64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
// This may look like C code, but it is really -*- C++ -*-
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// ------------------------------------------------------------------
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// The Goldware Library
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// Copyright (C) 1990-1999 Odinn Sorensen
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// ------------------------------------------------------------------
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this program; if not, write to the Free
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// Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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// MA 02111-1307, USA
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// ------------------------------------------------------------------
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// $Id$
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// ------------------------------------------------------------------
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// CRC-16, CRC-32 and Hashing
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// ------------------------------------------------------------------
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#include <gctype.h>
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#include <gcrcall.h>
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// ------------------------------------------------------------------
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// Hash value generation
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// ------------------------------------------------------------------
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// From the Maximus/Squish MSGAPI by Scott J. Dudley, 1991.
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// The prime is 65521. Whatever that means.. ;-)
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// ------------------------------------------------------------------
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// ------------------------------------------------------------------
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// Generate 32-bit hash value from string
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dword strHash32(const char* s, bool __case) {
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const char* p = s;
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dword g, hash = 0;
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while(*p) {
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hash = (hash << 4) + (__case ? g_tolower(*p) : *p);
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g = hash & 0xF0000000UL;
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if(g) {
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hash |= g >> 24;
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hash |= g;
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}
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p++;
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}
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return hash & 0x7FFFFFFFUL; // Strip off high bit (used as a flag)
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}
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// ------------------------------------------------------------------
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