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deb-goldedplus/goldlib/gall/gcrchash.cpp

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2000-02-25 10:15:17 +00:00
// This may look like C code, but it is really -*- C++ -*-
// ------------------------------------------------------------------
// The Goldware Library
// Copyright (C) 1990-1999 Odinn Sorensen
// ------------------------------------------------------------------
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this program; if not, write to the Free
// Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
// MA 02111-1307, USA
// ------------------------------------------------------------------
// $Id$
// ------------------------------------------------------------------
// CRC-16, CRC-32 and Hashing
// ------------------------------------------------------------------
#include <gctype.h>
#include <gcrcall.h>
// ------------------------------------------------------------------
// Hash value generation
// ------------------------------------------------------------------
// From the Maximus/Squish MSGAPI by Scott J. Dudley, 1991.
// The prime is 65521. Whatever that means.. ;-)
// ------------------------------------------------------------------
// ------------------------------------------------------------------
// Generate 32-bit hash value from string
dword strHash32(const char* s, bool __case) {
const char* p = s;
dword g, hash = 0;
while(*p) {
hash = (hash << 4) + (__case ? tolower(*p) : *p);
g = hash & 0xF0000000UL;
if(g) {
hash |= g >> 24;
hash |= g;
}
p++;
}
return hash & 0x7FFFFFFFUL; // Strip off high bit (used as a flag)
}
// ------------------------------------------------------------------