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REAL48 data format 2 double (ANSI-C)

hello,
 
i have many DIADEM binary datas in the 6Byte long REAL48 (*.R48) data format. now i wont to read the binary data in with a ANSI-C software programm.
my problem is i've to transalte the Diadem REAL48 dataformat into the 8-Byte long ANSI-C datatype "doube". And I didn't now the strcture of the REAL48 datatype!?
 
can everyone help me?
 
(you can answer in german)
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Here some samples of ther REAL48 binary data:
 
Dezimal = binary HEX
 -1   = 81 00 00 00 00 80
1    = 81 00 00 00 00 00
-2   = 82 00 00 00 00 80
2    = 82 00 00 00 00 00
-3   = 82 00 00 00 00 C0
3    = 82 00 00 00 00 40
-4   = 83 00 00 00 00 80
4    = 83 00 00 00 00 00
5    = 83 00 00 00 00 20
256  = 89 00 00 00 00 00
257  = 89 00 00 00 00 80
1024 = 8B 00 00 00 00 00
1280 = 8B 00 00 00 00 20
1280 = 8B 00 00 00 20 20
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Hello FTE,
you may want to look at http://www.borland.com/techpubs/delphi/delphi5/oplg/memory.html . Please ask if you have questions.
Andreas
 
 
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