77 lines
1.5 KiB
C++
77 lines
1.5 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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//=============================================================================//
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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 "tier1/generichash.h"
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#include <unordered_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 eqstr {
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inline size_t operator()( const char *s ) const {
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if ( !s )
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return 0;
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return HashString( s );
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}
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inline bool operator()( const char *s1, const char *s2 ) const {
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return _stricmp( s1, s2 ) < 0;
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}
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};
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typedef std::unordered_map< const char *, CachedFileData *, eqstr, eqstr > Mapping;
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Mapping m_map;
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};
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#endif // #ifndef FILEMEMCACHE_H
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