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Message from discussion Extract double in binary file
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Terry Reedy  
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 More options Nov 27 2003, 1:00 pm
Newsgroups: comp.lang.python
From: "Terry Reedy" <tjre...@udel.edu>
Date: Thu, 27 Nov 2003 13:00:03 -0500
Local: Thurs, Nov 27 2003 1:00 pm
Subject: Re: Extract double in binary file
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"Pascal" <pascal.par...@free.fr> wrote in message

news:e567c03a.0311270107.9fc983d@posting.google.com...

> Some precisions:

('examples': 'precisions' does not work here in English)

> 0.00 > 00-00-00-00-00-00-7F-00
> 1.00 > 00-00-00-00-00-00-00-81
> 2.00 > 00-00-00-00-00-00-00-82
> 3.00 > 00-00-00-00-00-00-40-82
> 4.00 > 00-00-00-00-00-00-00-83

> 10.00 > 00-00-00-00-00-00-20-84
> 1000.00 > 00-00-00-00-00-00-7A-8A

> 1.11 > 14-AE-47-E1-7A-14-0E-81

The only obvious pattern I see is that 2**0 -> 81, 2**1->82, ...
2**9->8A (where A==10)  ie, for non-zero, last byte is 81 + exponent
of largest power of two, which seems like type of float, and first 6
are 0 if integral.  May be proprietary format.

TJR


 
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