0020716: Eliminate usage of "config.h" header file
[occt.git] / src / Standard / Standard_ExtString.cxx
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b311480e 1// Copyright (c) 1998-1999 Matra Datavision
973c2be1 2// Copyright (c) 1999-2014 OPEN CASCADE SAS
b311480e 3//
973c2be1 4// This file is part of Open CASCADE Technology software library.
b311480e 5//
d5f74e42 6// This library is free software; you can redistribute it and/or modify it under
7// the terms of the GNU Lesser General Public License version 2.1 as published
973c2be1 8// by the Free Software Foundation, with special exception defined in the file
9// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
10// distribution for complete text of the license and disclaimer of any warranty.
b311480e 11//
973c2be1 12// Alternatively, this file may be used under the terms of Open CASCADE
13// commercial license or contractual agreement.
b311480e 14
7fd59977 15#include <Standard_ExtString.hxx>
16#include <Standard_Type.hxx>
7fd59977 17#include <Standard_OStream.hxx>
7fd59977 18
19Standard_Integer HashCode (const Standard_ExtString Value,
20 const Standard_Integer Upper)
21{
29cb310a 22 // compute SDBM hash of an ext string
23 Standard_Integer hash = 0;
24 for (const Standard_ExtCharacter *c = Value; *c; c++)
25 {
26 /* hash = hash * 33 ^ c */
27 hash = (*c) + (hash << 6) + (hash << 16) - hash;
7fd59977 28 }
7fd59977 29
29cb310a 30 return HashCode (hash, Upper);
7fd59977 31}