ps2pdf and the right output size

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I'm using a tool which generates a postscript file where the bounding 
box doesn't necessarily correlate to a specific page type (8.5x11, 
etc.).   In fact, the PS page size is much larger than most page sizes, 
it might be as large as 50in x 50in etc.

ps2pdf will create a pdf output that:

* uses the default page size
* uses the page size if a page type if specified on the command line
* uses X and Y dimensions if provided in the command line.

I've hacked up a script which gen's the PS, pulls out the 
pageboundingbox X and Y sizes out of the PS, and then passes these 
values to ps2pdf via the command line.  

This works ok but I'm wondering if there's a way to tell ps2pdf to just 
set the pdf page size to the pageboundingbox X and Y sizes defined in PS 
thus eliminating the need for me to determine these and feed them to 
ps2pdf via the command line.


Thanks