| 1 | /**************************************************************************
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| 2 | *
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| 3 | * hash.h -- Hash function
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| 4 | * Copyright (C) 1994 Neil Sharman
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| 5 | *
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| 6 | * This program is free software; you can redistribute it and/or modify
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| 7 | * it under the terms of the GNU General Public License as published by
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| 8 | * the Free Software Foundation; either version 2 of the License, or
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| 9 | * (at your option) any later version.
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| 10 | *
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| 11 | * This program is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | * GNU General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU General Public License
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| 17 | * along with this program; if not, write to the Free Software
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| 18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 19 | *
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| 20 | **************************************************************************/
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| 21 |
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| 22 | #ifndef H_HASH
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| 23 | #define H_HASH
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| 24 |
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| 25 | #define HASH(h, step, wd, tablesize) \
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| 26 | do { \
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| 27 | register u_char *p=wd; \
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| 28 | register mg_s_long len = *p++; \
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| 29 | register mg_u_long hval; \
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| 30 | if (len>25) len = 25; \
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| 31 | for (hval=0; len; --len) \
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| 32 | hval = (hval << 5) - hval + *p++; \
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| 33 | step = hval % (tablesize - 2) + 1; \
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| 34 | h = hval % tablesize; \
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| 35 | } while (0)
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| 36 |
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| 37 |
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| 38 |
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| 39 | #endif
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