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a80b728177
1. Functions Precision::IsIllegal(...) and Precision::IsInfinitesimal(...) were added. 2. Detection incorrect numbers read from *.stp and/or *.igs files was added.
63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
// Created on: 1993-03-08
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// Created by: Remi LEQUETTE
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// Copyright (c) 1993-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#include <Precision.hxx>
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//Binary representation of double numbers: expands it to MANTISSA, EXPONENT and SIGN-bit.
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struct stDBLType
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{
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unsigned int manl:32;
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unsigned int manh:20;
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unsigned int exp:11;
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unsigned int sign:1;
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};
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//=======================================================================
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//function : IsIllegal
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//purpose : Returns True if R is infinite, NAN or another number
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// which is not supported by OCCT.
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// Fragment of fpclassify(...) function is used, which is taken
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// from here: http://www.jbox.dk/sanos/source/lib/math.c.html
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//=======================================================================
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Standard_Boolean Precision::IsIllegal (const Standard_Real R)
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{
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stDBLType* aDoubleBits = (struct stDBLType*) &R;
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if (aDoubleBits->exp == 0)
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{
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if (aDoubleBits->manh != 0 || aDoubleBits->manl != 0)
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{//_FPCLASS_ND (-DBL_MIN/2.0) or _FPCLASS_PD (+DBL_MIN/2.0)
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return Standard_True;
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}
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}
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if (aDoubleBits->exp == 0x7ff)
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{//_FPCLASS_NINF (-1/0), _FPCLASS_PINF (+1/0), _FPCLASS_QNAN or _FPCLASS_SNAN
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return Standard_True;
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}
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const Standard_Real anINf = 2.0*Infinite();
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if(R >= anINf)
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return Standard_True;
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if(R <= -anINf)
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return Standard_True;
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return Standard_False;
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}
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