69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
//====== Copyright c 1996-2007, 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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//=============================================================================//
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#ifndef FILEMEMCACHE_H
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#define FILEMEMCACHE_H
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#ifdef _WIN32
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#pragma once
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#endif
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#include "tier0/platform.h"
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#include "tier0/basetypes.h"
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#define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS
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#include <hash_map>
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#pragma warning ( disable : 4200 )
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class CachedFileData
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{
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friend class FileCache;
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protected: // Constructed by FileCache
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CachedFileData() {}
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static CachedFileData *Create( char const *szFilename );
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void Free( void );
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public:
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static CachedFileData *GetByDataPtr( void const *pvDataPtr );
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char const * GetFileName() const;
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void const * GetDataPtr() const;
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int GetDataLen() const;
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int UpdateRefCount( int iDeltaRefCount ) { return m_numRefs += iDeltaRefCount; }
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bool IsValid() const;
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protected:
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enum { eHeaderSize = 256 };
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char m_chFilename[256 - 12];
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int m_numRefs;
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int m_numDataBytes;
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int m_signature;
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unsigned char m_data[0]; // file data spans further
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};
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class FileCache
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{
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public:
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FileCache();
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~FileCache() { Clear(); }
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public:
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CachedFileData *Get( char const *szFilename );
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void Clear( void );
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protected:
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struct icmp { bool operator()( char const *x, char const *y ) const { return _stricmp( x, y ) < 0; } };
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typedef stdext::hash_map< char const *, CachedFileData *, stdext::hash_compare< char const *, icmp > > Mapping;
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Mapping m_map;
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};
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#endif // #ifndef FILEMEMCACHE_H
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