 
> for Mathieu's error, which I hadn't heard about before)

AFAIK (by reading source, not by trying) :

-maxsize between 2GB and 4GB will cause pd to take the size as a negative 
value, which it will replace by 0, and thus won't load the file.

-maxsize between 4GB and 6GB will pretend that the size is 4GB less than 
what you specified.

-maxsize between 6GB and 8GB will give a negative value again.

-maxsize between 4GB and 6GB will pretend that the size is 8GB less than 
what you specified.

and so on.

This problem also would happen in 64-bit mode.

Someone with a bigger RAM and bigger soundfile could confirm it.

Just like most other bugs about overflow, the changes happen at binary GB 
boundaries : multiples of 1024*1024*1024 bytes, and not multiples of 

| Mathieu BOUCHARD ----- téléphone : +1.514.383.3801 ----- Montréal, QC

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