84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//=============================================================================//
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#ifndef STRINGPOOL_H
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#define STRINGPOOL_H
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#if defined(_WIN32)
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#pragma once
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#endif
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#include "utlrbtree.h"
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#include "utlvector.h"
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//-----------------------------------------------------------------------------
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// Purpose: Allocates memory for strings, checking for duplicates first,
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// reusing exising strings if duplicate found.
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//-----------------------------------------------------------------------------
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class CStringPool {
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public:
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CStringPool();
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~CStringPool();
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unsigned int Count() const;
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const char* Allocate(const char* pszValue);
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void FreeAll();
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// searches for a string already in the pool
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const char* Find(const char* pszValue);
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protected:
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typedef CUtlRBTree<const char*, unsigned short> CStrSet;
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CStrSet m_Strings;
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};
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//-----------------------------------------------------------------------------
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// Purpose: A reference counted string pool.
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//
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// Elements are stored more efficiently than in the conventional string pool,
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// quicker to look up, and storage is tracked via reference counts.
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//
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// At some point this should replace CStringPool
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//-----------------------------------------------------------------------------
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class CCountedStringPool {
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public: // HACK, hash_item_t structure should not be public.
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struct hash_item_t {
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char* pString;
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unsigned short nNextElement;
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unsigned char nReferenceCount;
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unsigned char pad;
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};
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enum { INVALID_ELEMENT = 0, MAX_REFERENCE = 0xFF, HASH_TABLE_SIZE = 1024 };
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CUtlVector<unsigned short> m_HashTable; // Points to each element
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CUtlVector<hash_item_t> m_Elements;
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unsigned short m_FreeListStart;
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public:
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CCountedStringPool();
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virtual ~CCountedStringPool();
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void FreeAll();
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char* FindString(const char* pIntrinsic);
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char* ReferenceString(const char* pIntrinsic);
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void DereferenceString(const char* pIntrinsic);
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// These are only reliable if there are less than 64k strings in your string
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// pool
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unsigned short FindStringHandle(const char* pIntrinsic);
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unsigned short ReferenceStringHandle(const char* pIntrinsic);
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char* HandleToString(unsigned short handle);
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void SpewStrings();
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};
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#endif // STRINGPOOL_H
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