| 1 | /* $Id: strcache.h 28800 2010-04-27 08:22:32Z 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 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 | #ifndef ___iprt_strcache_h
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| 28 | #define ___iprt_strcache_h
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| 29 |
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| 30 | #include <iprt/types.h>
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| 31 |
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| 32 | RT_C_DECLS_BEGIN
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| 33 |
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| 34 |
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| 35 | /**
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| 36 | * Create a new string cache.
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| 37 | *
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| 38 | * @returns IPRT status code
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| 39 | *
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| 40 | * @param phStrCache Where to return the string cache handle.
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| 41 | * @param pszName The name of the cache (for debug purposes).
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| 42 | */
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| 43 | RTDECL(int) RTStrCacheCreate(PRTSTRCACHE phStrCache, const char *pszName);
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| 44 |
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| 45 |
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| 46 | /**
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| 47 | * Destroys a string cache.
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| 48 | *
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| 49 | * This will cause all strings in the cache to be released and thus become
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| 50 | * invalid.
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| 51 | *
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| 52 | * @returns IPRT status.
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| 53 | *
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| 54 | * @param hStrCache Handle to the string cache. The nil and default
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| 55 | * handles are ignored quietly (VINF_SUCCESS).
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| 56 | */
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| 57 | RTDECL(int) RTStrCacheDestroy(RTSTRCACHE hStrCache);
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| 58 |
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| 59 |
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| 60 | /**
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| 61 | * Enters a string into the cache.
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| 62 | *
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| 63 | * @returns Pointer to a read-only copy of the string.
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| 64 | *
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| 65 | * @param hStrCache Handle to the string cache.
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| 66 | * @param pchString Pointer to a string. This does not need to be
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| 67 | * zero terminated, but must not contain any zero
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| 68 | * characters.
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| 69 | * @param cchString The number of characters (bytes) to enter.
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| 70 | *
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| 71 | * @remarks It is implementation dependent whether the returned string pointer
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| 72 | * differs when entering the same string twice.
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| 73 | */
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| 74 | RTDECL(const char *) RTStrCacheEnterN(RTSTRCACHE hStrCache, const char *pchString, size_t cchString);
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| 75 |
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| 76 | /**
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| 77 | * Enters a string into the cache.
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| 78 | *
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| 79 | * @returns Pointer to a read-only copy of the string.
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| 80 | *
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| 81 | * @param hStrCache Handle to the string cache.
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| 82 | * @param psz Pointer to a zero terminated string.
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| 83 | *
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| 84 | * @remarks See RTStrCacheEnterN.
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| 85 | */
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| 86 | RTDECL(const char *) RTStrCacheEnter(RTSTRCACHE hStrCache, const char *psz);
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| 87 |
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| 88 |
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| 89 | /**
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| 90 | * Retains a reference to a string.
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| 91 | *
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| 92 | * @returns The new reference count. UINT32_MAX is returned if the string
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| 93 | * pointer is invalid.
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| 94 | */
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| 95 | RTDECL(uint32_t) RTStrCacheRetain(const char *psz);
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| 96 |
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| 97 | /**
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| 98 | * Releases a reference to a string.
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| 99 | *
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| 100 | * @returns The new reference count.
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| 101 | * UINT32_MAX is returned if the string pointer is invalid.
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| 102 | *
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| 103 | * @param hStrCache Handle to the string cache. Passing NIL is ok,
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| 104 | * but this may come a performance hit.
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| 105 | * @param psz Pointer to a cached string.
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| 106 | */
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| 107 | RTDECL(uint32_t) RTStrCacheRelease(RTSTRCACHE hStrCache, const char *psz);
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| 108 |
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| 109 | /**
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| 110 | * Gets the string length of a cache entry.
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| 111 | *
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| 112 | * @returns The string length. 0 if the string is invalid (asserted).
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| 113 | *
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| 114 | * @param psz Pointer to a cached string.
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| 115 | */
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| 116 | RTDECL(size_t) RTStrCacheLength(const char *psz);
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| 117 |
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| 118 | RT_C_DECLS_END
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| 119 |
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| 120 | #endif
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| 121 |
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