| 1 | /* $Id: strhash1.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - String Hashing by Algorithm \#1.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2012-2017 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include "internal/iprt.h"
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| 32 | #include <iprt/string.h>
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| 33 |
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| 34 | #include "internal/strhash.h"
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| 35 |
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| 36 |
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| 37 | RTDECL(uint32_t) RTStrHash1(const char *pszString)
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| 38 | {
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| 39 | size_t cchIgnored;
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| 40 | return sdbm(pszString, &cchIgnored);
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| 41 | }
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| 42 |
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| 43 |
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| 44 | RTDECL(uint32_t) RTStrHash1N(const char *pszString, size_t cchString)
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| 45 | {
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| 46 | size_t cchIgnored;
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| 47 | return sdbmN(pszString, cchString, &cchIgnored);
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| 48 | }
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| 49 |
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| 50 |
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| 51 | RTDECL(uint32_t) RTStrHash1ExN(size_t cPairs, ...)
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| 52 | {
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| 53 | va_list va;
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| 54 | va_start(va, cPairs);
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| 55 | uint32_t uHash = RTStrHash1ExNV(cPairs, va);
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| 56 | va_end(va);
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| 57 | return uHash;
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| 58 | }
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| 59 |
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| 60 |
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| 61 | RTDECL(uint32_t) RTStrHash1ExNV(size_t cPairs, va_list va)
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| 62 | {
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| 63 | uint32_t uHash = 0;
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| 64 | for (uint32_t i = 0; i < cPairs; i++)
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| 65 | {
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| 66 | const char *psz = va_arg(va, const char *);
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| 67 | size_t cch = va_arg(va, size_t);
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| 68 | uHash += sdbmIncN(psz, cch, uHash);
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| 69 | }
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| 70 | return uHash;
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| 71 | }
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| 72 |
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