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Allow the use of embedded NULs in keys.

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This commit is contained in:
Bruno Haible
2000-08-20 16:50:54 +00:00
parent cb286153b2
commit c0eb520394
10 changed files with 345 additions and 136 deletions
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33
lib/hash.cc
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@@ -1,36 +1,27 @@
/*
Copyright (C) 1990 Free Software Foundation
Copyright (C) 1990, 2000 Free Software Foundation
written by Doug Lea (dl@rocky.oswego.edu)
This file is part of the GNU C++ Library. 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 library; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <hash.h>
/*
some useful hash functions
Some useful hash function.
It's not a particularly good hash function (<< 5 would be better than << 4),
but people believe in it because it comes from Dragon book.
*/
unsigned int hashpjw (const char* x) // From Dragon book, p436
unsigned int
hashpjw (const char *x, unsigned int len) // From Dragon book, p436
{
unsigned int h = 0;
unsigned int g;
while (*x != 0)
{
h = (h << 4) + (unsigned char) *x++;
if ((g = h & 0xf0000000) != 0)
h = (h ^ (g >> 24)) ^ g;
}
for (; len > 0; len--)
{
h = (h << 4) + (unsigned char) *x++;
if ((g = h & 0xf0000000) != 0)
h = (h ^ (g >> 24)) ^ g;
}
return h;
}