| 1 | /* $Id: strcache.h 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - String Cache, stub implementation.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2009-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 | #ifndef IPRT_INCLUDED_strcache_h
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| 38 | #define IPRT_INCLUDED_strcache_h
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| 39 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 40 | # pragma once
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| 41 | #endif
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| 42 |
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| 43 | #include <iprt/types.h>
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| 44 |
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| 45 | RT_C_DECLS_BEGIN
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| 46 |
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| 47 |
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| 48 | /**
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| 49 | * Create a new string cache.
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| 50 | *
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| 51 | * @returns IPRT status code
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| 52 | *
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| 53 | * @param phStrCache Where to return the string cache handle.
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| 54 | * @param pszName The name of the cache (for debug purposes).
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| 55 | */
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| 56 | RTDECL(int) RTStrCacheCreate(PRTSTRCACHE phStrCache, const char *pszName);
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| 57 |
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| 58 |
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| 59 | /**
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| 60 | * Destroys a string cache.
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| 61 | *
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| 62 | * This will cause all strings in the cache to be released and thus become
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| 63 | * invalid.
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| 64 | *
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| 65 | * @returns IPRT status.
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| 66 | *
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| 67 | * @param hStrCache Handle to the string cache. The nil and default
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| 68 | * handles are ignored quietly (VINF_SUCCESS).
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| 69 | */
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| 70 | RTDECL(int) RTStrCacheDestroy(RTSTRCACHE hStrCache);
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| 71 |
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| 72 |
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| 73 | /**
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| 74 | * Enters a string into the cache.
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| 75 | *
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| 76 | * @returns Pointer to a read-only copy of the string.
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| 77 | *
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| 78 | * @param hStrCache Handle to the string cache.
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| 79 | * @param pchString Pointer to a string. This does not need to be
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| 80 | * zero terminated, but must not contain any zero
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| 81 | * characters.
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| 82 | * @param cchString The number of characters (bytes) to enter.
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| 83 | *
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| 84 | * @remarks It is implementation dependent whether the returned string pointer
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| 85 | * differs when entering the same string twice.
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| 86 | */
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| 87 | RTDECL(const char *) RTStrCacheEnterN(RTSTRCACHE hStrCache, const char *pchString, size_t cchString);
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| 88 |
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| 89 | /**
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| 90 | * Enters a string into the cache.
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| 91 | *
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| 92 | * @returns Pointer to a read-only copy of the string.
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| 93 | *
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| 94 | * @param hStrCache Handle to the string cache.
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| 95 | * @param psz Pointer to a zero terminated string.
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| 96 | *
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| 97 | * @remarks See RTStrCacheEnterN.
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| 98 | */
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| 99 | RTDECL(const char *) RTStrCacheEnter(RTSTRCACHE hStrCache, const char *psz);
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| 100 |
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| 101 |
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| 102 | /**
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| 103 | * Enters a string into the cache in lower cased form.
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| 104 | *
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| 105 | * @returns Pointer to a read-only lower cased copy of the string.
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| 106 | *
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| 107 | * @param hStrCache Handle to the string cache.
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| 108 | * @param pchString Pointer to a string. This does not need to be
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| 109 | * zero terminated, but must not contain any zero
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| 110 | * characters.
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| 111 | * @param cchString The number of characters (bytes) to enter.
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| 112 | *
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| 113 | * @remarks It is implementation dependent whether the returned string pointer
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| 114 | * differs when entering the same string twice.
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| 115 | */
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| 116 | RTDECL(const char *) RTStrCacheEnterLowerN(RTSTRCACHE hStrCache, const char *pchString, size_t cchString);
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| 117 |
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| 118 | /**
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| 119 | * Enters a string into the cache in lower cased form.
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| 120 | *
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| 121 | * @returns Pointer to a read-only lower cased copy of the string.
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| 122 | *
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| 123 | * @param hStrCache Handle to the string cache.
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| 124 | * @param psz Pointer to a zero terminated string.
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| 125 | *
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| 126 | * @remarks See RTStrCacheEnterN.
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| 127 | */
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| 128 | RTDECL(const char *) RTStrCacheEnterLower(RTSTRCACHE hStrCache, const char *psz);
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| 129 |
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| 130 |
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| 131 | /**
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| 132 | * Retains a reference to a string.
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| 133 | *
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| 134 | * @returns The new reference count. UINT32_MAX is returned if the string
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| 135 | * pointer is invalid.
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| 136 | */
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| 137 | RTDECL(uint32_t) RTStrCacheRetain(const char *psz);
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| 138 |
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| 139 | /**
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| 140 | * Releases a reference to a string.
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| 141 | *
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| 142 | * @returns The new reference count.
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| 143 | * UINT32_MAX is returned if the string pointer is invalid.
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| 144 | *
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| 145 | * @param hStrCache Handle to the string cache. NIL is NOT allowed.
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| 146 | * @param psz Pointer to a cached string.
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| 147 | */
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| 148 | RTDECL(uint32_t) RTStrCacheRelease(RTSTRCACHE hStrCache, const char *psz);
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| 149 |
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| 150 | /**
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| 151 | * Gets the string length of a cache entry.
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| 152 | *
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| 153 | * @returns The string length. 0 if the string is invalid (asserted).
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| 154 | *
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| 155 | * @param psz Pointer to a cached string.
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| 156 | */
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| 157 | RTDECL(size_t) RTStrCacheLength(const char *psz);
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| 158 |
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| 159 |
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| 160 | /**
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| 161 | * Gets cache statistics.
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| 162 | *
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| 163 | * All parameters, except @a hStrCache, are optional and can be NULL.
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| 164 | *
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| 165 | * @returns Number of strings, UINT32_MAX on failure (or not supported).
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| 166 | * @param hStrCache Handle to the string cache.
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| 167 | * @param pcbStrings The number of string bytes (including
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| 168 | * terminators) .
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| 169 | * @param pcbChunks Amount of memory we've allocated for the
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| 170 | * internal allocator.
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| 171 | * @param pcbBigEntries Amount of memory we've allocated off the heap
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| 172 | * for really long strings that doesn't fit in the
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| 173 | * internal allocator.
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| 174 | * @param pcHashCollisions Number of hash table insert collisions.
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| 175 | * @param pcHashCollisions2 Number of hash table secondary insert
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| 176 | * collisions.
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| 177 | * @param pcHashInserts Number of hash table inserts.
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| 178 | * @param pcRehashes The number of rehashes.
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| 179 | *
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| 180 | * @remarks This is not a stable interface as it needs to reflect the cache
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| 181 | * implementation.
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| 182 | */
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| 183 | RTDECL(uint32_t) RTStrCacheGetStats(RTSTRCACHE hStrCache, size_t *pcbStrings, size_t *pcbChunks, size_t *pcbBigEntries,
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| 184 | uint32_t *pcHashCollisions, uint32_t *pcHashCollisions2, uint32_t *pcHashInserts,
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| 185 | uint32_t *pcRehashes);
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| 186 |
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| 187 | /**
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| 188 | * Indicates whether this a real string cache or a cheap place holder.
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| 189 | *
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| 190 | * A real string cache will return the same address when a string is added
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| 191 | * multiple times.
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| 192 | *
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| 193 | * @returns true / false.
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| 194 | */
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| 195 | RTDECL(bool) RTStrCacheIsRealImpl(void);
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| 196 |
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| 197 |
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| 198 | RT_C_DECLS_END
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| 199 |
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| 200 | #endif /* !IPRT_INCLUDED_strcache_h */
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| 201 |
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