mirror of https://github.com/cc65/cc65.git
92 lines
3.8 KiB
C
92 lines
3.8 KiB
C
/*****************************************************************************/
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/* */
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/* hashfunc.c */
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/* */
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/* Hash functions */
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/* */
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/* */
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/* */
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/* (C) 1998-2011, Ullrich von Bassewitz */
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/* Roemerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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/* common */
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#include "hashfunc.h"
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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unsigned HashInt (unsigned V)
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/* Return a hash value for the given integer. The function uses Robert
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** Jenkins' 32 bit integer hash function taken from
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** http://www.concentric.net/~ttwang/tech/inthash.htm
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** For 16 bit integers, the function may be suboptimal.
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*/
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{
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V = (V + 0x7ed55d16) + (V << 12);
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V = (V ^ 0xc761c23c) ^ (V >> 19);
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V = (V + 0x165667b1) + (V << 5);
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V = (V + 0xd3a2646c) ^ (V << 9);
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V = (V + 0xfd7046c5) + (V << 3);
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V = (V ^ 0xb55a4f09) ^ (V >> 16);
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return V;
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}
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unsigned HashStr (const char* S)
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/* Return a hash value for the given string */
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{
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unsigned L, H;
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/* Do the hash */
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H = L = 0;
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while (*S) {
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H = ((H << 3) ^ ((unsigned char) *S++)) + L++;
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}
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return H;
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}
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unsigned HashBuf (const StrBuf* S)
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/* Return a hash value for the given string buffer */
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{
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unsigned I, L, H;
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/* Do the hash */
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H = L = 0;
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for (I = 0; I < SB_GetLen (S); ++I) {
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H = ((H << 3) ^ ((unsigned char) SB_AtUnchecked (S, I))) + L++;
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}
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return H;
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}
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